Future Science at JLab
Take a brief tour of the future science at Jefferson Lab with the 12 GeV Upgrade.
12 GeV Updates
11 December 2013
In-tunnel testing of the 12 GeV cryomodule known as C100-8 has resumed. Installation and final alignment is complete for the beamlines in the main "racetrack" of the accelerator, including closing locations used for access to the beam switchyard, injector, Hall D and southeast stub. Final vacuum hookup and alignment of the beamlines to Halls A, B and C are nearly complete. Final alignment of the Hall D beamline has been completed upstream of the shield wall/door at the top of the ramp. The arc 1 dipoles have been operated with the new arc 1 box supply. The arc 2 box supply is almost ready to connect to the dipole magnets. Box supplies for arcs 3 through 6, LAM1C, and the Hall A beamline are on site and in various stages of installation and testing. Delivery of the 20 Amp trim power supplies has resumed. The final procurements for the stripline beam position monitor electronics are about to go out. Installation of the Personnel Safety System for Hall D continues.
4 December 2013
Significant progress continues to be made as the 12 GeV Upgrade Project transitions from construction to pre-operations and commissioning of the accelerator. The first phase of the Accelerator Readiness Review (ARR) is complete, and the letter approving the start of accelerator commissioning has been received from the Thomas Jefferson Site Office. In the experimental halls, the new detectors are being assembled/upgraded and installed in both Halls B and D. In Hall C, the Super High Momentum Spectrometer carriage and detector hut are taking shape, and Hall A is preparing for the ARR Phase 2.
It is important to remain focused on safety as the remaining accelerator work is done. The lab has revisited the near-term schedule to ensure that the work load can be completed without jeopardizing safety. Everyone is reminded that safety is not a passive process, and all must actively evaluate the hazards of the tasks at hand. If there are any questions or concerns, always stop, assess, resolve and then move forward.
27 November 2013
The Hall D Barrel Calorimeter (BCAL) has been inserted into the solenoid magnet bore. The silicon photomultipliers that sense the light generated in BCAL have been mounted on the light guides, the light monitoring system built by the University of Athens has been added, and the electronics cabling and cooling piping added. The lead-glass Forward Calorimeter, which sits downstream of BCAL, has had its readout electronics added and its light-monitoring system installed, and it is being powered and tested. The Central Drift Chamber (CDC) has arrived at Jefferson Lab after having been constructed and receiving a full checkout at Carnegie Mellon University. It has been uncrated and tested, showing that no wires came loose during the trip. The Forward Drift Chamber has been assembled, moved to Hall D, surveyed, and is being prepared for installation by addition of its readout cabling. Florida State University has completed assembly of the time-of-flight wall to be located just upstream of the lead-glass calorimeter, and it has been delivered to Jefferson Lab. Preparation has started of the thinned diamonds that will serve as the bremsstrahlung target; scattered electrons from this target will be detected in the tagger hodoscope and tagger microscope, which in turn are being assembled by Catholic University and University of Connecticut staff, respectively. Installation of front-end electronics, data acquisition electronics, online computers and trigger electronics to render all the above equipment 'live' is proceeding apace, as is installation of needed infrastructure, such as cable race, racks, power transformers and distribution, chilled water distribution, and the gas distribution system. The tagger magnet is being readied for field mapping, as is the magnets for the pair spectrometer.
6 November 2013
In-tunnel testing of cryomodule C100-10 has been completed; testing of C100-08 is on hold, awaiting restoration of the South Linac to 2 Kelvin. Installation, including vacuum, diagnostics hookup and final alignment, is complete for the beamlines in the main "racetrack" of the accelerator with only some details of the vacuum system for the extraction region left to complete. Final alignment of the Transport Channel recombiner is underway. Beam pipes for the Hall A beamline are going in, and the dipole magnets for the Hall B beamline are installed. All of the radiofrequency construction work has been completed. High-power testing of the new box supply for arc 1 is complete. Installation of the new box supply for arc 2 is complete, and high-power testing is underway. The new box supplies for arc 4, arc 5 and the beamline to Hall A have arrived. The vendor for the box supplies is resolving a component problem with the higher-power units. During high-potential testing of the dipole magnets, a problem was identified with one of the YB septa in the east spreader needed for beam to Hall D; mitigation options have been developed and are being evaluated. The vendor for the 20 Amp trim supplies resolved its problem and was cleared to resume shipments after implementation of the corrections. The control system software scope has been completed; the scope for the Harps is complete as well. All of the 12 GeV cryogenics system scope was completed in September.
30 October 2013
The Accelerator Readiness Review (ARR) Phase 1B was completed on Oct. 24. The committee recommended that the lab seek approval to begin commissioning of the CEBAF accelerator upon the completion of the Hot Checkout process. The ARR process is an independent evaluation of the lab's readiness to begin commissioning. In the upcoming ARR Phases, the ARR committee will return to evaluate the lab's readiness as lab staff brings the experimental end stations online for commissioning. Up next is ARR Phase 2 Hall A, presently scheduled for the second quarter of FY14.
23 October 2013
The several parts for the Super High Momentum Spectrometer support carriage have been welded together into the final structure in Hall C. This has been followed by the start of construction of the concrete shield house on the carriage. The upgrade to the cryogenics infrastructure to accommodate the new spectrometer has begun. Welding of the helium vessel is underway for the Horizontal Bend (HB) dipole magnet, with one coil now “captive.” Manufacturing of parts for the nitrogen shield and support links for the HB is continuing, and parts for the vacuum vessel are ready. For the Q1 quadrupole magnet, the yoke quadrants and four coil assemblies have all been test-fit and some small adjustments have been made. Assembly is underway to form the cold mass for Q1, which will subsequently be inserted into the helium vessel, which will then be welded closed. The thermal shield is being fabricated, and the outer vacuum cryostat is ready. For the dipole magnet, the prototype winding is nearing completion, after which an epoxy-bonding test will be made. Very similar tooling and techniques will later be used to fabricate the Q2 and Q3 quadrupole magnets starting in the spring.
9 October 2013
In-tunnel testing of C100-9 has been completed, and testing of C100-10 has started. Installation, including vacuum, diagnostics hookup and final alignment, is essentially complete for the beamlines in the main "racetrack" of the accelerator. All radiofrequency construction work has been completed. High-power testing of the new box supply for arc 1 is complete. Installation of the new box supply for arc 2 is complete and high-power testing has started. The new box supplies for arc 5 and the beamline to Hall A have arrived. Testing of the new 4.5 Kelvin coldbox was completed as was construction and installation of the transfer line between it and the 2 K coldbox, thus completing all cryogenics scope.
2 October 2013
The Long Shutdown (LSD) phase of the 12 GeV Upgrade has come to a close. With this, the focus turns to the commissioning of the accelerator. Much of the activities will be centered on hot checkout of the components and subsystems needed to commission the accelerator and subsequently return to delivering beam. Hot checkout is a process whereby the functionality of required hardware and software is tested and signed off as being ready for beam operations. Accelerator Operations staff have developed a new tool to track the progress of the checkout/signoff process, which leverages lessons learned from previous machine shutdowns.
25 September 2013
The Office of Science Energy Systems Acquisition Advisory Board (ESAAB) met on Sept. 4 to review the Baseline Change Proposal for the 12 GeV CEBAF Upgrade Project. The ESAAB representatives recommended approval, and the formal approval document was signed by the Acquisition Executive. This action established a new baseline for the project with a completion date of September 2017.
18 September 2013
Hall B Update: The sixth and last sector of the PreShower Calorimeter for CLAS12 is assembled and has been tested extensively with cosmic rays. Members of the Old Dominion University group are readying the last Region 2 drift chamber for shipment to Jefferson Lab and also are steadily installing high voltage and readout electronics cards on other completed chambers stored at Jefferson Lab. The fifth and sixth (i.e. last) Region 1 chambers have been strung at Idaho State University and are now undergoing tension testing of all wires. The fifth Region 3 chamber is nearing the end of wire stringing at JLab. The first production module of the Silicon Vertex Tracker (SVT) barrel has been assembled and fully tested at Fermilab and passed with flying colors, and the second module's sensors are being attached to the next substrate. Series production of the SVT modules is thus underway at Fermilab.
The machined parts for the containment vessel for the High Threshold Cerenkov Counter (HTCC) have arrived and been assembled, and the carbon-fiber entry dish and related parts are nearing completion. The mirror assembly jig for the full main mirror for HTCC is also ready. All the Forward Time-of-Flight (TOF) 1-b slats built at the University of South Carolina have been mounted to their support arrays and are undergoing system tests as a group in a rack using cosmic rays. The second set of arrays of existing TOF slat arrays from CLAS has been refurbished, and the mirror refurbishment has been started for the existing Cerenkov Counter.
The first prototype double-pancake winding for the Torus magnet prototype coil is complete at Fermilab and is being readied for epoxy potting. Major parts orders for the Torus are being issued, with the first coil cases having just arrived at Fermilab. The first fixtures for the Torus cryostat factory are assembled and being readied for use. The design revisions from the vendor have arrived for the intermediate design review for the Solenoid magnet, with work continuing on thermal and structural analysis at Jefferson Lab and in collaboration with Brookhaven National Lab. Soldering of the superconducting cable to the copper stabilizer for these two magnets has reached the seventh reel for the Torus and will be shifted over to that for the Solenoid once a buffing operation to prepare the copper surfaces for epoxy bonding is completed for the Torus.
11 September 2013
The Super High Momentum Spectrometer support carriage and shield house assembly is progressing in Hall C. The SHMS support carriage steel structure is complete, and forming for the concrete shield house has started. The site safety plan has been approved, and the Preliminary Hazard Analysis has been performed by the subcontractor. Due to the unique nature of the proprietary concrete mixture, some of the batching will be performed on site. The vendor responsible for mixing the concrete is setting up to verify the exposure control plan through off-site air monitoring prior to batching. Jefferson Lab’s Industrial Hygiene and 12 GeV Safety Manager will monitor the process.
28 August 2013
In-tunnel testing of C100-9 is nearing completion, and testing of C100-10 is starting. Installation, including vacuum, diagnostics hookup and final alignment, is nearing completion for the beamlines in the main “racetrack” of the accelerator; leak checking for the vacuum system in the west recombiner is underway, and the last few pieces of beam tube are being installed in the west spreader. Completion of the beamlines is now focused on the extraction section, where alignment for hookup of the magnets and separator cavities is complete, and vacuum installation is underway. The radiofrequency waveguide circulator repairs are complete, and installation in the four zones in the south linac has begun. The in-place testing of the new box supply for arc 1 is nearing completion. Installation of the new box supply for arc 2 has begun. The new box supply for the beamline to Hall A will be shipped to Jefferson Lab this week. Retesting of the 4.5 Kelvin coldbox was delayed until Aug. 27, while some problems with the controls were resolved.
21 August 2013
The final light guides for the Hall D Barrel Calorimeter (BCAL) have been attached to the calorimeter modules, which in turn have been stacked, all but the last two, into the cylindrical arch shape prior to insertion into the solenoid magnet bore. The light monitoring system for BCAL, built by the University of Athens, is being added as the BCAL sectors are readied. The silicon photomultipliers that sense the light generated in BCAL will be mounted on the light guides using the custom mechanics and cooling structure, once BCAL is inserted into the solenoid magnet bore. The lead-glass Forward Calorimeter, which sits downstream of BCAL, has been stacked into its support frame and is having its readout electronics added. The Central Drift Chamber has had a full checkout at Carnegie Mellon University prior to shipping to Jefferson Lab. The four stations of the Forward Drift Chamber have been assembled onto their support frame and are being readied for cabling. Florida State University continues assembling the time-of-flight wall to be located just upstream of the lead-glass Forward Calorimeter. Preparation has started of the thinned diamonds that will serve as the bremsstrahlung target; scattered electrons from this target will be detected in the tagger hodoscope and tagger microscope, which are being assembled by Catholic University and University of Connecticut staff, respectively. Installation of front-end electronics, data acquisition electronics, online computers and trigger electronics to render all the above equipment 'live' is proceeding apace. The solenoid magnet has been re-cooled to liquid helium temperatures and mapped at the planned operating current of 1300 Amps. It has since been warmed up to carry out some planned repairs to its refrigerator.
7 August 2013
12 GeV Upgrade & Environment, Safety, Health and Quality: Starting on Aug. 19 and lasting for four days, 15 visiting professionals will be at Jefferson Lab conducting an Accelerator Readiness Review (ARR) in preparation to commission and ultimately to resume CEBAF operations. After the Long Shutdown and enhancements, Jefferson Lab needs to demonstrate it can safely and effectively manage the upgraded accelerator before the DOE Site Office will authorize commissioning activities.
Various groups associated with the ARR will have talks, document reviews, in-the-field verifications and demonstrations of lab systems and personnel readiness. The Jefferson Lab ARR effort, lead by ESH&Q, has been preparing documents and assembling subject matter experts to provide answers to the reviewers. The pre-Hot Checkout reviews, conducted by a team of Accelerator Division staff, are key to both identifying readiness issues and preparing for the ARR. The visiting reviewers, all experienced accelerator professionals in their respective fields, will be conducting concurrent sessions for various topics lasting several hours each day.
If you are asked to participate or provide assistance to the ARR effort, it's because your support is needed to demonstrate Jefferson Lab's high level of professional competence to commission and run the accelerator.
31 July 2013
In-tunnel testing of cryomodule C100-6 has been completed; the total voltage for that cryomodule was 108 Megavolts. Final alignment is complete for the east recombiner, the 0L0R area, and the west arcs. All components are in place in the east spreader and west recombiner. The new coils for the Lambertson magnet have arrived. Assembly of the new radiofrequency separator cavities is complete. Fabrication of the Personnel Safety System beam stoppers/diffusers continues. Procurement of all electronics for the Hall D tagger beam dump is complete. A total of 120 of the new 20 Amp trim supplies are now on site; 60 of the units have been installed. The new box supply for arc 1 has been delivered; vendor testing of the new box supply for arc 2 has been completed, and the unit has been prepped for shipment to Jefferson Lab.
17 July 2013
Welding of the helium vessel is underway for the Hall C Super High Momentum Spectrometer horizontal bend magnet; the manufacturing of parts for the liquid nitrogen shield and support links has begun; and parts for the vacuum vessel have arrived. The stacking and welding of the steel laminations that form the yoke for the Q1 quadrupole magnet is complete. The Q1 yoke was subsequently separated into four quadrants, and the coils were test fit. Installation of the yoke and coil assembly into the helium vessel is next. The tooling has been readied for coil winding and epoxy impregnation of the dipole magnet. Production consolidation of the conductor for the coil is underway, as well as preparation for the final prototype winding. Parts for the SHMS support carriage have been moved into Hall C. Final machining is complete for the hundred tons of magnet steel yokes for the dipole and for the Q2 and Q3 magnets. Detector construction continues, with drift chamber stringing progressing at Hampton University and the shipment of the vessel for the Heavy Gas Cerenkov Counter.
10 July 2013
Work is well underway in both the North and South Linac Service buildings to provide additional cooling capability. In Hall C, assembly of the support structure for the new Super High Momentum Spectrometer has also begun. Note that new construction work areas have been established, which will require additional Personal Protective Equipment for entry, and access will be restricted to those having a need to be there.
26 June 2013
The tenth and final C100 cryomodule has been installed in the tunnel. In-tunnel testing of C100-7 has been completed; the total voltage for that cryomodule was 108 Megavolts. In-tunnel testing of C100-6 is underway. All of the dipoles and 90 percent of the girders have been installed in the beamline to the Hall D tagger enclosure. The extraction chicane dipoles have been installed. Final alignment of the east arcs is complete and is nearly complete for the west arcs. Installation of the west recombiner and transport channel recombiner are nearly complete; the east spreader is complete except for two septa. The east recombiner is under vacuum. Assembly of the new radiofrequency separator cavities is underway. Fabrication of the Personnel Safety System beam stoppers/diffusers has begun; the associated electronics are on order. Seventy-five of the new 20A trim supplies are now on site; thirty of the units have been installed. Vendor testing of the new box supply for arc 1 is nearly complete; testing of the new supply for the beamline to Hall A has begun. Procurement of the electronics for the new stripline beam position monitors continues.
19 June 2013
Significant progress is being made on the assembly and testing of CLAS12 detectors. The sixth and last sector of the PreShower Calorimeter for CLAS12 is stacked and is being readied for testing with cosmic rays. Members of the Old Dominion University group have finished stringing the Region 2 drift chambers and now are installing high-voltage and readout electronics cards on other completed chambers. The fifth and sixth (last) Region 1 chambers are being strung at Idaho State University, and the fifth Region 3 chamber continues being strung at Jefferson Lab. The first full modules of the Silicon Vertex Tracker barrel have been fully tested at Fermi National Accelerator Laboratory and exhibit better noise performance than required. Preparations are underway for the SVT manufacturing readiness review to be held in late June at Fermilab. The parts for the containment vessel for the High Threshold Cerenkov Counter (HTCC) have arrived. Assembly of the Forward Time-of-Flight FTOF 1-b slats is complete at the University of South Carolina. The second set of arrays of existing TOF slat arrays from CLAS are being refurbished, with a parallel effort underway for the sectors of the existing Cerenkov Counter. Test windings for the CLAS12 Torus prototype coil have begun at Fermilab, and the main design for the torus magnet continues at Jefferson Lab, with initial parts for the magnet and first fixturing for the magnet cryostat factory now on order. The design submissions from the solenoid magnet vendor have arrived in support of the intermediate design review scheduled for next week. Work continues on the thermal and structural analysis of the solenoid at Jefferson Lab and in collaboration with Brookhaven National Lab. Soldering of the superconducting cable to the copper stabilizer for these two magnets has reached the fifth reel for the torus magnet.
12 June 2013
The Accelerator Readiness Review (ARR) team has been identified and chartered. The ARR team will include both internal and external reviewers. The ARR process evaluates the readiness of the people, procedures and equipment to safely carry out the commissioning and routine operation of the accelerator. The ARR for the 12 GeV upgrade will be a phased process, starting with the commissioning of the accelerator as we usher in the 12 GeV era. The first review module is tentatively scheduled for August 2013.
5 June 2013
Acceptance testing of the tenth and final C100 cryomodule in the Cryomodule Test Facility has been completed. In-tunnel checkout of C100-3 has been completed and checkout of C100-7 has begun. A major event for the new 4 Kelvin helium plant was recently achieved by producing 4500 liters/hour of liquefaction; this was a contract deliverable performance criterion for the vendor. Testing into shorts has been completed on zone 23 in the North Linac, and testing has begun on zone 25. The installation/re-assembly of the east spreader is lacking only the YB septa magnet, the drift tubes, and some low-conductivity water tubing. The pedestals for the 4-meter dipole magnets in the beamline to Hall D have been installed. Forty of the new 10A trim supplies have been received and another 20 are in transit from the vendor. The new box supply for the arc 1 dipole magnet string is being tested at the vendor's facility. Plating of the new radiofrequency separator cavities has been completed. All 12 GeV project work for the control system hardware has been completed.
29 May 2013
All light guides for the Hall D Barrel Calorimeter (BCAL) have arrived from the University of Santa Maria, and more than two-thirds have been attached to modules. The BCAL light monitoring system, built by the University of Athens, is being added. The lead-glass calorimeter, FCAL, was stacked into its support frame by Indiana University. The Central Drift Chamber is undergoing a full checkout at Carnegie Mellon University prior to shipping to Jefferson Lab. The fourth (last) package of the companion planar drift chambers is being tested at Jefferson Lab. The production F1TDC modules are being tested at the University of Massachusetts. The first articles of the FADC-125 modules arrived and were successfully tested, and full production is now underway. Florida State University continues assembling the Time-of-Flight wall. The tagger magnet is now assembled in the tagger area. The University of Connecticut and The Catholic University of America, respectively, continue with assembling the tagger microscope and hodoscope, which are the detectors for the tagger region. The solenoid magnet has been cooled and tested to full current of 1500 Amps. It experienced a quench on May 1 and is now being re-cooled for final tests and mapping.
15 May 2013
At the request of DOE's Office of Nuclear Physics, Daniel Lehman, director of the Office of Project Assessment in DOE's Office of Science, convened a team of 20 experts and 14 observers in an Independent Project Review of the 12 GeV CEBAF Upgrade Project at Jefferson Lab on May 7-9. The purpose of the review was to assess all aspects of the project as it re-establishes the DOE Performance Baseline due to a directed change that reduced the FY12 congressional appropriation. The review team concluded that the project is ready to move forward with the proposed re-baseline following implementation of review recommendations.
1 May 2013
Detector construction for the Hall C Super High Momentum Spectrometer continues, with drift chamber stringing progressing at Hampton University and the vessel readied for the heavy gas Cerenkov counter. For the HB dipole magnet, machining of the helium vessel is underway, and the designs of the liquid nitrogen (LN2) shield and vacuum vessel are in final check. The stacking and welding of the steel laminations that form the yoke for the Q1 quadrupole magnet has passed the halfway point. Tests of the epoxy impregnation method to be used for the coils of the dipole, Q2 and Q3 magnets have been completed; production of the automated tooling to consolidate the conductor into its final form is underway; and a first test winding of the dipole magnet using the final conductor was done. Installation of the rails for the SHMS support carriage is complete, and an award of the main contract to assemble the support carriage is being prepared. Final machining is complete for the hundred tons of magnet steel yokes.
Work will begin soon in both the North and South Linac Service buildings to add additional cooling capability. When this work commences, new construction work areas will be established. The work areas will be under the control of the contractor and will require additional PPE for entry. As with any construction area, access will be restricted to those having a specific need to be there. The work permit will be posted and will list the SOTR responsible for coordinating activities in the designated construction area.
17 April 2013
Assembly of the 10th and final C100 cryomodule has been completed. Acceptance testing of the 9th C100 is underway in the Test Lab. The linacs have been taken to 2 Kelvin, and testing of C100 cryomodules in the tunnel has resumed in the North Linac. The production run for the new trim supplies has started. Commissioning of the new 4.5 K coldbox for the Central Helium Liquefier #2 is underway in collaboration with the vendor. Installation is underway for the 10 large BCOM dipole magnets in the spreaders and recombiners. Procurement of the electronics for the stripline beam position monitors has started.
Pursuant to a recommendation in the Final Report concluding the DOE Independent Project Review (IPR) of the 12 GeV CEBAF Upgrade Project held in November 2012, a Director's Re-Baseline Review of the 12 GeV Upgrade Project was convened at JLab April 8-10. A team of 11 experts and one observer, led by Edward Temple, Jr., reviewed the status of the multiple, superconducting magnet sub-projects and the completeness and defensibility of all components of the project's Estimate to Complete. The review helped identify areas of the re-baseline proposal in need of improvement in preparation for the next DOE IPR of the 12 GeV CEBAF Upgrade Project scheduled for May 7-9 at JLab.
27 March 2013
Spring is the beginning of many things. In the 12 GeV Upgrade Project, spring is evident by the many changes that have and will continue to occur. In Hall B, the space-frame modification is underway; Hall C has seen the installation of the new Super High Momentum Spectrometer rail with the assembly of the SHMS structure out for bid; and the Hall D Tagger area landscape continues to change with the installation of girder stands and magnet assembly. As the accelerator upgrades near completion, the Accelerator Readiness Review (ARR) process is getting ready to kick off with the summer Director's Review of the Integrated Commissioning Plan. The ARR process is designed to verify that the programs, people and equipment are in place to safely commission and perform routine operation of the accelerator.
20 March 2013
The fifth sector of the PreShower Calorimeter for CLAS12 is complete and is being tested with cosmic rays. Stacking of lead sheets and scintillator bars threaded with wavelength shifting fibers has started for the sixth and last sector. The sixth and last wire chamber sector for Region 2 has been tested at Old Dominion University, and members of that group are installing high-voltage and readout electronics cards on other completed chambers stored at JLab. The third and fourth Region 1 chambers are being tested at Idaho State University, and the second pair of Region 3 chambers continues being strung at JLab. The mirror substrates for the High Threshold Cerenkov counter are being given their reflective coatings. Assembly of the Forward-Time-Of-Flight (FTOF) 1-b slats has passed the three-quarters point at University of South Carolina. Refurbishment of the existing TOF slat arrays from CLAS continues, with a parallel effort underway for the sectors of the existing Cerenkov Counter. Construction of tooling for winding the Torus prototype coil continues at Fermilab, and the main design for the Torus magnet continues at JLab. The preliminary design review for the Solenoid magnet was held in February, with work continuing on thermal and structural analysis. Production soldering of the superconducting cable to the copper stabilizer for these two magnets has started.
13 March 2013
Conventional facilities construction for the 12 GeV Upgrade will resume with the award of a construction contract to upgrade the air conditioning systems in the North and South Linac Service Buildings. Approximately 30 tons of cooling will be added to each service building to handle the heat load from the new 12 GeV radiofrequency zones. The vendor site visit was held on March 12; vendor proposals are due March 28.
27 February 2013
Assembly of the tenth (of 10) C100 cryomodule continues. Acceptance testing of the sixth C100 was completed in the Test Lab, and it has been moved to the tunnel. Work on the new radiofrequency zones continues. Connections of the power supplies to the quadrupole and corrector dipole magnets is ongoing in the east arc beamlines, west recombiner and east spreader regions. Installation of girders and dipole magnets for the west recombiner continues, along with stands for the transport channel recombiner. Magnet cable pulls are complete in the east arcs and nearly complete in the west arcs. Preparation continues for the commissioning of the 4.5 Kelvin coldbox for the Central Helium Liquefier-2 (CHL2) next month. All five of the new warm compressors for CHL2 have been operated successfully. The Hall D refrigerator has been cooled to 4 K. Assembly continues of the cryogenics transfer line that will connect CHL2 to the linacs. Installation of the pedestals for the beamline to Hall D has started. Removal of the beamlines to Halls A, B and C is underway. A final functional review of the new beam position monitor (BPM) electronics was held.
13 February 2013
Progress continues on the detector and tagger equipment for Hall D. Some 90 percent of the light guides for the Hall D Barrel Calorimeter have arrived from the University of Santa Maria and are being attached to the calorimeter modules. The full shipment of the light monitoring system that goes with them arrived from the University of Athens. The lead-glass calorimeter is being stacked into its support frame by a group from Indiana University. The Central Drift Chamber is having the gas manifold added at Carnegie Mellon University prior to undergoing full checkout. The fourth package of the planar drift chambers is being assembled. The production FADC-250 modules for reading out the two calorimeters are complete, and more than 90 percent have been tested at the University of Massachusetts. The first articles of the FADC-125 modules have arrived, as have the first F1TDC modules. Florida State University has begun assembling the Time-of-Flight wall. The tagger magnet has been delivered and is being assembled. The cool-down of the solenoid magnet has started, with the magnet now at liquid nitrogen temperature. Further cooling to liquid helium temperature awaits completion of some work on the cryogenics compressors.
6 February 2013
Assembly of the ninth C100 cryomodule is complete, assembly of the 10th is progressing, and acceptance testing of the sixth C100 continues in the Test Lab. Work on the new radiofrequency zones continues. Connections of the power supplies to the quadrupole and corrector dipole magnets is underway in the east arc beamlines. Preparation of the 4.5 Kelvin coldbox for the Central Helium Liquefier-2 continues for February commissioning, and assembly is underway of the transfer line that will connect CHL2 to the linacs. Re-installation of the east spreader and east recombiner is complete except for the BCOM dipoles (magnets at the linac-end of the segment with multiple beams passing through them); installation of girders and dipoles for the west recombiner is underway. The first reworked BCOM dipole has been tested and has met specifications. The first 3-meter-long ZA septum magnet is installed; the fourth ZA has been received. The Personnel Safety System for the North Linac achieved certification. A final functional review of the new beam position monitor electronics is scheduled for next week.
30 January 2013
12 GeV-related installation activities have increased in all the experimental halls. With much of the required disassembly of base equipment completed, the landscape in the halls has changed. With these changes comes a need to increase safety awareness when working in these facilities. One of the best ways to increase your awareness is to perform an onsite, pre-task walk-through to become familiar with any infrastructure changes that could pose a potential risk.
16 January 2013
Detector construction for the Hall C Super High Momentum Spectrometer continues, with drift chamber stringing progressing at Hampton University and a design readied for the noble gas Cerenkov counter. Machining of the helium vessel has started for the horizontal bend dipole magnet, and the design detailing of the liquid nitrogen shield and vacuum vessel is underway. The machining and water-jet cutting of the steel laminations for the Q1 quadrupole magnet is continuing, with the last steel parts being delivered. Soldering of the copper stabilizer to the superconducting SSC cable for the Q2, Q3 and dipole magnets is complete. Tests of the epoxy impregnation method to be used for the coils of the dipole, Q2 and Q3 magnets were made and production of tooling for this has begun. Installation of the rails for the SHMS support carriage has started, and bids for the main contract to assemble the support carriage are in hand. The needed quantities of boron carbide and plastic flakes for the specialized concrete for the shield house are arriving. Final machining is 40 percent complete for the several hundred tons of Q2, Q3 and dipole magnet steel yokes.
9 January 2013
Assembly of the ninth and tenth (of 10) C100 cryomodules continues. Acceptance testing of the sixth C100 is underway in the Test Lab. Work on the new radiofrequency zones continues. Eight of the new high-power RF circulators were received. The new cryogenics systems for Hall D are being used to cool down the solenoid magnet. The 4.5K coldbox for the Central Helium Liquefier 2 is being prepared for commissioning next month. Assembly is underway of the cryogenics transfer line that will connect CHL2 to the linacs. Re-installation of the east spreader is nearly complete; the stands for the west spreader have been installed. Field mapping of the first three-meter-long ZA septum magnet is complete, and it met the specifications; it has been readied for installation. The second ZA septum magnet has been received. All of the new vertical stands for the beam transport system have been received. All Instrumentation & Controls/Safety systems were ready on schedule for the Hall D solenoid cooldown and linac cooldown. The Personnel Safety System is ready for certification next week.
