Future Science at JLab
Take a brief tour of the future science at Jefferson Lab with the 12 GeV Upgrade.
12 GeV Updates
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.
