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12 GeV Updates

19 December 2012

As work activities related to the 12 GeV Upgrade Project pick up in the experimental halls, personnel need to be aware of changing conditions. For example, the upcoming cooldown of the large solenoid magnet in Hall D will result in changes to the Oxygen Deficiency Hazard (ODH) ratings in Buildings 200, 203 and 204. An email notification of this change was sent out to alert all employees. Personnel need to ensure that they review all current postings, even if they are entering a familiar area, and comply with their instructions.

12 December 2012

Progress continues on the detector construction for the Hall B CLAS12 spectrometer. The fourth sector of the preshower calorimeter is complete, and the stacking of lead sheets and scintillator bars threaded with wavelength-shifting fibers is half-completed for the fifth sector. The sixth and last wire chamber sector for Region 2 has been completed at Old Dominion University, the third and fourth Region 1 chambers have been strung at Idaho State University, and the second pair of Region 3 chambers is being strung at JLab. Most of the approximately one dozen items of tooling for assembling the modules of the silicon vertex tracker barrel have been built and sent to Fermilab, where the sensor modules will be put together and wire-bonded. All the mirror substrates are built for the high threshold Cerenkov counter. Assembly of the forward time-of-flight 1-b slats has passed the half-way point at the University of South Carolina. Construction of tooling for winding the prototype coil for the torus magnet has started at Fermilab. The contract for the solenoid magnet has been awarded, with a vendor meeting set for late December.

5 December 2012

Assembly of the ninth C100 cryomodule is nearing completion. Assembly of the tenth and final C100 cryomodule is well underway. Work on the new radiofrequency zones is going well: testing into shorts has started for the fifth new zone and installation of the sixth and seventh zones is underway. The cryogenics systems for Hall D solenoid is nearing completion and is on track for the start of solenoid cooldown in mid-December. Re-installation of the east recombiner is nearly complete. Fifty-nine of the 65 one-meter spreader/recombiner dipole magnets have been re-worked. All magnets continue to meet specifications. Field mapping of the first three-meter long ZA septum is underway; the second ZA magnet has been received. All Instrumentation & Controls/Safety Systems will be ready on schedule for Hall D solenoid cooldown and linac cooldown.

21 November 2012

At the request of the Office of Nuclear Physics, Daniel Lehman, Director of the Office of Project Assessment in DOE's Office of Science, will convene a team of 22 experts plus 10 observers in an Independent Project Review of the 12 GeV CEBAF Upgrade Project to be held at JLab on Nov. 27-29. The purpose of the review is to assess all aspects of the project in order to re-establish the DOE Performance Baseline resulting from a $16 million reduction in FY12 congressional appropriation.

October 31, 2012

Great progress continues in Hall D. The vendor for the tagger magnet has completed epoxy-potting and testing the 12 coil packs and plans to ship by the end of the year. The large valve box that distributes helium and nitrogen to the solenoid magnet has been installed, and the lengthy process of adding superinsulation and connecting the hundreds of instrumentation wires has begun. The start of magnet cooldown is planned for December.

Many institutions are contributing to the detector systems in Hall D. The first batches of light guides for the Hall D barrel calorimeter have arrived from the University of Santa Maria in Chile. The silicon photomultipliers have been manufactured and will be mounted on the light guides. The first shipment of a related light-monitoring system has arrived from the University of Athens. Indiana University is checking the final photomultiplier tubes for the lead glass forward calorimeter. The central drift chamber is having the last electronics hook-ups added at Carnegie Mellon University. About half of the FADC-250 modules for reading out the two calorimeters are being tested at the University of Massachusetts. The FADC-125 modules needed for the drift chambers have begun fabrication, as have the F1TDC modules. Finally, Florida State University has begun work on the time-of-flight wall located just upstream of the lead-glass calorimeter.

October 24, 2012

The eighth C100 cryomodule has been completed; assembly of the coldmass for the tenth and final C100 has begun. The fourth and fifth C100s have been put in place in the tunnel. Re-installation of all the arc dipole magnets has been completed and hook-up of the vacuum lines is underway. Re-installation of the east recombiner is nearly complete. Installation of the east spreader and the reworked injector beamline is underway. Installation of the new radiofrequency systems for the new cryomodules has re-started after a period of inactivity due to the reduced FY12 funding. Installation of the moveable shielding wall at the downstream end of the tunnel to the Hall D tagger enclosure is nearing completion. Oxygen Deficiency Hazard system installation for Hall D continues. Installation of the refrigerator and transfer line for the Hall D solenoid is on schedule.

October 17, 2012

The 12 GeV Project Team and the JLab ESH&Q Division continue to make preparations for the Accelerator Readiness Review (ARR). The draft of the Final Safety Assessment Document (FSAD) was submitted to the Thomas Jefferson Site Office for review and all resulting comments have been reconciled. The updated FSAD will be submitted to the Site Office Manager by the end of the month for approval. The membership of the ARR review committee is being developed.

October 10, 2012

Construction of the five magnets for the Hall C Super High Momentum Spectrometer (SHMS) continues. Procurement of cold mass parts for the small horizontal bend dipole magnet has started in preparation for assembly of the finished coils. Winding of the fourth and last coil for the Q1 quadrupole magnet is complete, and preparation of magnet laminations is continuing. Soldering of the copper stabilizer to the superconducting SSC cable for the Q2, Q3 and dipole magnets is nearly complete. Production winding tooling for the dipole magnet has been assembled and used to wind a 1-meter prototype of the innermost dipole coil. The wheels and bogies for the support structure are being assembled and checked at the factory before shipment, and tenders for the assembly contract for the support structure are being readied. The several hundred tons of steel yokes for the Q2, Q3 and dipole magnets have been completed and shipped from the vendor and will arrive in about a month.

September 26, 2012

Excellent progress continues to be made on the rebuild of beamlines:

Installation of stripline beam position monitors has begun in arc 10. Installation of the Oxygen Deficiency Hazard (ODH) system for Hall D has started. Cabling is being placed for the arc 10 harps, viewers and vacuum. Assembly of C100 cryomodules continues. The final klystron has been received. The contract on the warm helium compressors for the Central Helium Liquefier-2 has been closed out. The contract for the 4.5K coldbox for CHL2 is nearly closed out. Work has accelerated on the Hall D refrigerator and the transfer line that connects it to the Hall D solenoid.

September 19, 2012

The 12 GeV long-term installation activities are coordinated through monthly progressing and weekly planning meetings of the Long Shutdown team. Integration of the 12 GeV Hall B and Hall C installation schedules is planned for the upcoming months. Monthly meetings with Facilities Management & Logistics continue to ensure coordination and support for 12 GeV facility-supported activities. Installation activities at Hall D continue to increase and are coordinated through the Hall D work coordinator.

September 12, 2012

The 12 GeV long-term installation activities are coordinated through monthly progressing and weekly planning meetings of the Long Shutdown team. Integration of the 12 GeV Hall B and Hall C installation schedules is planned for the upcoming months. Monthly meetings with Facilities Management & Logistics continue to ensure coordination and support for 12 GeV facility-supported activities. Installation activities at Hall D continue to increase and are coordinated through the Hall D work coordinator.

September 19, 2012

The third sector of the PreShower Calorimeter for CLAS12 is complete and has been tested successfully with cosmic rays. The sixth wire chamber sector for Region 2 has been started at Old Dominion University, the third and fourth Region 1 chambers are being strung at Idaho State University, and the first two Region 3 chambers have been strung at JLab. High-voltage and readout boards are being added to the strung sectors and cosmic ray testing is underway.

The first items of tooling for assembling the Silicon Vertex Tracker were built and sent to Fermilab, where the sensor modules will be put together. The last of five types of mirror substrates are being built for the high threshold Cerenkov counter. Assembly of the forward time-of-flight 1-b slats has reached the half-way point at the University of South Carolina. The existing time-of-flight slat arrays are being removed from CLAS and checked prior to refurbishment, as are the sectors of the existing Cerenkov counter.

Analyses of the cold masses, which includes the coils and their cases, continued for the torus magnet. Bids for the solenoid magnet have been received from commercial vendors and are being evaluated.

August 28, 2012

Assembly of C100 cryomodules continues. Excellent progress continues to be made on the rebuild of the beamlines; installation of the new configuration has begun. All stands have been installed in the East Recombiner. Initial installation of the moveable shield wall in the tunnel to the Hall D tagger has begun. Work by the vendors of the compressors and coldbox for Central Helium Liquefier-2 is nearly complete.

August 15, 2012

Accelerator Readiness Review
Preparations are underway for an Accelerator Readiness Review. The purpose of the review is to ensure that the new facility is poised to safely commission and operate. This process starts with the development of a Safety Assessment Document. JLab is updating Revision 7 of the Final Safety Assessment Document (FSAD), which will incorporate changes to the facility resulting from the 12 GeV Upgrade project. Development of this draft document is on track to be released for review by the end of August.

August 8, 2012

The fit-out of the Hall D complex with services and beamline items continues, with the cryogenics and solenoid magnet service module progressing well. The tagger magnet coils are being insulated and tested, with delivery expected in late summer. Wiring of the end-caps for the straw tubes for the Central Drift Chamber is well underway at Carnegie Mellon University. Construction of the fourth Forward Drift Chamber package (of four total) is underway onsite. The final Cockcroft-Walton high-voltage bases for the Forward Calorimeter are being assembled at Indiana University. The various readout boards for the Barrel Calorimeter are under production. Electronics procurements continue with the manufacturing contract awarded for several hundred FADC-125 read-out modules, and the contract for the F1TDCs is out for bid.

August 1, 2012

There are now four operational 12 GeV cryomodules plus associated new radiofrequency zones installed in CEBAF. In-tunnel checkout of the fourth cryomodule (C100-4) has been completed, and it was operated at 106 Megavolts. Assembly of the remaining six C100 cryomodules has resumed in the new work area in the Test Lab Addition. The vendors for the major components of the new refrigerator, the Central Helium Liquefier-2, continue their on-site installation work. Excellent progress is being made on the rework of the beamlines, including completion of nearly 50 percent of the total required machining on the re-used dipole magnets.

July 25, 2012

The 12 GeV team has integrated the installation plans into the lab-wide integrated schedule, and monthly progressing to update the schedule has started. The 12 GeV team continues to participate in "Long Shutdown" planning team to coordinate 12 GeV installation activities. As installation activities increase in the completed conventional facilities, weekly meetings with Facilities Management and Logistics ensure coordination and support. The team has finalized all transportation, material handling equipment, space, storage and waste/recycle needs. Evaluation of needs will continue throughout the shutdown. Installation activities at Hall D are increasing and are being coordinated through the Hall D work coordinator.

July 18, 2012

Detector construction for the Hall C Super High Momentum Spectrometer continues, with preparations started to aluminize and overcoat the mirror blanks for the heavy-gas Cerenkov counter. Winding of the third coil for the Q1 quadrupole magnet is complete. Soldering of the copper stabilizer to the superconducting SSC cable for the Q2, Q3 and dipole magnets continues, with the second major shipment of soldered production conductor having arrived at the magnet vendor. Production winding tooling for the dipole magnet is arriving at the vendor and being assembled. The sections of the support structure have arrived at JLab and are stored pending their move to Hall C after removal of Q-weak and the Short Orbit Spectrometer is complete. The first sections of the several hundred tons of Q2, Q3 and dipole magnet steel yokes have been cast and readied for final machining.

July 11, 2012

The new SL23 zone (C100-5 cryomodule and new radiofrequency system) has been operated at 109 Megavolts in the linac; a full test with beam loading will be done later. Testing of the latest new zone (C100-4 and associated new RF) has begun. Deliveries of new klystrons now exceed the 80 needed for the 12 GeV installations. Removal of the beamlines from the tunnel is making good progress: the east and west recombiners and the west spreader have been removed; removal of the east spreader is underway. The first fully reworked spreader/recombiner dipole magnet, which included modification to the iron core, has been tested; field measurements were within specifications, giving further validation to the design model used for these complicated magnets. All M15 and M20 beam position monitors are ready for installation on the new beamline girders. Progress on the Hall D 4.5 Kelvin refrigerator continues, with installation of the pan legs and nitrogen separator. The vendors for the major components of the Central Helium Liquefier-2 4.5 K plant are on-site completing their work, including installing the very large transfer line for the coldbox. All of the high-voltage power supplies for the beamline ion pumps have been received.

June 27, 2012

With the Long Shutdown in full swing, many employees have been assigned to other organizations to provide needed resource support. Although the work is often similar, the work environment could be different. These differences increase the potential for human error. Many management tools can be used to minimize this risk, such as interactive pre-job briefs, mentoring, maintaining a questioning attitude, repeat-back style of communication, review of training requirements, and frequent first-line supervision interaction. Consult with Dr. Chandler to assure "new" work assignments for employees are safe and appropriate.

June 20, 2012

The second sector of the PreShower Calorimeter for Hall B's CLAS12 is complete and has been tested successfully with cosmic rays. Stacking of lead sheets and scintillator bars threaded with wavelength-shifting fibers is complete for the third sector and is being readied for the fourth. The third and fourth Region 1 wire chambers are being strung at Idaho State University; the fifth Region 2 chamber is complete at Old Dominion University, and the first two Region 3 chambers are being strung at JLab. High-voltage and readout boards are being added to sectors that are strung, and cosmic ray testing is underway. The first complete module of the Silicon Vertex Tracker was tested in CLAS during the recent accelerator run, and the flex-cables and support staves with all recent improvements are being manufactured. The last two of five types of mirror substrates are being built for the high threshold Cerenkov counter. Delivery of the final orders of photomultiplier tubes and scintillator material to the University of South Carolina has begun, where assembly of the forward time-of-flight 1-b slats is progressing well. An agreement was signed with FermiLab to produce the six large cold masses with the coils for the torus magnet.

June 13, 2012

The full research performance goal of the C100 cryomodules has been successfully demonstrated: 108 Megavolts while accelerating 465 μA (microamps) for more than one hour. The major installation work is well underway. The east recombiner has been removed and the removal of the west spreader has begun. Two new cryomodules (C100-4 and C100-5) have been installed. More than ten trim power supply racks have been installed. Installation of the compressors and 4.5 Kelvin coldbox for the Central Helium Liquefier-2 continues. The beam position monitors for arc 10 are ready for installation.

June 6, 2012

The installation plans of the 12 GeV Upgrade team have been integrated into the lab-wide integrated schedule for the long shutdown, and monthly progressing has started. As installation activities increase in the completed conventional facilities, weekly meetings with Facilities Management and Logistics ensure coordination and support. The 12 GeV Upgrade project has finalized all transportation, material handling equipment, space, storage and waste/recycle needs. Evaluation of needs will be updated throughout the shutdown.

May 23, 2012

The Hall D complex is being equipped with services and beamline items, including the pair spectrometer magnet and collimator system. The tagger magnet coils and steel cores are under production, with delivery expected in late summer. Wire-stringing of the straw tubes for the Central Drift Chamber (CDC) has been completed at Carnegie Mellon University. The third chamber package (of four total) is being built for the Forward Drift Chamber (FDC). The manufacturing contract for the several hundred FADC-125 read-out modules for the FDC and CDC is out for bid. A readout module for the Barrel Calorimeter (BCAL) has been extensively tested using beam parasitically during a Hall B run. The final units of the 3,840 silicon photo-multipliers for the BCAL are arriving, and machining and polishing of the similar number of lightguides is underway. Production quantities of high-voltage modules, low-voltage modules, cables, and VXS and VME-64 crates are arriving.

May 16, 2012

The performance of the C100 cryomodule has now been successfully demonstrated at 104 Megavolts for more than one hour. Preparations are complete for a test at 108 MV with full beam loading this week. Assembly of the sixth C100 has been completed. Installation of the compressors and 4.5 Kelvin coldbox for the Central Helium Liquefier-2 continues. The beam position monitors for arc 10 are ready for installation. The first-article electronics for the stripline beam position monitors passed acceptance testing.

May 9, 2012

An extended period of 12 GeV installation and commissioning, known as the Long Shutdown, is on schedule to commence on May 19. To highlight the importance of safety during this busy time, pre-shutdown meetings were held on May 7-8. These lab-wide meetings have become a staple of the kick-off process for scheduled machine downs. These meetings are beneficial as a tool to communicate the planned work activities and as a refresher course on the lab's safety policies and procedures.

May 2, 2012

Winding of two coils for the Hall C Super High Momentum Spectrometer Q1 quadrupole magnet is complete and winding of the third coil has started. Soldering of the copper stabilizer to the superconducting SSC cable for the Q2, Q3 and dipole magnets is underway, with the first reels of production conductor now shipped to the magnet vendor. A contract is in place for the several hundred tons of steel yokes for those magnets. Most sections of the support structure have arrived at JLab, with the balance due in June. Detector construction funded through National Science Foundation Major Research Instrumentation university grants continues, with the parts for the quartz S2Y plane of the hodoscope now in hand at North Carolina A&T State University, and the stringing of the drift chambers underway at Hampton University.

April 25, 2012

The cryomodule voltage needed for delivering 12 GeV beam to Hall D is 98 Megavolts. This performance was demonstrated during a recent beam study period, when a C100 cryomodule was successfully operated at 98 MV for one hour. Both in-tunnel C100 cryomodules are now operating with piezo-electric tuner resonance control, resulting in substantial improvement in detuning. Installation of the compressors and 4.5 Kelvin coldbox for the Central Helium Liquefier - 2 continues. Procurement actions are underway for the box power supplies for the arc dipole magnets. Field measurements of the new curved dipole magnets for the beam transport spreaders and recombiners have been completed. The magnets met all specifications, including close approximation of the predicted shunt settings. Fabrication of the new stripline beam-position monitor cans continues.

April 18, 2012

In response to the reduced FY12 budget and subsequent extended duration of the long shutdown, the 12 GeV team has updated the FY12/13 installation schedules. These have been integrated into the lab-wide shutdown schedule. As installation activities increase in the completed 12 GeV conventional facilities, weekly meetings with Facilities Management & Logistics ensure coordination of resources. The 12 GeV team is working with FML to finalize all transportation, material handling, space, storage and waste/recycle needs.

April 11, 2012

The first sector of the preshower calorimeter for CLAS12 is complete and has been tested successfully with cosmic rays. Stacking of lead sheets and scintillator bars threaded with wavelength-shifting fibers is also complete for the second sector and has been started for the third. Two of the CLAS12 region 3 wire chamber sectors are being strung at JLab. The fifth wire chamber sector for region 2 is underway at Old Dominion University, and the third region 1 chamber is being strung at Idaho State University. High voltage and readout boards are being added to wire chamber sectors that are strung, and cosmic ray testing is underway. The first complete module of the silicon vertex tracker barrel detector has been undergoing testing for two months, and layout improvements in the readout circuitry are being implemented.

April 4, 2012

Installation of the new coldboxes for Central Helium Liquefier-2 has begun by the vendor representative. The C100-1 and C100-2 cryomodules continue to be used for beam operations; refinement of the control of the radiofrequency fields is making good progress. Testing of the fifth new cryomodule is underway in the Cryomodule Test Facility. The procurement process for the re-bid of the box power supplies (for the large dipoles in the beam transport system) is underway. While this will delay delivery relative to the earlier plan, we do not presently project any impact on the commissioning schedule. Manufacturing of the new stripline-design beam position monitor cans is underway.

March 28, 2012

Pre-planning of work activities greatly improves the overall safety of the task. Recently, the two Central Helium Liquefier (CHL-2) cold boxes that were delivered and placed into final positions required complex lifts. The operation took two large cranes, several riggers and other support personnel working in unison to complete the task. Through extensive pre-planning and clear communication of the roles and responsibilities for the people involved, these complex lifts were completed without incident.

March 21, 2012

Both of the coldboxes for the new Central Helium Liquefier (CHL-2) have arrived and have been put into final positions. The C100-1 and C100-2 cryomodules continue to be used for beam operations at voltages up to 91 MV; refinement of the control of the radiofrequency fields continues. Helium headers have been attached for the eighth and ninth C100 cryomodules. Installation of all klystrons for the new RF zones in the South Linac is complete. Adjustments to the FY12 and FY13 accelerator work plans, in response to the reduction in FY12 funding relative to the baseline profile, are nearing completion.

March 14, 2012

The Hall A upgrades within the 12 GeV Upgrade Project include improvements to the Compton and Moeller polarimeters to handle operation at 11 GeV and a remapping of the beamline dipoles and the reference dipole at the higher magnetic fields. The new quadrupole magnet required for the Moeller polarimeter has been designed and is being readied for procurement. The first components of the upgraded Compton polarimeter have been ordered.

March 7, 2012

The 12 GeV team is working to re-plan FY12 and FY13 installation activities in response to the reduced FY12 funding and subsequent extension of the machine shutdown to a 16-month duration starting in mid-May 2012. Revised schedules and resources are being coordinated with the "Long Shutdown" planning team.

February 29, 2012

The first of two new coldboxes for the new Central Helium Liquefier, CHL2, has been shipped. The C100-1 and C100-2 cryomodules continue to be used for beam operations; as of Feb. 27, they were operating at 85 Megavolts and 80 MV. All 10 cavity strings for the new cryomodules have been completed. Adjustments to the FY12 work plan continue in response to the reduction in FY12 funding relative to the baseline funding profile.

February 22, 2012

The Hall D complex beamline and infrastructure installation is continuing. All 48 Barrel Calorimeter (BCAL) modules, built at the University of Regina, Saskatchewan, Canada, have now arrived at Jefferson Lab. More than 2,200 of the 3,840 Silicon Photomultipliers for the BCAL have been received, and the first full prototype of a readout module is being assembled. The second full six-layer package (of four total needed) has been built for the Forward Drift Chamber. The manufacturing contract has been placed for several hundred Flash ADC-250 modules to be used in pipelined electronics and triggers in all halls.

February 8, 2012

The 12 GeV installation activities for the long shutdown scheduled to begin in May are under development. A weekly Long-Shutdown Planning meeting is being held to integrate the lab-wide installation schedule. With Beneficial Occupancy awarded for the Hall D Complex, ongoing installation work is being coordinated through the Hall D work coordinator.

February 1, 2012

Beneficial occupancy of the Hall D Counting House, Service Building, and Tagger Area was established Tuesday. JLab Facilities Management & Logistics has completed various tasks related to safety, including verification of proper operation of the emergency lighting systems. The construction contractor is working on the remaining punchlist items.

January 25, 2012

The warm compressors for the new Central Helium Liquefier, CHL2, have been placed in the new building, and installation of interconnect piping is underway. The eighth cavity string for the new C100 cryomodules is complete. Cryomodule C100-5 is being tested in the Cryomodule Test Facility. The final cathode power supply for the new radiofrequency systems has been delivered. An rf separator cavity was tested successfully at power levels above that needed for 12 GeV. Tests and refinement of the installed new linac zones (cryomodules and rf) continue.

January 18, 2012

Progress continues on the superconducting magnets and related infrastructure for Hall C. Winding of the coils for the Q1 quadrupole magnet for the Super High Momentum Spectrometer has started. A coil for the HB magnet was tested in a liquid helium dewar to more than 3,000 Amps of current. The copper stabilizer for the superconducting cable for the Q2, Q3 and dipole magnets has been re-shaped with the "keystone" and is ready to be soldered to the several kilometers of SSC cable. All sections of the support structure are under contract, with first sections already arrived at JLab. The five cryogenic control reservoirs are complete at the vendor and are undergoing acceptance testing. Bids are in hand for the several hundred tons of Q2, Q3 and dipole magnet yokes.

January 11, 2012

The Hall D Complex facilities have been accepted from the construction contractor. Approval for occupancy of the Counting House, Service Building and Tagger Area is expected to happen in a few weeks, following completion of various tasks related to safety and janitorial services.

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