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