Jefferson Lab Weekly Briefs September 26, 2012
Jefferson Lab Weekly Briefs
September 26, 2012
12 GeV Upgrade
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.
JSA Accepting Applications for 2013 Outstanding Nuclear Physicist Award
To test the validity of using an energy-recovered linac for isotope production, the FEL team devised a class of optics tunings that alleviates the impact of scattering in a material target. The method is notionally based on a rematch of the accelerator acceptance to the beam at the exit of the target (rather than the conventional "match the beam phase space to the accelerator"), and appears to be a promising approach to beam recovery after passing through a foil. The team continued working on planning and procurement of a ring-resonator system for operations in early 2013.
Center for Theoretical and Computational Physics
A collaboration of theorists and experimentalists from JLab and Hampton University has completed an analysis of the moments of the longitudinal structure function FL of the proton, utilizing the latest data from JLab and elsewhere. The moments are found to be underestimated by leading twist structure function parameterizations, especially for the higher moments, suggesting either the presence of significant higher twist effects in FL and/or a larger gluon distribution at high parton momentum fractions x.
The survey and alignment group (Metrology) has been busy re-aligning the cryomodules and warm region girders in the north linac to final tolerance standards (step 2B). The south cryomodules/warm region girders were re-aligned two weeks prior. The group laid out the 0L0R chicane and the stands were aligned. The R100 cryomodule was aligned in slot CA0L05. This allowed the replacement/re-alignment of the remaining west arc stands and pedestals. The last components in the west arc will be aligned to initial vacuum hook-up standards (step 2A) once they are installed. East arc magnet step 2A alignment has been ongoing over the last few weeks, when magnets have been available. The group has also carried out network measurements in Hall A in preparation for 12 GeV equipment alignment in the hall.
JLab Calendar of Events
Oct. 4-5: GlueX Collaboration Meeting
Environment, Safety, Health and Quality
Safety footwear generally denotes footwear that feature protective caps for the toes (must meet ANSI Z41 requirements) or styles that may also feature protection for the bones on top of the foot. Some shoes may be resistant to chemicals; chemical protection is rated by the manufacturer and should be suitable for the materials in use.
If you need safety footwear for your job, you may be able to obtain the appropriate type through JLab's vendor, Veteran Shoes. The vendor is onsite twice each month, as noted in the Weekly Briefs Calendar of Events (below). To obtain shoes through the vendor, you must obtain a purchase requisition in advance of the vendor's visit to be presented to the vendor when you select your shoes from inventory. You may start the process through Webstock by selecting "Safety Shoes: Veterans Shoes" in the Webstock Suppliers List, and then continuing your selections as appropriate. If you need assistance, contact Kristin Martinez, x7060.
Ensure Your JLab Mail Is Delivered!
STEM Outreach Opportunity
Tango on Tuesdays and Tango Party Fridays
Register Now for the JLab 2012 Fall Golf Outing
Flu Shots Available
Onsite Blood Drive Set for Tuesday, Oct. 23
Tracking Thomas at JLab
Congratulations this week go to Mike McCaughan, who was the first to correctly identify the location for Sept. 19. Honorable mentions go to Jared Martin, Steve Cooper and Tom Powers. Check out the Tracking Thomas webpage for a better view of his last location and this week's new mystery photo.