Jefferson Lab Weekly Briefs
September 26, 2012

12 GeV Upgrade

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

  • rebuild of all arc dipole magnets has been completed and three-fourths of the arc 3 dipole magnets are re-installed,
  • East Recombiner girders and dipole magnets are being installed,
  • Transport Recombiner dipole magnets have been removed,
  • West Recombiner floor/ceiling plates have been installed,
  • East Spreader is ready for new stands,
  • West Spreader has been removed,
  • 2A alignment of the east arcs is 50 percent complete,
  • 0L/0R girders are being installed, and
  • machining of all spreader/recombiner dipole magnets is nearly complete.

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.

Physics

JSA Accepting Applications for 2013 Outstanding Nuclear Physicist Award
The JSA Programs Committee established the Outstanding Nuclear Physicist Award to recognize individuals who have made outstanding and sustained contributions, including technical achievements, to experimental and/or theoretical research related to the nuclear physics program at JLab. The biennial award consists of a certificate and a $10,000 honorarium, presented to the honoree at the JLab Annual Users Group meeting. Travel for the recipient is provided by JSA. Nomination packages are due by Jan. 11, 2013.

Free-Electron Laser

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.

Engineering

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
Oct. 10-13: CLAS Collaboration Meeting
Oct. 15: Safety Shoe Vendor onsite
Oct. 17: Colloquium and Public Lecture
Oct. 23: American Red Cross Blood Drive
Oct. 24: JAG Oktoberfest
Oct. 29: Safety Shoe Vendor onsite

Environment, Safety, Health and Quality

Safety Footwear
People wear a wide variety of footwear styles, but do you know what an "appropriate type" is for the job? Whatever the need, there is a type and style suitable for the work. Use of good footwear at work helps prevent fatigue and often prevents an injury. For instance, any type of "industrial" work requires footwear with good soles, good heels (not worn down on the sides) and intact uppers.

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.

Announcements

Ensure Your JLab Mail Is Delivered!
To better serve the JLab community, all incorrectly addressed mail sent to the lab will be returned to sender beginning Nov. 1. To receive mail from the USPS, all JLab postal mail must be properly addressed. If you are in doubt about your correct mailing address, the Staff Search function or JLIST can be used to find your correct mailing address. Make certain to include your suite number in the address. If you wish to continue receiving mail from vendors that are using an incorrect address, it is important that you provide the correct address to these vendors. If you have any questions, contact Carl Iannacone at x5430 or Bill Brisiel at x7233.

STEM Outreach Opportunity
Opportunity Inc.'s Youth Program Success Summit needs volunteer physicists and engineers to help high school and college students connect with STEM career opportunities. Volunteers will help youth develop valuable networking skills while answering questions about their career and JLab. This event will take place 11 a.m.–1:30 p.m. at Norfolk State University’s Student Center on Saturday, Oct. 13. Lunch will be provided. If you are interested in volunteering, contact Jaedda Hall, 757-233-8686.

Tango on Tuesdays and Tango Party Fridays
The JLab Tango Club is again organizing free group tango lessons at Port Warwick. Beginner lessons will be held on Tuesday evenings, with intermediate lessons followed by a Tango dance party (all skill levels are welcome) on Fridays. The lessons are free, and no prior experience is necessary. For more information, see the We Hear That post or send an email with your name and contact information to Alexandre Camsonne.

Register Now for the JLab 2012 Fall Golf Outing
The tourney will kick off at noon with a shotgun start on Friday, Oct. 19, at the Golden Horseshoe Golf Club (Green Course) in Williamsburg, Va. The format will be a handicapped Captains Choice. Each foursome must include at least two JLab employees. The cost for JLab employees (you qualify if you receive a paycheck from JSA - Jefferson Science Associates, LLC) is $60. The cost for non-JLab employees is $75. The cost includes range balls, green fees, cart, food after the tournament and the prize fund. Mulligans will be sold at the course. To sign up, bring your average score for 18 holes and a check payable to Mike Zarecky to ARC 500/47. The deadline for registering for the tournament is Friday, Oct. 12. If you have questions, contact Danny Machie, x7501 or Mike Zarecky, x7609.

Flu Shots Available
Occupational Medicine is now scheduling appointments to administer Influenza vaccinations to JLab staff. If you would like to be vaccinated, contact Occupational Medicine at x7539 to schedule an appointment. Keep in mind when you schedule your appointment that for 15 minutes after vaccination, you should remain at JLab in the presence of other people and avoid safety-sensitive activities, including driving.

Onsite Blood Drive Set for Tuesday, Oct. 23
The next American Red Cross Blood Drive is scheduled for Tuesday, Oct. 23, 10 a.m.-4 p.m. in CEBAF Center Room F113. New and repeat donors are encouraged to attend. Appointments and walk-ins are welcome. To schedule an appointment, contact Johnie Banks, x7539.

Tracking Thomas at JLab
Little Thomas is visiting all corners of the JLab campus. If you can identify his location this week, email Kandice Carter with your guess. Guesses are accepted through Friday.

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.