Jefferson Lab Weekly Briefs
September 18, 2013
12 GeV Upgrade
Hall B Update: The sixth and last sector of the PreShower Calorimeter for CLAS12 is assembled and has been tested extensively with cosmic rays. Members of the Old Dominion University group are readying the last Region 2 drift chamber for shipment to Jefferson Lab and also are steadily installing high voltage and readout electronics cards on other completed chambers stored at Jefferson Lab. The fifth and sixth (i.e. last) Region 1 chambers have been strung at Idaho State University and are now undergoing tension testing of all wires. The fifth Region 3 chamber is nearing the end of wire stringing at JLab. The first production module of the Silicon Vertex Tracker (SVT) barrel has been assembled and fully tested at Fermilab and passed with flying colors, and the second module’s sensors are being attached to the next substrate. Series production of the SVT modules is thus underway at Fermilab.
The machined parts for the containment vessel for the High Threshold Cerenkov Counter (HTCC) have arrived and been assembled, and the carbon-fiber entry dish and related parts are nearing completion. The mirror assembly jig for the full main mirror for HTCC is also ready. All the Forward Time-of-Flight (TOF) 1-b slats built at the University of South Carolina have been mounted to their support arrays and are undergoing system tests as a group in a rack using cosmic rays. The second set of arrays of existing TOF slat arrays from CLAS has been refurbished, and the mirror refurbishment has been started for the existing Cerenkov Counter.
The first prototype double-pancake winding for the Torus magnet prototype coil is complete at Fermilab and is being readied for epoxy potting. Major parts orders for the Torus are being issued, with the first coil cases having just arrived at Fermilab. The first fixtures for the Torus cryostat factory are assembled and being readied for use. The design revisions from the vendor have arrived for the intermediate design review for the Solenoid magnet, with work continuing on thermal and structural analysis at Jefferson Lab and in collaboration with Brookhaven National Lab. Soldering of the superconducting cable to the copper stabilizer for these two magnets has reached the seventh reel for the Torus and will be shifted over to that for the Solenoid once a buffing operation to prepare the copper surfaces for epoxy bonding is completed for the Torus.
APS/AIP Postdoc Science Policy Fellowship Announced
Center for Theoretical and Computational Physics
Researchers at Jefferson Lab and Trinity College Dublin have reported an extraction of an excited state spectrum of isoscalar mesons using lattice QCD. Calculations on several lattice volumes were performed with a range of pion masses from around 700 MeV down to 400 MeV. The predictions for the mass spectrum of isoscalar mesons from first principle QCD calculations will provide useful guides for future experiments at Jefferson Lab.
Environment, Safety, Health and Quality
Vision in the Dark
We are all attuned for energy conservation both at home and at work, but we must not sacrifice safety for the sake of fractions of a penny in lighting costs. The cost of errors in equipment assembly or use, often exceed thousands of dollars or cause human suffering. Use what lighting you need to safely do your job without wasting energy.
JLab-wide Phone Outage: Saturday, Sept. 21
Across Jefferson Lab, the outage will disrupt:
This outage will affect Jefferson Lab and university phones in the ARC, but not the commercial tenants in the ARC.
To Get Help and Report Emergencies During the Outage:
Inquiries during the outage can be made to Jefferson Lab Security’s cell at 757-342-9868.
For more information regarding this outage, contact the IT Division Helpdesk at email@example.com.
For further information regarding Emergency Response steps to take during this phone service outage, contact Emergency Manager Tina Menefee, at firstname.lastname@example.org or call 757-768-4030.
2013 Fall Golf Outing to be Oct. 18; Register by Oct. 11
More information and directions to the course are available on the JAG webpage at: http://www.jlab.org/intralab/committees/jag/
To register for the tourney, see Mike Zarecky, in the TED, Bldg. 55, cube 2500-19, no later than Friday, Oct. 11. When signing up, you must list your average score for 18 holes. Please make checks payable to Mike Zarecky. If you have questions, contact Danny Machie, Engineering Division, ext. 7501 or Zarecky, ext. 7609.
TEDF Dedication Ceremony R.S.V.P. Due
TIAA-CREF Onsite Individual Counseling Sessions
Tracking Thomas at Jefferson Lab
JLab Calendar of Events
Sept. 23: Safety Shoe vendor onsite
|JLab Weekly Briefs is an ongoing publication providing information on the status of safety, accelerator operations, experiments, free-electron laser, reviews, upcoming activities and special events. Deadline for submission is every Tuesday by 10 a.m. Submit new items to: Public Affairs or contact Kandice Carter at x7263.|