Jefferson Lab Weekly Briefs February 11, 2016
Jefferson Lab Weekly Briefs
February 11, 2016
12 GeV Upgrade
Now that the Horizontal Bend magnet is running at full current, the magnetic fields it generates are being "mapped" (carefully measured at each position in a three-dimensional grid). Detailed knowledge of the main field within the bore of the magnet is needed, so that physicists can interpret the data that comes from the spectrometer during experiments. It is also necessary to have a good measurement of the field outside this particular magnet, because it can deflect the primary electron beam during some experiments. Devices that minimize or counteract this deflection must be designed now, using the measured field as a guide.
In France, the repair of the damaged inner thermal shield of the dipole magnet was completed relatively quickly, so the vendor chose not to divert attention to making early measurements of this magnet's field. The entire shield is made up of an inner cylinder, an outer cylinder, and two endcaps that connect the cylinders. Both the inner and outer surfaces of the shield assembly get a covering of aluminized mylar super insulation -- like many layers of 'space blanket'. All of these parts are in place now, and welding has begun to hold them permanently in position. The pipes that supply liquid nitrogen to cool the shields are being joined by welding, too. Once they have been certified leak-free, the thick outer vacuum vessel will be sealed by welding its two endcaps in place. At this point, in just a few weeks, the dipole factory assembly will be finished and it will start a series of magnetic and leak tests before being readied for shipment to Jefferson Lab's Hall C. The first of the two identical quadrupole magnets, Q2 and Q3, is only several weeks behind the dipole in the same fabrication process. All of its parts are ready and are being put together in a trial fit now. Some of the shield subassemblies for the last quadrupole magnet still need final welding details for mounting brackets, and a final leak check. They will arrive at the magnet vendor's factory only after space becomes available.
Jefferson Lab Published Journal Articles, Feb. 1-5
Remember to submit your papers for approval to the Jefferson Lab Publications database.
Publications Refresher Course Offered Feb. 23
Apply Now for the Graduate Fellowship Program at Jefferson Lab
JSA Offers Sabbatical and Research Leave Support at Jefferson Lab
JSA Thesis Prize Call for Nominations
Jefferson Lab Calendar of Events
Feb. 18: Colloquium and Public Lecture: Tunnel Visions by Micheal Riordan
Environment, Health, Safety and Quality
Dangling Items from the Head/Neck and Rotating Equipment
What is a dangling item? Hair long enough to stay vertical when the head is tipped, long necklaces, a badge lanyard, chains, reading glasses draped around the neck and many other items. It is vital to your wellbeing to remove these items altogether or secure them so that they can not be grabbed by equipment. Prevention is simple: Get the hair tucked securely up out of the way or take off (not just flip around) the items from around the neck.
This is an especially important reminder for those who supervise new employees or mentor students, workers who may have never before been exposed to this type of work environment: dangling items have no place in a workplace where power tools and machinery with moving parts are present.
Computing and Networking Infrastructure
IT Maintenance Day Set for Tuesday, Feb. 16
Computer User Account Request Form Online
User Account Audit Beginning Feb. 15
Jefferson Lab Entrance Closure on Feb. 15: Lawrence Drive
2016 Annual T-Shirt Design Contest Starts Feb. 15
JLab Golf League Forming for 2016 Season
Retiree Medical Transition
Benefits Open Enrollment Underway for All Regular and Term Employees
January Blood Drive a Success!
|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.|