Jefferson Lab Weekly Briefs April 28, 2016
Jefferson Lab Weekly Briefs
April 28, 2016
12 GeV Upgrade
Installation of the collimator box between the HB and Q1 magnets on the Super High Momentum Spectrometer in Hall C has been delayed about a week for issues with the O-ring that forms the vacuum seal between these components. Design details are being finalized for the beamline to be used when the SHMS is positioned very close to the electron beam. The field of the SHMS Dipole magnet is being measured at low current at the factory in France. Welding and leak-checking the various volumes of this magnet will resume when the welding subcontractor returns to the magnet factory in late April. Jefferson Lab is providing expert guidance and equipment to help the vendor perform the required vacuum leak-checking. The Cryo-Control Reservoir (CCR) of the dipole is being crated for an early delivery to Jefferson Lab. This will allow the vendor's staff to concentrate on magnet assembly while Jefferson Lab assists with finishing the details on the CCR. The Q2 and Q3 magnets, in the same French factory, are both just a few assembly steps behind the dipole. Q2 now has all of the wiring to the external interfaces complete, including the connections of the superconducting current leads. The Q3 magnet has been moved off the assembly tool and is resting on its shipping cradle along with its CCR.
The design of the downstream support structure for the Central Time of Flight (CTOF) for CLAS12 is complete. The design for the installation arm and transport strongback will be complete this month. Procurement of these items will mark completion of the CLAS12 detector construction. The remaining item needed for the CTOF commissioning, the light fiber bundle to distribute monitoring laser light to the CTOF slats, is on order. Installation of all six Low Threshold Cerenkov Counters sectors is complete, with cabling and checkout underway. Installation of four of the six Forward TOF panel-2 sectors was also done, with cabling and checkout ongoing. The last two FTOF panel 2 sectors, the lower pair, awaits installation of the Region 3 drift chambers, which is planned for early September, because of the space needed to maneuver the large drift chamber sectors into position in the Torus magnet. The first article has arrived for the remaining fast electronics modules, the Crate Trigger Processors, needed to complete the DAQ and triggering systems for Hall B. It has passed its reception tests and is now undergoing intensive acceptance testing prior to releasing the main production order by end of April.
Jefferson Lab Published Journal Articles, April 10-15
Remember to submit your papers for approval to the Jefferson Lab Publications database.
Records and Information Management Month Fact of the Week
RIM Trivia Question of the Week
All responses must be received via email by Kim Edwards by noon on Friday, April 29, when a random drawing will take place of all correct answers. One person will win a Starbucks gift card! (Winners will be notified via email no later than 5 p.m. Friday following publication. Limit one gift card win per person.)
The correct answer for the April 13 question was Internet of Things, or IoT. Thanks to all who played and congratulations to Larisa Thorne for winning the Starbucks gift card after being randomly selected out of all correct answers.
Center for Theoretical and Computational Physics
A new paper has studied the P-wave ππ → πγ transition amplitude from lattice quantum chromodynamics. The amplitude was determined for a range of discrete values of the ππ energy and virtuality of the photon, and the expected dynamical enhancement due to the ρ resonance has been observed. Describing the energy dependence of the amplitude, the study was able to for the first time analytically continue into the complex energy plane and from the residue at the ρ pole extract the ρ → πγ transition form factor.
The Installation group is working or completed the following projects (week of April 20):
The Vacuum group is working on (week of April 20):
Environment, Safety, Health and Quality
Old Power Strip Cause of Close Call
Recently, a Jefferson Lab employee realized that he had forgotten to check all the power strips at home (based on the Weekly Briefs warning). He was using a power strip under the bed to power a clock, cell phone charger and a small lamp on the bedside nightstand, which is a pretty typical scenario. For some reason last week, at about 3 a.m., he woke up to the smell of "hot plastic." Remembering the power strip issue, the employee jumped out of bed and found the "power on" light cover on the power strip had melted, and the unit was emitting smoke. The employee unplugged the power strip, yanked it out from under the bed and put it on a non-flammable surface.
That family was lucky. Hidden power strips can get too hot by being buried under flammable materials or overloaded with too many appliances or high-current items plugged into them. Remember that power strips have power load limits, so do not push beyond those limits. Never "daisy chain" them together. Tonight, take a moment to make sure your home power strips aren’t on the recall list, and check your power strips to make sure that they aren’t under flammable items, overloaded or connected in series. These simple checks could be life-savers.
Computing and Networking Infrastructure
Cybersecurity Alert: Quicktime for Windows Vulnerability
The Ethics Corner: An Ethical Work Culture
Take Our Daughters and Sons to Work Day
Register for the 2016 Run-A-Round Today!
Occupational Medicine Can Help Make Your Lifting Jobs Safer, More Efficient
Education Seeks Projects for Summer Honors Interns; Send Ideas/Proposals in by May 2
Research Assistantship Program Now Taking Nominations
Jefferson Lab Calendar of Events
April 30: Jefferson Lab Open House