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

  • I. Senderovich, et al. "First measurement of the helicity asymmetry E in $·$ photoproduction on the proton." Phys. Lett. B 755, 64.
  • M.M. Lowry, et al. "A cryostat to hold frozen-spin polarized HD targets in CLAS: HDice-II." Nucl. Instrum. Meth. A 815, 31.
  • Jeff Greensite and Adam P. Szczepaniak. "Constituent gluons and the static quark potential." Phys. Rev. D 93, 074506.
  • César Fernández-Ramírez, Igor V. Danilkin, Vincent Mathieu, and Adam P. Szczepaniak (Joint Physics Analysis Center). "Understanding the Nature of $\Lambda (1405)$ through Regge Physics." Phys. Rev. D 93, 074015.

Remember to submit your papers for approval to the Jefferson Lab Publications database.

Records and Information Management Month Fact of the Week
On April 6, 2016, the Archivist of the United States at NARA issued a criteria document for managing email. The four criteria for successful email management are policies, systems, access and disposition. The policy for Jefferson Lab staff is that email must be managed like records - keeping those which need to be retained and deleting those which do not. The systems we use are the email applications like Zimbra. Access ensures emails are accessible, usable and retrievable throughout their lifecycle. Finally, disposition means email is either deleted or transferred to the archives office at the proper time. Contact Kim Edwards at if you have any questions about managing your email.

RIM Trivia Question of the Week
Exchange of electronic mail first existed in the 1960s. The Compatible Time-Sharing System (CTSS) (run by the MIT Computation System) developed local email systems delivering mail between users on a single system. The networked email as we know it today was evolved in the early 1970s on the world's first operational computer network and developed by Ray Tomlinson. Name this network (acronym or full name).

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):

  • Nearly all of the Hall C upgrade mechanical installation is complete with a few punch list items remaining;
  • The infrastructure work for the Upgrade Injector Test Facility Cave 1 and 2 is complete.
  • The low-conductivity water system work was completed for the Hall B Torus power supply and vacuum skids; and
  • Supported cryogenics group with JT valve leak checks and fabrication and welding of a guard vacuum skid in the Central Helium Liquefier.

The Vacuum group is working on (week of April 20):

  • Hall C beamline raster installation (complete);
  • Hall B torus vacuum system (nearly complete);
  • Support of the CHL with turbos, pump repairs and cold box leak checks;
  • Venting and disassembly work in the Low Energy Recirculator Facility to prepare for the Darklight experiment; and
  • Continuing support of CEBAF in the current run.

Environment, Safety, Health and Quality

Old Power Strip Cause of Close Call
If you remember a few Weekly Briefs ago, there was an alert about older power strips that could overheat and start a fire.

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
Apple has stopped supporting the Quicktime for Windows product. At this time, there are several remote vulnerabilities in this software. IT has removed Quicktime from computer user desktops on IT-managed systems, however, it has not been removed from all Jefferson Lab computer user systems. Note that Quicktime was often installed at the same time as iTunes, so anyone running iTunes on their Windows system should determine if they have Quicktime installed and, if they do, remove it immediately. To remove Quicktime from your Windows machine, open the "Add/Remove Programs" menu, select Quicktime, and press remove. You should install and use Windows Media Player if you need the functionality that Apple Quicktime was providing. Those running Quicktime on Apple devices do not need to take any action at this time. If you have any questions or concerns about this vulnerability, contact the IT Division Helpdesk at or x7155.


The Ethics Corner: An Ethical Work Culture
At Jefferson Lab, an ethical culture is more than policies, a ‘statement’ from the Lab Director, or our Code of Ethics. In fact, it can be a hard thing to measure. It’s more about how things work at the lab. To learn more about how an ethical culture can lay the groundwork for you to make the right decisions in difficult situations, see the full memo.

Take Our Daughters and Sons to Work Day
The nationwide Take Our Daughters and Sons to Work Day will be on Thursday, April 28, this year. Jefferson Lab has no formal plans for the day. However, Jefferson Lab parents and grandparents are welcome to bring their school-age children/grandkids to work for all or any part of the day. School age is defined as 8-18 years of age, per the national Take Our Daughters and Sons To Work Day website. See the memo for more information.

Register for the 2016 Run-A-Round Today!
The 31st Annual Jefferson Lab Run-A-Round will be held on Wednesday, May 4, 3-6 p.m. Lab staff, users, students, full-time contractors and immediate family members are invited to participate. Participating staff, users and volunteers will receive a free 2016 JLab T-shirt. The event begins in front of CEBAF Center at 3 p.m. with the debut of the 2016 Jefferson Lab T-shirt. The run/walk starts promptly at 3:15 p.m. The run covers a flat 1.5 miles course meandering through the campus, because of current construction the course won’t be posted until the week of the event. Runners, Walkers, Attendees: Register for the Event before 5 p.m. Tuesday, May 3. Can't Run? You get a free Jefferson Lab T-Shirt by Volunteering for the Event! If you have any questions about participating or volunteering, contact Mary Jo Bailey,, x7277.

Occupational Medicine Can Help Make Your Lifting Jobs Safer, More Efficient
Lifting is something all of us do – every day – often without giving it a thought. But, in an instant, lifting something heavier than anticipated or bulky or when we aren’t paying attention to our footing, body position or breathing, can quickly result in pain and injury to our back. If you are a supervisor or a worker faced with a job that requires lifting – any type of lifting, and you would like to make the job more efficient and safer – contact Johnie Banks, Occupational Medicine at x7539 or email For more information, see the full memo.

Education Seeks Projects for Summer Honors Interns; Send Ideas/Proposals in by May 2
Six to eight outstanding high school students will be selected to participate in the lab's 2016 High School Summer Honors Program, which will be held at the lab June 27- Aug. 5. The students are currently in the 10th and 11th grades and have expressed interest in pursuing scientific and technical careers. Lab scientists, engineers and other technical managers who are interested in serving as a mentor and have a project to be accomplished this summer are asked to send a description of the work to Brita Hampton, x7633, by May 2. The students will be required to develop a poster about their project and present it during a poster session on the last day of their program. See more information about the program in the full announcement.

Research Assistantship Program Now Taking Nominations
Jefferson Lab is seeking candidates for the 2016-2017 Minority/Female Undergraduate Research Assistantship (MFURA) program. Through the MFURA program, a minority or female junior or senior level undergraduate student will work on a Jefferson Lab-related project at his or her university during the academic year. Students must be nominated by university professors with whom the students would conduct the research. Nominations will be accepted through May 2. For information on the eligibility requirements or to nominate a student, see the linked webpage. MFURA is funded by the JSA Initiatives Fund Program, a commitment from the JSA owners, SURA and PAE Applied Technologies.

Jefferson Lab Calendar of Events

April 30: Jefferson Lab Open House
May 4: Jefferson Lab Run-A-Round
May 16-19: Precision Radiative Corrections for Next-Generation Experiments workshop
May 30: Memorial Day holiday, Jefferson Lab closed