Jefferson Lab Weekly Briefs June 9, 2010
Jefferson Lab Weekly Briefs
June 9, 2010
12 GeV Upgrade
Ninety of the expected 114 new beam transport quadrupole magnets have been delivered; all magnets that have been tested are significantly better than the specifications by a factor of four or more. Preliminary analysis of the field data for the 1st article 4-meter dipole magnet indicates that it is within specifications. Testing of the 1st article klystron has been delayed due to a vacuum leak; testing will resume in June and the vendor projects meeting the contractually scheduled delivery date. Vendor designs for the cathode power supplies and waveguide isolators passed the preliminary review by JLab. Construction of the shunts upgrades has begun. Assembly of the low-level radiofrequency system’s stepper motor controller chases has been completed. Installation of the Central Helium Liquefier subsystem hardware has begun in the CHL building addition. Deliveries of the helium circuits and cold vacuum valves for the 12 GeV cryomodules have been completed.
The accelerator ran with scheduled and unscheduled downtimes this week. An accelerator hurricane preparedness power test was conducted successfully on Thursday. During the test, the generator started properly; all automatic transfer switches operated properly; and the CHL did not trip. Issues with some systems were identified and will be addressed accordingly. It took more than two shifts to prepare and conduct the test and then restore beam delivery. Over the weekend, the CHL tripped twice, causing about three shifts of downtime. CHL personnel are still investigating the causes of the trips. On Sunday, the electronics package of the injector aperture No. 1 cooling water system was water damaged, which caused about three hours of downtime.
FEL staffers continue to make good progress on analysis of high-brightness transport in bends and have identified a possible approach to compare simulations with the experimental results on the infrared upgrade. The FEL team is also making good progress on getting systems ready for ultraviolet lasing later this summer, although there has been a delay in producing the required heater power supplies for high gradient. The team will attempt to run at 135 MeV this week.
JLab's Safety Numbers
42 Days since Last Recordable Accident (JLab record: 331)
JLab Calendar of Events
June 7-9: JLab Users Group Workshop and Annual Meeting
Summer Education Calendar
Environment, Safety, Health & Quality
JLab has a very good injury record, however, since October 2008, there have been a total of eight recordable injuries (requiring treatment beyond first aid). In three of them, inadequate work planning was determined as the primary cause. In another three cases, situational awareness was the cause.
Human performance studies report that, on average, people make five mistakes an hour. A job plan, attention to detail and stopping to think about the consequences of your task and those around you can help minimize the risk of making mistakes. Here are some things to keep in mind as you plan your work:
The full document containing this information, issued by Mary Logue, JLab's ESH&Q associate director, can be found online.
Work Observation Program Training
Summer Power Shedding Test to Be Held Thursday
The lab will participate in a one-hour test to be held between 2-3 p.m. on Thursday. Designated lab personnel will be notified via e-mail, phone and/or pager. Upon notification, the lab will e-mail staff and users and request that unnecessary lights and electric loads be turned off. At the end of the annual test or an actual event, the lab will again e-mail staff and users. For more information, see the JLab OnTarget newsletter article.
New Safety Eyewear Vendors
Recharge Today at the Quark Cafe!
Sign Your Kids Up for a Summer Physics Fest