Jefferson Lab Weekly Briefs October 7, 2009
Jefferson Lab Weekly Briefs
October 7, 2009
12 GeV Upgrade
The contract for the fabrication and installation of the 4.5K coldbox for the expanded Central Helium Liquefier was awarded. Teams from JLab held contract kick-off meetings with the vendor for the accelerating cavities, as well as the vendors for the following accelerator magnets: quadrupoles, 4-meter dipoles and septa. The construction vendor for the 4-meter arc dipole magnets for the beam transport system has ordered the low-carbon iron for the fabrication. The vendor for the accelerating cavities has ordered the high RRR niobium needed for the fabrication. The extraction, instrumentation & controls/safety systems (I&C/S) and accelerator commissioning planning teams achieved 100 percent completion of their Project Engineering & Design scope.
Experiment E05-109 (HAPPEX-III) continues taking data with an uptime of ~90 percent in Hall A, although the experiment's high luminosity and low spectrometer angles (12.5 deg) are conducive to equipment failure due to radiation. So far, the experiment has accumulated 106 Coulombs out of the 250-Coulomb goal.
APS April Meeting Abstract Submission Deadline is Oct. 23
AIP State Department Fellowship Application Deadline is Nov. 1
Operations personnel delivered beam to the halls with some down times. Last Tuesday, about 10 hours were spent to commission cryomodule 1L04; six cavities had been turned on. The accelerator energy was adjusted three times to meet Hall C experimental requirements; the energy shifts for Hall C were -1, +1 and +20MeV. On Friday the north linac local oscillator 1427 amplifier failed, which tripped off the radiofrequency system in the north linac; the faulty amplifier was replaced. Over the weekend, there were capture cooling problems, a water leak in zone 2L21 and issues with the personnel safety system; all the faulty parts were replaced. Additionally, a vacuum valve in the 4T region would not open due to a split air hose; the hose was repaired.
The FEL team has the streak camera operating again and has found this diagnostic extremely useful in helping to characterize the tunable pulses from the new drive laser. Modifications aimed at making fast shutdown more reliable have been completed, and this enables continuous wave operations again at 4.8 MHz. A new gun ceramic with built-in resistivity has passed two bake cycles under vacuum at 250 C without leaks.
The 12 GeV Upgrade will allow researchers to probe the structure of the proton and nuclei at much shorter distances and higher excitation energies with more precision than previously possible. The Institute of Nuclear Theory (INT) at the University of Washington in Seattle is presently conducting a 10-week program of workshops and informal meetings in order to further develop and expand JLab's 12 GeV physics program and discuss exciting new applications of the upgraded facility. In the first week, the workshop focused on studies of the 3-dimensional quark/gluon structure of the proton and brought together more than 40 international experts in experimental and theoretical nuclear physics.
JLab's Safety Numbers
84 Days since Last Recordable Accident (JLab record: 331)
JLab Calendar of Events
Oct. 8: Farewell Reception for Chief Scientist Tony Thomas
Environment, Safety, Health & Quality
October 4-10 is Fire Prevention Week, established to commemorate the Great Chicago Fire of 1871. The fire killed more than 250 people and left 100,000 homeless. It began on Oct. 8, 1871. It was not the worst in history - only the most remembered. The Peshtigo Fire, the most devastating forest fire in American history, also occurred on Oct. 8, 1871. It roared through Northeast Wisconsin and burned down 16 towns, killed 1,152 people and scorched 1.2 million acres before it ended. Those fires changed the way firefighters and public officials thought about fire safety.
Fire Prevention Week 2009 focuses on burn awareness and prevention, as well as keeping homes safe from the leading causes of home fires. Simple actions, such as testing the water before putting a child in the bath or wearing short or close-fitting sleeves when cooking on the stovetop, may be all it takes to prevent devastating burns. More info is available at the Fire Prevention Week website.
ES&H Manual Revision Update and New Content
Computing and Networking Infrastructure
Pager System Update
All-Hands Meetings Set for Friday, Oct. 9 in the CEBAF Center Auditorium
Change in Main Phone Number for SURA Residence Facility
American Red Cross Blood Drive Results