Accelerator Update - June 2-June 4
At 10:48 AM, the MiniBooNE horn tripped off.
The Linac RF station work finished at 2:13 PM. Operations established beam in Linac and then had beam to MiniBooNE by 2:42 PM.
At 2:45 PM, the Tevatron Electron Lens (TEL) went unstable. Operators notified an expert who investigated the problem.
At 5:03 PM, Operations terminated store 2636. Operator then made the Collider Detector Facility (CDF) and D-zero (D0) collision halls ready for access. They also prepared the TeV sectors A-E for access.
Cryo system techs found a water leak on a TeV sector A4 spool piece at 6:15 PM. Water techs were called in to make repairs. The Cryo techs also found a nitrogen leak in the same area and believe that was the cause for the ice ball. Other Cryo techs were called in to carefully thaw out the ice ball.
Tuesday June 3
By 3:11 AM all the TeV work and accesses had ended and Operations had begun the TeV turn on.
Operations put the TeV through a dry squeeze at 4:29 AM.
Operators discovered a TeV quadrupole magnet (B0Q3) not operating normally. Operators called in experts to make repairs.
At 10 AM, the TeV turn on resumed, but thirty minutes later was put on hold to investigate a number of power lead problems in sectors BA and BB. Experts accessed these areas and made adjustments.
Operations established beam to the TeV at 12:27 PM for a tune up.
Operations put the TeV through a dry squeeze at 1:04 PM.
At 2:37 PM, Operations put the TeV back into shot setup.
Operators accessed the H- Source to investigate a NTF water valve at 2:48 PM. The access took thirty minutes.
At 3:25 PM, an AP0 breaker tripped off causing the loss of power to a number of devices in the Pbar transfer lines AP2 and AP3. The breaker reset okay, but may need work in the future.
A Linac expert investigated a power fluctuation in RF station LRF1 at 3:43 PM. After protons were loaded for the upcoming shot, LRF1 was rested at 4:55 PM. This halted the delivery of beam to MiniBooNE. The power amplifier tube for LRF1 is dying and may not last long.
The MiniBooNE horn tripped off at 6:04 PM.
Operation brought LRF1 back online and resumed stacking and sending beam to MiniBooNE at 6:10 PM.
Wednesday June 4
At 2:41 AM, a MiniBooNE power supply (E:MBEXPS) tripped off. Operators could not reset the device and called in experts. The experts had the device repaired by 5:14 AM. There was no MiniBooNE beam during this time.
Operations noticed a pressure drop in the Pbar LCW system at 5:21 AM. Operators contacted the Duty Mechanic who discovered a pump had tripped off. The Duty Mechanic started up a backup pump and pressures returned to normal.
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|last modified 6/4/2003 email Fermilab|