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Accelerator Update for May 26, 2006 - May 30, 2006 |
Friday May 26 The day shift began with beam to the Booster, Main Injector (MI), and Recycler, and with experts accessing the Tevatron (TeV) to investigate a ground fault. Operations reported at 9:11 AM that vacuum technicians were checking the vacuum at TeV sector B1, and that experts were in the Transfer hall to work on the Tevatron Electron Lens (TEL). Antiproton Source (Pbar) experts began trying to establish 8 GeV reverse protons at 10:23 AM. A MI expert began a slip stacking study at 10:24 AM. Everyone had come out of TeV access by 10:57 AM. Operations reported the TeV was given permission to power the bus; at 3:40 PM there was current on the TeV bus. Booster studies ended at 5:21 PM. Operations established a 980 GeV dry store (no beam) at 10:12 PM. The ramp dumped about three minutes later due to a transductor failure. Operations reestablished a 980 GeV dry store at 11:36 PM. Saturday May 27 The midnight shift began with Booster, MI, Pbar, and Recycler studies, and with TeV power supply testing. At 2:26 AM, the TeV suffered a quench at sector E1. Cryo system experts investigated and reported at 5:30 AM that the E1 wet engine gas bottle was found valved out. Operations reported at 6:06 AM that the TeV sector E1 cryo system had recovered. Operations reestablished a 980 GeV dry store at 6:47 AM. A Pbar expert reported at 8:51 AM that Pbar had established a circulating in the Accumulator. Recycler experts began making emittance measurements at 4:11 PM. Pbar experts established beam to the Debuncher at 4:16 PM, but at a very poor efficiency. Operations established a 980 GeV dry store at 6:05 PM. Sunday May 28 The midnight shift began with Booster and Pbar conducting studies, with the TeV at 980 GeV, and with the TeV B11 separator baking. At 8 AM, Booster experts began a four-hour 400 MeV destructive beam study. At 2:18 PM, a MI enclosure door at MI-20 that hadn’t latched properly blew open due to the winds, dropping the MI interlocks, and causing Recycler to abort its protons. Everything was back on line by 3:41 PM. Monday May 29 The midnight shift began with Pbar and Recycler conducting studies, and with the TeV ramping. Pbar experts accessed their rings at 9:37 AM. They came out of access about forty-five minutes later. Operations reported at 2:30 PM that the TeV bakeout was finished and that experts were going to access the TeV. At 4:22 PM, Operations reported that lightning had caused eight Booster RF stations, the MI PSLOOP, Booster vacuum valves and chopper, and some 4000 MeV quadrupole power supplies to trip off. Operations established a dry squeeze at 10:43 PM. Tuesday May 30 The midnight shift began with Recycler and Pbar conducting studies, and with the TeV in a dry squeeze. At 1:24 AM, Operations reported a raccoon attack on the Linac gallery. It seemed to be a coordinated effort. Fortunately, by 1:53 AM, a joint force of operators and Pbar experts managed to drive the raccoons out of their hastily made fortifications. Then at 4:18 AM, the raccoons made what some thought to be a counter attack on the Division Headquarters, but others believed it to be only a simple reconnaissance incursion. No raccoons were either injured or captured during these encounters. Operator losses were low. Operations prepared Pbar for an access at 5:44 AM. Booster experts began a study period at 7:54 AM. The Plans for Today The plans are to continue with startup studies. There will be TeV safety system tests tonight. The Collider Detector and Fermilab and D-Zero will be interlocked for these tests. Experts may access the TeV tomorrow. The Run Coordinator hopes to have beam in the TeV by Thursday. Machine Reports Linac LRF1 and LRF5 have problems that are being investigated. Booster Experts tuned up their machine. They have a problem with the vertical IPM that needs further investigations. MI The MI-8 line is okay. Experts need to set the 120 GeV tune for NuMI. Experts also want to conduct an aperture scan. Pbar Experts discovered that they have a broken quadrupole shunt. They believe they are a couple days away from making antiprotons. TeV Experts believed that their ground fault was due to water on the spool piece at sector A48. The B11 separator bake was successful. They continue to condition separators. Recycler Experts held a long store of protons. The Electron Cooling SF6 cooling skid still isn’t working. Experts have discovered that they can run the Pelletron for about eight hours with only exterior cooling, and then they need to let it cool for sixteen hours. Switchyard 120 Waiting for a B2 dipole magnet to be found to replace the bad one in the P3 line. Experts are ready for beam. Unfortunately, the Booster isn’t ready to deliver the intensity MiniBooNE needs. NuMI The water mitigation work is finishing up. The chillers were run all weekend. Experts want a search and secure today and power supply testing tonight. They would like some beam tomorrow. Collider Detector at Fermilab COT techs found and fixed a bad ground that was causing their noise problems. They have closed up their plug, but not bolted it in yet. They will be ready for an access after 4 PM today. D-Zero Experts continue to check out their detector. They expect the survey crew to be finished this afternoon. They will be ready for an access after 4 PM today. More Information Comments and Suggestions
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| last modified 05/30/2006 email Fermilab |
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