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Accelerator Update for September 17, 2008 - September 19, 2008 |
Wednesday Sept 17 The day shift began with the Tevatron (TeV) in shot setup, with Operations monitoring the Recycler stash (198.9E10), with the Antiproton Source (Pbar) stacking (54.6E10), with the Linac, Booster, and the Main Injector (MI) operating normally, with the MiniBooNE, NuMI, and the Meson MTest experiments taking beam, and with the Collider Detector at Fermilab (CDF) and DZero (D0) waiting for the next store. At 8:17 AM, a Linac RF station (LRF5) tripped off. It reset. At 9:20 AM, a Booster RF station (BRF7) tripped off. It reset. At 9:36 AM, a Booster vacuum pump (IPRF17) tripped off and caused BRF7 and 8 to also trip. Everything reset. Operations established store 6425 at 9:44 AM with an initial luminosity of 186.91E30. Operations prepared MI-31 for an access by Pelletron experts at 9:46 AM. They were out of access about 30 minutes later. The Neutron Therapy Facility reported at 10:39 AM that they had treated their last patient for the day. Operations disabled beam to MiniBooNE at 10:45 AM. Operations disabled the Proton Source beam at 10:47 AM. Operators began preparing Linac and Booster for access. RF experts reported at 10:58 AM that they were beginning work on MIRF13 and 16. Linac experts reported at 10:59 AM that they were beginning to replace the power amplifier for LRF5. Operations loaded an energy conservation time line into the Time Line Generator at 11:02 AM. Survey experts accessed Linac at 11:06 AM and began their MTA - MuCool work. Preaccelerator experts accessed the H- Source at 11:13 AM. They were out of access 20-minutes later. Operations prepared NuMI for access at 12:40 PM. Booster experts came out of access at 1:20 PM. MiniBooNE came out of access at 2:32 PM. A RF expert reported at 3:12 PM that all MIRF work had been completed. At 3:15 PM, a Booster vacuum pump (IPRF23) tripped off and caused BRF13 and 14 to also trip. Everything reset. At 3:18 PM, the Linac Debuncher cavity tripped off on a LCW flow fault. Linac experts investigated and brought it back online. Operations established beam to Pbar, NuMI, and MTest at 3:52 PM. At 3:54 PM, BRF11 tripped off for the first of three times in three minutes. After the last trip, operators bypassed the station and brought BRF19 on in its place. Operations reported at 4:01 PM that the Recycler had stashed antiprotons once during the day shift. MiniBooNE resumed taking beam at 4:09 PM. At 5:03 PM, a Linac quadrupole power supply (QPS225) tripped off. It reset. At 5:20 PM, all the Linac Klystron section vacuum valves closed. A Linac expert reported he had power cycled a SRM, which inadvertently caused valves to close. At 7:21 PM, Linac experts reported a problem with the Velocity meter; its regulation loop wasn’t working and when they power cycled the device, it blew a fuse. They adjusted the loop by hand and then disabled it. Operators will adjust as needed through the night. At 10:04 PM, Operations reported that they had been having problems with QPS114 and 115 all night. Operators swapped control cards. At 11:28 PM, LRF2 tripped off. It reset. At 11:51 PM, BRF19 tripped off for the first of three times in 12 minutes. It reset. Operations reported at midnight that the Recycler had stashed five times during the evening shift. Thursday Sept 18 The midnight shift began with Operations monitoring store 6425 (48.35E30) and the stash (229.6E10), with the Pbar stacking (28.1E10), and with the MiniBooNE and NuMI experiments taking beam. At 12:16 AM, operators changed the P4 card for a Linac power supply (QPS114). Operations established beam to MTest at 4:12 AM. Operations terminated store 6425 at 5:38 AM. Operations put the TeV into shot setup at 5:49 AM. Operations reported at 8:01 AM that the Recycler had stashed four times during the midnight shift. Operations established store 6426 at 8:07 AM with an initial luminosity of 266.7E30. At 10:37 AM, a Linac quadrupole power supply (L:QPS225) tripped off for the first of two times in 33 minutes. It reset. At 10:58 AM, Operations reported that the readbacks for two Accumulator power supplies (A:IB and A:LQ) began jumping around. A power supply expert investigated and reported that there was nothing wrong with the supplies. A Linac expert reported at 11:31 AM that the regulation loop for KRF6 was disabled. He re-enabled it. At 11:43 AM, L:QPS225 tripped off for the first of two times in about 30 minutes. After the last trip, operators swapped control cards with another power supply. Operations reported at 12:39 PM that the problem with the Linac Velocity meter was resolved. The problem had to do with KRF6 and with a timer for the digitizer that the regulation loop used. At 1:26 PM, QPS227 tripped off. This was the power supply that had received the QPS225 control card. A Linac expert changed control cards. A MI expert began a 12- batch slipstacking study at 1:47 PM. At 3:44 PM, KRF5 tripped off. It reset. Operations reported at 4 PM that the Recycler had stashed five times during the day shift. At 7:05 PM, KRF5 tripped off. It reset. At 7:33 PM, the MIRF10 modulator LCW flow dropped out and then returned to normal. Its deck tube filament tripped off and then began timing back in. At 7:42 PM, a MI kicker (I:KPS4A) tripped off on a “Pre-fire fail to fire” indication. It reset. At 11:42 PM, a Pbar Debuncher septum (D:ESEPV) tripped off. It reset. At 11:59 PM, Operations received a Pbar target rotation alarm (D:TGTREV). Operations halted stacking and called experts. Operations reported at midnight that the Recycler had stashed five times during the evening shift. Friday Sept 19 The midnight shift began with Operations monitoring store 6426 (65.18E30) and the stash (344.9E10), with Pbar stacking (31.7E10), and with the MiniBooNE and NuMI experiments taking beam. At 12:07 AM, Operations rebooted the Pbar Front End (FE). Pbar resumed stacking. At 12:11 AM, a Booster vacuum pump tripped off and caused BRF7 and 8 to also trip. Everything reset. At 12:24 AM, Operations rebooted the MI vacuum FE. At 12:28 AM, Operations reported that the Pbar FE tripped off. At 1:02 AM, Operations reported that they had rebooted the Pbar FE twice and then power cycled it; this did not fix the problem. Operations called in an expert. Pbar resumed stacking at 2:41 AM. The expert found several problems: a kicker control card that did not have any table data, a septum that was at the wrong setting, and a bad crate card. At 3:13 AM, MIRF15 tripped off. It reset. At 3:33 AM, MIRF15 tripped off again. Operations bypassed the station. Operations terminated store 6426 at 3:52 AM. Operations put the TeV into shot setup at 4:03 AM. At 4:16 AM, Operations lowered the beam intensity for NuMI due to MIRF15 being off. Operations established store 6427 at 6:20 AM with an initial luminosity of 284.69E30. Operations reported at 8 AM that the Recycler had stashed twice during the midnight shift. The Plans for Friday and the Weekend The plans for today and the weekend are to stack, stash, and store. |
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| last modified 09/19/2008 email Fermilab |
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