Accelerator Update for October 22, 2008 - October 24, 2008

Wednesday Oct 22
The day shift began with Operations monitoring the Tevatron (TeV) store 6503 (23.43E30) and the Recycler stash (341.7E10), with the Antiproton Source (Pbar) stacking (20.9E10), with the Linac, Booster, and the Main Injector (MI) operating normally, with the MiniBooNE, NuMI, and Meson MTest experiments taking beam, and with the Collider Detector at Fermilab (CDF) and D-Zero (D0) using the colliding beams.

Operations terminated store 6503 at 8:27 AM.

Operations put the TeV into shot setup at 8:38 AM.

At 8:48 AM, a Booster RF station (BRF11) tripped off for the first of three times in about an hour. It reset.

At 9:19 AM, Operations reported that the TeV beam aborted due to CAMAC crate problems at TeV sectors A6 and A2.

At 9:29 AM, controls experts reported that a CAMAC power supply had partially failed in such a way as to cause quench events to go out even though no quenches occurred. They replaced the power supply.

At 9:46 AM, a MI RF station (MIRF7) tripped off. It reset.

At 10:01 AM, BRF7 tripped off. It reset.

At 10:11 AM, BRF4 tripped off. It reset.

At 10:20 AM, the NuMI beam permit tripped off on a ‘Condensate Tank Level’ indication. Operations contacted an expert.

The Cryo Coordinator reported at 11:02 AM that there was a stuck Kautzky valve at TeV sector C4. Operators prepared the TeV, CDF, and D0 for accesses.

Operations prepared Pbar for a 45-minute access at 11:13 AM.

Operations prepared Linac for a one-hour access at 11:27 AM.

Operations prepared MiniBooNE for access at 11:44 AM.

CDF and D0 came out of access at 1:21 PM.

Cryo system experts reported at 1:39 PM that they had reseated the C4 Kautzky valve.

The TeV came out of access at 2:28 PM.

A Linac expert reported 2:29 AM that they had replaced the power amplifier for LRF3. They explained that this tube would take quite a while to stabilize; meaning it will trip off regularly for a while.

MiniBooNE came out of access around 3:09 PM.

Operations put the TeV through a QBS ramp at 4:05 PM.

Operations reported at 4:19 PM that the Recycle had stashed antiprotons once during the day shift.

Operations put the TeV through a dry squeeze at 4:29 PM.

At 5:17 PM, KRF7 tripped off. It reset.

Linac experts reported at 6:35 PM that LRF3 had pumped down and was back online. Linac resumed sending beam.

At 7:26 PM, BRF7 tripped off. It reset.

Operations put the TeV into shot setup at 7:51 PM.

At 9:11 PM, LRF3 tripped off. It reset.

Operations established store 6506 at 9:18 PM with and initial luminosity of 272.8E30.

At 10:19 PM, BRF15 tripped off. It reset

At 10:32 PM, LRF5 tripped off for the first of two times in 22 minutes. It reset.

Operations reported at midnight that the Recycle had stashed three times during the evening shift.

Thursday Oct 23
The midnight shift began with Operations monitoring store 6506 (166.06E30) and the stash (78.2E10), with Pbar stacking (22.5E10), and with the MiniBooNE and NuMI experiments taking beam.

At 12:47 AM, LRF5 tripped off. It reset.

At 1:02 AM, BRF7 tripped off. It reset.

At 2:05 AM, LRF3 tripped off. It reset.

At 2:08 AM, two Booster beam valves (BV19 and BV21) closed, which turned off the Gradient Magnet Power Supply (GMPS) and the Booster Chopper. Everything reset.

At 2:27 AM, LRF3 tripped off. It reset.

At 3:16 AM, LRF5 tripped off. It reset.

At 6:29 AM, two Booster beam valves (BV19 and BV21) again closed, which again turned off the GMPS and the Booster Chopper. Everything reset.

Operations established beam to MTest at 6:32 AM.

Operations reported at 8:02 AM that the Recycle had stashed seven times during the midnight shift.

At 8:11 AM, BRF15 tripped off. It reset.

At 12:54 PM, BRF7 tripped off. It reset.

At 1:14 PM, BRF10 tripped off. It reset.

Operations terminated store 6506 at 2:35 PM.

Operations put the TeV into shot setup at 2:47 PM.

Operations reported at 4:04 PM that the Recycle had stashed six times during the day shift.

At 4:13 PM, LRF3 tripped off. A Linac expert brought it back online.

Operations established store 6507 at 4:21 PM with an initial luminosity of 303.94E30.

At 4:36 PM, the NuMI beam permit tripped off when the output of a quadrupole power supply (E:QD108) dropped. Everything reset.

At 5:34 PM, the LCW pump for the LRF2 cavity tripped off and caused two quadrupole power supplies (201 and 231) to also trip. An expert investigated.

Operations put Pbar into standby mode at 5:42 PM.

A Linac expert brought the LRF2 pump and quadrupoles online at 6:19 PM. Pbar resumed stacking.

At 6:56 PM, store 6507 aborted. There was no quench. A CAMAC crate power supply at TeV sector C4 failed.

Operations disabled beam to MTest at 7:10 PM.

Operations put the TeV through a dry squeeze at 7:53 PM.

Operations put the TeV through a wet squeeze at 8:27 PM.

At 8:43 PM, LRF3 tripped off. It reset.

A TeV expert began a chromaticity tracker study at 9:30 PM.

At 10:05 PM, LRF3 tripped off. It reset.

At 10:57 PM, LRF5 tripped off. It reset.

Operations put the TeV through a dry squeeze at 11:34 PM.

Operations reported at midnight that the Recycle had stashed six times during the evening shift.

Friday Oct 24
The midnight shift began with Operations monitoring the stash (198.1E10), with Pbar stacking (18.7E10), and with the MiniBooNE and NuMI experiments taking beam.

Operations put the TeV into shot setup at 12:18 AM.

At 1:21 AM, BRF7 tripped off. It reset.

Operations established store 6512 at 1:49 AM with an initial luminosity of 192.42E30.

At 1:51 AM, BRF7 tripped off. It reset.

At 2:26 AM, LRF3 tripped off. It reset.

At 5:28 AM, a Booster vacuum pump (IPRF17) tripped off and caused BRF7 & 8 to also trip. Everything reset.

Operations established beam to MTest at 6:01 AM.

At 6:40 AM, the NuMI beam permit tripped off when the output current of QD108 sagged. Everything reset.

At 6:52 AM, LRF3 tripped off for the first of two times in 27 minutes. It reset.

At 7:33 AM, KRF7 tripped off. It reset.

Operations reported at 7:56 AM that the Recycle had stashed six times during the midnight shift.

The Plans for Friday and the Weekend
The plans for today and the weekend are to stack, stash, and store.

Accelerator Update Archive

More Information
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