Accelerator Update for August 27, 2008 - August 29, 2008

Wednesday August 27

The day shift began with Operations monitoring the Tevatron (TeV) store 6382 (181.65E30) and the Recycler (RR) stash (97.2E10), with the Antiproton Source (Pbar) stacking (35.9E10), with the Linac, Booster, and the Main Injector (MI) operating normally, with the Collider Detector at Fermilab (CDF) having solenoid problems, with DZero (D0) using the colliding beams, and with the MiniBooNE and NuMI experiments taking beam.

At 8:38 AM, the Linac Klystron Vernier tripped off on a LCW flow fault. It reset.

At 9:27 AM, a Linac Klystron RF station (KRF2) tripped off. It reset.

At 10:05 AM, the 400MeV area beam permit tripped off for the first of seven times in 90 minutes due to bad beam positions. It reset.

A MI expert began a coalescing study at 10:18 AM.

The Neutron Therapy Facility (NTF) reported at 11:37 AM that they had treated their last patient for the day.

A Linac expert began tuning the Linac beam at 11:53 AM.

A MI expert reported at 11:56 AM that she had completed her study.

At 12:35 PM, LRF4 tripped off. A Linac expert responded and brought the station back online.

A Recycler expert reported at 12:47 PM that he had installed an amplifier on the Recycler 2-4 Stochastic Cooling system.

CDF reported at 1:02 PM that they were turning on their solenoid.

At 1:14 PM, BRF15 and 16 tripped off. They reset.

A Linac expert reported at 1:36 PM that he had changed out the power supply for a Linac correction magnet (L:TRIM90).

At 1:41 PM, LRF5 tripped off. It reset.

A MI expert began another coalescing study at 2 PM.

At 2:52 PM, the 400 MeV area tripped off due to bad beam positions. It reset.

Operations reported at 4:02 PM that the Recycler had stashed antiprotons five times during the day shift.

At 6:20 PM, BRF10 tripped off for the first of two times in one minute. It reset.

Operations terminated store 6382 at 7:35 PM.

Operations put the TeV into shot setup around 7:46 PM.

Operations established store 6383 at 9:24 PM with an initial luminosity of 266.3E30.

Operations reported at midnight that the Recycler had stashed four times during the evening shift.

Thursday August 28

The midnight shift began with Operations monitoring store 6383 (163.06E30) and the stash (96.7E10), with the Pbar stacking (22.3E10), and with the MiniBooNE and NuMI experiments taking beam.

At 1:15 AM, LRF4 tripped off. It reset.

At 1:28 AM, BRF15 and 16 tripped off. They reset.

At 2:02 AM, BRF15 tripped off. It reset.

At 3:26 AM, BRF8 tripped off. It reset.

At 3:52 AM, BRF9 tripped off. It reset.

Operations terminated store 6383 at 6:31 AM.

Operations prepared CDF and D0 for access at 6:42 AM. They also prepared TeV sectors A-E and the Transfer Hall for access.

Cryo system experts reported at 7:14 AM that they were beginning bearing work on wet engines at TeV sectors A1 and B3.

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

At 8:07 AM, BRF9 tripped off. It reset.

At 9:37 AM, BRF11 and 15 tripped off. They reset.

MI experts began an injection study at 9:54 AM.

A TeV expert reported at 10:54 AM that he was rebooting the TeV Front-End.

A MI expert reported at 11:23 AM that he had changed out the bias power supply for MIRF5.

At 12:38 PM, BRF10 tripped off. It reset.

At 12:56 PM, LRF4 tripped off. It reset.

At 12:58 PM, the NuMI beam permit tripped off due to a power supply (E:V108) suffering a current sag.

FESS personnel reported at 3:09 PM that the TeV sector E1 sump pump had been replaced.

Operators searched and secured the CDF enclosure at 3:19 PM.

At 3:24 PM, Operations reported an Electron Cooling (Ecool) alarm from the Recycler. Operators restarted AccelNet and the Ecool VME, but they could not turn on the blower or the rotating shaft. Operations called in experts.

At 4:11 PM, a quadrupole magnet power supply (QF12) suffered a current sag. This caused the P2 transfer line beam permit to trip off. Everything reset.

Operations reported at 4:13 PM that the Recycler had stashed five times during the day shift.

At 4:18 PM, QF12 caused the P2 line to trip again. Everything reset.

At 4:19 PM, BRF10 tripped off. It reset.

At 4:49 PM, a Booster vacuum pump (IPRF17) tripped off and caused BRF7 and 8 to trip off. Everything reset.

At 4:53 PM, BRF5 tripped off for the first of four times in 42 minutes. Operations called in an RF expert.

Ecool came back online at 4:57 PM.

At 5:35 PM, LRF4 tripped off. It reset.

The TeV A-E enclosures and the Transfer Hall came out of access at 5:51 PM.

D0 came out of access at 6:10 PM.

Operations put the TeV through a dry squeeze at 8:46 PM.

At 8:58 PM, the Pbar pulsed magnet power supply (PMAG) tripped off. Operators could not reset the supply. Operations called in experts.

At 9:02 PM, the P2 line tripped off. It reset.

Operations put the TeV through a wet squeeze at 9:17 PM.

At 9:38 PM, the TeV suffered a low beta quench. Operators investigated and reported that the quench was not beam related. A TeV expert discovered that B0Q6 was the cause. Operations called in experts.

Friday August 29

The midnight shift began with Operations monitoring the stash (366.3E10) and the Pbar stack (122.5E10), with TeV experts investigating B0Q6, with Pbar not stacking due to a bad magnet, and with the MiniBooNE and NuMI experiments taking beam.

At 12:03 AM, Pbar experts reported that the Pbar Pulsed magnet was bad and had to be replaced.

At 12:09 AM, KRF9 tripped off. It reset.

At 12:30 AM, BRF8 tripped off. It reset.

Operations prepared CDF for an access at 12:35 AM.

CDF came out of access around 2 AM.

TeV power supply experts reported at 4:20 AM that they had changed out a contactor for B0Q6 and brought the power supply back online.

Operations put the TeV through a dry squeeze at 4:40 AM.

Operations put the TeV through another dry squeeze at 5:34 AM, followed by a wet squeeze.

Operations put the TeV into shot setup at 5:59 AM.

Operations established store 6388 at 7:39 AM with an initial luminosity of 290.2E30.

The Plans for Friday and the Weekend

The plans for today are to replace the Pbar Pulsed Magnet and then for the rest of the day and the weekend to stack, stash, and store.

Accelerator Update Archive

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