Accelerator Update for April 28, 2008 - April 30, 2008

Monday April 28

The day shift began with Operations monitoring the Recycler stash (276.3E10), with the Antiproton Source (Pbar) stacking (198.4E10), with the Main Injector, Booster and Linac operating normally, with the Collider Detector at Fermilab (CDF) in access, with DZero (D0) waiting for the colliding beam, and with the NuMI and SciBooNE / MiniBooNE (BNB) experiments taking beam.

CDF came out of access at 9:06 AM.

Operations put the Tevatron (TeV) through a dry squeeze at 9:30 AM.

At 9:31 AM, a Linac Klystron RF station (KRF7) tripped off. It reset.

Pbar experts began a study period at 9:34 AM.

At 9:52 AM, KRF5 tripped off. It reset.

TeV experts began an orbit study at 10:08 AM.

At 10:14 AM, KRF3 tripped off. It reset.

At 10:38 AM, KRF7 tripped off. It reset.

At 11:07 AM, KRF6 tripped off. It reset.

TeV experts completed their orbit studies at 1:45 PM.

Operations put the TeV into shot setup at 1:51 PM.

At 2:30 PM, KRF3 tripped off. It reset.

At 2:44 PM, KRF 7 tripped off. It reset.

Operations established store 6098 at 3:54 PM with an initial luminosity of 218.92E30.

Interlock experts reported at 4:15 PM that they had completed the Meson MTest safety system tests.

Switchyard (SY) experts began tuning beam to the Meson M01 area at 5:10 PM. They stopped about 30 minutes later.

At 6:07 PM, Operations reported a Pbar Debuncher quadrupole power supply (D:QSS) raised its output by 30 amps with no command to do so. Operators, a Pbar expert, and a power supply expert investigated. The power supply expert consulted with another expert, found a spare modulator regulation board, and began repairs.

Operations loaded a NuMI only timeline into the Time Line Generator (TLG) at 6:08 PM.

At 6:38 PM, KRF7 tripped off for the first of two times in 30 minutes. It reset.

At 7:07 PM, KRF4 tripped off. It reset.

The power supply expert reported at 8:34 PM that D:QSS was back online.

Pbar resumed stacking at 8:54 PM.

At 10:58 PM, KRF3 tripped off. It reset.

At 11 PM, KRF2 tripped off. It reset.

Operations reported at 11:53 PM that the Recycler had stashed antiprotons four times during the evening shift.

Tuesday April 29

The midnight shift began with Operations monitoring store 6098 (83.7E30) and the stash (274.3E10), with the Pbar stacking (37.0E10), and with NuMI and BNB taking beam.

At 1 AM, a Booster RF station (BRF9) tripped off. It reset.

At 1:16 AM, KRF3 tripped off. It reset.

At 1:57 AM, KRF7 tripped off. It reset.

Operations terminated store 6098 at 3:18 AM.

Operations put the TeV into shot setup at 3:29 AM.

At 3:59 AM, KRF4 tripped off. It reset.

At 4:11 AM, KRF7 tripped off. It reset.

At 5:03 AM, KRF2 tripped off. It reset.

Operations established store 6099 at 5:17 AM with an initial luminosity of 246.64E30.

At 6:57 AM, KRF6 tripped off. It reset.

At 7:05 AM, LRF4 tripped off. Operators reported that the station’s crate had failed. Operations called in Linac experts.

An expert reported at 7:42 AM that the air compressors and TeV sectors C4 and B4 were failing.

Operations reported at 7:52 AM that the Recycler had stashed five times during the midnight shift.

Operations reported at 8:01 AM that they had loaded an energy conservation timeline into the TLG.

At 8:11 AM, KRF2 tripped off. It reset.

A Preaccelerator expert accessed the I- Source at 10:15 AM to check the generator brushes.

An instrumentation expert rebooted the MI BLMs at 10:35 AM.

A controls expert rebooted the MI front end (FE) at 10:41 AM.

Linac experts completed their work on LRF4. Operations began sending beam to the Linac dump at 10:52 AM.

Operations established beam to Pbar, NuMI, and BNB at 10:56 AM.

At 10:58 AM, LRF4 tripped off for the first of six times in about 90 minutes.

At 11:03 AM, a Booster vacuum pump (IP61) tripped off. It reset.

At 11:05 AM, KRF3 tripped off. It reset.

Recycler experts began a beam instability study at 11:07 AM.

Operations began turning off beam to Booster and MI at 12:02 PM for an access to conduct RF work.

Operators prepared NuMI for an access at 12:45 PM.

At 12:48 PM, KRF6 tripped off. It reset.

At 12:51 PM, KRF4 tripped off. It reset.

Operations prepared MiniBooNE for access at 12:54 PM. They came out of access about 90 minutes later.

Booster came out of access and Operations began to switch the accelerator on at 3:42 PM.

Operations reported at 4:03 PM that they had received the Operational Readiness Clearance for the new Meson MTest experiment T978.

Operators search and secured the Meson MT6 enclosures at 4:19 PM.

Operations sent beam to the Booster dump at 4:25 PM.

At 4:40 PM, LRF4 tripped off for the first of two times in about 40 minutes. It reset.

At 4:53 PM, the Linac Klystron Buncher operating current raised itself about 20 amps. Operators lowered the Buncher to its normal level.

At 5:13 PM, KRF2 tripped off. It reset.

MI RF experts reported at 5:33 PM that they were fixing a LCW leak on a RF cavity.

At 5:38 PM, KRF7 tripped off. It reset.

At 6:45 PM. KRF3 tripped off. It reset.

At 9:14 PM, KRF6 tripped off. It reset.

MI came out of access at 7:29 PM.

At 8:03 PM, a Booster vacuum pump (IP61) tripped off. It reset.

Operations established beam to Pbar, NuMI, and BNB at 8:05 PM.

Operations sent protons to the Recycler at 8:32 PM.

At 8:43 PM, KRF3 tripped off for the first of three times in two hours and 15 minutes. It reset.

At 9:39 PM, KRF7 tripped off for the first of two times in about 90 minutes. It reset.

At 11:37 PM, a vacuum crate at MI-50 stopped responding. Operators reset a 186 card and the readbacks returned.

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

Wednesday April 30

The midnight shift began with Operations monitoring store 6099 (46.57E30) and the stash (96.1E10), with Pbar stacking (30.0E10), and with NuMI and BNB taking beam.

At 12:26 AM, LRF4 tripped off. It reset.

At 1:26 AM, Operations reported that a Booster kicker (B:MP03) had tripped off. It reset.

At 1:40 AM, KRF7 tripped off three times in four and a half hours. It reset.

At 2:06 AM, a Booster vacuum pump (IPRF17) tripped off and caused BRF7 & 8 to trip off. Everything reset.

At 3:10 AM, KRF6 tripped off. It reset.

At 3:56 AM, KRF3 tripped off for the first of two times in about two and a half hours. It reset.

Operations terminated store 6099 at 5:33 AM.

Operations began preparing CDF and D0 for access at 5:52 AM.

Operations established beam to the MTest experiment 6:51 AM.

At 7:09 AM, KRF4 tripped off. It reset.

At 7:12 AM, KRF2 tripped off. It reset.

At 7:31 AM, KRF1 tripped off. It reset.

Operations reported at 8 AM that the Recycler had stashed five times during the midnight shift.

The Plans for Wednesday

The plans for today are to allow CDF and D0 to access their collision halls and make necessary detector repairs. During these accesses, the Run Coordinator will allow many other machine repairs and studies. The next store will go in on the midnight shift.

Accelerator Update Archive

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