Accelerator Update for February 1, 2008 - February 4, 2008

Friday February 1

The day shift began with Operations monitoring the Tevatron (TeV) in store 5874 (38.18E30) and with the Recycler stash (285.4E10), with the Antiproton Source stacking (23.1E10), with the Main Injector (MI), Linac, and Booster operating normally, with the Collider Detector at Fermilab (CDF) and D-Zero (D0) using the colliding beams, and with the NuMI and SciBooNE / MiniBooNE (BNB) taking beam.

At 8:28 AM, Operations reported that two Linac dipole trim magnet power supplies had current problems. Operators contacted experts.

At 8:29 AM, the Booster West Anode Power Supply (WAPS) tripped off. It reset.

At 9:29 AM, a Linac Klystron RF station (KRF3) tripped off. It reset.

Operations terminated store 5874 at 10:01 AM.

A TeV RF expert began work on TRF3 at 10:07 AM.

At 10:14 AM, KRF7 tripped off. It reset.

Operations reported that they had prepared CDF and D0 for access at 10:16 AM.

A MI expert began a collimator study at 10:35 AM.

CDF came out of access at 10:40 AM.

At 11:51 AM, Operators had to search and secure the D0 collision hall.

At 1:27 PM, KRF6 tripped off. It reset.

Operators cycled the Pbar Accumulator busses at 1:42 PM.

Operations put the TeV through a dry squeeze at 1:47 PM.

The MI collimator study ended at 2:15 PM and Operations put the TeV into shot setup.

An instrumentation expert rebooted the MIBEAM front-end at 3:59 PM.

Operations reported at 4 PM that the Recycler stashed antiprotons three times during the day shift.

Operations established store 5876 at 4:10 PM with an initial luminosity of 264.73E30.

At 5:28 PM, a Booster RF station (BRF5) tripped off. It reset.

At 7:07 PM, BRF9 tripped off. It reset.

At 8:17 PM, KRF1 tripped off. It reset.

At 8:23 PM, LRF4 tripped off. It reset.

At 8:25 PM, the #3 MI-10 LCW pump tripped off. It reset.

At 8:51 PM, KRF7 tripped off. It reset.

At 9:35 PM, KRF2 tripped off. It reset.

At 10:40 PM, KRF3 tripped off. It reset.

Operations reported at 11:59 PM that the Recycler stashed five times during the evening shift.

Saturday February 2

The midnight shift began with monitoring store 5876 (108.3E30) and the stash (182.6E10), with Pbar stacking (26.9E10), and with NuMI and BNB taking beam.

At 12:27 AM, Operations reported that the TeV sector E2 cryo system went unstable for a short time. Operators informed the cryo system technicians at CHL and asked them to check the wet engine.

At 1:53 AM, Operations reported that a cryo system valve at sector F3 was stuck at 85% and this was causing the DEWAR to overfill. The Cryo Run Coordinator reported that replacing the actuator card could fix the problem.

At 5:26 AM, KRF4 tripped off. It reset.

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

Operations terminated store 5876 at 9:02 AM.

Operations prepared D0 and CDF for access at 9:18 AM.

At 9:34 AM, KRF7 tripped off. It reset.

At 9:49 AM, the BNB horn tripped off. It reset.

Operations began preparing the TeV for an A-E sector access. Experts will replate the D0 quadrupole (D0Q6) leads and replace a vacuum pump at F47.

At 11:27 AM, KRF7 tripped off. It reset.

At 12:43 PM, the vacuum techs working at TeV sector F47 reported that they had a vacuum station solenoid fail.

The vacuum techs reported at 2:38 PM that they had completed their work on the F47 vacuum.

Mechanical techs reported at 3:03 PM that they had finished their work on the C47 spool piece.

The TeV accesses had ended by 3:18 PM.

Operations conducted a TeV hipot at 3:28 PM.

Operations put the TeV through a dry squeeze at 5:28 PM.

At 6:13 PM, KRF2 tripped off. It reset.

At 6:22 PM, a Booster RF vacuum pump tripped off (IPRF23) and caused BRF13 & 14 to trip. Everything reset.

At 8:42 PM, various TeV devices tripped off and caused a quench. After some investigation, Operations reported that a test event bit was accidentally generated. Operations put the TeV into its recovery mode.

Operations reported at 8:20 PM that the Recycler stashed three times during the last 12 hours.

At 8:44 PM, KRF2 tripped off. It reset.

At 8:51 PM, the Linac beam stopped. Operators investigated and reported that it wasn’t getting past the end of the 750 KeV line. Further investigations revealed that the 750 KeV 90˚ bend magnet was off due to a Preaccelerator pulse-shifting interlock bit. Operators were able to reset the bit.

Linac resumed sending beam at 9:28 PM.

Operations put the TeV into shot setup at 9:36 PM.

At 10:25 PM, the TeV quenched at sector A4 during the second injection of protons. Operators discovered that a power supply (I:HT708) had tripped off on a high current indication; this trip caused bad beam positions at TeV sector F1 and induced the quench.

Operations made adjustments to an Accumulator RF station (ARF2) and to the Pbar flusher at 10:25 PM, per Pbar expert instructions.

At 10:30 PM, the NuMI beam permit tripped off due to beam in the kicker gap. It reset.

Sunday February 3

The midnight shift began with TeV recovering from a quench, Operations monitoring the stash, with Pbar stacking, and with NuMI and BNB taking beam.

Operations put the TeV through a dry squeeze at 12:10 AM.

Operations put the TeV into shot setup at 12:59 AM.

At 1:13 AM, Operations had to reboot the TeV BPMs.

Operations established store 5881 at 3:13 AM with an initial luminosity of 243.3E30.

At 5:46 AM, BRF7 & 8 tripped off due to a vacuum problem. They reset.

Operations reported at 8 AM that the Recycler stashed three times during the last 12 hours.

At 8:33 AM, BRF15 tripped off. It reset.

At 8:37 AM, KRF7 tripped off. It reset.

At 11:57 AM, the vacuum for LRF3 tripped off. It reset.

At 1:12 PM, BRF1 tripped off. It reset.

At 2:57 PM, LRF2 tripped off for the first of two times in about 90 minutes. It reset.

At 3:02 PM, BRF9 tripped off. It reset.

At 3:15 PM, KRF3 tripped off. It reset.

A Pbar expert began a study period at 5:13 PM.

At 5:55 PM, a Booster RF vacuum pump tripped off and caused BRF7 & 8 to trip off. It reset.

Operations terminated store 5881 at 7:31 PM.

Operations put the TeV into shot setup at 7:42 PM.

The Pbar study ended at 7:43 PM.

Operations reported at 8 PM that the Recycler stashed six times during the last 12 hours.

At 8:36 PM, Operations reported that the TeV was ready for antiprotons, but the Recycler was not ready to give them up; the transverse emittances had gotten too cool.

At 10 PM, the TeV suffered at quench at sector A4. Operations investigated.

Monday February 4

The midnight shift began with Operations monitoring the stash, with Pbar stacking, and with NuMI and BNB taking beam.

Operations prepared CDF and D0 for access at 12:13 AM.

At 12:23 AM, MIRF16 tripped off. It reset.

Two TeV experts arrived at 12:35 AM to help investigate the TeV quench.

At 12:48 AM, LRF4 tripped off. It reset.

At 12:52 AM, a Pbar Debuncher RF station (DRF2) tripped off. It reset.

At 3:02 AM, BRF9 tripped off. It reset.

TeV experts reported at 3:16 AM that a very poor beam lifetime during its short time in the TeV, plus very bright antiprotons and protons with large emittances, induced the quench. They recommended checking and adjusting the tunes and coupling on the helix before the next shot.

At 3:47 AM, the TeV quenched at A48 during a ramp.

Two more TeV experts came in around 5:52 AM to investigate the quench.

Operations reported at 8 AM that the Recycler stashed six times during the last 12 hours.

The Plans for Monday

The plans for today are to establish a store this morning. The Run Coordinator will allow a Pbar study.

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