Accelerator Update for July 14, 2008 - July 16, 2008

Monday July 14

The day shift began with the Tevatron (TeV) being prepared for an access, with Operations monitoring the Recycler (RR) stash (369.8E10), with the Antiproton Source stacking (30.1E10), with the Main Injector, Booster, and Linac operating normally, with the Collider Detector at Fermilab (CDF) and DZero (D0) waiting for the next store, and with the SciBooNE / MiniBooNE (BNB) and Meson MTest experiments taking beam.

At 8:26 AM, Operations reported that the TeV A-E sector access was delayed due to a hipot current reading of 200mA at 1000 volts. Operations contacted experts.

Operations prepared D0 and CDF for an access at 8:44 AM.

Operations began preparing the TeV for access at 9:03 AM.

At 9:49 AM, a Linac RF station (LRF4) tripped off. It reset.

Operators reported at 9:52 AM from TeV sector E1 that the temporary sump pump was still in working order. The problem was its discharge hose had slipped back into the sump just enough to hit the pump’s on/off switch. Operators turned on the sump and rearranged the hose.

A TeV expert reported at 9:53 AM that the hipot now shows a current of 30mA at 1000 volts. He said that Operations could turn the TeV back on when needed.

D0 came out of access at 10:24 AM.

At 11:03 AM, LRF4 tripped off. It reset.

NuMI experts reported at 12:17 PM that they found an air leak on their horn closed loop suction line. They believe that the leak is on a fitting. If they are correct they should have the repairs completed by Wednesday afternoon.

CDF came out of access around 12:27 PM.

Operations put the TeV through a dry squeeze at 1:09 PM.

Operations put the TeV into shot setup at 2:08 PM.

At 3:37 PM, LRF5 tripped off. It reset.

EE support technicians reported at 3:54 PM that they were conducting thermal imaging scans of the low beta magnet power supply 480-volt breakers. Later they reported that the leads on C:AQ9 at B4 looked “slightly hot.”

Operations reported at 3:58 PM that the Recycler had stashed antiprotons two times during the day shift.

Operations established store 6297 at 4:12 PM with an initial luminosity of 291.30E30.

At 6:32 PM, a Linac Klystron RF station (KRF1) tripped off. It reset.

At 10:19 PM, BRF7 tripped off. It reset.

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

Tuesday July 15

The midnight shift began with Operations monitoring store 6297 (115.05E30) and the stash (237.7E10E10), with Pbar stacking (42.5E10), and with BNB and MTest taking beam. NuMI was off due to a horn cooling problem.

At 6:02 AM, a power supply (I:H502) trip had caused the P1 transfer line beam permit to trip. An expert reported that he replaced the power supply. Everything reset.

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

Operations terminated store 6297 at 8:09 AM.

Operations reported at 8:28 AM that two jobs had to be completed before they could put the TeV into shot setup: the 480-volt wall breaker for the Bartleson low beta quadrupole power supply (C:AQ9) needed to be replaced; and the TeV sector A4 wet engine flywheel needed to be replaced. This work had already begun.

TeV experts began a proton only study at 9:25 AM.

Operations began preparing Meson enclosures M01 – M05 at 10:03 AM for access to look for leaks in the MS2 LCW system.

Operations put the TeV through a wet squeeze at 11:31 AM and checked the orbits.

Operations put the TeV into shot setup at 12:20 PM.

LCW experts reported at 2:03 PM that they found a leak in the air-handling unit on the roof of the Meson MS2 service building. An expert estimated it would take 3-4 days to repair.

Operations established store 6299 at 2:16 PM with an initial luminosity of 308.2E30.

Meson came out of access at 3:03 PM.

A MI expert began a study period at 3:12 PM.

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

NuMI experts reported at 4:26 PM that they were ready to be interlocked.

At 5:01 PM, Operations reported that they could not turn on a Meson MTest trim magnet power supply (MT5E). Operations called in a power supply expert.

Operators reported at 6:17 PM that they had searched and secured NuMI.

Operations reported at 6:45 PM that a Booster expert worked on the Booster dampers during much of the evening shift.

A power supply expert reported at 6:48 PM that he brought MT5E online.

At 8:12 PM, BRF10 tripped off. It reset.

Operations established beam to Switchyard (SY) at 8:25 PM, but could not get good beam beyond MT4. Operators continued to tune.

At 9:54 PM, LRF5 tripped off. It reset.

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

Wednesday July 16

The midnight shift began with Operations monitoring store 6299 (103.47E30) and the stash (328.0E10), with Pbar stacking (20.4E10), with BNB and MTest taking beam, and with the NuMI horn pulsing, but not taking beam

At 2:13 AM, two vacuum pumps (I:IP7144 and I:IP7155) tripped off on the P1 transfer line. Everything reset.

At 2:41 AM, KRF3 tripped off. It reset.

Operations terminated store 6299 at 3:20 AM.

Operations put the TeV into shot setup at 3:32 AM.

Operations established store 6300 at 5:21 AM with an initial luminosity of 290.73E30.

At 6:47 AM, a Booster vacuum pump (B:IPRF17) tripped off and caused BRF7 & 8 to trip off. Everything reset.

Operations turned off NuMI at 7:05 AM and began preparing them for an access.

Operations reported at 7:55 AM that the Recycler had stashed five times during the midnight shift.

The Plans for Wednesday

Accelerator Update Archive

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