Accelerator Update for August 8, 2008 - August 13, 2008

Friday August 8

The day shift began with Operations monitoring the Tevatron (TeV) store (87.55E30), the Recycler (RR) stash (292.7E10), and the Antiproton Source (Pbar) stack (35.1E10), and with the BNB and NuMI experiments taking beam.

Operations terminated store 6348 at 10:03 AM.

Tevatron studies began and A1 flywheel replacement began at 10:47 AM.

The A1 flywheel replacement was completed at 1:41 PM.

Operations put the TeV into a shot setup at 2:02 PM.

Operations established store 6351 at 3:50 PM with an initial luminosity of 293.0E30.

At 4:24 PM all of the MI LCW pumps tripped off. This happened when the MI60 LCW system was making up water and the head pressure dropped too low because they ran out of nitrogen. Beam was off for PBar, NuMI and BNB.

Beam returned at 5:22 PM.

Saturday August 9

The midnight shift began with Operations monitoring store 6351 (110.47E30) and the stash (164.4E10), with Pbar stacking (31.4E10), and with the BNB and NuMI experiments taking beam.

The PBar stack was lost at 10:02 AM. Pbar experts were consulted.

Operations terminated store 6351 at 11:23 AM.

Controls problems in Pbar were repaired by 2:05 PM. Stacking continued to be held off by A:IKIK module #1 (the first of 3 kicker magnets). Experts investigated

Operations put the TeV into a shot setup at 2:35 PM.

Operations established store 6353 at 4:26 PM with an initial luminosity of 279.73E30.

At 6:47 PM it was determined A:IKIK module #1 was not operating correctly. They tried to condition it at a lower voltage.

Linac RF4 PA tripped off at 8:48 PM, operators were not able to reset it, experts were called in to investigate.

Linac experts replaced the 4616 keyer driver for LRF4, beam returned at 10:53 PM.

At 11:53 PM, A:IKIK module #1 had been conditioned to 48.2 kV and Pbar returned to stacking.

Sunday August 10

The midnight shift began with Operations monitoring store 6353 and the stash, with Pbar stacking, and with NuMI and BNB taking beam.

At 6:45 AM operations received an alarm indicating the ECOOL node had tripped. Ops were unable to successfully reboot it. An expert was called in to investigate.

At 7:37 AM, ECOOL was working once again, operators also had to make an access into the pelletron to get a blower turned back on.

At 7:56 AM Pbar beam was turned off. A:IKIK module #1 was disabled. A:IKIK modules #2 and #3 will run at a higher value.

Pbar beam returned at 9:13 AM.

At 12:54 PM, A:IKIK module #1 was being powered by a separate power supply (25kV), thus allowing modules #2 and #3 to run at a lower voltage.

Operations terminated store 6353 at 8:04 PM.

Operations put the TeV into a shot setup at 8:18 PM.

Due to a massive inability to communicate with the complex through the controls system, the Master beam switch was disabled at 8:59 PM. Experts were called in to investigate.

At 10:41 PM, the network problems were traced to a NuMI Front End

Beam returned at 10:49 PM.

Monday August 11

The midnight shift began with the Tev in shot setup and with NuMI and BNB taking beam.

Operations established store 6354 at 12:15 AM with an initial luminosity of 249.36E30.

At 1:08 AM operations received an alarm indicating the ECOOL node had tripped. Ops were unable to successfully reboot it. An expert was called in to investigate.

At 2:21 AM, ECOOL was working once again, operators were getting ready to make an access into the pelletron to get the blower back on, when they were able to reset it without the access.

At 9:54 AM, Linac was prepared for access to work on the I- source.

Linac access was completed, beam returned at 12:05 PM.

NuMI was turned off at 1:22 PM to unclog a water filter for the NuMI kicker and to repair a water leak on ILAM60 power supply.

Beam returned to NuMI at 2:52 PM.

Operations terminated store 6354 at 5:53 PM.

Operations put the TeV into a shot setup at 6:03 PM.

Operations established store 6355 at 7:52 PM with an initial luminosity of 267.98E30.

Tuesday August 12

The midnight shift began with Operations monitoring store 6355 (139.75E30) and the stash (144.2E10), with Pbar stacking (18.1E10), and with the BNB and NuMI experiments taking beam.

L:QPS119 (Linac quad power supply) tripped off at 8:59 AM.

Experts replaced bad power supply cards for L:QPS119, beam returned at 9:32 AM.

Operations terminated store 6355 at 1:01 PM.

Operations put the TeV into a shot setup at 1:13 PM.

Operations established store 6356 at 3:25 PM with an initial luminosity of 287.05E30.

Wednesday August 13

The midnight shift began with Operations monitoring store 6356 (104.45E30) and the stash (216.2 E10), with Pbar stacking (25.1E10), and with the BNB and NuMI experiments taking beam.

At 1:36 AM, stacking and NuMI beam are off due to MIRF2 constantly tripping on a gap envelope fault. MIRF2 was removed from the loop and we are currently running on 17 RF stations.

Beam returned to Pbar and NuMI at 2:00 AM.

At 2:47 AM operations received an alarm indicating the ECOOL node has tripped. Ops were unable to do a successful reboot. An expert was called in to investigate.

At 3:56 AM, ECOOL was working once again, operators were having problems with getting the SF6 blower back on. After consulting with an expert they were able to reset it.

At 7:35 AM, experts returned MIRF2 to the loop, we are back to running on 18 RF stations.

The Plans for Wednesday

The plans for today are to stack, stash, and store.

Accelerator Update Archive

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