Accelerator Update for March 27, 2009 - March 30, 2009

The Integrated Luminosity 3/23/09 to 3/30/09 was 56.8 Pb^-1.

Friday March 27

The day shift began with Operations monitoring Tevatron (TeV) store 6932 (155.53E30) and the Recycler stash (148.2E10), with the Antiproton Source stacking (37.4E10), with the Linac, Booster, and Main Injector (MI) operating normally, with the MiniBooNE and NuMI experiments taking beam, and with the Collider Detector at Fermilab (CDF) and D-Zero (D0) experiments using the colliding beams.

FESS personnel reported at 8:37 AM that they were taking down the Meson MS1 power for substation maintenance.

At 9:08 AM, a Linac RF station (LRF3) tripped off. It reset.

At 9:37 AM, Operations reported a LCW leak in the MI-30 Upper power supply. Operators contacted a power supply technician. Later, the technician reported that leak was actually from the quadrupole supply and it was spraying on the SCRs. They will repair the leak and then replace the SCRs.

Operations put Pbar into standby and halted the MI ramp at 10:03 AM for the MI-30 power supply work.

Technicians had the MI-30 power supply leak repaired by 11:54 AM.

Operations reported that the MI-30 power supply would not turn on. Also, the power supply techs hipotted the QF bus between MI-40 and MI-6 0 at 2:17 PM and found a ground fault on. Electrical support personnel investigated.

At 2:53 PM, Operations reported that the ground fault was a high field fault that does not show up until 600 volts. Operations will try to run with this problem until after the next shot gets put into the TeV.

At 3:18 PM, Operations reported that power supply technicians had to work on a MI-30 quadrupole power supply.

At 3:52 PM, LRF3 tripped off. It reset.

Operations reported at 4 PM that the Recycler had stashed antiprotons twice during the day shift.

At 4 PM, Operations reported that the 400 MeV area beam permit had tripped off for the first of three times in three minutes. Operators reported that this was due to LRF5 tuning by the Linac Group Leader and technicians.

Operations reported that power supply technicians had completed the MI-30 power supply work at 5:09 PM. NuMI and Pbar resumed taking beam at 5:18 PM.

At 5:34 PM, the Booster East Anode Power Supply tripped off. Operators investigated and found that BRF3 had tripped off and would not reset. Operators bypassed the station and brought BRF14 online in its place.

At 7:37 PM, the 400 MeV area tripped off for the first of three times in 12 minutes. It reset.

Operations terminated store 6932 at 8:19 PM.

Operations put the TeV into shot setup at 8:30 PM.

At 9:37 PM, the TeV suffered a quench at sector E2. The TeV Deputy Department Head said he was investigating the quench.

Operations prepared CDF for access at 10:46 PM.

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

Saturday March 28

The midnight shift began with Operations monitoring the stash (107.9E10), with Pbar stacking (13.4E10), and with NuMI and MiniBooNE taking beam.

CDF came out of access at 1:13 AM.

At 1:36 AM, the TeV sector E48 kicker tripped off on a pressure indication. Operations called in an Electrical Engineering Support person to investigate.

Operations put the TeV through a dry squeeze at 2:14 AM.

The EE support person had the TeV sector E48 kicker back on by 2:47 AM.

At 3:03 AM, Operations found a TeV power supply (C:D0Q5) off. Operators reported that this power supply had history of tripping off during dry and wet squeezes. Operations contacted their TeV Specialist who suggested operators check the lead flows and then reset and turn on.

Operations put the TeV through a dry squeeze at 3:56 AM.

At 4:02 AM, LRF3 tripped off. It reset.

At 4:15 AM, D0Q5 tripped off on a lead flow temperature indication. Operations contacted their TeV Specialist and then contacted the Cryo System Coordinator.

At 6:17 AM, the Cryo System Coordinator reported that he thought there was probably an ice ball on the leads and that Operations should try another dry squeeze.

Operations reported at 6:31 AM that the TeV had successfully completed a dry squeeze.

Operations reported at 7:21 AM that they had completed an aperture scan of TeV sectors E26 and E27. Operations put the TeV through a wet squeeze.

Operations put the TeV through another wet squeeze at 8:04 AM.

Operations reported at 8:15 AM that the Recycler had stashed eight times during the midnight shift.

Operations put the TeV into shot setup at 8:28 AM.

At 9:02 AM, the TeV aborted on the sector F2 BLMs. There was no quench.

Operations established store 6938 at 9:51 AM with an initial luminosity of 274.99E30.

At 11:04 AM, the Pbar Sweeper power supply tripped off. It reset.

At 12:38 PM, the 400 MeV area tripped off for the first of three times in four minutes. It reset. Operators reported that the I- Source extractor’s current was wandering. Everything reset.

At 12:52 PM, the 400 MeV area tripped off for the first of three times in three minutes. It reset.

At 1:58 PM, Operations reported an I- Source high voltage regulation problem. It was adjusted.

At 2:26 PM, a Linac Klystron RF station (KRF5) tripped off for the first of two times in about an hour. It reset.

At 4:21 PM the NuMI beam permit tripped off when a power supply’s (E:V108) current drifted low. Everything reset.

At 4:26 PM, a Booster vacuum pump (IP61) tripped off. When an operator reset it, vacuum pumps IP71, 72 and 81 all tripped off. Everything reset.

Operations reported at 7:51 PM that the Recycler had stashed 10 times during the last 12 hours.

Operations terminated store 6938 at 8:01 PM.

Operations prepared D0 and CDF for an access at 8:25 PM.

D0 came out of access at 9:03 PM.

Operations put the TeV through a dry squeeze at 9:54 PM.

CDF came out of access at 10:18 PM.

Operations put the TeV through a wet squeeze at 11:33 PM.

Sunday March 29

The midnight shift began with the TeV in a wet squeeze, with Operations monitoring the stash, with Pbar stacking, and with NuMI and MiniBooNE taking beam.

Operations put the TeV into shot setup at 12:28 AM.

At 1:44 AM, CDF reported having equipment trouble.

Operations established store 6942 at 1:57 AM with an initial luminosity of 312.5E30.

At 3:39 AM, MI-60 suffered a vacuum burst. Operations reported that it was recovering slowly.

At 5:50 AM, MIRF4 tripped off and took down the NuMI beam permit. Operators tried to bring the station on, but could not. Operations called in a RF technician.

At 7:40 AM, Operations reported a problem with MiniBooNE’s autotune program. It seemed to be caused by a BPM.

Operations reported at 8:05 AM that the Recycler had stashed nine times during the last 12 hours.

At 8:31 AM, Operations turned off Booster beam due to a vacuum leak. The Mechanical Department Support Associate Head of Operations reported that it was likely due to a hardened O-ring.

Operations prepared the Booster for access at 9:25 AM.

At 10:08 AM, LRF3 tripped off. It reset.

RF techs reported at 11:09 AM that they were replacing the power amplifier for BRF3.

At 11:23 AM, vacuum techs reported that a Booster vacuum valve would not close. The techs reported that they had to replace its solenoid before they could begin work on the period 6 vacuum leak.

Vacuum techs reported at 1:23 PM that they found and replaced a hardened Booster O-ring. They began monitoring the pump down.

Booster came out of access at 3:45 PM.

At 3:51 PM, the MI beam permit tripped off when the coasting beam valves momentarily showed that they were closed. Everything reset.

Booster resumed sending beam at 4:25 PM.

Operations terminated store 6942 at 7:49 PM.

Operations reported at 8:12 PM that the Recycler had stashed four times during the last 12 hours. Operations put the TeV into shot setup.

Operations established store 6943 at 9:57 PM with an initial luminosity of 228.0E30.

Monday March 30

The midnight shift began with Operations monitoring store 6943 and the stash, with Pbar stacking, and with NuMI and MiniBooNE taking beam.

An RF tech reported at 12:38 AM that he was replacing the modulator for MIRF8.

At 2:55 AM, the 400 MeV area tripped off. It reset.

At 7:19 AM, the 400 MeV area tripped off. It reset.

Operations reported at 8:03 AM that the Recycler had stashed eight times during the last 12 hours.

The Plans for Monday

The plans for today are to put in a new store around noon. After the store is established, techs will hipot MI.

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