Accelerator Update for August 29, 2008 - September 1, 2008

Friday August 29

The day shift began with Operations monitoring the Tevatron (TeV) store 6388 (253.08E30), the Recycler (RR) stash (16.0E10), and the Antiproton Source (Pbar) stack (120.9E10), with Pbar down for a magnet replacement (PMAG), with the Linac, Booster, and the Main Injector (MI) operating normally, with the Collider Detector at Fermilab (CDF) and DZero (D0) using the colliding beams, and with the MiniBooNE and NuMI experiments taking beam.

A controls expert reported at 8:19 AM that he was swapping a controls card for a quadrupole power supply (I:QF12).

At 8:36 AM, the MiniBooNE beam permit tripped off. It reset.

At 9:15 AM, a MI RF station (MIRF15) tripped off. It reset.

At 9:33 AM, a Linac Klystron RF station (KRF5) tripped off. It reset.

At 9:47 AM, LRF3 tripped off. A Linac expert reset it.

At 10:09 AM the NuMI beam permit tripped off due to a current sag on correction magnet power supply (E:V118).

At 10:24 AM, NuMI tripped off due to a bad beam position on their target.

A MI expert began a MI-3 transfer line quadrupole settings study at 10:42 AM.

At 10:49 AM, Operations reported that a MI-40 air conditioner had stopped working. An operator contacted FESS personnel.

At 11:53 AM, a Booster vacuum pump (IPRF17) tripped off and caused BRF7 and 8 to also trip. Everything reset.

At 11:54 AM, a Linac power supply’s (L:VT1IN) output current began jumping around. An operator adjusted its current.

At 12:59 PM, V118 caused the NuMI beam permit to trip off. Everything reset.

At 1:33 PM, Operations halted the Linac beam to check on a LCW leak on LRF3. Operations loaded an energy conservation timeline into the Time Line Generator (TLG).

Linac resumed sending beam at 2:14 PM.

An instrumentation expert reported at 3:07 PM that MI experts were flying wires.

Pbar experts reported at 4:09 PM that they had completed testing the pulsed magnet.

At 4:22 PM, BRF8 tripped off. It reset.

Pbar resumed stacking at 5:11 PM.

At 5:50 PM, the 400MeV area tripped off due to bad beam positions. It reset.

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

Saturday August 30

The midnight shift began with Operations monitoring store 6388 (69.0E30) and the stash (224.1E10), with the Pbar stacking (30.9E10), and with the MiniBooNE and NuMI experiments taking beam.

At 1:46 AM, Operations reported that MIRF5 was causing the NuMI beam permit to trip off. Operators adjusted the station’s grid bias.

At 3:04 AM, MIRF5 was still causing problems. Operators bypassed the station.

At 3:40 AM, BRF16 tripped off. It reset.

At 5:30 AM, BRF16 tripped off. It reset.

At 5:37 AM, a Pbar Debuncher TWT (P4TW06) tripped off. Operators investigated and reported that its power supply was tripping off.

Operations terminated store 6388 at 6:50 AM.

Operators brought MIRF5 back online at 6:51 AM.

Operations put the TeV into shot setup at 7:02 AM.

Operations reported at 8:06 AM that the Recycler had stashed five times during the midnight shift.

Operations established store 6389 at 8:55 AM with an initial luminosity of 281.92E30.

At 9:17 AM, a Booster vacuum pump (IPRF23) tripped off and caused BRF13 and 14 to also trip. Everything reset.

At 12:43 PM, LRF5 tripped off. It reset.

At 12:53 PM, BRF16 tripped off. It reset.

At 4:39 PM, BRF16 tripped off for the first of two times in about an hour. It reset.

At 5:38 PM, NuMI tripped off due to a MI RF problem. It reset.

At 7:08 PM, BRF10 tripped off. It reset.

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

At 8:14 PM, BRF16 tripped off. It reset.

Sunday August 31

The midnight shift began with Operations monitoring store 6389 and the stash, with Pbar stacking, and with the MiniBooNE and NuMI experiments taking beam.

At 12:49 AM, LRF5 tripped off. It reset.

Operations terminated store 6389 at 1:24 AM.

Operations put the TeV into shot setup at 1:34 AM.

At 2:13 AM, BRF8 tripped off. It reset.

At 2:43 AM, BRF16 tripped off. It reset.

Operations established store 6390 at 3:40 AM with an initial luminosity of 265.1E30. Operations reported that the proton and antiproton emittances were higher for this shot than previous stores.

At 6:13 AM, Operations reported that the H- Source output had dropped. This dropped the Linac intensity.

Operations reported at 7:36 AM that with help from a Pbar expert, operators changed the position of the Pbar target.

Operations reported at 7:59 AM that the Recycler had stashed seven times during the last 12 hours.

At 10:44 AM, the lithium lens tripped off on a high temperature indication. It reset.

At 10:49 AM, BRF16 tripped off. It reset.

At 11:49 AM, the lithium lens tripped off on a high temperature indication again. Operations contacted an expert who said he would come in and investigate.

Operations reported at 12:56 PM that operators had tuned the H- Source and brought it up to its normal output of 36mA.

A Pbar expert reported at 1:27 PM that he found noise on the temperature readback line. He temporarily bypassed the alarm.

At 1:35 PM, a Klystron Debuncher cavity alarmed for the first of two times in about 90 minutes on a LCW flow fault. It reset.

At 3:13 PM, the 400 MeV area tripped off due to bad beam positions. It reset.

At 7:44 PM, BRF16 tripped off for the first of two times in two minutes. It reset.

Operations reported at 8:01 PM that the Recycler had stashed eight times during the last 12 hours.

At 8:31 PM, Operations reported more problems with MIRF5. Operations turned the station off and contacted an RF expert.

Operations terminated store 6390 at 8:51 PM.

Operations put the TeV into shot setup at 9:02 PM.

An RF expert reported at 10:27 PM that he had lowered MIRF5’s operating voltage by 5%.

Operations established store 6391 at 10:45 PM with an initial luminosity of 281.3E30.

Monday Sept. 1

The midnight shift began with Operations monitoring store 6391 and the stash, with the Pbar stacking, and with the MiniBooNE and NuMI experiments taking beam.

At 2:28 AM, BRF16 tripped off for the first of three times in two hours. It reset.

At 2:29 AM, MIRF5 began tripping off again. Operators investigated and then turned off the station.

At 4:07 AM, a Booster vacuum pump (IPRF17) tripped off and caused BRF7 and 8 to also trip off. Everything reset.

At 5:33 AM, BRF9 and 15 tripped off. They reset.

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

The Plans for Monday

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

Accelerator Update Archive

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