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Accelerator Update for February 15, 2008 - February 25, 2008 |
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Friday February 15 The day shift began with Operations monitoring the Tevatron (TeV) store 5909 (18.9E30) and the Recycler stash (288.9E10), with the Antiproton Source stacking (25.6E10), 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) experiments taking beam. Day shift: Tevatron experts conducted end-of-store orbit measurements and collider adjustments, and then ended the store. Operations established tore 5911 with an initial luminosity of 256.0E30. The Recycler stashed antiprotons. Experts tuned the Booster and the MI RF systems. The Meson MTest T953 experiment took beam all day. Evening shift: The Recycler stashed. Recycler experts conducted emittance studies and brought the old damper system online. MTest took beam until 6 PM. Saturday February 16 The midnight shift began with Operations monitoring store 5911 (93.86E30) and the stash (173.2E10), with Pbar stacking (37.7E10), and with NuMI and BNB taking beam. Midnight shift: The Recycler stashed. A Linac RF station (LRF2) tripped off twice and the 750keV area buncher tripped off. Day/Evening shift: MTest took beam. Operations terminated store 5911 and established store 5912 with an initial luminosity of 247.03E30. The Recycler stashed; there was an initial problem with transfers due to the switch to the old damper system caused by a device that was inadvertently turned off. LRF2 & 3 tripped off. Sunday February 17 The midnight shift began with Operations monitoring store 5912 and the stash, with Pbar stacking, and with NuMI and BNB taking beam. Midnight shift: MIRF2 tripped off several times and then operators bypassed the station. Around 4 AM all the TeV sector C2 vacuum pumps tripped off. Two TeV RF stations (TFR7&8) tripped off and caused store 5912 to abort. Operators investigated and found water leaking through the roof at F0 onto the RF stations. Day/Evening shift: MTest took beam. TeV experts conducted two wet squeezes. Operations put the TeV into shot setup, but before the store could be established, it quenched. The Recycler stashed. Monday February 18 The midnight shift began with Operations monitoring the stash, with Pbar stacking, and with NuMI and BNB taking beam. Midnight shift: The TeV quenched again at a number of A and B sectors during its first ramp. Since this was the second quench for A4, procedures required a nine-hour wait to let the leads to cool down. TeV experts accessed to inspect the lead flows. Day shift: The shift began with Operations monitoring the stash (268.0E10), with Pbar stacking (31.5E10), and with NuMI and BNB taking beam. MTest took beam. The C2 wet engine had failed and required an overhaul. The Recycler stashed. Booster and MI experts tuned and conducted studies. Evening shift: Cryo system experts completed the C2 wet engine work. TeV experts conducted a dry squeeze and orbit studies. Operations established store 5919 with an initial luminosity of 213.6E30. Recycler stashed. Recycler and MI experts accessed the MI tunnel to fill a kicker (KPS2A) with cooling fluid and to investigate a possible ground fault. MTest took beam until 6 PM. Tuesday February 19 The midnight shift began with Operations monitoring store 5919 (161.83E30) and the stack (140.1E10), with no Recycler stash due to the MI access, and with NuMI and BNB taking beam. Midnight shift: The MI turn on was slowed by a problem with a VCB for a quadrupole power supply at MI-30 and by a MIRF trip due to a LCW temperature problem. Then the MI turn on was further complicated when KPS2A tripped off again on a cooling fluid level indication. Experts access and drained the fluid from the kicker. Day shift: Recycler experts reported a leak on KPS2A and began repairs. Operators prepared Booster, BNB, Switchyard (SY), and NuMI for access. Later, Linac and Booster experts conducted studies. Evening shift: LRF5 studies lasted all shift. The MI access to repair KPS2A ended at 6:15 PM. Eventually, beam was reestablished to Booster, BNB, Pbar, NuMI, MTest, and Recycler. Wednesday February 20 The midnight shift began with Operations monitoring store 5919 (39.78E30), with no stash due to access, with Pbar stacking (174.8E10), and with NuMI and BNB taking beam. Midnight shift: Store 5919 was terminated at 6 AM. D0 accessed their collision hall. The 400MeV area in Linac began tripping off due to beam positions problems: experts investigated. Day shift: CDF and D0 were in access all shift. Experts replaced the 400 MeV area chopper power supply. Booster experts tuned. MTest took beam. Evening shift: CDF and D0 came out of access at 5 PM. TeV experts conducted studies all shift. MTest took beam until 5:15 PM. LRF3 caused some problems. Near midnight, Operations reported that Pbar set a new stack size record with 271.09 mA. Thursday February 21 The midnight shift began with TeV experts conducting studies, with no stash, with Pbar stacking (271.3E10), and with NuMI and BNB taking beam. Midnight shift: Experts investigated problems with a Lambertson (LAM61). MIRF3&4 tripped off; an expert adjusted the anode program for MIRF4. Operations halted NuMI beam and prepared MI-65 for an access. Day shift: TeV experts conducted studies all shift. NuMI experts began their access. Recycler experts reported that the substance used to repair the kicker leak was still curing. Booster and MI experts tuned their beamlines all shift. Evening shift: The stack reached another record-breaking size of 310mA. Recycler experts accessed MI, filled KPS2A, and checked for leaks. MI came back on and sent beam to Pbar. TeV experts continued with orbit studies. The Recycler stashed. Friday February 22 The midnight shift began with Operations monitoring the stash (190.9E10), with Pbar stacking (66.9E10), and with BNB taking beam. Midnight shift: Operations put the TeV through a wet squeeze. The Recycler stashed. Operations put the TeV into shot setup and established store 5924 with an initial luminosity of 149.97E30. NuMI remained off. Day shift: Pbar was down for some time due to the target station’s air pump failing. Experts replaced the unit and stacking resumed. NuMI remained off. Evening shift: NuMI remained off. The Recycler stashed. Booster experts tuned. Saturday February 23 The midnight shift began with Operations monitoring store 5924 (36.36E30) and the stash (325.5E10), with Pbar stacking (21.4E10), and with BNB taking beam. Midnight shift: Operations terminated store 5924 and established 5925 with an initial luminosity of 244.66E30. The Recycler stashed. NuMI remained off. Day/Evening shift: The Recycler stashed. LRF3 had a gradient problem and had to be left off for a short time. Operators tuned Booster. NuMI remained off. Operations terminated store 5925. D0 and CDF accessed their collision halls. Sunday February 24 The midnight shift began with Operations monitoring the stash, with Pbar stacking, and with BNB taking beam. Midnight shift: D0 and CDF came out of access. Operations established store 5927 with an initial luminosity of 276.64E30. The Recycler stashed. NuMI remained off. Day/Evening shift: The Recycler stashed. The Pelletron had some readback problems, but they were resolved. LRF3 tripped off due to a gradient regulation problem. NuMI remained off. Monday February 25 The midnight shift began with Operations monitoring store 5927 and the stash, with Pbar stacking, and with BNB taking beam. Midnight shift: Operations terminated store 5927 and put the TeV into shot setup. The next store quenched before it got established. Operators and experts investigated the cause for the quench. Pbar had some trouble due to BPM problems at house 30. The Recycler stashed. The Plans for Monday The plans for today are to conduct a wet squeeze and then establish a new store by noon. |
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