TeV experts began a study period at 11 AM while the Antiproton Source (Pbar) built up its stack.
Operations put the TeV through a dry squeeze at 2:08 PM.
TeV studies began at 2:58 PM.
Operations established a 12x0 TeV study-store at 5:04 PM.
Operations terminated the TeV store and established another 12x0 study-store at 8:48 PM.
Operation put the TeV into shot setup at 9:16 PM and established store 2923 at 11:15 PM. Its initial luminosity was 4.0E31. Pbar resumed stacking.
Tuesday August 19
At 4:28 AM, the TeV suffered at sector F4 quench. Two CAMAC crates in the D-zero (D0) experiment's electronics room lost power. Operators replaced the power supply for one of the crates. An expert wanted to come in and investigate the other crate.
Controls experts checked out the D0 crate problems. Operations restored the files for the devices in these crate at 7:35 AM and then ramped the TeV up to 980 GeV.
Operations made D0 ready for access at 9:41 AM. The experimenters were out of access thirty minutes later.
Operation put the TeV into shot setup at 1:16 PM.
At 3:35 PM, F17K3 pulled the abort again. Experts investigated.
A TeV RF station (TRF8) tripped off at 5:53 PM. This was the third time this station had sparked and tripped off during the day. Experts had been contacted for each trip.
At 6:09 PM, a Booster power supply (ORBMP) tripped off. Operators discovered a LCW leak in the power supply.
Booster experts had the ORBMP LCW leak repaired at 7:30 PM and began drying the supply. The experts discovered more ORBMP problems at 8:12 PM. They had the power supply running normally by 8:48 PM.
D0 experimenters accessed their collision hall at 8:35 PM.
Operations resumed sending beam to MiniBooNE at 8:51 PM.
TRF8 had its power amplifier tube changed and was up and running by 8:53 PM. At 9:08 PM, experts declared the station was operating normally.
D0 came out of access at 10 PM.
Operations put the TeV into shot setup at 11:32 PM.
Wednesday August 20
Operations established store 2928 at 1:07 AM with an initial luminosity of 4.2E31. Pbar resumed stacking.
At 1:31 AM, the TeV suffered a sector F4 quench. After much investigation, experts concluded that the quench was related to beam instabilities caused by misalignment of collimators. A separator also sparked at the beginning of the event; this spark was probably the root cause of the quench.
Operations put the TeV through a dry squeeze at 7:45 AM.
Comments and Suggestions
|last modified 8/20/2003 email Fermilab|