CAT Chat Minutes

March 1, 2004

General Information
Machine Stats R. Klaffky: Listing of Statistics for Run 1-2004 (created Monday, March 1, 10:06:11 CST 2004)

Delivered beam: 633.07 hrs.
   Percentage of scheduled time: 96.79%
   Downtime during period: 20.99 hrs.
   Mean time between faults (MTBF): 57.55 hrs.

Faults:

# 22 02/25 08:00 To 02/29 21:31 109.51	S20DBPLD trip [DIA]	7.35 Investigation ongoing, top-up resumed
# 24 03/01 04:52 To 03/01 08:05 3.22	RTFB problem [DIA]	1.99 S23/25 Reflective memory problem, booster vacuum

Beamline Downtime: Summary period 2/20-26/2003

Number	Date	Time	Description	Downtime	Group	Resolution
000347	2/20/04	08:37	Water leak into monochromator	4:56	Beamline	Repair of beamline water line
000352	2/21/04	07:53	BLEPS trip. User was not present to report the trip until 10:51.	3:00	Beamline	User notified beamline personnel, and the fault
000348	2/21/04	18:07	Vacuum leak in downstream shutter	39:26	Beamline	Repair by beamline personnel; replacement of limit switches and revalidation by PSS

Beamline Troubleshooting G. Goeppner : George summarized events related to the booster vacuum problem. A pressure rise to 10-4 torr in approximately 15 meters of the booster, closed vacuum valves and suspended APS operations. The affected area was divided into two sections of ~8 meters each for leak checking. The upstream section was determined to be leak tight at the time of the meeting. There were five diagnostic assemblies in the affected sections; two were determined to be leak tight at the time of the meeting. Estimated completion of the work was given as 6-7 hours before turning over to operations staff to set up for operations at 8 am ions , best case scenario. (The problem was eventually determined to be a water cooling tube in a horizontal scraper. The scraper assembly was removed and the booster turned over to operations staff at around 9:00 p.m. to condition the booster with beam and to prepare orbit for operation with 324 bunches.)

Users commented that the lines of communication throughout the RTFB problems , were lacking. Can there be a line or two of additional information appearing on the monitors apprising experimenters of beam status? Can information be provided at a quicker rate? Roger said he would look into this and agreed with Users that information should be shared with user groups and as quickly as possible. Roger will send cat-net email that will update beam status current information concerning operations tomorrow.

Safety E. Chang: A three-person team consisting of Bruce Murdoch, Eric Turnquist, and John Houck will be reviewing APS lasers during March 15-19, 2004. There was concern expressed regarding speeding traffic, please remember to limit speed to not exceed a fast walking pace. The safety inspections will take place in buildings 434-435 during March, 2004.