CAT Chat Minutes

November 12, 1999

Information and Follow-up Items

1. A user called for an orbit correction early in the week. After a trip occurred, the orbit had to be recorrected, resulting in much lost time needed to realign all of the optics. Can notification be given when a BPLD is getting close to warning limits so that this doesn't happen again?

Yes, this will be reviewed with the staff so future similar situations are handled with this in mind.

2. The power to my insertion device beamline was inadvertently turned off. Is anything being done to prevent this from occurring again?

The power was accidentally turned off--work was being conducted at the adjoining sector and the wrong breaker was turned off. The distribution boxes are now being labeled with sector identification as another measure in preventing this from happening again.

User Operations

Rod Gerig, Associate Division for Accelerator Operations, presented the seven-day storage ring current and beamline operations history. He indicated that although availability was 94% for the week, there were 11-12 faults with a mean time to beam failure of 14 hours, which doesn't meet performance goals. Gerig reviewed the faults, noting there is a common theme of communication problems with IOCs. The accelerator staff is carefully evaluating each fault looking for repeat signatures to help identify the source of the problems.

Next week, machine studies will begin Monday, Nov. 15 at 8:00 a.m. and end Wednesday, Nov. 17 at 8:00 a.m. On Monday, a special test will be conducted at 8:00 a.m. to evaluate high emittance lattice in the booster. The user community is asked to leave their FOE shutters open, if possible, from 8:00-8:30 a.m. There could be some beam motion during the test, so experiments sensitive to such motion should not continue to collect data. An audible announcement will be made in addition to noting the test on the T.V. screens.

General Information

Custodial coverage on the experiment hall floor and in the LOMs will shift to a straight daytime shift starting Monday, Nov. 22.

The APS stockroom currently has no chemicals in stock. The usual selection of acetone and various alcohols will be re-ordered next week. ANL is currently switching to a new chemical tracking system and there has been some lag in linking the APS stockroom into the system.

A new Health Physics routine will begin shortly. Waste accumulated in controlled areas will be scanned for potential contamination before being placed in the general disposal containers.

The centralized liquid nitrogen system is now completely installed, and several sectors are using module A. Although the installation deadline has been met, the subcoolers in the modules have failed due to leaks and must be removed and sent back for repair to the manufacturer. The vendor is optimistic that repaired units will be back before the holidays for testing. At some point in time, the subcooler in module A will have to be removed, forcing the sectors served by module A to resort to dewars. It is possible that the module A work can be done during the April shutdown to minimize the impact on user operations.

John Quintana informed the group that Jerry Cohen, the visionary who brought DND-CAT into being and was responsible in many ways for the development of the APS, died of a heart attack last Sunday. A memorial book has been set up at sector 5, and people are encouraged to inscribe memories and thoughts in it. After some months, the book will be presented to the family.

Susan Strasser read a note from Gopal Shenoy thanking the users at the APS for their support and well wishes for his speedy recovery.