CAT Chat Minutes

July 7, 2000

Information and Follow-up Items

1. Does opening an ID cause beam motion?

When few of the ID's are moved simultaneous over a large gap range, there is a detectable beam motion.

2. Is beam motion due to ID's local to a sector?

The reported RMS beam motion is based on BPM's from all around the ring. At this time, both the real time feedback and the orbit control program correct the orbit globally.

3. This past Monday, custodial came in to LOM 433 and 434 to spray insecticide and unfortunately, sprayed the carpet. The fumes were unbearable and caused many of us to leave. Can we be informed next time of their schedule so this doesn't happen again?

The reiterated procedure is for custodial to inform the building manager with the planned schedule for spraying. We will then, in turn, inform the CATs.

 

User Operations

The reiterated procedure is for custodial to inform the building manager with the planned schedule for spraying. We will then, in turn, inform the CATs.

Top-up went well this past week. Storage ring current sagged by more than 1 mA for a total of six hours, due to both injector and storage ring problems. Only two faults occurred, which caused an additional two hours of downtime.

Rod presented a graph showing the beam motion. At one instance, the beam motion was noticeable. It was attributed to an ID being scanned while the shutter was closed with the direct cause being the auto gap opener script fighting with the beamline ID scanning script and resulting in 2-minute period perturbation. If users suspect beam motion, please provide information like time, direction and magnitude and frequency to the floor coordinator within 1 week. The high-speed sampling information of the BPMs is maintained for this length of time, and this information will facilitate the investigation into the cause.

On Monday, July 10, scheduled maintenance begins and will continue through July 27 followed by machine startup/studies until the start of the next user run on August 2.

 

General Information

Switchgear Maintenance - On July 15th, one of the switchgear will be shutdown for its triennial maintenance. This will begin at 6:30 am until 6:00 pm. All power, except for emergency power, will be off in Sectors 1, 2 and 3, LOM 431, metrology and deposition labs, and the mirror lab as well. This may cause interruptions to chilled water, process water and other utilities provided by building 450.