CAT Chat Minutes

August 20, 1999

Information and Follow-up Items

1. The air temperature control in LOM 433 is not consistent over a 24-hour period, esp. between the hours of 8:00 p.m. and 4:00 a.m. Can anything be done to moderate the air temperature?

The HVAC control program for the LOM was lost during the power failure. The correct program has now been restored, and proper temperature control should be re-established.

2. The undulator gap seems to be drifting more than normal at sector 5, leading to a considerable change in intensity. What could be causing this?

We have not been able to find any problem with the ID, which would cause the intensity change. We will continue to work with the CAT to try to identify the cause.

User Operations

The machine had been operating at about 99% availability during this week, until this morning when two trips occurred. Problems were associated with power supply setpoints. Currently we are experiencing rf problems. Hence we will be dumping the beam and switching the rf systems, which should take about 30 minutes.

General Information

Module A of the liquid nitrogen distribution system is undergoing tests. Module B is fully constructed and Module C will be installed during the first few weeks of September. The entire system is expected to be operational by November. The liquid nitrogen dewar pressure has been lowered to 51 psig in preparation for the distribution system.

Starting on September 21 until September 29 we will be in SOM. The fill pattern for this run will be:

Group 1:  6 consecutive bunches; 15 mA Group 2: 8 subgroups with 7 consecutive filled bunches in each subgroup; spacing between subgroups = 48.3 nsec 85 mA

The gaps between the groups will be 1.58 msec. Average lifetime is expected to be 30 hours. We will still continue with two fills per day.