CAT Chat Minutes

October 11, 1996


Issues that require action and/or follow-up
1. Is it true that when currents are high there are more trips?

Yes, this is true. This is also the experience at the ESRF. The trips one encounters are from rf systems. If each of the rf systems carries a larger load (or current), the system might have a higher trip rate. In the coming weeks, the load on each rf station will be reduced to alleviate this problem.

2. Stability is better, is it possible that the beam may be more useable during commissioning? Can we do some steering?

Yes, you may use the beam during commissioning. Regarding steering, make the request and we will do it if we can.

3. There were two FE EPS trips on 19ID recently. Is there an understanding of these trips?

Electronic noise in an ion pump controller has been suspected as the cause of these trips. We plan to replace this controller on Monday, October 14, 1996.

4. If the beam is steered in one sector, does it influence the beam elsewhere?

Much of the steering is local and should not influence the beam position elsewhere. We needed to gather more data on this. Experience will tell us if we will have cross talk between sectors. When you see problems like this, please let the Floor Coordinators know; we need to be made aware of these interactions.

5. Custodial services have really become inconvenient with the new changes. We received better service before the changes were made. With these changes some items have disappeared.

It is important for APS to hear about this so that proper action can be taken. If you suspect that things are being stolen, let someone in the XFD Division Office know immediately. We in turn will call Lab security, and they will follow it up. We want this to be a user friendly facility.

6. Many of us fill liquid N2 into dewars on the dock. An automatic shut-off valve has been planned to be tested. Does this mean we would not have to stand and watch the filling if such a valve is used?

Yes, that is what it means. We are presently checking this out and will advise you when we have the prototype system tested to our satisfaction.

Information/Follow-up items
APS Operational Status Update:  Next week we are commissioning several stations. There has been a request from some users to do commissioning outside of the day shift. We are checking into the possibility of doing these in the evening hours. It is a possibility, and we are looking into it and will report on this soon. All the users may not prefer this.

We will use the contingency day (Friday) for shielding verification. We said we could go up to 2000 hours each day, but we may be finished earlier in the day on all of the verification days. We will let you know.

At 8:00 a.m. Monday, we will perform commissioning with 5 mA stored current for about 1-1/2 hours. The rest of the commissioning will be at 20 mA.