ISA meeting

Status of the ring: We have started electron run 1/97 for the users yesterday, and things look good! During injection tests last week, up to 165 mA were accumulated, and 150 accelerated. The microtron is running well, and this morning we reached 100 mA in just a few minutes. We hit a ceiling at 150 mA, but are confident, that adjustments and fine tuning over the next injections will raise this ceiling.

The undulator chamber, which at the beginning caused a poor lifetime due to radiation induced out gassing, no longer poses a problem.

Lifetime at 145 mA this morning was over 10 hours.

During the tests last week, the undulator was closed to 35 mm gap to see the effect on the beam. Only a slight tune change was observed, but no position change. The gap will be closed further and changes to the beam investigated more closely as soon as time allows.

Welcome to Johnny Hansen, our new electrical engineer, who can be found in 525-327 with telephone number 3781. Johnny started work at ISA yesterday.

Ring injections will be made at fixed times this run: At 8:30 in the morning and at 16:15 in the afternoon. Please plan your work such that you do not have to be in the ring hall at these times. Injections can be expected to take about half an hour.

Radiation around the storage ring must be taken seriously when you move inside the fenced-in area. There is some radiation at known locations, especially very close to the undulator chamber. If you must work on the ring while we have an accelerated beam running, you must measure the local radiation level first. A demonstration of how to use our radiation monitoring equipment will be given by NH on Thursday at 13:00 in the ring hall.

When working close to the ring: ALWAYS wear your radiation film badge.

The undulator beamline should be ready in a few weeks. There is still some work to do replacing a damaged flange, but pumping should start in two weeks.

After that, we can start to position the beam in the undulator, if necessary. This will be done locally as much as possible , and beam position changes for the users will be kept to a minimum.

18/2 1997 NH + SPM