ISA meeting

Week 10, March 3, 1998.


Status of the ring: Things are looking good! The beam lifetime is very good (20h at 150 mA, longer at lower currents), and our maximum current is gradually increasing. This morning we had 156 mA of accelerated current in the ring.
Yesterday, we investigated the effect of phase modulation of the RF. Besides the usually vertical excitation, which really increases lifetime, phase modulation gives 20-30% more. The effect will be further investigated by studying the bunch length in more detail using a fast photodiode.

Welcome to Philip Hofmann, who started work as a surface scientist at ISA yesterday. Philip is in room 522-122, tel. 3640.

Congratulations to SPM, who has won the EPS-IGA 1998 accelerator prize for the design of ELISA. In 1996 Jeff Hangst won the prize which is awarded bianually, so it seems that things are going well for accelerator physics in Aarhus!

The microtron is running well, but is still suffering from a possibly defective circulator in the RF-waveguide. A new circulator has been ordered, and once that is installed, we can hopefully increase the RF-power, thereby getting more current in each pulse.
When used with the positron beamline, the repetition frequence should be increased, and in order to make that possible, we must install cooling in the pulse transformer tank. NH will look at other necessary modifications.

The undulator beamline is running well. The first spectrum was measured yesterday, after which the undulator gap was adjusted slightly to optimize the intensity at the desired energy.

The SGM has been realigned, and now has a image size of 1 by 3 mm, SVH reports.

The SX-700: The Copenhagen group will finish their measurements on Friday, and Monday, the Odense group will take over.

The SGM-2: The grating problems have now been resolved, so everything is now under control, and should be ready in about two weeks.

The X-ray microscope is a very busy facility, and RM reports, that things are going well. Since the last modifications to beam position, the microscope has lost some intensity (about 30%), which perhaps could be regained by moving the microscope. RM is reluctant to do it now, since it would take up to a week without any guarantee of increased performance.

The new injection beamline will be discussed at a small meeting later this week with the purpose of freezing the design.

3/3 1998 NH+SPM