ISA meeting
Week 35, August 29, 2000.
Status of the ring: Our maximum stored current so far has been 206 mA, and generally we manage to store between 180 and 200 mA, so the ring has been
running very well. We have spent some time looking at our excitation frequencies and levels, in order to maximise lifetimes and stability of the beam. To
do this, we now continuously monitor the tunes of the beam, and whenever possible also monitor intensity fluctuations via a photodiode in the SGM II.
It was decided at the meeting to investigate the effect on the lifetime of our various excitation schemes individually and combined, since some experiments
benefit greatly from a reduced beam size. Our hope is to reduce the beam size without compromising the lifetime too much. We will try this tomorrow
morning (Wednesday) during the first hour after injection which means, that a 'normal' user beam will not be available until 10:00. See our status page for
details.
Monochromators: The initial absorption measurements at the UV1 look very good. Now, the CD part of the monochromator will be set up.
To reduce the intensity of second order radiation in the unduline, we yesterday accelerated a beam to 400, 450 and 500 MeV repectively. There is a
significant loss of first order intensity when running with a lower beam energy, but the ratio of 2nd to 1st order radiation could be reduced by a factor of
three.
The X-ray microscope is running well.
The LEED filament in the SGM I is burned out, and will be replaced.
The SX-700 also has some filament problems, and will be opened for repairs.
S.A.L.A. - "Synchrotrons, Accelerators and Laboratory Astrophysics" will be held at IFA during August 30 - September 1. See info on
http://www.isa.au.dk/sala/index.html.
29/8 2000 /
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