ISA meeting

Week 39, Sept. 23, 1997.


Status of the ring: The beam conditions are approaching our standard from previous runs. The maximum stored current is now 172 mA, and the lifetime is >10 hours.
We are currently conducting some tests using a phase modulation of the RF frequency in order to distribute the electrons more evenly within each bunch, thus getting a lower local electron density, and hence an improved lifetime without any significant change in the optical characteristics of the radiation.

The 5th ESLS meeting in Lund last week went very well. YS presented ASTRID II, which was received very well. There are not many VUV beamlines available in Europe today, and ASTRID II will perform very well in that energy region, and can thus be expected to be very attractive to the international community. Several other, new projects were presented, but they are designed for higher energies, typically 2-3 GeV.

The SX-700 beamline is being made ready for the last experiment of this run, which will be made by PJM and his group from Copenhagen.

The Undulator beamline is still enjoying progress. The transmission is very good, and at the beginning of next week, the post focusing mirror will be mounted, such that tests can be made in the last week of this run.

The X-Ray Microscope is working very well, according to RM. The phase contrast modifications are being made now, and the first tests should be made later today.

Ring modifications: During the next shutdown (week 42-44), the new acceleration drift tube will be mounted. In addition, a dipole chamber in corner one will be modified to provide a larger window fore the laser people, plus two synchrotron radiation beam ports. These will point into the new hall. The last major change is, that the post accelerating tube in the laser section of straight section two will be moved 5 mm outwards in order to allow more space for the first turn of the injected beam.

Electron extraction beamline: This may again become active, since the group from NBI in Copenhagen may arrive before the end of this run. This facility is almost unique in the world, since it provides a continuous beam of 580 MeV electrons, which is well suited for testing high energy detectors, space physics instrumentation etc.

23/9 1997 NH + SPM