[Olympus] First test run of Olympus at DORIS

[Alexander Winnebeck]

Dear colleagues,

I am very happy to report that we successfully accomplished our first beam 
time with the Olympus experiment installed in the DORIS ring. 
After the roll-in in July and the final installations of the sub systems 
DORIS was started with 2 GeV positrons last Friday (August 5th). On Monday 
we switched to 4.5 GeV positrons in 5 bunches, which represents the worst 
case concerning wakefield heating. 
It turns out that the new designed target (cell, wakefield suppressors, 
cooling contact, supports etc.) does a very good job and it remains 
cold and stable. The temperature rises just by a few degrees. The maximum 
temperature increase on the cell of 25K was observed on the upstream end.
Due to this very good performance we decided to leave the target in the 
ring, allowing us to do more tests with the target until the data taking 
starts. Thanks to all the people making this happen!

The second major step was the commissioning of all detector sub systems. 
Detailed results should be presented in the upcoming weekly EVO meetings.

Overall it was a very successful campaign. Starting with the preparations 
and the roll-in, survey and fine tuning, the machine operation, as well as 
the detector commissioning. We would like to thank everyone - technicians, 
engineers, scientists, and students - for this marvelous start of Olympus.

Best regards,

Michael and Alexander


--
Dr. Alexander Winnebeck
winnebeck at mit.edu

Massachusetts Institute of Technology (MIT)
77 Massachusetts Avenue
Bldg 26 / Rm 441
02139 Cambridge, MA, USA
Tel: +1-617-253-3680

DESY
Bldg 66 / Rm 002
Notkestrasse 85
22603 Hamburg / Germany
Tel: +49-40-8998-6402