[Olympus] First Olympus Test Experiment

[Alexander Winnebeck]

Dear colleagues,

today our first test beam time ended. Let me give you a short summary of what we have learned during this campaign:
- DORIS was successfully operated at 2.0 GeV with positrons and electrons. A maximum beam current of up to 75 mA was achieved. There is still some room for optimization, but it is looking very promising.
- The target system was working reliable. Count rates scale with hydrogen flow and beam current. The temperature stays in a modest range. Anyway, there are some ideas for optimization. To pump down the target after operation takes less than 15 minutes to reach the bottom of the 9 scale.
-  All detectors are operating. A nice elastic peak in the lead glass calorimeter and a angle correlation between lead glass and proton arm detector was observed. The MWPCs also came to operation and show a nice vertex distribution which is quite similar to the simulated one.

Tomorrow we have an extreme test of our target. The machine will switch to 5 bunches and 140 mA, which is really a challenge concerning the heating of the cell. Then we have to decide whether the target can stay in the ring, or has to be replaced by a piece of ordinary beam pipe.

In the next days we will start the analysis of the collected data and send you the results as soon as possible.

Best regards from the control room,

Alexander


--
Dr. Alexander Winnebeck
winnebeck at mit.edu

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