[Olympus] Disassembly of OLYMPUS Target

[Alexander Winnebeck]

Dear colleagues,

last night the target cell went up in temperature above our readout limit. DORIS was running at 140 mA, 10 bunches, and 4.5 GeV. Today, there should be the extreme test with 5 bunches and 140 mA, but we decided that this additional heating, without having the chance to monitor it, does not make sense. Therefore we decided to take out the target, replaced it with a piece of beam pipe, and put it in the hall. This enables us to investigate and improve the system in the mean time.
At the first glance it is looking like a deformation of the wake field  suppressors and/or target cell. A detailed investigation will be performed by Jim and Chris.
In parallel there are some efforts to calculate the wake field more precisely, so that we get some information what we could do to improve it.
We will install more temperature sensors in the target system as well to understand better what is going on.

The whole procedure today took less that 6 hours and went very smooth. During a service week in May/June there is a good chance to reinstall the target and test it in operation.

We have taken some nice data in the last week and learned quite a lot. Let's keep on going with the clear perspective to make OLYMPUS a successful experiment! 

Cheers,

Alexander


 
--
Dr. Alexander Winnebeck
winnebeck at mit.edu

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