[Frost] The hydrogen contamination pf the carbon target in g9a data

[Park, Sungkyun]

Hi Eugene,

I made the presentation using the Keith pictures to have better understanding about the hydrogen contamination. I think this can be the good reference to discuss our current issue "hydrogen contamination in the carbon target"

  hadron.physics.fsu.edu/~skpark/document/FROSTM_Mar1313.pdf<http://hadron.physics.fsu.edu/%7Eskpark/document/FROSTM_Mar1313.pdf>

 In slide 1, the carbon and CH2 target in g9a vertex have shoulders downstream and there are new peak between carbon and CH2 target in g9b vertex. Our current conclusion may be the peak between the carbon and CH2 target is from the super-insulation and this super-insulation make the shoulder part in the carbon data. However, there is no description about the should of the CH2 target.

I think that (E)outer vacuum can, (D)20K heat shield, and (B)1K heat shield in Figure 3.6 in slide 1 are used in g9a and g9b together. I think the vertex difference between theg9a and g9b is from the holding magnet with the different size.
If so, we can not find any reason for the CH2 shoulder part  because the CH2 target is installed out the 20K heat shield.

Can I update this presentation on our FROST meeting web-page?

Sung
Florida State University
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