Spin-Reverse Program Progress

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Spin-Reverse Program Progress

• YAO,HUAN
• Temple University
• April 10, 2006

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Outline

• Conclusion on last meeting
• Main progress for spin-reverse program
• Example of one cell
• Summary

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Conclusion on last meeting
The polarization loss is pretty large 3. It
obviously has something wrong during spin flip.
Next step is to find the reason.
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Main progress
I found an important bug in the code which
doesnt turn off RF every time after flipping
spin. This is the main reason to kill the
polarization as I showed on last meeting.(see
next slide) I switch MGC Mode to AGC Mode for
RF power supply to avoid RF PS being off
automatically after one day.
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With RF
Without RF
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RF Power Supply Problem
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Example
Delta0.4/-0.1
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Spin-up Time8/-1.0hours480/-60min
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Spin-up Time8/-1.0hours480/-60min
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Estimation for Pe and Pn
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11.09/-0.50
10 Be
8.46/-0.50
10 Af
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10.56/-0.50
20 Be
20 Af
9.28/-0.50
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Summary

• Spin-Reverse Program Result is consistent with
  our expected value. So next we can either use
  this Labview code or implement it into EPICS
  system.
• Improve the interface to make people to
  understand well.

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Thanks

• Many thanks to JP, Zein-Eddine and all the people
  who help me finish this program.