ThermalBreakin

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PREX Main<< Information for Shift Takers << Shift Leader << HOW TOs

Note: these instructions may change as we learn from the target operation.

DO NOT EXCEED 100 uA on Ca-48 target without explicit instructions from the RC until further notice!

  1. Start with Ca-40 target at 50uA
  2. Take data for 1 hour, carefully monitoring:
    • asymmetry widths
    • collimator temperatures (expect ~ W at 50uA)
    • cold ladder temperatures
  3. If everything seems steady, go to 100 uA on Ca-40
    • Follow steps from 1 above
  4. If everything seems steady, go to 150 uA on Ca-40
    • Follow steps from 1 above
  5. Assuming that everything went well with the Ca-40 target, continue with following steps
  6. Move to the Ca-48 target
  7. Take data for 1 hour, carefully monitoring:
    • asymmetry widths
    • collimator temperatures (expect ~ W at 50uA)
    • cold ladder temperatures
  8. If everything seems steady, go to 100 uA on Ca-40
    • Follow steps from 7 above



Explanation: The calcium oxidizes very quickly, and the presence of oil residue or an oxide layer could affect the thermal contact/conductivity so we want to carefully ablate the surface layer and make sure that we have stable target conditions to avoid damaging it with high current.