Difference between revisions of "ThermalBreakin"

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#* collimator temperatures (expect ~ W at 50uA)
 
#* collimator temperatures (expect ~ W at 50uA)
 
#* cold ladder temperatures
 
#* cold ladder temperatures
 +
# Post screen captures to the logbook
 +
# Note anything out of the ordinary
 +
# Don't hesitate to call RC for guidance
 
# If everything seems steady, go to 100 uA on Ca-40
 
# If everything seems steady, go to 100 uA on Ca-40
 
#* Follow steps from 1 above
 
#* Follow steps from 1 above
Line 20: Line 23:
 
#* collimator temperatures (expect ~330 W at 50uA)
 
#* collimator temperatures (expect ~330 W at 50uA)
 
#* cold ladder temperatures
 
#* cold ladder temperatures
# If everything seems steady, go to 100 uA on Ca-40
+
# If everything seems steady, go to 100 uA on Ca-48
 
#* Follow steps from 7 above
 
#* Follow steps from 7 above
 
<br><br>
 
<br><br>
 
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.
 
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.

Revision as of 20:08, 11 December 2019

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. Post screen captures to the logbook
  4. Note anything out of the ordinary
  5. Don't hesitate to call RC for guidance
  6. If everything seems steady, go to 100 uA on Ca-40
    • Follow steps from 1 above
  7. If everything seems steady, go to 150 uA on Ca-40
    • Follow steps from 1 above
  8. Assuming that everything went well with the Ca-40 target, continue with following steps
  9. Move to the Ca-48 target and ask for 50 uA
  10. Take data for 1 hour, carefully monitoring:
    • asymmetry widths
    • collimator temperatures (expect ~330 W at 50uA)
    • cold ladder temperatures
  11. If everything seems steady, go to 100 uA on Ca-48
    • 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.