Difference between revisions of "ThermalBreakin"

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Note: these instructions may change as we learn from the target.
 
Note: these instructions may change as we learn from the target.
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<b><span style="color: red;">DO NOT EXCEED 100 uA on Ca-48 target without explicit instructions from the RC until further notice!</span></b>
  
 
# Start with Ca-40 target at 50uA  
 
# Start with Ca-40 target at 50uA  
 
# Take data for 1 hour, carefully monitoring:
 
# Take data for 1 hour, carefully monitoring:
## asymmetry widths
+
#* asymmetry widths
## collimator temperatures (expect ~ W at 50uA)
+
#* collimator temperatures (expect ~ W at 50uA)
## cold ladder temperatures
+
#* cold ladder temperatures
# If everything seems okay, 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
# If everything seems okay, go to 150 uA on Ca-40
+
# If everything seems steady, go to 150 uA on Ca-40
 
+
#* Follow steps from 1 above
 +
# Assuming that everything went well with the Ca-40 target, continue with following steps
 +
# Move to the Ca-48 target
 
<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 20:04, 11 December 2019

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

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



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.