Difference between revisions of "ThermalBreakin"

From PREX Wiki
Jump to: navigation, search
Line 1: Line 1:
 
[[Main_Page|<B>PREX Main</B>]]<< [[Information for Shift Takers]] << [[Shift Leader]] << [[HOW TOs]]
 
[[Main_Page|<B>PREX Main</B>]]<< [[Information for Shift Takers]] << [[Shift Leader]] << [[HOW TOs]]
 
<br><br>
 
<br><br>
Note: these instructions may change as we learn from the target.
+
Note: these instructions may change as we learn from the target operation.
<br>
+
<br><br>
 
<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>
 
<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>
<br>
+
<br><br>
 
# 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:
Line 15: Line 15:
 
#* Follow steps from 1 above
 
#* Follow steps from 1 above
 
# Assuming that everything went well with the Ca-40 target, continue with following steps
 
# Assuming that everything went well with the Ca-40 target, continue with following steps
# Move to the Ca-48 target  
+
# Move to the Ca-48 target
 +
# Take data for 1 hour, carefully monitoring:
 +
#* asymmetry widths
 +
#* collimator temperatures (expect ~ W at 50uA)
 +
#* cold ladder temperatures
 +
# If everything seems steady, go to 100 uA on Ca-40
 +
#* Follow steps from 1 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 20:05, 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. 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 1 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.