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. | ||
| + | <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 |
| − | # | + | #* collimator temperatures (expect ~ W at 50uA) |
| − | # | + | #* cold ladder temperatures |
| − | # If everything seems | + | # If everything seems steady, go to 100 uA on Ca-40 |
#* Follow steps from 1 above | #* Follow steps from 1 above | ||
| − | # If everything seems | + | # 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 21:04, 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!
- Start with Ca-40 target at 50uA
- 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
- 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
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.
