Difference between revisions of "ThermalBreakin"
From PREX Wiki
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[[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 21:05, 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!
- 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
- 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
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.
