Difference between revisions of "ThermalBreakin"
From PREX Wiki
| Line 26: | Line 26: | ||
#* cold ladder temperatures | #* cold ladder temperatures | ||
# If everything seems steady, go to 100 uA on Ca-48 | # If everything seems steady, go to 100 uA on Ca-48 | ||
| − | #* Follow steps from | + | #* Follow steps from 8 above |
#* Note: they might not be able to deliver even 100 uA, so just run at the highest available current up to 100uA | #* Note: they might not be able to deliver even 100 uA, so just run at the highest available current up to 100uA | ||
<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 20:24, 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!
- Set SAM and quartz HVs for integration mode
- 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
- 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
- Follow steps from 2 above
- If everything seems steady, go to 150 uA on Ca-40
- Follow steps from 2 above
- Note: they might not be able to deliver 150 uA, so just run at the highest available current up to 150uA
- Assuming that everything went well with the Ca-40 target, continue with following steps
- Move to the Ca-48 target and ask for 50 uA
- Take data for 1 hour, carefully monitoring:
- asymmetry widths
- collimator temperatures (expect ~330 W at 50uA)
- cold ladder temperatures
- If everything seems steady, go to 100 uA on Ca-48
- Follow steps from 8 above
- Note: they might not be able to deliver even 100 uA, so just run at the highest available current up to 100uA
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.
