Difference between revisions of "Run Plan for Kaon LT Luminosity Scan"
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| − | Luminosity scans on | + | Luminosity scans on LH<sub>2</sub> and ''z''=1.5% RL C targets. |
== Goal == | == Goal == | ||
The electrons in the HMS will be used to monitor cryotarget boiling, while the positive polarity SHMS will be used to investigate the reliability of hadron tracking efficiencies at high rates. We will use three different targets: | The electrons in the HMS will be used to monitor cryotarget boiling, while the positive polarity SHMS will be used to investigate the reliability of hadron tracking efficiencies at high rates. We will use three different targets: | ||
| − | * standard 10cm | + | * standard 10cm LH<sub>2</sub> |
* C (''z''=1.5% RL) - maximum current 65uA | * C (''z''=1.5% RL) - maximum current 65uA | ||
* Al dummy - maximum current 40uA | * Al dummy - maximum current 40uA | ||
| Line 25: | Line 25: | ||
Rotate HMS to 12.50 degrees, everything else is unchanged. | Rotate HMS to 12.50 degrees, everything else is unchanged. | ||
| − | # ''P''<sub>HMS</sub> = -3.266 GeV/c ( | + | # ''P''<sub>HMS</sub> = -3.266 GeV/c (unchanged) |
# ''θ''<sub>HMS</sub> = 12.50 deg ('''NEW''') | # ''θ''<sub>HMS</sub> = 12.50 deg ('''NEW''') | ||
| − | # ''P''<sub>HMS</sub> = 6.842 GeV/c ( | + | # ''P''<sub>HMS</sub> = 6.842 GeV/c (unchanged) |
| − | # ''θ''<sub>HMS</sub> = 6.49 deg ( | + | # ''θ''<sub>HMS</sub> = 6.49 deg (unchanged) |
| − | # | + | # LH<sub>2</sub>target (unchanged) |
| − | === 1 - 70uA | + | === 1 - 70uA LH<sub>2</sub> === |
Revision as of 23:51, 14 October 2018
Luminosity scans on LH2 and z=1.5% RL C targets.
Goal
The electrons in the HMS will be used to monitor cryotarget boiling, while the positive polarity SHMS will be used to investigate the reliability of hadron tracking efficiencies at high rates. We will use three different targets:
- standard 10cm LH2
- C (z=1.5% RL) - maximum current 65uA
- Al dummy - maximum current 40uA
Initial Setup
- Set PS1 and PS3 DAQ rates to 1.5kHz, to give a total rate to disk of about 3kHz.
- Increase EDTM trigger rate to 10kHz, to ensure that after prescaling there are 10k-100k EDTM events per run.
- Ensure the raster is on (2x2)
During scan
- Monitor number of EDTM events: to ensure 10k-100k events/run
- Try to get runs with minimum of beam trips: In particular, there might be a high number of trips due to the SHMS diffusor ion chambers at this small angle when running above 50uA. MCC can fix this by selectively changing the thresholds in the offending chambers. See here for more info.
- Be wary of DC HV trips in SHMS: we are at a small angle, for some of the higher currents we will have to switch off the HV for the SHMS DCs
- Use the highest current we can get: If MCC can't reach a current, we take data at the highest current that they can reach instead. This might mean we need to skip the highest luminosity settings.
Sweep 1
0. Preparation
Rotate HMS to 12.50 degrees, everything else is unchanged.
- PHMS = -3.266 GeV/c (unchanged)
- θHMS = 12.50 deg (NEW)
- PHMS = 6.842 GeV/c (unchanged)
- θHMS = 6.49 deg (unchanged)
- LH2target (unchanged)
