Difference between revisions of "Target density variation check"
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** Septum at nominal setting, no Sieve | ** Septum at nominal setting, no Sieve | ||
** Similar result shown in RHRS data as previous high current test | ** Similar result shown in RHRS data as previous high current test | ||
| − | ** Different distribution in LHRS is puzzling | + | ** Different distribution in LHRS is puzzling, might be related to DAQ problem |
| + | |||
| + | |||
| + | * Qsq runs 09/03/2019 | ||
| + | ** 400-500k events for LHRS and RHRS runs during Qsq measurements with various targets (Pb7, 8, 9, 10) | ||
| + | ** [https://logbooks.jlab.org/entry/3728471 HALOG run summary] | ||
| + | ** Consistency between LHRS and RHRS recovered for target #10 [https://userweb.jlab.org/~sanghwa/prex/running/dyn_dens3.pdf] | ||
Revision as of 14:13, 4 September 2019
- First measurement 09/02/2019
- HALOG summary
- Target #7 and #10 were checked for current range 5-70uA
- Septum mistuned on purpose in order to reduce rates, T2 trigger is used
- Sieve in
- Clear non-uniformity observed from degraded target (#10) compared to good (still in use) target (#7).
- More visible at higher current, but hint of similar signature of density rearrangement seen at low current.
- Consistent results from both LHRS and RHRS spot data
- Second measurement 09/03/2019
- HALOG summary
- Took high statistics run at very low current (30nA requested), Target #10
- Septum at nominal setting, no Sieve
- Similar result shown in RHRS data as previous high current test
- Different distribution in LHRS is puzzling, might be related to DAQ problem
- Qsq runs 09/03/2019
- 400-500k events for LHRS and RHRS runs during Qsq measurements with various targets (Pb7, 8, 9, 10)
- HALOG run summary
- Consistency between LHRS and RHRS recovered for target #10 [1]
