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 13:13, 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]