General Meeting Summary 12/21/16

GLUEX (Greg)

Transmittance measurements of cookies completed at CUA - consistent with previous measurements at JLab. Conclusion is that making cookies at a company is more efficient than making them at the university
Next test for feedback to company is radiation hardness with Xrays
DIRC focal plane measurements (addressing lens aberratiopns) ongoing at ODU - more on this next time
Transportation of BaBar boxes: test of a transportation concept will happen in mid-January

NPS: ALTERNATIVE PBWO4 CRYSTAL READOUT (Andres)

Adapted HPS prototype for measuring light yield with APD - got signals, but interpretation difficult without further information on light source (e.g., stability of LED, optimal voltage range).
Next: construct a setup based on the one from HPS, but with flexibility to have: 1) no crystal, 2) option to exchange APD/PMT for readout

Calibration of setup requires a calibrated light source and SEP range (if noise level too high, it will not be visible).
to find SEP, reduce the light intensity step-by-step by installing a filter after LED - if the peak observed is the SEP, it will first change only in amplitude as intensity is increased, and then as get more photoelectrons move to higher ADC channels
for checking capability of setup and assuming Gaussian distributions, ~1000 events are sufficient

CUA DETECTORS AT JLAB (Arthur, Hamlet, Vardan)

cover for SP-11 tray likely done this week
tray exchange in early 2017
SHMS software and electronics development/installation in progress - not yet ready
Action Item: develop commissioning plan for scheduled beam tests in March 2017 ff (two major components: 1) same techniques as for cosmic tests already done (trigger 3/4, different momenta, scintillator all or subset), 2) measurement with full tracking for studies of: effective area, position/momentum dependence, thresholds, impact of backgrounds

investigating tests with additional mu metal shielding
studies of if axial shielding is needed ongoing - if needed, this would be a major design change. Check the magnetic field maps - see NPS meeting agenda/summaries in Wiki
Action Item: repeat all measurements in January 2017

TIMELIKE COMPTON SCATTERING (Arthur, Vardan)

Met with Marie about proposal deadlines and what would be needed to meet them. Reconvene in early 2017.

DISCUSSION ABOUT TALKS AT UPCOMING MEETINGS

kaon experiment presentation: Salina on pions, Samip (U. Regina) on rate studies
aerogel detector presentation: TBD

NEXT MEETING: WED 4 JANUARY 10 AM( (EST)

Navigation menu