General Meeting Agenda 1/18/17

DISCUSSION OF PRESENTATION DRAFTS

• NPS Meeting

• PbWO4 crystal measurements (Richard)
• PbWO4 alternative readout with photodiodes (Andres)

• Hall C Meeting

• Fpi from E12-09-011 (Salina)
• Aerogel detector update (Arthur)

• Major comments for all:

• include numbers on slides
• check spelling and symbols in tables and formulas
• check if graphs match text on the slide, e.g., Richard (Crytur slide), Andres (signal slides)
• optimize phrasing on summary/outlook slides

PMT MAGNETIC SHIELDING CONCEPT (Arthur)

• Re-did tests from December 2016 - results are same, but found small error in procedure that has now been corrected (what was assumed to be field read back was actually current input to coil)

• Reminder of shielding concept:

• Mu-metal shielding around PMT to shield transverse fields up to 25 Gauss
• 3 mm soft iron box around the calorimeter to shield any additional magnetic fields

• Test results:

• 500um mu-metal shielding around PMT is an effective solution for fields up to 25 Gauss

• even at 25 Gauss only lose 10% of the signal

• mu-metal shielding is not effective for axial fields - expected axial field at NPS is 0.5 Gauss (Earth's field)

• for fields > 2 Gauss lose considerable fraction of signal
• at fields ~17 Gauss lose basically all signal

• Conclusion: NPS PMT shielding concept has been shown to work well

AEROGEL DETECTOR (Arthur)

• Techs may be available to work on SP-11 tray cover in next two weeks
• Samip (U. Regina) expressed interest to help with installation of tiles in SP-11 tray
• SP-11 tray installation on list of priorities for this month

NEXT MEETING: WED 25 JANUARY 2017 (10:00 AM EST)