General Meeting Summary 10/19/16

DETECTOR UPDATES

• APD-based readout of PbWO4 (Andres, Rishabh, Richard)

• got feedback from Giessen Univ. group. See emails from Rainer Novotny and Stefan Diehl

• documentation for APD amplifier
• typical gain-voltage curve
• typical output of the APD amplifiers

• implemented Rainer/Stefan's suggestions and now see a signal
• to reduce background, would like to try tests with amplifier
• discussion about amplifier availability at JLab next week (Greg, TH, + 2ODU)

• Pixel detector update (Rachel)

• very busy, but making good progress
• will be overseeing the tracker integration (cylinders with tracker) - due to time constraints at other facilities some module/disk testing may have to be done as well

DIRC RECONSTRUCTION (Greg)

• Discussion about basic principles:

• translation of a segmented hit pattern into Cherenkov angle phase space - match track of event to look up table containing all possible combinations of photon being reflected, calculate likelihood
• (combinatorial) background from false tracks is a big concern - some of it alleviated by use of timing information
• reconstruction depends a lot on the expansion volume - most popular is the prism
• important considerations in DIRC construction: optical finishing of bars, alignment

• GlueX will use Babar DIRC bars

• four bars per box - optical coupling
• tests will be done on each box, but not bars separately - main concern is damage to optical glue as boxes have been used in previous experiments

• Example of software in MIT PhD thesis [ADD]

ITEMS FOR NEXT MEETING

• Analysis updates - postponed from today

• Kaon data analysis Jefferson Lab 6 GeV (Marco)
• Opportunities for pion form factor measurements with E12-09-011 (Salina)

NEXT MEETING: WED. 26 OCTOBER AT 10:00 AM (EDT)