Photon Beam and Tagger working group status report Richard Jones Catholic University Catholic University Glasgow University Glasgow University University of Connecticut University of Connecticut GlueX collaboration meeting, Newport News, Oct. 25-27, 2007
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Photon Beam and Tagger working group status report Richard Jones Catholic University Glasgow University University of Connecticut University of Connecticut.
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Photon Beam and Tagger
working group status report
Richard Jones
Catholic UniversityCatholic University
Glasgow UniversityGlasgow University
University of ConnecticutUniversity of Connecticut
Outline Overview of progress in FY07 Diamond R&D Tagger engineering design Fixed counter array design SiPM studies and microscope prototyping Active collimator tests in Hall B Goals for FY08 Manpower and budgets
Diamond R&D CLAS 20 micron diamond is badly warped
Is this a general problem at 20 microns, or just one bad one? Did it happen during thinning between 50 microns and 20 or
was this one warped earlier on? The curvature shows imprint of ink dots. Does the glue that
ties it to the mounting wires contribute to this strain? Further studies of thin diamonds are needed, but
The CLAS diamond was shattered during a remounting attempt GlueX needs its own collection of diamonds for study several new stones obtained by Ken Livingston from Element 6 assessment of new stones planned at CHESS next week
Development at UConn (undergrad thesis) underway to enable surface topology measurements with laser interferometry – mounting tests without X-rays!
Active collimator tests in Hall B signal strength excellent, ~3 x MC estimate – low E processes inner, outer peaks clearly seen, well matched asymmetric artifact peaks also seen: readout cables, connectors?
assess crystals on loan from Element 6, Mainz at CHESS order several slices cut and thinned for GlueX learn from BNL source group about chemical etching
Tagger engineering design send out 100% design package monitor design process at key stages