G 0 GMS Update S Pate NMSU G

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G 0 GMS Update S. Pate, NMSU G 0 Detector Working Group Meeting 17

G 0 GMS Update S. Pate, NMSU G 0 Detector Working Group Meeting 17 -July-1998 • hardware, costs, schedule, … • FPD/CED scenarios and how they “interface” to the GMS

GMS Schematic

GMS Schematic

Optics

Optics

Cluster Assembly Mechanical

Cluster Assembly Mechanical

Fiber Cluster Layout

Fiber Cluster Layout

Selector Mechanism

Selector Mechanism

Cost

Cost

Schedule Phase I -- Items needed to build and develop the system: laser, optics,

Schedule Phase I -- Items needed to build and develop the system: laser, optics, container, safety goggles, some fibers and connectors Phase II -- Items needed to complete the system: cluster assembly, balance of fibers and connectors, calibration source, masking system Oct 1998 Nov 1998 Jan 1999 Feb 1999 Mar 1999 May 1999 Jun 1999 Aug 1999 Start purchasing process on phase I Vendors actually receive PO's for phase I Delivery of Phase I items to NMSU Construct and test; Start purchasing for phase II Vendors receive PO's for phase II Delivery of phase II items to NMSU Test Delivery to JLab

FPD/CED Scenarios --- Comparisons Plan A Assumptions: • Front & Back FPD’s, & CED’s

FPD/CED Scenarios --- Comparisons Plan A Assumptions: • Front & Back FPD’s, & CED’s • Each scintillator gets a single fiber at its center • Back FPD light redirected to CED for electron running Notes: • Total configuration control • “Mean” timing and pulse height for offline setup • Little knowledge of source of any observed deviations over time

Plan B Assumptions: • Front & Back FPD’s, & CED’s • Each pair of

Plan B Assumptions: • Front & Back FPD’s, & CED’s • Each pair of FPD’s illuminated at both ends; each end has a single fiber which illuminates both scintillators • One side of FPD light redirected to CED for electron running Notes: • Monitor FPD gains and scintillator attenuation separately • No center spine required in FPD mounting assembly • Asymmetric FPD GMS operation for electron running • No FPD can view every laser pulse and act as a monitor

Plan C Assumptions: • Front & Back FPD’s for protons; Hodo for electrons •

Plan C Assumptions: • Front & Back FPD’s for protons; Hodo for electrons • Each pair of FPD’s illuminated at both ends; each end has a single fiber which illuminates both scintillators • Each Hodo element gets one fiber Notes: • Monitor FPD gains and scintillator attenuation separately • No center spine required in FPD mounting assembly • Separate configuration control for FPD and Hodo • No FPD can view every laser pulse and act as a monitor