SHMS Detector Packages: Hodoscopes Gabriel Niculescu JMU

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SHMS Detector Packages HodoscopesGabriel
NiculescuJMU

• SHMS Hodo-specs
• Design Status
• Procurement
• To do list

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The Big Picture
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SHMS HODO-SCOPESHMS HODO-SPECS

• Build SHMS hodoscopes first three scintillator
  planes (SX1,SY2,SX2) _at_JMU
• Acquire and test PMTs (XP2262) and bases
• Scintillator paddles procurement and testing
• 5x80mm BC408 paddles of assorted lengths
• Assembly of hodoscope paddles
• Mounting hodoscope in the SHMS detector frame
  (_at_JLab)

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Monte Carlo simulation
T. Horn, JLab
T. Horn, JLab
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(More) HODO design

• PMT XP2262 (88)
• Bases JLab design
• Scintillator BC408 (5x80 mm)
• Vendors Saint Gobain, Photonis

Detector dimensions and granularity based on
Monte Carlo simulations of the SHMS acceptance
- might change Slightly as design is finalized
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SHMS HODO Procurement

• Purchase(d) (Photonis)
• 15 new XP2262 tubes (remainder from Hall C
  storage (SOS upgrade??))
• 85 mu-metal shields
• PMT bases Use JLab design, contact electronics
  group
• Purchase scintillator material (S-G)

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JMU PMT/paddle Testing

• PMT
• High voltage scan
• Gain and gain stability
• Dark current/noise
• Paddles
• Light tightness
• JMU group is testing scintillators/PMTs for PCAL
  (CLAS12), and Minerva (FNAL)

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JMU Test Stand(work by Dillon Trelawny, Physics,
JMU)

• Dark box (six pack)
• VME-based DAQ
• Running Coda(lite)
• ROOT/C Analysis code
• It all works right now!

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JMU Test Stand pictorial
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More JMU SHMS hodoscope HODO- Testing

• As it says

XP2262B BC408 (50x13cm) Cs137
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To Do List/Timeline(shamelessly adapted from
01/08 review)
In progress

• FY08 buy PMTs, m-metal, and bases
• FY09 buy scintillator paddles
• FY08-09 test and assemble PMT-scintillator
  modules
• FY10 assemble hodoscope at Jefferson Lab
• FY13 Install detector package in SHMS