Difference between revisions of "Detectors"

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[[file:Mott_Logic.jpg|left|300px|]]
 
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* ΔE Detector PMT HV:
 
* ΔE Detector PMT HV:

Revision as of 16:21, 7 January 2014

Detectors

  • The detectors are described in the following POLOG Entry:

http://opweb.acc.jlab.org/CSUEApps/elog02/elog_item.php?elog_id=1542515

https://cebaf.jlab.org/elog/entry/1542515


Data Sheets

- The Acrylic Light Guide is 0.125 inch x 1 inch wide x 2 inch long (data sheet: media:Light_Guide.pdf).
- The Plastic Scintillator for the DE detector is an EJ-212 machine finish of the size 1 mm x 1 inch x 1 inch 
(data sheet: media:EJ-212.pdf).
- The Plastic Scintillator Rod for the E detector is an EJ-200 (data sheet: media:EJ-200.pdf) of the size 
3 inch diameter x 2.5 inch long painted with EJ-510 (data sheet: media:EJ-510.pdf) with one end clear.
- The 1-inch PMT is R6427 (media:PMT_R6427.pdf) in an H7415 Assembly.
- The 3-inch PMT is R6091 (media:PMT_R6091.pdf) in an H6559 Assembly.


Logic Setup

Mott Logic.jpg


  • ΔE Detector PMT HV:
LEFT -1000 V
RIGHT -1000 V
UP -1000 V
DOWN -1080 V


  • E Detector PMT HV:
LEFT -1125 V
RIGHT -1120 V
UP -1140 V
DOWN -1160 V


LEFT 1+2+8 ns
RIGHT 4+8 ns
UP 0.5+4+8 ns
DOWN 1+4+8 ns


LEFT -185 mV
RIGHT -189 mV
UP -185 mV
DOWN -186 mV


  • ΔE Detector 715 Constant Fraction Timing Discriminator Thresholds (media:715ds.pdf):

Shaping Delay = 2 ns

LEFT -25 mV
RIGHT -29 mV
UP -27 mV
DOWN -42 mV


  • E Detector 715 Constant Fraction Timing Discriminator Thresholds (media:715ds.pdf):

Shaping Delay = 4 ns

LEFT -25 mV
RIGHT -25 mV
UP -30 mV
DOWN -30 mV


Mott Electronics Logic Setup Procedure

  • Step 1: E and ΔE signal triggered from the E signal with a trigger threshold of -25 mV. PMT HVs are adjusted such that all signals are -200 mV.
EDE Raw Signals LEFT.jpg
EDE Raw Signals RIGHT.jpg
EDE Raw Signals UP.jpg
EDE Raw Signals DOWN.jpg



  • Step 2: E trigger gate (30 ns) and ΔE trigger gate (5 ns) triggered from E signal (with ΔE delays listed above).
EDE Disc Signals LEFT.jpg
EDE Disc Signals RIGHT.jpg
EDE Disc Signals UP.jpg
EDE Disc Signals DOWN.jpg