Detectors

Detectors

• The detectors are described in the following POLOG Entries:

https://logbooks/entry/1542515

https://logbooks/entry/1542519

https://logbooks/entry/1542529

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.

Old Logic Setup

• 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

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• ΔE Detector 792 Dual Delay Module (media:792ds.pdf):

LEFT	0.5+4+16+32 ns
RIGHT	0.5+1+2+16+32 ns
UP	1+2+16+32 ns
DOWN	0.5+2+16+32 ns

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• ΔE Detector 705 Octal Discriminator Veto Thresholds (media:705ds.pdf):

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

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New Logic Setup

The above is what we had in December 2013 and earlier. On Jan 13, 2014:

1- Adjusted HV such that signals of ΔE and E are -200 mV. FADC range = 0 to -500 mV, 0 to 212 = 4096. 
2- Set E thresholds = -25 mV.
3- Set ΔE thresholds = -25 mV.
4- Set the Veto thresholds to -450 mV.

• ΔE Detector PMT New HV:

LEFT	-1300 V
RIGHT	-1320 V
UP	-1230 V
DOWN	-1320 V

• E Detector PMT New HV:

LEFT	-1200 V
RIGHT	-1185 V
UP	-1220 V
DOWN	-1225 V

• ΔE Detector New Delays:

LEFT	16+32 ns
RIGHT	16+32 ns
UP	16+32 ns
DOWN	16+32 ns

• E and ΔE signal triggered from the E signal with a trigger threshold of -50 mV. PMT HVs are adjusted such that all signals are -200 mV.

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• E trigger gate (30 ns) and ΔE trigger gate (5 ns) triggered from E signal (with ΔE delays listed ) and the E-ΔE Coincidence signal.