2nCor Equipment

From New IAC Wiki
Jump to navigation Jump to search

Detectors

PMTs

http://www.hamamatsu.com/resources/pdf/etd/R580_TPMH1100E.pdf

Scintillators

e+e- spectrometer

DAQ electronics

Signal Processing

Discriminator

CAEN N841


The pulse forming stage of the discriminator produces an output pulse whose width is adjustable in a range from 5 ns to 40 ns. Each channel can work both in Updating and Non-Updating mode according to on-board jumpers position. The discriminator thresholds are individually settable in a range from -1 mV to -255 mV (1 mV step), via an 8-bit DAC. The minimum detectable signal is -5 mV. The back panel houses VETO and TEST inputs, the OR output and the Current Sum output, which generates a current proportional to the input multiplicity, i. e. to the number of channels over threshold, at a rate of -1.0 mA per hit (-50 mV per hit into a 50 Ohm load) ±20%.

File:CAEN N841 Manual.pdf

NIM-ECL converter

Phillips Model 726

File:Phillip 726 Nim2ECL.pdf

TDC

Detector name convention

BLUT = Beam Left Upstream Top pmt

3/19/15

TDC channel Map (Thursday)
Detector Angle TDC channel NIM-ECL channel Patch Pannel # ROOT vaiable
BLUT 135 TDC 16 in B ch 0 223A6 evt.TDC[16]
BLUB 135 TDC 17 in B ch 1 223A7 evt.TDC[17]
BRT 270 TDC 24 in A ch 0 223A14 evt.TDC[24]
BRB 270 TDC 25 in A ch 1 223A15 evt.TDC[25]
BLDT 45 TDC 26 in A ch 2 223A16 evt.TDC[26]
BLDB 45 TDC 27 in A ch 3 223A17 evt.TDC[27]
Trig Delay TDC 30 in A ch 6 evt.TDC[30]
Photon flux monitor 90 TDC 29 in A ch 5 223A10 evt.TDC[29]

3/24/15

TDC channel Map 3/24/15
Detector Angle TDC channel LED channel NIM-ECL channel Patch Pannel # ROOT vaiable
1 top (BRT) 270 24 0 in A ch 0 223A5 evt.TDC[24]
1 bottom (BRB) 270 25 1 in A ch 1 223A6 evt.TDC[25]
2 top BLDT 45 16 2 in B ch 0 223A7 evt.TDC[16]
2 bottom BLDB 45 17 3 in B ch 1 223A8 evt.TDC[17]
3 top 60 26 4 in A ch 2 223A9 evt.TDC[26]
3 bottom 60 27 5 in A ch 3 223A10 evt.TDC[27]
4 top BLUT 135 18 6 in B ch 2 223A11 evt.TDC[18]
4 bottom BLUB 135 19 7 in B ch 3 223A12 evt.TDC[19]
5 upstream 135 20 10 in B ch 4 223A15 evt.TDC[20]
5 downstream 135 21 11 in B ch 5 223A16 evt.TDC[21]
6 upstream 135 30 12 in A ch 6 223A17 evt.TDC[30]
6 downstream 135 31 13 in A ch 7 223A18 evt.TDC[31]
e+ spect 29 9 in A ch 5 223A14 evt.TDC[29]
Trig Delay 22 14 in B ch 6 evt.TDC[22]


TDC calibration

Wiring Work

  • Sean and Glen examined all of the signals from detectors 1 through 6
  • We used the signal from the LEMO cables that go directly into the discriminator
  • We also used the scope's Acquire->Average option and set the average to 512; This allowed for a more reliable comparison between signals
    • Note that the threshold can be adjusted and that the average will be biased toward smaller pulse heights if there is a lot of noise
  • Found an RG-62 cable connected between the bottom PMT of Det 3 and the patch panel A10
    • Replaced with RG-58 cable
  • A10 cable also found to be RG-58 from the experiment room to the counting room; Signal on 3B was degraded in the control room
    • Changed to A19 (RG-223 the whole length) and the signal looked similar to the others
  • Found that detector 5 top and bottom both were small and have the ~12 ns ringing
    • Increased voltage to 1500V
    • The non-extending gates from the discriminator will help with this
    • Recommend a gate width of 20 to 25 ns from the discriminator to eliminate double pulsing from ringing on Det 5
    • Should not matter for other detectors
    • Will also not affect high energy neutrons since 6 MeV neutrons are 30 ns ToF at 1 meter

ADC

2nCor_44

Software

Ntuple maker

To make the Tree containing the TDC, QDC, and PDC data run the following command


source ~/CODA/setup
/home/daq/CODA/CODAreader/ROOT_V5.30/v775v792v785/evio2nt -fr8735.dat >/dev/null

rename the output file to a root file

mv r8735 r8735.root
root -l r8735.root

to draw a histogram for TDC channel 16

DAQ->Draw("evt.TDC[17]>>(4096,0,4096)");