=ALL ABOUT CRIB=
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Circuit and trigger

Circuits for SSD

For the standard Si detectors, we use

  • Preamplifiers (Physikalishe Nachweisgerate CATSA, Clear pulse 528A, Mesytec MPR-16)
  • Main amplifiers (Phys. Nach. MA8000, ORTEC 572)
  • Fast Amp. or TFA (Clear pulse 16ch Fast amp. 4056, ORTEC 474)
  • CFD (ORTEC 935)
  • Complex module (Mesytec MSCF-16, MUX-32)
  • ADC/TDC (LeCroy or SILENA 3351/3371, CAEN 775/785, CAEN V1190, Mesytec MADC32).

About 100 channels are available with the traditional target, and ~200 ch by using MUX-32 x 3.

Specs

Preamplifier (CATSA)

  • Maximum energy...200 MeV (3V)
  • Time constant...10 us
  • C = 1000 pF
  • R_load = 200M Ohm (common bias for 16 strips, effectively 12.5 MOhm)

Preamplifier (528A)

  • Time constant...2–10 us (customized)
  • R_load = 2–10 MOhm

Main Amplifier (MA8000)

  • Gain x 100 (1-10 or 10-100)
  • Shaping time...1 us

Circuits for PPAC

The following circuits are used for the PPACs.

  • ORTEC 8ch Fast Amp
  • Linear fan in/out
  • Philips 5-ch CFD
  • CAEN VME TDC

The anode signal is charge-inverted and used as the trigger. The position of the beam can be determined by the timing of the cathode signals (X1, X2, Y1, Y2), measured by the TDC.

Trigger

The triggers we can use in the standard circuits are:

  • F1 PPAC
  • F2 PPAC
  • F2 SSD
  • F3 PPAC A or B (called "beam")
  • SSD OR [OR of arbitrary channels of Si and other detectors]
  • (beam) AND (SSD OR) [PPAC-SSD coincidence]
  • beam/n [downscaled beam]
  • (beam/n) OR (beam AND SSD OR)

Questions:

  • What is the trigger for your measurement?