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SUMMARY:Development and test of a TDC and amplifier circuit for a multi-ch
 annel positron detector.
DTSTART;VALUE=DATE-TIME:20220828T114500Z
DTEND;VALUE=DATE-TIME:20220828T120000Z
DTSTAMP;VALUE=DATE-TIME:20220826T104817Z
UID:indico-contribution-3672@indico.stfc.ac.uk
DESCRIPTION:Speakers: Marta-Villa de Toro Sanchez (Centre for Molecular an
 d Materials Science\, TRIUMF – School of Physics and Astronomy\, The Uni
 versity of Edinburgh)\nIn a continuous beam muon facility positrons are de
 tected by relatively large plastic scintillators without position sensitiv
 ity. An idea has been proposed to make these positron detectors multi-chan
 nel and able to track the positron trajectories. This will ultimately enab
 le 2-dimensional magnetic imaging of the sample with the µSR technique. T
 o attain this “muon microscope” idea\, large numbers of independent ph
 otosensors with high-timing resolution will be necessary.\n\nOur group at 
 KEK has developed an amplifier-shaper-discriminator (ASD) circuit named FG
 ATI with 16 channels per chip and a high-resolution time to digital conver
 ter\, called HR-TDC with a timing resolution on the order of picoseconds. 
 Silicon photomultipliers (SiPMs) from Hamamatsu (MPPC) are employed to giv
 e electric pulses for the optical input [1-2]. We have been testing this n
 ew set-up at TRIUMF with a pulsed laser to understand the efficiency\, tra
 nsient response\, timing resolution\, and the data acquisition to a comput
 er. We are now successfully detecting the rising and falling edge timing a
 s well as the time-over-threshold (TOT) of the laser pulses.\n\nThe tested
  circuit will be a basis for the light detection and time recording from s
 cintillation fiber arrays to be used for the multi-channel positron detect
 ors. Multiple layers of such detectors will establish tracking the positro
 n trajectory and aid with the development of the “muon microscope”.\n\
 nThis work is partially supported by a Grant-in-Aid for Scientific Researc
 h (No.JP21H04666) from Japan Society for the Promotion of Science (JSPS).\
 n\nReference\n[1] K.M. Kojima et al\, JPS Conf. Proc.\, 21\, 011062 1-6\, 
 (2018).\n[2] K.M. Kojima et al\, J. Phys: Conf. Ser.\, 551\, 012063\, (201
 4).\n![enter image description here][1]\n![enter image description here][2
 ]\n\n\n  [1]: http://file:///Users/martadetoro/Desktop/Captura%20de%20Pant
 alla%202022-06-09%20a%20la(s)%209.30.54%20a.%20m..png\n  [2]: http://file:
 ///Users/martadetoro/Desktop/Captura%20de%20Pantalla%202022-06-09%20a%20la
 (s)%209.31.05%20a.%20m..png\n\nhttps://indico.stfc.ac.uk/event/53/contribu
 tions/3672/
LOCATION: Aula dei Cavalieri\, University Central Palace\, via Università
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URL:https://indico.stfc.ac.uk/event/53/contributions/3672/
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