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detectors [2019/04/09 14:24]
pereira [Cathode Readout Drift Chambers (CRDC)] |
detectors [2023/11/01 19:44]
swartzj |
| ====== Detectors ====== | ====== Detectors ====== |
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| The standard detection system of the S800 consists of a [[Detectors#Plastic scintillators|plastic scintillator]] at the [[Stations#Object Station|object station]]; two tracking detector at the [[Stations#Intermediate Plane Station|intermediate plane station]] ([[Detectors#Tracking Parallel Plate Avalanche Counters (TPPAC)|TPPAC]]) and a series of detectors at the [[Stations#Focal Plane Station|focal plane station]] (see figure below), which include two cathode readout drift chambers ([[Detectors#Cathode Readout Drift Chambers (CRDC)|CRDC]]) located about 1 m apart; a [[Detectors#Ionization Chamber|multi-segmented ionization chamber]], a thin [[Detectors#Plastic scintillators|plastic scintillators]] and a [[Detectors#Hodoscope|Hodoscope]]. | The standard detection system of the S800 consists of a [[Detectors#Plastic scintillators|plastic scintillator]] at the [[Stations#Object Station|object station]]; two tracking detectors at the [[Stations#Intermediate Plane Station|intermediate plane station]] ([[Detectors#Tracking Parallel Plate Avalanche Counters (TPPAC)|TPPAC]]) and a series of detectors at the [[Stations#Focal Plane Station|focal plane station]] (see figure below), which include two cathode readout drift chambers ([[Detectors#Cathode Readout Drift Chambers (CRDC)|CRDC]]) located about 1 m apart; a [[Detectors#Ionization Chamber|multi-segmented ionization chamber]], a thin [[Detectors#Plastic scintillators|plastic scintillators]] and a [[Detectors#Hodoscope|Hodoscope]]. |
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| {{:wiki:s800-fp-detectors.jpg?650|S800 detector station at the Focal Plane (figure taken from K. Meierbachtol PhD thesis, MSU, 2012).}} | {{:wiki:s800-fp-detectors.jpg?650|S800 detector station at the Focal Plane (figure taken from K. Meierbachtol PhD thesis, MSU, 2012).}} |
| The hodoscope is composed 32 sodium-doped cession iodide CsI(Na) scintillating crystals manufactured by [[http://www.scintitech.com/|ScintiTech]]. Each crystal is 5.1 cm-thick, has an active area of 7.6 cm x 7.6 cm, and is attached to a photomultiplier ([[https://www.hamamatsu.com/jp/en/R1307.html|Hamamatsu R1307]]). The photo-cathodes are made of a bi-alkali material with a transmission peak at 420 nm. The 32 crystals are arranged in eight rows of 4 crystals each so as to cover approximately the same solid angle than the [[Detectors#Cathode Readout Drift Chambers (CRDC)|CRDCs]]. The frontal and lateral sides of each crystal are covered with two 150-µm thick layers of a white Teflon reflective material to provide light shielding between the crystals. The photocathodes are connected to a [[https://groups.nscl.msu.edu/nscl_library/manuals/caen/MOD.N568B.pdf|CAEN N568B]] 16-channel shaper/amplifier, followed by a [[https://groups.nscl.msu.edu/nscl_library/manuals/phillips/7164H.pdf|Phillips 7164H]] 12-bit ADC. The signals from the crystals are gain-matched to a middle position in the ADC spectra by varying the biases of each photocathode. | The hodoscope is composed 32 sodium-doped cession iodide CsI(Na) scintillating crystals manufactured by [[http://www.scintitech.com/|ScintiTech]]. Each crystal is 5.1 cm-thick, has an active area of 7.6 cm x 7.6 cm, and is attached to a photomultiplier ([[https://www.hamamatsu.com/jp/en/R1307.html|Hamamatsu R1307]]). The photo-cathodes are made of a bi-alkali material with a transmission peak at 420 nm. The 32 crystals are arranged in eight rows of 4 crystals each so as to cover approximately the same solid angle than the [[Detectors#Cathode Readout Drift Chambers (CRDC)|CRDCs]]. The frontal and lateral sides of each crystal are covered with two 150-µm thick layers of a white Teflon reflective material to provide light shielding between the crystals. The photocathodes are connected to a [[https://groups.nscl.msu.edu/nscl_library/manuals/caen/MOD.N568B.pdf|CAEN N568B]] 16-channel shaper/amplifier, followed by a [[https://groups.nscl.msu.edu/nscl_library/manuals/phillips/7164H.pdf|Phillips 7164H]] 12-bit ADC. The signals from the crystals are gain-matched to a middle position in the ADC spectra by varying the biases of each photocathode. |
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| {{:wiki:hodoscope-drawing.jpg?500 |Schematic layout of the S800 Hodoscope.}} | {{:wiki:hodoscope-drawing.jpg?500 |Schematic layout of the S800 Hodoscope (figure taken from K. Meierbachtol PhD thesis, MSU, 2012).}} |
| {{ :wiki:hodoscope-picture.jpg?450|Backface of the S800 Hodoscope.}} | {{ :wiki:hodoscope-picture.jpg?450|Backface of the S800 Hodoscope (figure taken from K. Meierbachtol PhD thesis, MSU, 2012).}} |
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