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detectors [2013/10/17 10:52] pereira |
detectors [2013/10/17 11:00] pereira |
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===== Hodoscope ===== | ===== Hodoscope ===== |
A Cs(Na) hodoscope detector located downstream of the E1 scintillator is used to measure the total kinetic energy of implanted nuclei, allowing the identification of different charge states. An additional use recently tested is the measurement of isomer -rays emitted from implanted nuclei. | A Cs(Na) hodoscope detector located downstream of the [[Detectors#Plastic scintillators|E1 scintillator]] is used to measure the total kinetic energy of implanted nuclei, allowing the identification of different charge states. An additional use recently tested is the measurement of isomer gamma-rays emitted from implanted nuclei.\\ |
The hodoscope is composed 32 sodium-doped cession iodide, CsI(Na), scintillating 5.1 cm-thick crystals manufactured by ScintiTech. Each crystal is 5.1 cm-thick, has an active area of 7.6 cm × 7.6 cm, and is attached to a photomultiplier (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 CRDCs. The frontal and lateral sides of each crystal are covered with two 150-um thick layers of a white Teflon reflective material, to provide light shielding between the crystals. The photocathodes are connected to a CAEN N568B shaping amplifier, followed by an 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 CRDCs. The frontal and lateral sides of each crystal are covered with two 150-um thick layers of a white Teflon reflective material, to provide light shielding between the crystals. The photocathodes are connected to a CAEN N568B shaping amplifier, followed by an 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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