Details

Autor(en) / Beteiligte

• Yamamoto, T.
• Osakabe, M.
• Isobe, M.
• Yoshimura, Y.
• Kumazawa, R.
• Mutoh, T.
• Watari, T.
• Takeiri, Y.
• Kaneko, O.
• Takahasi, C.
• Matsuoka, K.
• Kado, S.

Titel

An application of electrically cooled Si detector to fast neutral measurement on CHS

Ist Teil von

• Review of Scientific Instruments, 2001-01, Vol.72 (1), p.615-618

Erscheinungsjahr

2001

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A new type of fast neutral particle analyzer using Si diode cooled by Peltier module has been designed and developed. It is known that leak current in a solid-state detector is reduced by its use in low temperature. It is shown in this article that Peltier effect provides a very handy way of cooling the detector as long as a temperature around 0 °C is aimed at. The detector was easily cooled down to −1.6 °C and the performance of the detector was studied by the use of x/γ rays from 241 Am . The leak current was remarkably reduced as the detector is cooled improving energy resolution from 9.2 keV at room temperature to 4.3 keV at −1.6 °C. In addition, the lower detectable energy limit was expanded from 25 keV to 14 keV. A Si detector is also sensitive to visible light and x ray. Therefore, the detector of our “reference design” is furnished with an evaporated 1000-Å-thick aluminum layer to reduce the visible light and with a lead collimator to reduce the x ray. The detector was finally installed on the Compact Helical System device for a test of overall performance and an energy spectrum from a diagnostic neutral beam was successfully measured. This test was conducted without an Al layer and this result suggests a possibility of eliminating it.