Silicon drift chamber with extended energy range

Details Silicon drift chamber with extended energy range Silicon drift chamber with extended energy range

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4140..324l&link_type=abstract

Proc. SPIE Vol. 4140, p. 324-332, X-Ray and Gamma-Ray Instrumentation for Astronomy XI, Kathryn A. Flanagan; Oswald H. Siegmund;

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The requirement for future X-ray Astronomy instrumentation to exhibit a combination of good energy resolution and an extended energy range may be fulfilled by the development of a X ray detectors made from coupling a Silicon Drift Chamber (SDC), to a scintillation crystal. We report on such a detector made with an SDC of 3 mm diameter and using a Caesium Iodide [CsI(Tl)] scintillator. The radiation input window is located on the Si side of the assembly so than soft X-rays are directly detected by the SDC. This allows a minimum threshold of about 1 keV at 0 degrees Celsius to be obtained. The Silicon Drift Chamber acts also as a photodiode able to detect the scintillation light produced by the CsI(Tl), thus extending the energy range of such a device up to some MeV. The discrimination of events between these two detection layers is performed by using a pulse shape discriminator in order to differentiate between the different rise times of the collected charge. The detector concept is discussed on the basis of the results already achieved and the future developments foreseen.

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