Preliminary results of pixel detector development for X-ray, and low energy gamma-ray all-sky monitor (AXGAM)
H. Ogelman,R.J. Paulos
V.V. Souchkov,T.O. Tumer,J. Zweerink
New, high spatial resolution CdZnTe (CZT) and Silicon (Si) pixel detectors
are strongly suitable for X-ray astronomy. These detectors are planned for
use in wide field of view, imaging, X-ray and low energy gamma-ray, all-sky
monitor (AXGAM) in a future space mission. The high stopping power of CZT
detectors combined with low-noise front-end readout makes possible an order
of magnitude improvement in spatial (angular) and energy resolution in X-ray
detection. AXGAM will be built in the form of a fine coded aperture placed over
a two-dimensional, high spatial resolution and low energy threshold CZT pixel
detector array. Progress in pixel detector development for AXGAM will be presented.
First the structure of the pixel detector signal processor will be discussed in
detail. The characteristics of the Application Specific Integrated Circuit (ASIC)
for AXGAM front-end will be presented and the developed test system for pixel
detector will be outlined. Electronic aspects limiting pixel detector resolution
will be discussed using an example of AXGAM pixel detector. Preliminary results of
pixel detector readout tests will be presented, and the design of a CZT detector
prototype for AXGAM will be sketched. The recent results obtained with CZT and Si
pixel detector prototypes with the developed readout system will also be presented.
File translated from TEX by TTH, version 2.32.
On 16 Jul 1999, 09:18.