Simulating CCDs for the Chandra Advanced CCD Imaging Spectrometer

被引：54

作者：

Townsley, LK ^{[1
]}

Broos, PS ^{[1
]}

Chartas, G ^{[1
]}

Moskalenko, E ^{[1
]}

Nousek, JA ^{[1
]}

Pavlov, GG ^{[1
]}

机构：

[1] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2002年 / 486卷 / 03期

基金：

美国国家航空航天局;

关键词：

CCD; modeling; Monte Carlo simulation;

D O I：

10.1016/S0168-9002(01)02155-6

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We have implemented a Monte Carlo algorithm to model and predict the response of various kinds of CCDs to X-ray photons and minimally ionizing particles and have applied this model to the CCDs in the Chandra X-ray Observatory's Advanced CCD Imaging Spectrometer. This algorithm draws on empirical results and predicts the response of all basic types of X-ray CCD devices. It relies on new solutions of the diffusion equation, including recombination, to predict the radial charge cloud distribution in field-free regions of CCDs. By adjusting the size of the charge clouds, we can reproduce the event grade distribution seen in calibration data. Using a model of the channel stops developed here and an insightful treatment of the insulating layer under the gate structure developed at MIT, we are able to reproduce all notable features in ACIS calibration spectra. The simulator is used to reproduce ground and flight calibration data from ACIS, thus confirming its fidelity. It can then be used for a variety of calibration tasks, such as generating spectral response matrices for spectral fitting of astrophysical sources, quantum efficiency estimation, and modeling of photon pile-up. (C)2001 Elsevier Science B.V. All rights reserved.

引用

页码：716 / 750

页数：35

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