Laboratory simulation of cosmic radiation effects on stressed Ge:Ga detectors at L2 and curing

Jutta M. Stegmaier; Stephan M. Birkmann; Ulrich Grözinger; Reinhard Katterloher; Oliver Krause; Dietrich Lemke

doi:10.1117/12.671128

14 June 2006 Laboratory simulation of cosmic radiation effects on stressed Ge:Ga detectors at L2 and curing

Jutta M. Stegmaier, Stephan M. Birkmann, Ulrich Grözinger, Reinhard Katterloher, Oliver Krause, Dietrich Lemke

Proceedings Volume 6265, Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter; 62652H (2006) https://doi.org/10.1117/12.671128
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

The Photodetector Array Camera and Spectrometer (PACS) is one of three science instruments on board the Herschel space observatory to be launched in 2008. It will perform imaging photometry and spectroscopy in the wavelength range from 57 μm to 210 μm. The integral field spectrometer contains two 25 x 16 pixel cameras of Gallium doped Germanium crystals (Ge:Ga). By stressing these crystals, cutoff wavelengths of 127 μm (low-stressed, 200 N) and 205 μm (high-stressed, 800 N) are reached. The characterization of these detectors (responsivity, noise equivalent power (NEP), dark current,...) is carried out at the Max-Planck-Institutes for Astronomy (MPIA, Heidelberg) and Extraterrestrial Physics (MPE, Garching). Both test facilities allow simulation of the in-flight operational conditions of the arrays and provide accurate IR fluxes by means of external/internal black bodies and calibrated cold attenuation filters. A radioactive 137Cs source is used at MPIA to simulate the steady cosmic radiation impact on the photoconductor arrays in order to study the radiation induced changes in responsivity, noise, and the transient behavior. The goal is to determine the optimal operating parameters (temperature, bias, integration time,..) for the operation at the L2 orbit, the best curing method, curing frequency and calibration procedure for high photometric accuracy. The "lessons learned" on operating, curing, deglitching and calibrating stressed Ge:Ga detectors during the ISO mission are applied as well as the relevant reports from IRAS and Spitzer.

Citation Download Citation

Jutta M. Stegmaier, Stephan M. Birkmann, Ulrich Grözinger, Reinhard Katterloher, Oliver Krause, and Dietrich Lemke "Laboratory simulation of cosmic radiation effects on stressed Ge:Ga detectors at L2 and curing", Proc. SPIE 6265, Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter, 62652H (14 June 2006); https://doi.org/10.1117/12.671128

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available