Improved characterization of pulse height changes in the far ultraviolet detector of the cosmic origins explorer (COS)

David J. Sahnow; Christian I. Johnson

doi:10.1117/12.2677617

5 October 2023 Improved characterization of pulse height changes in the far ultraviolet detector of the cosmic origins explorer (COS)

David J. Sahnow, Christian I. Johnson

Author Affiliations +

Proceedings Volume 12678, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXIII; 126780W (2023) https://doi.org/10.1117/12.2677617
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

The FUV detector for the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope is a limited resource and must be managed carefully in order to prolong its life. This includes implementing multiple Lifetime Positions (LPs) in order to have spectra fall at different positions on the detector and adjusting the high voltage to minimize the extracted charge. The detector model used to predict how the gain evolves with time has become more sophisticated since launch and is used for both short and long-term planning. One limitation of the model is our incomplete understanding of how the response of a region on the detector is affected by factors such as the applied high voltage, shape of the pulse height distribution, modal gain, and previous usage. With more than fourteen years’ worth of data available for analysis, we can now improve our understanding of the effects of these items and enhance our predictive capabilities. We will discuss our investigation of how they affect the model and address the possibility that we may be able to recover data from heavily gain sagged regions of the detector.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

David J. Sahnow and Christian I. Johnson "Improved characterization of pulse height changes in the far ultraviolet detector of the cosmic origins explorer (COS)", Proc. SPIE 12678, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXIII, 126780W (5 October 2023); https://doi.org/10.1117/12.2677617

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