Unspecified Hugh Evans Profile

Hugh Evans

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 26 August 2024 Presentation + Paper

Toward more realistic quantification of ionizing radiation effects on ZERODUR spaceborne mirrors

Antoine Carré, Tony Hull, Bruno Delacourt, Hugh Evans, Janina Krieg, Thomas Westerhoff

Proceedings Volume 13100, 131000I (2024) https://doi.org/10.1117/12.3015381

KEYWORDS: Mirrors, Deformation, Particles, Space mirrors, Ion irradiation, Ionizing radiation, Telescopes, Monte Carlo methods, Electrons, Finite element methods

Read Abstract +

Dimensional changes of mirrors under spaceborne irradiation must be considered in the context of increasingly narrow tolerances. Among those factors impacting the optical figure, thermal transients are one of the main reason accounting for deformation, thus this is the reason why low CTE material (ZERODUR®) and/or heat diffusive material are exclusively considered for these applications. Radiation induced compaction can play a role in dimensional stability. This compaction effect is due to the local change of density induced by the collision of energetic particles (e.g. protons and electrons trapped in the Van Allen belt) with the mirror substrate. To address this perceived problem, we performed numerical evaluation of the irradiation levels expected over four different orbits (LEO, GEO, Sun Synchronous, L2) as seen by a ZERODUR® primary mirror. From these orbits, we then selected the harshest Earth-Orbiting conditions, namely those at GEO, and performed an equivalent lab-based e- and H+ irradiation. The effects of radiation induced deformation (compaction) onto the coupons have been then measured interferometrically for change. Finally, using our laboratory irradiation results and following a rigorous mechanical approach, we propose a upper bound for the expected deformation that would be expected with a baffled spaceborne lightweighted telescope. The negligible deformation derived in this study are consistent with decades of successful missions using ZERODUR® mirrors.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

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

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years