Hartmann wavefront measurements at FLASH

Barbara Keitel; Bernhard Flöter; Svea Kreis; Marion Kuhlmann; Klaus Mann; Tobias Mey; Elke Plönjes; Bernd Schäfer; Kai Tiedtke

doi:10.1117/12.2020850

3 May 2013 Hartmann wavefront measurements at FLASH

Barbara Keitel, Bernhard Flöter, Svea Kreis, Marion Kuhlmann, Klaus Mann, Tobias Mey, Elke Plönjes, Bernd Schäfer, Kai Tiedtke

Author Affiliations +

Proceedings Volume 8778, Advances in X-ray Free-Electron Lasers II: Instrumentation; 877814 (2013) https://doi.org/10.1117/12.2020850
Event: SPIE Optics + Optoelectronics, 2013, Prague, Czech Republic

Abstract

We report on online measurements of photon beam parameters during mirror alignment in the soft x-ray spectral region of FLASH, the free-electron laser in Hamburg. A compact Hartmann sensor operating in the wavelength range from 6 to 35nm was used to determine the wavefront quality of individual free-electron laser (FEL) pulses during the alignment procedure as well as aberrations. Beam characterization and alignment of beamline BL3 was performed with λ_13.5𝑛𝑚/ 116 accuracy for wavefront rms (W_𝑟𝑚𝑠). Second moment beam parameters are computed using a spherical reference wavefront generated by a 5μm pinhole. The Hartmann sensor was used for alignment of the ellipsoidal focusing mirror of beamline BL3, resulting in a reduction of (W_𝑟𝑚𝑠) by 33%.

Citation Download Citation

Barbara Keitel, Bernhard Flöter, Svea Kreis, Marion Kuhlmann, Klaus Mann, Tobias Mey, Elke Plönjes, Bernd Schäfer, and Kai Tiedtke "Hartmann wavefront measurements at FLASH", Proc. SPIE 8778, Advances in X-ray Free-Electron Lasers II: Instrumentation, 877814 (3 May 2013); https://doi.org/10.1117/12.2020850

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