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Title: Model-independent tuning for maximizing free electron laser pulse energy

Abstract

The output power of a free electron laser (FEL) has extremely high variance even when all FEL parameter set points are held constant because of the stochastic nature of the self-amplified spontaneous emission (SASE) FEL process, drift of thousands of coupled parameters, such as thermal drifts, and uncertainty and time variation of the electron distribution coming off of the photo cathode and entering the accelerator. In this work, we demonstrate the application of automatic, model-independent feedback for the maximization of average pulse energy of the light produced by free electron lasers. We present experimental results from both the European x-ray free electron laser at DESY and from the Linac Coherent Light Source at SLAC. We demonstrate application of the technique on rf systems for automatically adjusting the longitudinal phase space of the beam, for adjusting the phase shifter gaps between the undulators, and for adjusting steering magnets between undulator sections to maximize the FEL output power. We show that we can tune up to 105 components simultaneously based only on noisy average bunch energy measurements.

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [4];  [4];  [4];  [4];  [4]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. European X-ray Free-Electron Laser (XFEL), Hamburg (Germany)
  4. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany).
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1560628
Alternate Identifier(s):
OSTI ID: 1565872
Report Number(s):
LA-UR-19-28840
Journal ID: ISSN 2469-9888; PRABCJ
Grant/Contract Number:  
AC02-76SF00515; 89233218CNA000001
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 22; Journal Issue: 8; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Scheinker, Alexander, Bohler, Dorian, Tomin, Sergey, Kammering, Raimund, Zagorodnov, Igor, Schlarb, Holger, Scholz, Matthias, Beutner, Bolko, and Decking, Winfried. Model-independent tuning for maximizing free electron laser pulse energy. United States: N. p., 2019. Web. doi:10.1103/physrevaccelbeams.22.082802.
Scheinker, Alexander, Bohler, Dorian, Tomin, Sergey, Kammering, Raimund, Zagorodnov, Igor, Schlarb, Holger, Scholz, Matthias, Beutner, Bolko, & Decking, Winfried. Model-independent tuning for maximizing free electron laser pulse energy. United States. doi:10.1103/physrevaccelbeams.22.082802.
Scheinker, Alexander, Bohler, Dorian, Tomin, Sergey, Kammering, Raimund, Zagorodnov, Igor, Schlarb, Holger, Scholz, Matthias, Beutner, Bolko, and Decking, Winfried. Thu . "Model-independent tuning for maximizing free electron laser pulse energy". United States. doi:10.1103/physrevaccelbeams.22.082802. https://www.osti.gov/servlets/purl/1560628.
@article{osti_1560628,
title = {Model-independent tuning for maximizing free electron laser pulse energy},
author = {Scheinker, Alexander and Bohler, Dorian and Tomin, Sergey and Kammering, Raimund and Zagorodnov, Igor and Schlarb, Holger and Scholz, Matthias and Beutner, Bolko and Decking, Winfried},
abstractNote = {The output power of a free electron laser (FEL) has extremely high variance even when all FEL parameter set points are held constant because of the stochastic nature of the self-amplified spontaneous emission (SASE) FEL process, drift of thousands of coupled parameters, such as thermal drifts, and uncertainty and time variation of the electron distribution coming off of the photo cathode and entering the accelerator. In this work, we demonstrate the application of automatic, model-independent feedback for the maximization of average pulse energy of the light produced by free electron lasers. We present experimental results from both the European x-ray free electron laser at DESY and from the Linac Coherent Light Source at SLAC. We demonstrate application of the technique on rf systems for automatically adjusting the longitudinal phase space of the beam, for adjusting the phase shifter gaps between the undulators, and for adjusting steering magnets between undulator sections to maximize the FEL output power. We show that we can tune up to 105 components simultaneously based only on noisy average bunch energy measurements.},
doi = {10.1103/physrevaccelbeams.22.082802},
journal = {Physical Review Accelerators and Beams},
issn = {2469-9888},
number = 8,
volume = 22,
place = {United States},
year = {2019},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1 FIG. 1: A layout of the European XFEL is shown. The electron pulse enters on the left end, is accelerated to high energy and then used to create light at the right end at any one of three undulators. The laser’s output energy per bunch is measured after each undulatormore » at the end of the machine.« less

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