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Title: Challenges in simulating beam dynamics of dielectric laser acceleration

Journal Article · · International Journal of Modern Physics A
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  1. Technische Universität Darmstadt, Institute for Accelerator Science and Electromagnetic Fields (TEMF), Schlossgartenstrasse 8, D-64289 Darmstadt, Germany
  2. Paul Scherrer Institut, CH-5232 Villigen, Switzerland
  3. Deutsches Elektronen-Synchrotron, D-22607 Hamburg, Germany
  4. Stanford University, Stanford, CA 94305, USA
  5. Technische Universität Darmstadt, D-64289 Darmstadt, Germany
  6. University of California, Los Angeles, CA 90095, USA
  7. Tech-X Corporation, Boulder, CO 80303, USA
  8. SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
  9. Center for Free-Electron Laser Science, DESY and University of Hamburg, D-22607 Hamburg, Germany
  10. Universität Bern, Switzerland
  11. Friedrich-Alexander Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
  12. Charles University, 12116 Prague 2, Czech Republic
  13. Purdue University, West Lafayette, IN 47907, USA
  14. Nat. Tsing Hua University, Taiwan
  15. Los Alamos National Laboratory, USA
+ Show Author Affiliations

Dielectric Laser Acceleration (DLA) achieves the highest gradients among structure-based electron accelerators. The use of dielectrics increases the breakdown field limit, and thus the achievable gradient, by a factor of at least 10 in comparison to metals. Experimental demonstrations of DLA in 2013 led to the Accelerator on a Chip International Program (ACHIP), funded by the Gordon and Betty Moore Foundation. In ACHIP, our main goal is to build an accelerator on a silicon chip, which can accelerate electrons from below 100 keV to above 1 MeV with a gradient of at least 100 MeV/m. For stable acceleration on the chip, magnet-only focusing techniques are insufficient to compensate the strong acceleration defocusing. Thus, spatial harmonic and Alternating Phase Focusing (APF) laser-based focusing techniques have been developed. Additionally, we have developed the simplified symplectic tracking code DLAtrack6D, which makes use of the periodicity and applies only one kick per DLA cell, which is calculated by the Fourier coefficient of the synchronous spatial harmonic. Due to coupling, the Fourier coefficients of neighboring cells are not entirely independent and a field flatness optimization (similarly as in multi-cell cavities) needs to be performed. The simulation of the entire accelerator on a chip by a Particle In Cell (PIC) code is possible, but impractical for optimization purposes. Finally, we have also outlined the treatment of wake field effects in attosecond bunches in the grating within DLAtrack6D, where the wake function is computed by an external solver.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
Gordon and Betty Moore Foundation; German Federal Ministry of Education and Research (BMBF); USDOE Office of Science (SC)
Contributing Organization:
ACHIP Collaboration
Grant/Contract Number:
AC02-76SF00515; GMBF4744; FKZ:05K16RDB; AC02-05CH11231
OSTI ID:
1608987
Journal Information:
International Journal of Modern Physics A, Vol. 34, Issue 36; Conference: 13.International Computational Accelerator Physics Conference (ICAP 2018), Key West, FL (United States), 20-24 Oct 2018; ISSN 0217-751X
Publisher:
World ScientificCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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Related Subjects

43 PARTICLE ACCELERATORS
dielectric
laser
accelerator
chip
ACHIP