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Title	Challenges in Simulating Beam Dynamics of Dielectric Laser Acceleration
Authors	U. Niedermayer, O. Boine-Frankenheim, T. Egenolf, E. Skär TEMF, TU Darmstadt, Darmstadt, Germany A. Adelmann, S. Bettoni, M. Calvi, M.M. Dehler, E. Ferrari, F. Frei, D. Hauenstein, B. Hermann, N. Hiller, R. Ischebeck, C. Lombosi, E. Prat, S. Reiche, L. Rivkin PSI, Villigen PSI, Switzerland R.W. Aßmann, U. Dorda, M. Fakhari, I. Hartl, W. Kuropka, F. Lemery, B. Marchetti, F. Mayet, H. Xuan, J. Zhu DESY, Hamburg, Germany D.S. Black, P. N. Broaddus, R.L. Byer, A.C. Ceballos, H. Deng, S. Fan, J.S. Harris, T. Hirano, Z. Huang, T.W. Hughes, Y. Jiang, T. Langenstein, K.J. Leedle, Y. Miao, A. Pigott, N. Sapra, O. Solgaard, L. Su, S. Tan, J. Vuckovic, K. Yang, Z. Zhao Stanford University, Stanford, California, USA H. Cankaya, A. Fallahi, F.X. Kärtner CFEL, Hamburg, Germany D.B. Cesar, P. Musumeci, B. Naranjo, J.B. Rosenzweig, X. Shen UCLA, Los Angeles, USA B.M. Cowan Tech-X, Boulder, Colorado, USA R.J. England SLAC, Menlo Park, California, USA E. Ferrari, L. Rivkin EPFL, Lausanne, Switzerland T. Feurer Universität Bern, Institute of Applied Physics, Bern, Switzerland P. Hommelhoff, A. Li, N. Schönenberger, R. Shiloh, A.D. Tafel, P. Yousefi University of Erlangen-Nuremberg, Erlangen, Germany Y.-C. Huang NTHU, Hsinchu, Taiwan J. Illmer, A.K. Mittelbach Friedrich-Alexander Universität Erlangen-Nuernberg, University Erlangen-Nuernberg LFTE, Erlangen, Germany F.X. Kärtner Deutsches Elektronen Synchrotron (DESY) and Center for Free Electron Science (CFEL), Hamburg, Germany W. Kuropka, F. Mayet University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany Y.J. Lee, M. Qi Purdue University, West Lafayette, Indiana, USA E.I. Simakov LANL, Los Alamos, New Mexico, USA
Abstract	Dielectric Laser Acceleration (DLA) achieves the high- est 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 acceler- ator on a silicon chip, which can accelerate electrons from below 100keV to above 1MeV with a gradient of at least 100MeV/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 tech- niques have been developed. We have also 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 simu- lation 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.
Funding	ACHIP is funded by the Gordon and Betty Moore Foundation (Grant No. GBMF4744). U.N. acknowledges German BMBF Grant No. FKZ:05K16RDB. B.C. acknowledges NERSC, Contract No. DE-AC02-05CH11231.
Paper	download MOPLG01.PDF [1.583 MB / 7 pages]
Slides	download MOPLG01_TALK.PDF [3.947 MB]
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Conference	ICAP2018
Series	International Computational Accelerator Physics Conference (13th)
Location	Key West, FL, USA
Date	20-24 October 2018
Publisher	JACoW Publishing, Geneva, Switzerland
Editorial Board	Volker RW Schaa (GSI, Darmstadt, Germany); Kyoko Makino (MSU, East Lansing, MI, USA); Pavel Snopok (IIT, Chicago, IL, USA); Martin Berz (MSU, East Lansing, MI, USA)
Online ISBN	978-3-95450-200-4
Received	20 October 2018
Accepted	24 October 2018
Issue Date	04 May 2019
DOI	doi:10.18429/JACoW-ICAP2018-MOPLG01
Copyright	Published by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.