ICAP2018 - List of Keywords (acceleration)

Paper	Title	Other Keywords	Page
SUPAF08	Particle-in-Cell Simulation of a Bunched Electrons Beam Acceleration in a TE113 Cylindrical Cavity Affected by a Static Inhomogeneous Magnetic Field	electron, cavity, resonance, simulation	64
	E.A. Orozco UIS, Bucaramanga, Colombia J.R. Beltrán, J.D. González, V.E. Vergara UMAG, Santa Marta, Colombia
	Funding: Universidad Industrial de Santander vice-rectory of research and extension. Mobility program N° Application: 2349 The results of the relativistic full electromagnetic Particle-in-cell (PIC) simulation of a bunched electrons beam accelerated in a TE₁₁₃ cylindrical cavity in the presence of a static inhomogeneous magnetic field are presented. This type of acceleration is known as Spatial AutoResonance Acceleration (SARA). The magnetic field profile is such that it keeps the electrons beam in the acceleration regime along their trajectories. Numerical experiments of bunched electrons beam with the concentrations in the range 10⁸ -10⁹ cm^-3 in a linear TE₁₁₃ cylindrical microwave field of a frequency of 2.45GHz and an amplitude of 15kV /cm show that it is possible accelerate the bunched electrons up to energies of 250keV without serious defocalization effect. A comparison between the data obtained from the full electromagnetic PIC simulations and the results derived from the relativistic Newton-Lorentz equation in a single particle approximation is carried out. This acceleration scheme can be used to produce hard x-ray. Dugar-Zhabon, V. D., & Orozco, E. A. (2009).Physical Review Special Topics-Accelerators and Beams, 12(4), 041301. ** Dugar-Zhabon, V. D., & Orozco, E. A. (2017). (USA Patent: 9,666, 403 )
	Slides SUPAF08 [1.358 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-SUPAF08
About •	paper received ※ 21 October 2018 paper accepted ※ 27 January 2019 issue date ※ 26 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPLG01	Challenges in Simulating Beam Dynamics of Dielectric Laser Acceleration	laser, electron, focusing, experiment	120
	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
	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. 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.
	Slides MOPLG01 [3.947 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-MOPLG01
About •	paper received ※ 20 October 2018 paper accepted ※ 24 October 2018 issue date ※ 26 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAG01	Plasma Wakefield Start to End Acceleration Simulations From Photocathode to FEL With Simulated Density Profiles	plasma, electron, FEL, simulation	154
	A. Marocchino INFN/LNF, Frascati (Roma), Italy
	Plasma Wakefield acceleration is a promising new acceleration technique that profit by a charged bunch, e.g. an electron bunch, to break the neutrality of a plasma channel to produce a wake where a trailing bunch is eventually accelerated. The quest to achieve extreme gradient conserving high brightness has prompted to a variety of new approaches and techniques. Most of the proposed schemes are however limited to the only plasma channel, assuming in the vast majority of cases, ideal scenarios (e.g. ideal bi-gaussian bunches and uniform density plasma channels). Realistic start-to-end simulations from the photocathode to a FEL via a plasma accelerating section are a fundamental step to further investigate realistic scheme possibilities, the underlying physics and future applications. To remove ideal simplifications, the SPARC_LAB simulation team is simulating bunches from the photo-cathode and tracking them all the way to the plasma. Similarly, the density profiles, where bunches evolve and accelerate, are calculated with a magneto-hydrodynamic code. The density profile is imported into the particle in cell codes used to calculate the particle evolution within the plasma section. The use of a multitude of codes, involving different architectures, physical units and programming languages, made necessary the definition of code interfacing and pipe-processes to ensure a proper pipeline of tools that are traditionally used in different fields are do not often come across. By combining the different numerical codes (particle tracker, particle in cell, magneto-hydrodynamics and FEL codes) we could propose a first realistic start-to-end simulation from the photo-cathode to a FEL lasering for a possible upcoming Italian PWFA-FEL facility. Such a work is conducted with a great focus on code reliability and data reproducibility. The Italian PWFA experimental team uses a capillary to control and tailor the plasma density profile, we could perform preliminary code comparison and
	Slides MOPAG01 [34.540 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-MOPAG01
About •	paper received ※ 16 October 2018 paper accepted ※ 24 October 2018 issue date ※ 26 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPAF16	Analysis of the Beam Loss Mechanism During the Energy Ramp-Up at the SAGA-LS	power-supply, electron, storage-ring, data-acquisition	227
	Y. Iwasaki SAGA, Tosu, Japan
	The accelerator of the SAGA Light Source consists of 255 MeV injector linac　and 1.4 GeV storage ring. The accumulated electron beam current of the　storage ring is about 300 mA. The energy of　the electrons are raised up to 1.4 GeV in 4 minutes in the storage ring. At the moment of the　beam acceleration (the beam energy is lower than 300 MeV), the electron　beam is lost like the step function. The lost beam current is normally　about 5 mA to 30 mA. The beam loss at the energy ramp-up is not observed, when the beam current is lower than 200 mA. To understand the beam loss mechanism, which depend on the beam current, we developed high-speed logging system of 100 kHz for monitoring the beam current and the magnets power supplies using National Instruments PXI. We investigated the relationship between the beam loss and the betatron tune shifts. The tune shifts during the beam acceleration were analyzed from the measured data of the output current of the magnets power supplies by using beam tracking code of TRACY2. By adopting the new high-speed logging system, the time structure of the beam loss process was clearly observed. We will present the high-speed logging system developed for monitoring the beam current and the power supplies at this meeting. The results of the investigation to find the relationship of the beam loss and the tune shifts will be also shown.
	Slides TUPAF16 [1.286 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-TUPAF16
About •	paper received ※ 19 October 2018 paper accepted ※ 28 January 2019 issue date ※ 26 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

Particle-in-Cell Simulation of a Bunched Electrons Beam Acceleration in a TE113 Cylindrical Cavity Affected by a Static Inhomogeneous Magnetic Field

electron, cavity, resonance, simulation

64

E.A. Orozco
UIS, Bucaramanga, Colombia
J.R. Beltrán, J.D. González, V.E. Vergara
UMAG, Santa Marta, Colombia

Funding: Universidad Industrial de Santander vice-rectory of research and extension. Mobility program N° Application: 2349
The results of the relativistic full electromagnetic Particle-in-cell (PIC) simulation of a bunched electrons beam accelerated in a TE₁₁₃ cylindrical cavity in the presence of a static inhomogeneous magnetic field are presented. This type of acceleration is known as Spatial AutoResonance Acceleration (SARA)*. The magnetic field profile is such that it keeps the electrons beam in the acceleration regime along their trajectories. Numerical experiments of bunched electrons beam with the concentrations in the range 10⁸ -10⁹ cm^-3 in a linear TE₁₁₃ cylindrical microwave field of a frequency of 2.45GHz and an amplitude of 15kV /cm show that it is possible accelerate the bunched electrons up to energies of 250keV without serious defocalization effect. A comparison between the data obtained from the full electromagnetic PIC simulations and the results derived from the relativistic Newton-Lorentz equation in a single particle approximation is carried out. This acceleration scheme can be used to produce hard x-ray**.
* Dugar-Zhabon, V. D., & Orozco, E. A. (2009).Physical Review Special Topics-Accelerators and Beams, 12(4), 041301.
** Dugar-Zhabon, V. D., & Orozco, E. A. (2017). (USA Patent: 9,666, 403 )

Slides SUPAF08 [1.358 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-SUPAF08

About •

paper received ※ 21 October 2018 paper accepted ※ 27 January 2019 issue date ※ 26 January 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPLG01

Challenges in Simulating Beam Dynamics of Dielectric Laser Acceleration

laser, electron, focusing, experiment

120

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

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.
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.

Slides MOPLG01 [3.947 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-MOPLG01

About •

paper received ※ 20 October 2018 paper accepted ※ 24 October 2018 issue date ※ 26 January 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAG01

Plasma Wakefield Start to End Acceleration Simulations From Photocathode to FEL With Simulated Density Profiles

plasma, electron, FEL, simulation

154

A. Marocchino
INFN/LNF, Frascati (Roma), Italy

Plasma Wakefield acceleration is a promising new acceleration technique that profit by a charged bunch, e.g. an electron bunch, to break the neutrality of a plasma channel to produce a wake where a trailing bunch is eventually accelerated. The quest to achieve extreme gradient conserving high brightness has prompted to a variety of new approaches and techniques. Most of the proposed schemes are however limited to the only plasma channel, assuming in the vast majority of cases, ideal scenarios (e.g. ideal bi-gaussian bunches and uniform density plasma channels). Realistic start-to-end simulations from the photocathode to a FEL via a plasma accelerating section are a fundamental step to further investigate realistic scheme possibilities, the underlying physics and future applications. To remove ideal simplifications, the SPARC_LAB simulation team is simulating bunches from the photo-cathode and tracking them all the way to the plasma. Similarly, the density profiles, where bunches evolve and accelerate, are calculated with a magneto-hydrodynamic code. The density profile is imported into the particle in cell codes used to calculate the particle evolution within the plasma section. The use of a multitude of codes, involving different architectures, physical units and programming languages, made necessary the definition of code interfacing and pipe-processes to ensure a proper pipeline of tools that are traditionally used in different fields are do not often come across. By combining the different numerical codes (particle tracker, particle in cell, magneto-hydrodynamics and FEL codes) we could propose a first realistic start-to-end simulation from the photo-cathode to a FEL lasering for a possible upcoming Italian PWFA-FEL facility. Such a work is conducted with a great focus on code reliability and data reproducibility. The Italian PWFA experimental team uses a capillary to control and tailor the plasma density profile, we could perform preliminary code comparison and

Slides MOPAG01 [34.540 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-MOPAG01

About •

paper received ※ 16 October 2018 paper accepted ※ 24 October 2018 issue date ※ 26 January 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPAF16

Analysis of the Beam Loss Mechanism During the Energy Ramp-Up at the SAGA-LS

power-supply, electron, storage-ring, data-acquisition

227

Y. Iwasaki
SAGA, Tosu, Japan

The accelerator of the SAGA Light Source consists of 255 MeV injector linac　and 1.4 GeV storage ring. The accumulated electron beam current of the　storage ring is about 300 mA. The energy of　the electrons are raised up to 1.4 GeV in 4 minutes in the storage ring. At the moment of the　beam acceleration (the beam energy is lower than 300 MeV), the electron　beam is lost like the step function. The lost beam current is normally　about 5 mA to 30 mA. The beam loss at the energy ramp-up is not observed, when the beam current is lower than 200 mA. To understand the beam loss mechanism, which depend on the beam current, we developed high-speed logging system of 100 kHz for monitoring the beam current and the magnets power supplies using National Instruments PXI. We investigated the relationship between the beam loss and the betatron tune shifts. The tune shifts during the beam acceleration were analyzed from the measured data of the output current of the magnets power supplies by using beam tracking code of TRACY2. By adopting the new high-speed logging system, the time structure of the beam loss process was clearly observed. We will present the high-speed logging system developed for monitoring the beam current and the power supplies at this meeting. The results of the investigation to find the relationship of the beam loss and the tune shifts will be also shown.

Slides TUPAF16 [1.286 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-TUPAF16

About •

paper received ※ 19 October 2018 paper accepted ※ 28 January 2019 issue date ※ 26 January 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)