IPAC2016 - Table of Session: WEOAB (Contributed Orals, Particle Sources and Alternative Acceleration Techniques)

Paper	Title	Page
WEOAB01	Advanced Acceleration Mechanisms for Laser Driven Ions by PW-lasers	2082
	S.S. Bulanov, E. Esarey, Q. Jipresenter, W. Leemans, T. Schenkel, S. Steinke LBNL, Berkeley, California, USA
	Funding: This work was supported by LDRD funding from Berkeley Laboratory, provided by the Director, Office of Science, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. With the fast development of laser technology the energy of laser accelerated proton beams rose up to almost 100 MeV. The PW-class laser facilities that are being built right now or are already in operation, such as the Berkeley Lab Laser Accelerator (BELLA) Center, will offer peak intensities approaching 10²² W/cm². This will allow the development of a new generation laser ion accelerators for numerous applications. The integral part of this task is the investigation of the advanced acceleration mechanisms for laser driven ion beams that would allow for a high degree of control over the angular and energy distributions of ion beams, as well as the increase of the maximum ion energy. We will present recent theoretical and simulation results on three advanced acceleration mechanisms: (i) Directed Coulomb Explosion, (ii) Radiation Pressure Acceleration, and (iii) Magnetic Vortex acceleration*. Reference: S. S. Bulanov et al, Phys. Rev. E 78, 026412 (2008). S. S. Bulanov et al, Phys. Rev. Lett. 114, 105003 (2015). * S. S. Bulanov et al, Phys. Rev. STAB 18, 061302 (2015).
	Slides WEOAB01 [39.942 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEOAB01
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WEOAB02	Record Performance of SRF Gun with CsK2Sb Photocathode	2085
	I. Pinayev, Z. Altinbas, S.A. Belomestnykh, I. Ben-Zvi, K.A. Brown, J.C. Brutus, A.J. Curcio, A. Di Lieto, C. Folz, D.M. Gassner, M. Harvey, T. Hayes, R.L. Hulsart, J.P. Jamilkowski, Y.C. Jing, D. Kayran, R. Kellermann, R.F. Lambiase, V. Litvinenko, G.J. Mahler, M. Mapes, W. Meng, K. Mernick, R.J. Michnoff, T.A. Miller, M.G. Minty, G. Narayan, P. Orfin, D. Phillips, T. Rao, J. Reich, T. Roser, B. Sheehy, J. Skaritka, L. Smart, K.S. Smith, L. Snydstrup, V. Soria, Z. Sorrell, R. Than, C. Theisen, J.E. Tuozzolo, E. Wang, G. Wang, B. P. Xiao, T. Xin, W. Xu, A. Zaltsman, Z. Zhao BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. High-gradient CW photo-injectors operating at high ac-celerating gradients promise to revolutionize many sci-ences and applications. They can establish the basis for super-bright monochromatic X-ray and gamma-ray sources, high luminosity hadron colliders, nuclear- waste transmutation or a new generation of microchip produc-tion. In this paper we report on our operation of a super-conducting RF electron gun with a record-high accelerat-ing gradient at the CsK2Sb photocathode (i.e. ~ 20 MV/m) generating a record-high bunch charge (i.e., 2 nC). We briefly describe the system and then detail our experimental results.
	Slides WEOAB02 [28.500 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEOAB02
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WEOAB03	Photoemission Properties of LaB6 and CeB6 Under Various Temperature and Incident Photon Energy Conditions	2088
SUPSS038	use link to see paper's listing under its alternate paper code
	K. Morita, T. Katsurayama, T. Kii, K. Masuda, T. Murata, K. Nagasaki, T. Nogi, H. Ohgaki, S. Suphakul, K. Torgasin, H. Yamashita, H. Zen Kyoto University, Kyoto, Japan
	Recently, thermionic cathode materials such as LaB6, Ir5Ce and dispenser cathodes have been also used as photocathode since they have low work function, reasonably high quantum efficiency, and long lifetime,. However, the effect of cathode temperature and laser wavelength on quantum efficiency is known only for limited conditions. Although it is expected to be able to lengthen the required wavelength of photocathode drive laser by heating cathodes, laser with photon energy under the work function has not been tested. Revealing them enables us to design the cost minimum accelerators. In this research, photoemission properties of LaB6 and CeB6 with various excitation photon energies will be investigated under various temperatures of the materials. Those materials have similar work function, but CeB6 have one order of magnitude smaller Richardson constant than LaB6*. By comparing photoemission properties of these materials, impact of Richardson constant on the photoemission properties will be investigated. S. Thorin et al. Proc of FEL2009, 310 D. Satoh et al. Proc of IPAC2014, 679 * J.M. Lafferty, J. Appl. Phys. 22, (1951), 299
	Slides WEOAB03 [0.996 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEOAB03
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Paper

Title

Page

Advanced Acceleration Mechanisms for Laser Driven Ions by PW-lasers

2082

S.S. Bulanov, E. Esarey, Q. Jipresenter, W. Leemans, T. Schenkel, S. Steinke
LBNL, Berkeley, California, USA

Funding: This work was supported by LDRD funding from Berkeley Laboratory, provided by the Director, Office of Science, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
With the fast development of laser technology the energy of laser accelerated proton beams rose up to almost 100 MeV. The PW-class laser facilities that are being built right now or are already in operation, such as the Berkeley Lab Laser Accelerator (BELLA) Center, will offer peak intensities approaching 10²² W/cm². This will allow the development of a new generation laser ion accelerators for numerous applications. The integral part of this task is the investigation of the advanced acceleration mechanisms for laser driven ion beams that would allow for a high degree of control over the angular and energy distributions of ion beams, as well as the increase of the maximum ion energy. We will present recent theoretical and simulation results on three advanced acceleration mechanisms: (i) Directed Coulomb Explosion*, (ii) Radiation Pressure Acceleration**, and (iii) Magnetic Vortex acceleration***.
Reference:
* S. S. Bulanov et al, Phys. Rev. E 78, 026412 (2008).
** S. S. Bulanov et al, Phys. Rev. Lett. 114, 105003 (2015).
*** S. S. Bulanov et al, Phys. Rev. STAB 18, 061302 (2015).

Slides WEOAB01 [39.942 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEOAB01

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WEOAB02

Record Performance of SRF Gun with CsK2Sb Photocathode

2085

I. Pinayev, Z. Altinbas, S.A. Belomestnykh, I. Ben-Zvi, K.A. Brown, J.C. Brutus, A.J. Curcio, A. Di Lieto, C. Folz, D.M. Gassner, M. Harvey, T. Hayes, R.L. Hulsart, J.P. Jamilkowski, Y.C. Jing, D. Kayran, R. Kellermann, R.F. Lambiase, V. Litvinenko, G.J. Mahler, M. Mapes, W. Meng, K. Mernick, R.J. Michnoff, T.A. Miller, M.G. Minty, G. Narayan, P. Orfin, D. Phillips, T. Rao, J. Reich, T. Roser, B. Sheehy, J. Skaritka, L. Smart, K.S. Smith, L. Snydstrup, V. Soria, Z. Sorrell, R. Than, C. Theisen, J.E. Tuozzolo, E. Wang, G. Wang, B. P. Xiao, T. Xin, W. Xu, A. Zaltsman, Z. Zhao
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
High-gradient CW photo-injectors operating at high ac-celerating gradients promise to revolutionize many sci-ences and applications. They can establish the basis for super-bright monochromatic X-ray and gamma-ray sources, high luminosity hadron colliders, nuclear- waste transmutation or a new generation of microchip produc-tion. In this paper we report on our operation of a super-conducting RF electron gun with a record-high accelerat-ing gradient at the CsK2Sb photocathode (i.e. ~ 20 MV/m) generating a record-high bunch charge (i.e., 2 nC). We briefly describe the system and then detail our experimental results.

Slides WEOAB02 [28.500 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEOAB02

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WEOAB03

Photoemission Properties of LaB6 and CeB6 Under Various Temperature and Incident Photon Energy Conditions

2088

SUPSS038

use link to see paper's listing under its alternate paper code

K. Morita, T. Katsurayama, T. Kii, K. Masuda, T. Murata, K. Nagasaki, T. Nogi, H. Ohgaki, S. Suphakul, K. Torgasin, H. Yamashita, H. Zen
Kyoto University, Kyoto, Japan

Recently, thermionic cathode materials such as LaB6, Ir5Ce and dispenser cathodes have been also used as photocathode since they have low work function, reasonably high quantum efficiency, and long lifetime*,**. However, the effect of cathode temperature and laser wavelength on quantum efficiency is known only for limited conditions. Although it is expected to be able to lengthen the required wavelength of photocathode drive laser by heating cathodes, laser with photon energy under the work function has not been tested. Revealing them enables us to design the cost minimum accelerators. In this research, photoemission properties of LaB6 and CeB6 with various excitation photon energies will be investigated under various temperatures of the materials. Those materials have similar work function, but CeB6 have one order of magnitude smaller Richardson constant than LaB6***. By comparing photoemission properties of these materials, impact of Richardson constant on the photoemission properties will be investigated.
* S. Thorin et al. Proc of FEL2009, 310
** D. Satoh et al. Proc of IPAC2014, 679
*** J.M. Lafferty, J. Appl. Phys. 22, (1951), 299

Slides WEOAB03 [0.996 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEOAB03

Export •

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