2011 Particle Accelerator Conference - List of Authors (Gong, C.)

Paper	Title	Page
TUP017	Conceptual Design for the ARIEL 300 keV Electron Gun	847
	C.D. Beard, F. Ames, S. Austen, R.A. Baartman, Y.-C. Chao, K. Fong, C. Gong, N. Khan, S.R. Koscielniak, A. Laxdal, R.E. Laxdal, C.D.P. Levy, D. Louie, J. Lu, L. Merminga, A.K. Mitra, D. Rowbotham, P. Vincent, D. Yosifov TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada C.K. Sinclair CLASSE, Ithaca, New York, USA
	The Advanced Rare Isotope Laboratory (ARIEL) at TRIUMF is a facility that will augment existing programs at ISAC. ARIEL was funded in July 2010. Products from the complementary methods of proton-driven and bremsstrahlung-driven fission will be available for nuclear and materials science. Equipment for the photofission driver is the subject of this paper: a high-intensity electron beam provided by a high-voltage electron source (or e-gun) will be accelerated in a superconducting linear accelerator, and guided to a γ-ray convertor and actinide target assembly. The electron source is a 10 mA 300 keV thermionic gun, with a control grid for modulation of the beam. This paper describes the conceptual design of the gun, and highlights some of the progress made in the engineering design. First beam from the gun is anticipated in early 2012.

TUOBN6	Production of 25 MeV Protons in CO2 Laser-Plasma Interactions in a Gas Jet	721
	D.J. Haberberger, C. Gong, C. Joshi, S. Tochitsky UCLA, Los Angeles, California, USA
	Funding: This work is supported by DOE grant DE-FG02-92ER40727 and NSF grant PHY-0936266 At the Neptune Laboratory at UCLA, we have developed a high-power CO2 MOPA laser system which produces world record multi-terawatt 10um pulses. The CO2 laser pulses consist of a train of 3ps pulses separated by 18ps, each with a peak power of up to 4TW and a total pulse train energy of ~100J. These relativistic laser pulses are applied for Laser Driven Ion Acceleration in an H2 gas jet operated around the critical density of 10¹⁹ cm^-3 for 10um light using the Target Normal Sheath Acceleration mechanism. The laser is focused into the gas jet reaching a normalized field strength of a₀~2 in vacuum. For these conditions, protons with a maximum energy of 25MeV and a narrow energy spread of ΔE/E < 1% are recorded. Initial analysis of these experimental results shows a stronger scaling of the proton energy than that predicted from the ponderomotive force, and highlights the importance of an accumulated effect of multiple CO₂ laser pulses lasting over 100ps. The temporal dynamics of the overdense plasma slab are probed with a picosecond 532nm pulse and the results will be discussed.

Paper

Title

Page

Conceptual Design for the ARIEL 300 keV Electron Gun

847

C.D. Beard, F. Ames, S. Austen, R.A. Baartman, Y.-C. Chao, K. Fong, C. Gong, N. Khan, S.R. Koscielniak, A. Laxdal, R.E. Laxdal, C.D.P. Levy, D. Louie, J. Lu, L. Merminga, A.K. Mitra, D. Rowbotham, P. Vincent, D. Yosifov
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
C.K. Sinclair
CLASSE, Ithaca, New York, USA

The Advanced Rare Isotope Laboratory (ARIEL) at TRIUMF is a facility that will augment existing programs at ISAC. ARIEL was funded in July 2010. Products from the complementary methods of proton-driven and bremsstrahlung-driven fission will be available for nuclear and materials science. Equipment for the photofission driver is the subject of this paper: a high-intensity electron beam provided by a high-voltage electron source (or e-gun) will be accelerated in a superconducting linear accelerator, and guided to a γ-ray convertor and actinide target assembly. The electron source is a 10 mA 300 keV thermionic gun, with a control grid for modulation of the beam. This paper describes the conceptual design of the gun, and highlights some of the progress made in the engineering design. First beam from the gun is anticipated in early 2012.

TUOBN6

Production of 25 MeV Protons in CO2 Laser-Plasma Interactions in a Gas Jet

721

D.J. Haberberger, C. Gong, C. Joshi, S. Tochitsky
UCLA, Los Angeles, California, USA

Funding: This work is supported by DOE grant DE-FG02-92ER40727 and NSF grant PHY-0936266
At the Neptune Laboratory at UCLA, we have developed a high-power CO2 MOPA laser system which produces world record multi-terawatt 10um pulses. The CO2 laser pulses consist of a train of 3ps pulses separated by 18ps, each with a peak power of up to 4TW and a total pulse train energy of ~100J. These relativistic laser pulses are applied for Laser Driven Ion Acceleration in an H2 gas jet operated around the critical density of 10¹⁹ cm^-3 for 10um light using the Target Normal Sheath Acceleration mechanism. The laser is focused into the gas jet reaching a normalized field strength of a₀~2 in vacuum. For these conditions, protons with a maximum energy of 25MeV and a narrow energy spread of ΔE/E < 1% are recorded. Initial analysis of these experimental results shows a stronger scaling of the proton energy than that predicted from the ponderomotive force, and highlights the importance of an accumulated effect of multiple CO₂ laser pulses lasting over 100ps. The temporal dynamics of the overdense plasma slab are probed with a picosecond 532nm pulse and the results will be discussed.