IPAC2011 - List of Authors (Nelson, S.D.)

Paper	Title	Page
WEPC043	Beam Transport in a Dielectric Wall Accelerator for Intensity Modulated Proton Therapy	2106
	Y.-J. Chen, D.T. Blackfield, S.D. Nelson, B. R. Poole LLNL, Livermore, California, USA
	Funding: This work performed under the auspices of the U. S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA2A27344. We are developing a compact dielectric wall accelerator (DWA) for intensity modulated proton therapy (IMPT) with a goal of fitting the compact proton DWA in a single room. To make the accelerator compact, the DWA needs to have a very high accelerating gradient. Also, beam transport in the DWA should be done with as few external lenses as possible. We have developed a transport scheme to transport the proton bunch in the DWA and to focus the charge bunch on the patient without using any external focusing lenses. The transport scheme would allow us change the proton beam spot size on the patient easily and rapidly. Results of simulations using 3-D, EM PIC code, LSP* will be presented. * G. J. Caporaso, Y-J Chen and S. E. Sampayan, Rev. of Accelerator Science and Technology, vol. 2, p. 253 (2009). ** Alliant Techsystems Inc., http://www.lspsuite.com/.

THPS087	Engineering Prototype for a Compact Medical Dielectric Wall Accelerator	3636
	A. Zografos, T. Brown, A. Hening, V. Joshkin, K. Leung, Y.K. Parker, H.T. Pearce-Percy, D. Pearson, M. Rougieri, J. Weir CPAC, Livermore, CA, USA R. Becker SSS, Gelnhausen, Germany D.T. Blackfield, G.J. Caporaso, Y.-J. Chen, S. Falabella, G. Guethlein, S.A. Hawkins, S.D. Nelson, B. R. Poole, J.A. Watson LLNL, Livermore, California, USA R.W. Hamm R&M Technical Enterprises, Pleasanton, California, USA
	Funding: Prepared by LLNL under Contract DE-AC52-07NA27344. The Compact Particle Accelerator Corporation has developed an architecture to produce pulsed proton bunches that will be suitable for proton treatment of cancers. Subsystems include a RFQ injection system with a pulsed kicker to select the desired proton bunches and a linear accelerator incorporating a High Gradient Insulator with stacked Blumleins to produce the required voltage. The Blumleins are switched with solid state laser driven optical switches that are an integral part of the Blumlein assemblies. Other subsystems include a laser, a fiber optic distribution system, an electrical charging system and beam diagnostics. An engineering prototype has been constructed and it has been fully characterized. Results obtained from the engineering prototype support the development of an extremely compact 150 MeV system capable of modulating energy, beam current and spot size on a shot to shot basis within the next two years. The paper will detail the construction of the engineering prototype and discuss experimental results. In addition, future development milestones and commercialization plans will also be discussed.

Paper

Title

Page

Beam Transport in a Dielectric Wall Accelerator for Intensity Modulated Proton Therapy

2106

Y.-J. Chen, D.T. Blackfield, S.D. Nelson, B. R. Poole
LLNL, Livermore, California, USA

Funding: This work performed under the auspices of the U. S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA2A27344.
We are developing a compact dielectric wall accelerator (DWA) for intensity modulated proton therapy (IMPT) with a goal of fitting the compact proton DWA in a single room*. To make the accelerator compact, the DWA needs to have a very high accelerating gradient. Also, beam transport in the DWA should be done with as few external lenses as possible. We have developed a transport scheme to transport the proton bunch in the DWA and to focus the charge bunch on the patient without using any external focusing lenses. The transport scheme would allow us change the proton beam spot size on the patient easily and rapidly. Results of simulations using 3-D, EM PIC code, LSP** will be presented.
* G. J. Caporaso, Y-J Chen and S. E. Sampayan, Rev. of Accelerator Science and Technology, vol. 2, p. 253 (2009).
** Alliant Techsystems Inc., http://www.lspsuite.com/.

THPS087

Engineering Prototype for a Compact Medical Dielectric Wall Accelerator

3636

A. Zografos, T. Brown, A. Hening, V. Joshkin, K. Leung, Y.K. Parker, H.T. Pearce-Percy, D. Pearson, M. Rougieri, J. Weir
CPAC, Livermore, CA, USA
R. Becker
SSS, Gelnhausen, Germany
D.T. Blackfield, G.J. Caporaso, Y.-J. Chen, S. Falabella, G. Guethlein, S.A. Hawkins, S.D. Nelson, B. R. Poole, J.A. Watson
LLNL, Livermore, California, USA
R.W. Hamm
R&M Technical Enterprises, Pleasanton, California, USA

Funding: Prepared by LLNL under Contract DE-AC52-07NA27344.
The Compact Particle Accelerator Corporation has developed an architecture to produce pulsed proton bunches that will be suitable for proton treatment of cancers. Subsystems include a RFQ injection system with a pulsed kicker to select the desired proton bunches and a linear accelerator incorporating a High Gradient Insulator with stacked Blumleins to produce the required voltage. The Blumleins are switched with solid state laser driven optical switches that are an integral part of the Blumlein assemblies. Other subsystems include a laser, a fiber optic distribution system, an electrical charging system and beam diagnostics. An engineering prototype has been constructed and it has been fully characterized. Results obtained from the engineering prototype support the development of an extremely compact 150 MeV system capable of modulating energy, beam current and spot size on a shot to shot basis within the next two years. The paper will detail the construction of the engineering prototype and discuss experimental results. In addition, future development milestones and commercialization plans will also be discussed.