5-10 May 2019
MedILS
Europe/Berlin timezone

The characteristics of Very High Energy Electron Beam in Laser Wakefield Accelerator for Cancer Therapy

Not scheduled
15m
MedILS

MedILS

Meštrovićevo šetalište 45 HR – 21000 Split Republic of Croatia

Speaker

Kyung-Nam Kim (Korea Electrotechnology Research Institute)

Description

A laser wakefield accelerator(LWFA)[1], which can be used to accelerate electrons by interaction between high-intensity laser pulse and plasmas, has the advantage to miniaturize the system size as it can obtain in a narrow region compared with conventional systems. The characteristics of the Very High Energy Electron(VHEE) beam in LWFA has attracted much interest because of its potential application such as ultrashort x-ray source, betatron radiation, and medical applications. In particula, many researchers have recently studied the efficiency of VHEE-based cancer treatment systems for the treatment of deep-sated tumors[2]. This result has reported that this system can minimizes damage to normal cells and efficiently remove cancer cells.
In Korea Electrotechnology Research Institute (KERI), we have studied the development of a compact cancer treatment system by 20 TW ultra-short high power laser based LWFA system[3]. In this study, electron beams with energy of 70 and 90 MeV were obtained by ionization injection from mixed gas, helium gas containing 10 % nitrogen, and the charge were 25, 18 nC, respectively. Three-dimensional Percent Dose Distribution(PDD) of electron beam was measured by tough phantom composed of Gafchromic films. The measured PDD shows the size-preserving shape of the electron beam, known as pencil-like beam, at high energy. For comparison with experimental results, "PDD" according to depth of penetration of electron beam was calculated using GEANT4 code. The experimental results and the calculated results were in good agreement. Significantly, because of the electron beam energy spread, the PDD at relatively shallow depths, such as neat the entrance port is similar to the result of low energy beam and to the penetration results at high energy at a deep penetration depth close to the exit port. The dose per electron beam charge was obtained to be 7 cGy/nC.

[1] T. Tajima and J. Dawson, Phys. Rev. Lett., vol. 43, 267, 1979
[2] Emil Sch€uler, Kjell Eriksson, Elin Hynning, Steven L. Hancock, Susan M. Hiniker, Magdalena Bazalova-Carter, Tony Wong, Quynh-Thu Le, Billy W. Loo J and Peter G. Maxim, Med. Phys. 44, 2544, 2017
[3] Jaehoon Kim , Yong Hun Hwangbo and Kyung Nam Kim, Plasma Phys. Control. Fusion 60, 034008, 2018

Working group Laser-driven electron acceleration

Primary author

Kyung-Nam Kim (Korea Electrotechnology Research Institute)

Co-authors

Dr Jaehoon Kim (Korea Electrotechnology Research Institute) Mr Soorim Han (Korea Institute of Radiological and Medical Sciences) Mr Yonghun Hwangbo (Korea Electrotechnology Research Institute) Dr Sukgi Jeon (Korea Electrotechnology Research Institute) Gum Bae Kim (Korea Institute of Radiological and Medical Sciences)

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