Abstract
A laser-driven repetition-rated 1.9 MeV proton beam line composed of permanent quadrupole magnets (PMQs), a radio frequency (rf) phase rotation cavity, and a tunable monochromator is developed to evaluate and to test the simulation of laser-accelerated proton beam transport through an integrated system for the first time. In addition, the proton spectral modulation and focusing behavior of the rf phase rotation cavity device is monitored with input from a PMQ triplet. In the 1.9 MeV region we observe very weak proton defocusing by the phase rotation cavity. The final transmitted bunch duration and transverse profile are well predicted by the PARMILA particle transport code. The transmitted proton beam duration of 6 ns corresponds to an energy spread near 5% for which the transport efficiency is simulated to be 10%. The predictive capability of PARMILA suggests that it can be useful in the design of future higher energy transport beam lines as part of an integrated laser-driven ion accelerator system.
Highlights
Development of high-power repetition-rated laser systems continues, following the first observation of proton acceleration by intense laser pulses irradiating thin solid targets [1,2]
The proton spectral modulation and focusing behavior of the rf phase rotation cavity device is monitored with input from a permanent quadrupole magnets (PMQs) triplet
The predictive capability of PARMILA suggests that it can be useful in the design of future higher energy transport beam lines as part of an integrated laser-driven ion accelerator system
Summary
Development of high-power repetition-rated laser systems continues, following the first observation of proton acceleration by intense laser pulses irradiating thin solid targets [1,2]. In the laser-plasma interaction, protons are accelerated from the rear (downstream) surface of the solid target by a strong quasistatic electric field of micron scale length with an acceleration gradient of order MeV=m. The divergent proton emission from the source can have very high single bunch charge and peak current ( > 1012 protons with duration near 1 ps) combined with an ultralow emittance [4,5,6] Because of this compact and unique source size, laserdriven ion sources can attract many applications, which include injectors for conventional accelerators (hybrid systems) [7,8,9] and all-optical accelerators [10], and with the potential for development of compact facilities for laserdriven ion beam radiotherapy (L-IBRT) [11,12]. Most existing medical facilities that are based on conventional ion accelerators are typically large (in size and cost), limiting their number and access to ion beam
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