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Comparison of scaling laws with PIC simulations for proton acceleration with long wavelength pulses

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Title: Comparison of scaling laws with PIC simulations for proton acceleration with long wavelength pulses
Authors: Turchetti, G.1 turchetti@bo.infn.it, Sgattoni, A.1, Benedetti, C.1, Londrillo, P.2, Di Lucchio, L.1
Source: Nuclear Instruments & Methods in Physics Research Section A. Aug2010, Vol. 620 Issue 1, p51-55. 5p.
Subjects: Comparative studies, Scaling laws (Nuclear physics), Simulation methods & models, Proton accelerators, Force & energy, Radiation pressure, Nuclear physics
Abstract: Abstract: We have performed a survey of proton acceleration induced by long wavelength pulses to explore their peak energy dependence on the pulse intensity, target thickness and density. The simulations carried out with the PIC code ALADYN for a circularly polarized pulse have been compared with the scaling laws for radiation pressure acceleration (RPA) in the thick target and thin target regimes known as hole boring (HB) and relativistic mirror (RM) respectively. Since the critical density scales as , longer wavelength pulses allow to work with low density targets several microns thick and with moderate laser power. Under these conditions is possible to enter the RM region, where the key parameter is the ratio between twice laser energy and the mirror rest energy; the corresponding acceleration efficiency is given by . For a fixed intensity the minimum thickness of the target, and consequently the highest acceleration, is determined by the threshold of self induced transparency. In this case the number of accelerated particles scales with whereas the total energy does not depend on it. The agreement of PIC simulations with RPA and RM scalings, including the transition regions, suggests that these scalings can safely be used as the first step in the parametric scans also for large wavelength pulses such as CO2 lasers, to explore possible alternatives to short wavelength very high power Ti:Sa lasers for proton acceleration. [Copyright &y& Elsevier]
Copyright of Nuclear Instruments & Methods in Physics Research Section A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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An: 51810052
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  Data: Comparison of scaling laws with PIC simulations for proton acceleration with long wavelength pulses
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  Data: Abstract: We have performed a survey of proton acceleration induced by long wavelength pulses to explore their peak energy dependence on the pulse intensity, target thickness and density. The simulations carried out with the PIC code ALADYN for a circularly polarized pulse have been compared with the scaling laws for radiation pressure acceleration (RPA) in the thick target and thin target regimes known as hole boring (HB) and relativistic mirror (RM) respectively. Since the critical density scales as , longer wavelength pulses allow to work with low density targets several microns thick and with moderate laser power. Under these conditions is possible to enter the RM region, where the key parameter is the ratio between twice laser energy and the mirror rest energy; the corresponding acceleration efficiency is given by . For a fixed intensity the minimum thickness of the target, and consequently the highest acceleration, is determined by the threshold of self induced transparency. In this case the number of accelerated particles scales with whereas the total energy does not depend on it. The agreement of PIC simulations with RPA and RM scalings, including the transition regions, suggests that these scalings can safely be used as the first step in the parametric scans also for large wavelength pulses such as CO2 lasers, to explore possible alternatives to short wavelength very high power Ti:Sa lasers for proton acceleration. [Copyright &y& Elsevier]
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  Data: <i>Copyright of Nuclear Instruments & Methods in Physics Research Section A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.nima.2010.01.059
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              Text: Aug2010
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