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Title	Simulations for MeV Energy Gain in Multi-Micron Vacuum Channel Dielectric Structures Driven by a CO₂ Laser
Authors	G. Yadav, O. Apsimon, Y. Wei, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom O. Apsimon, C.P. Welsch, G.X. Xia Cockcroft Institute, Warrington, Cheshire, United Kingdom G.X. Xia The University of Manchester, Manchester, United Kingdom
Abstract	Di­elec­tric Laser Ac­cel­er­a­tors (DLAs) have been demon­strated as a novel scheme for pro­duc­ing high ac­cel­er­a­tion gra­di­ents (~1 GV/m) within the dam­age thresh­old of the di­elec­tric. The com­pact­ness of the DLAs and the low emit­tance of the out­put elec­tron beam make it an at­trac­tive can­di­date for fu­ture en­do­scopic de­vices to be used in tumor ir­ra­di­a­tion. How­ever, due to the small ac­cel­er­at­ing dis­tances(sub-mm), the total en­ergy gain is lim­ited to sub-MeV which re­mains an ob­sta­cle for its re­al­is­tic ap­pli­ca­tions. Also, these DLAs op­er­ate under solid-state lasers with wave­lengths near IR (800 nm to 2 um), where re­quired sub-mi­cron vac­uum chan­nel at such wave­lengths im­poses major aper­ture re­stric­tions for the amount of charge to be ac­cel­er­ated. Here, we pre­sent nu­mer­i­cal sim­u­la­tion re­sults for a di­elec­tric struc­ture ex­cited by a CO₂ laser with a wave­length of 10.6 um. Upon in­ject­ing a 50 MeV elec­tron bunch through a 5.3 um di­am­e­ter of vac­uum chan­nel width, our sim­u­la­tion sug­gests an en­ergy gain be­yond 1 MeV. These re­sults are the ini­tial steps for the re­al­iza­tion of an mm-scale DLA ca­pa­ble of pro­duc­ing MeV en­ergy elec­tron beams.
Funding	This work was supported by STFC LIV. DAT under grant agreement ST/P006752/1. This research used the resources of the Supercomputing Laboratory at KAUST in Thuwal, Saudi Arabia.
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Conference	IPAC2021
Series	International Particle Accelerator Conference (12th)
Location	Campinas, SP, Brazil
Date	24-28 May 2021
Publisher	JACoW Publishing, Geneva, Switzerland
Editorial Board	Liu Lin (LNLS, Campinas, Brazil); John M. Byrd (ANL, Lemont, IL, USA); Regis Neuenschwander (LNLS, Campinas, Brazil); Renan Picoreti (LNLS, Campinas, Brazil); Volker R. W. Schaa (GSI, Darmstadt, Germany)
Online ISBN	978-3-95450-214-1
Online ISSN	2673-5490
Received	18 May 2021
Accepted	02 June 2021
Issue Date	11 August 2021
DOI	doi:10.18429/JACoW-IPAC2021-MOPAB143
Pages	499-501
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