Experimental demonstration of externally driven millimeter-wave particle accelerator structure

Othman, Mohamed K.; Picard, Julian; Schaub, Samuel; Dolgashev, Valery A.; Lewis, Samantha M.; Neilson, Jeffery; Haase, Andrew; Jawla, Sudheer; Spataro, Bruno; Temkin, Richard J.; Tantawi, Sami; Nanni, Emilio A.

doi:10.1063/5.0011397

Title: Experimental demonstration of externally driven millimeter-wave particle accelerator structure

Journal Article · Mon Aug 17 00:00:00 EDT 2020 · Applied Physics Letters

DOI:https://doi.org/10.1063/5.0011397· OSTI ID:1833640

^[1]; Picard, Julian ^[2];

^[2]; Dolgashev, Valery A. ^[1];

^[1]; Neilson, Jeffery ^[1]; Haase, Andrew ^[1];

^[2]; Spataro, Bruno ^[3];

^[2]; Tantawi, Sami ^[1];

^[1]

Stanford Univ., Menlo Park, CA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
INFN-LNF, Rome (Italy)

We report the experimental demonstration of a mm-wave electron accelerating structure powered by a high-power rf source. We demonstrate reliable coupling of an unprecedented rf power—up to 575kW into the mm-wave accelerator structure using a quasi-optical setup. This standing wave accelerating structure consists of a single-cell copper cavity and a Gaussian to TM₀₁ mode converter. The accelerator structure is powered by 110 GHz, 10-ns long rf pulses. These pulses are chopped from 3 microsecond pulses from a gyrotron oscillator using a laser-driven silicon switch. We show an unprecedented high gradient up to 230MV/m that corresponds to a peak surface electric field of more than 520 MV/m. We have achieved these results after conditioning the cavity with more than 100,000 pulses. We also report preliminary measurements of rf breakdown rates, which are important for understanding rf breakdown physics in the millimeter-wave regime. Furthermore, these results open up many frontiers for applications not only limited to the next generation particle accelerators but also x-ray generation, probing material dynamics, and nonlinear light-matter interactions at mm-wave frequency.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0015566; AC02-76SF00515

OSTI ID:: 1833640

Alternate ID(s):: OSTI ID: 1647896

Journal Information:: Applied Physics Letters, Vol. 117, Issue 7; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 44 works

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43 PARTICLE ACCELERATORS
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Title: Experimental demonstration of externally driven millimeter-wave particle accelerator structure

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