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Title: Prototyping high-gradient mm-wave accelerating structures

We present single-cell accelerating structures designed for high-gradient testing at 110 GHz. The purpose of this work is to study the basic physics of ultrahigh vacuum RF breakdown in high-gradient RF accelerators. The accelerating structures are π-mode standing-wave cavities fed with a TM 01 circular waveguide. The structures are fabricated using precision milling out of two metal blocks, and the blocks are joined with diffusion bonding and brazing. The impact of fabrication and joining techniques on the cell geometry and RF performance will be discussed. First prototypes had a measured Q 0 of 2800, approaching the theoretical design value of 3300. The geometry of these accelerating structures are as close as practical to singlecell standing-wave X-band accelerating structures more than 40 of which were tested at SLAC. This wealth of X-band data will serve as a baseline for these 110 GHz tests. Furthermore, the structures will be powered with short pulses from a MW gyrotron oscillator. RF power of 1 MW may allow an accelerating gradient of 400 MeV/m to be reached.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [3]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. INFN-LFN, Rome (Italy)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Conference Series
Additional Journal Information:
Journal Volume: 874; Journal ID: ISSN 1742-6588
Publisher:
IOP Publishing
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS
OSTI Identifier:
1409314

Nanni, Emilio A., Dolgashev, Valery A., Haase, Andrew, Neilson, Jeffrey, Tantawi, Sami, Schaub, Samuel C., Temkin, Richard J., and Spataro, Bruno. Prototyping high-gradient mm-wave accelerating structures. United States: N. p., Web. doi:10.1088/1742-6596/874/1/012039.
Nanni, Emilio A., Dolgashev, Valery A., Haase, Andrew, Neilson, Jeffrey, Tantawi, Sami, Schaub, Samuel C., Temkin, Richard J., & Spataro, Bruno. Prototyping high-gradient mm-wave accelerating structures. United States. doi:10.1088/1742-6596/874/1/012039.
Nanni, Emilio A., Dolgashev, Valery A., Haase, Andrew, Neilson, Jeffrey, Tantawi, Sami, Schaub, Samuel C., Temkin, Richard J., and Spataro, Bruno. 2017. "Prototyping high-gradient mm-wave accelerating structures". United States. doi:10.1088/1742-6596/874/1/012039. https://www.osti.gov/servlets/purl/1409314.
@article{osti_1409314,
title = {Prototyping high-gradient mm-wave accelerating structures},
author = {Nanni, Emilio A. and Dolgashev, Valery A. and Haase, Andrew and Neilson, Jeffrey and Tantawi, Sami and Schaub, Samuel C. and Temkin, Richard J. and Spataro, Bruno},
abstractNote = {We present single-cell accelerating structures designed for high-gradient testing at 110 GHz. The purpose of this work is to study the basic physics of ultrahigh vacuum RF breakdown in high-gradient RF accelerators. The accelerating structures are π-mode standing-wave cavities fed with a TM01 circular waveguide. The structures are fabricated using precision milling out of two metal blocks, and the blocks are joined with diffusion bonding and brazing. The impact of fabrication and joining techniques on the cell geometry and RF performance will be discussed. First prototypes had a measured Q0 of 2800, approaching the theoretical design value of 3300. The geometry of these accelerating structures are as close as practical to singlecell standing-wave X-band accelerating structures more than 40 of which were tested at SLAC. This wealth of X-band data will serve as a baseline for these 110 GHz tests. Furthermore, the structures will be powered with short pulses from a MW gyrotron oscillator. RF power of 1 MW may allow an accelerating gradient of 400 MeV/m to be reached.},
doi = {10.1088/1742-6596/874/1/012039},
journal = {Journal of Physics. Conference Series},
number = ,
volume = 874,
place = {United States},
year = {2017},
month = {1}
}