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Title: Update on the Development of Externally Powered Dielectric-Loaded Accelerating Structures

Abstract

We report on recent progress in a program to develop an RF-driven Dielectric-Loaded Accelerating (DLA) structure, capable of supporting high gradient acceleration. Previous high power tests revealed that the earlier DLA structures suffered from multipactor and arcing at the dielectric joint. A few new DLA structures have been designed to alleviate this limitation including the coaxial coupler based DLA structure and the clamped DLA structure. These structures were recently fabricated and high power tested at the NRL X-band Magnicon facility. Results show the multipactor can be reduced by the TiN coating on the dielectric surface. Gradient of 15 MV/m has also been tested without dielectric breakdown in the test of the clamped DLA structure. Detailed results are reported, and future plans discussed.

Authors:
 [1];  [2];  [1]; ; ; ;  [3];  [4];  [5]
  1. Euclid Techlabs, LLC, 5900 Harper Rd, Solon, OH 44139 (United States)
  2. (United States)
  3. High Energy Physics Division, Argonne National Laboratory, Argonne, IL 60439 (United States)
  4. Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375 (United States)
  5. Icarus Research, Bethesda, MD 20814 (United States)
Publication Date:
OSTI Identifier:
21255259
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1086; Journal Issue: 1; Conference: 13. advanced accelerator concepts workshop, Santa Cruz, CA (United States), 27 Jul - 2 Aug 2008; Other Information: DOI: 10.1063/1.3080945; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BREAKDOWN; DIELECTRIC MATERIALS; LINEAR ACCELERATORS; MICROWAVE RADIATION; TITANIUM NITRIDES

Citation Formats

Jing, C., High Energy Physics Division, Argonne National Laboratory, Argonne, IL 60439, Kanareykin, A., Gai, W., Konecny, R., Power, J. G., Liu, W., Gold, S. H., and Kinkead, A. K.. Update on the Development of Externally Powered Dielectric-Loaded Accelerating Structures. United States: N. p., 2009. Web. doi:10.1063/1.3080945.
Jing, C., High Energy Physics Division, Argonne National Laboratory, Argonne, IL 60439, Kanareykin, A., Gai, W., Konecny, R., Power, J. G., Liu, W., Gold, S. H., & Kinkead, A. K.. Update on the Development of Externally Powered Dielectric-Loaded Accelerating Structures. United States. doi:10.1063/1.3080945.
Jing, C., High Energy Physics Division, Argonne National Laboratory, Argonne, IL 60439, Kanareykin, A., Gai, W., Konecny, R., Power, J. G., Liu, W., Gold, S. H., and Kinkead, A. K.. 2009. "Update on the Development of Externally Powered Dielectric-Loaded Accelerating Structures". United States. doi:10.1063/1.3080945.
@article{osti_21255259,
title = {Update on the Development of Externally Powered Dielectric-Loaded Accelerating Structures},
author = {Jing, C. and High Energy Physics Division, Argonne National Laboratory, Argonne, IL 60439 and Kanareykin, A. and Gai, W. and Konecny, R. and Power, J. G. and Liu, W. and Gold, S. H. and Kinkead, A. K.},
abstractNote = {We report on recent progress in a program to develop an RF-driven Dielectric-Loaded Accelerating (DLA) structure, capable of supporting high gradient acceleration. Previous high power tests revealed that the earlier DLA structures suffered from multipactor and arcing at the dielectric joint. A few new DLA structures have been designed to alleviate this limitation including the coaxial coupler based DLA structure and the clamped DLA structure. These structures were recently fabricated and high power tested at the NRL X-band Magnicon facility. Results show the multipactor can be reduced by the TiN coating on the dielectric surface. Gradient of 15 MV/m has also been tested without dielectric breakdown in the test of the clamped DLA structure. Detailed results are reported, and future plans discussed.},
doi = {10.1063/1.3080945},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1086,
place = {United States},
year = 2009,
month = 1
}
  • We report on recent progress in a program to develop an RF-driven Dielectric-Loaded Accelerating (DLA) structure, capable of supporting high gradient acceleration. Previous high power tests revealed that the earlier DLA structures suffered from multipactor and arcing at the dielectric joint. A few new DLA structures have been designed to alleviate this limitation including the coaxial coupler based DLA structure and the clamped DLA structure. These structures were recently fabricated and high power tested at the NRL X-band Magnicon facility. Results show the multipactor can be reduced by the TiN coating on the dielectric surface. Gradient of 15 MV/m hasmore » also been tested without dielectric breakdown in the test of the clamped DLA structure. Detailed results are reported, and future plans discussed.« less
  • We summarize recent progress in a program to develop externally powered dielectric-loaded accelerating (DLA) structures that can sustain high accelerating gradients. High-power RF tests of earlier structures showed strong multipactor loading. In addition, arcing at dielectric joints between the uniform DLA structure and matching sections at either end limited the achievable gradient. In this paper, we study the onset of multipactor in a DLA structure. We also study the effect of thin-film TiN coatings applied by atomic layer deposition and the effect of a reduction in the inner diameter of the structure. Test results of these structures show significant decreasesmore » in multipactor loading. We also test new structure designs that eliminate separate dielectric matching sections and, thus, the requirement for dielectric joints, including a DLA structure using a coaxial coupler and a clamped DLA structure. The clamped structure demonstrated a significantly improved gradient without breakdown.« less
  • There have been numerous studies examining the use of dielectric materials in accelerating structures in the past. Such studies and related experiments generally concluded that dielectric losses, with the resulting high power requirements, and field breakdown problems made such devices not very attractive. However, development of high dielectric constant, low loss materials plus new demands for emittance preserving acceleration warrant a new look at the idea. In this paper, we discuss reference parameter designs for S-band and X-band structures and show that dielectric loaded guide may now be practical and have certain advantages over conventional iris loaded structures. Preliminary experimentalmore » test results of X-band dielectric devices are reported« less
  • This paper presents a progress report on the development and testing of X-band dielectric-loaded accelerating structures. Recent tests on several quartz DLA structures with different inner diameters are reported. Designs for gap-free DLA structures are presented. Also, planned new experiments are discussed, including higher gradient traveling-wave and standing-wave structures and special grooved structures for multipactor suppression.
  • No abstract prepared.