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Title: Development of dielectric-based high gradient accelerating structures.

Abstract

High gradient accelerating structures using dielectric-lined circular waveguides have been developed for a number of years at Argonne National Laboratory. In this article, we first report the experimental results of high power rf testing on the quartz based Dielectric-Loaded Accelerating (DLA) structure carried out on Feb. 2006 at the Naval Research Laboratory. The motivation for this experiment is to test the multipactor effect on different materials under high power and high vacuum condition. Up to 12 MW pulsed rf went through the tube without breakdown. Multipactor appeared during the experiment but with different features compared to other materials like alumina. Photomultiplier Tube (PMT) measurements were introduced into the experiment for the first time to observe the light emission time and intensity. In the second part of this paper, ways to achieve higher gradient for DLA structures are proposed: (1) smaller ID and longitudinal gap free DLA structures to reduce multipactor and obtain higher gradient; (2) new coaxial type coupler to avoid dielectric gap and improve impedance matching; (3) double layered DLA structure to reduce rf loss and enhance shunt impedance as well.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); USDOD
OSTI Identifier:
973764
Report Number(s):
ANL-HEP-CP-06-67
TRN: US1002029
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: 12th Advanced Accelerator Concepts Workshop; Jul. 10, 2006 - Jul. 15, 2006; Lake Geneva, WI
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; ACCELERATORS; ANL; BREAKDOWN; BYPASSES; DIELECTRIC MATERIALS; IMPEDANCE; NAVAL RESEARCH LABORATORY; PHOTOMULTIPLIERS; QUARTZ; TESTING; WAVEGUIDES

Citation Formats

Jing, C., Gai, W., Konecny, R., Power, J., Liu, w., Gold, S. H., Kinkead, A. K., Kanareykin, A., Kazakov, S., High Energy Physics, Euclid Techlabs, LLC, Naval Research Lab., LET Corp., and KEK. Development of dielectric-based high gradient accelerating structures.. United States: N. p., 2006. Web. doi:10.1063/1.2409150.
Jing, C., Gai, W., Konecny, R., Power, J., Liu, w., Gold, S. H., Kinkead, A. K., Kanareykin, A., Kazakov, S., High Energy Physics, Euclid Techlabs, LLC, Naval Research Lab., LET Corp., & KEK. Development of dielectric-based high gradient accelerating structures.. United States. doi:10.1063/1.2409150.
Jing, C., Gai, W., Konecny, R., Power, J., Liu, w., Gold, S. H., Kinkead, A. K., Kanareykin, A., Kazakov, S., High Energy Physics, Euclid Techlabs, LLC, Naval Research Lab., LET Corp., and KEK. Sun . "Development of dielectric-based high gradient accelerating structures.". United States. doi:10.1063/1.2409150.
@article{osti_973764,
title = {Development of dielectric-based high gradient accelerating structures.},
author = {Jing, C. and Gai, W. and Konecny, R. and Power, J. and Liu, w. and Gold, S. H. and Kinkead, A. K. and Kanareykin, A. and Kazakov, S. and High Energy Physics and Euclid Techlabs, LLC and Naval Research Lab. and LET Corp. and KEK},
abstractNote = {High gradient accelerating structures using dielectric-lined circular waveguides have been developed for a number of years at Argonne National Laboratory. In this article, we first report the experimental results of high power rf testing on the quartz based Dielectric-Loaded Accelerating (DLA) structure carried out on Feb. 2006 at the Naval Research Laboratory. The motivation for this experiment is to test the multipactor effect on different materials under high power and high vacuum condition. Up to 12 MW pulsed rf went through the tube without breakdown. Multipactor appeared during the experiment but with different features compared to other materials like alumina. Photomultiplier Tube (PMT) measurements were introduced into the experiment for the first time to observe the light emission time and intensity. In the second part of this paper, ways to achieve higher gradient for DLA structures are proposed: (1) smaller ID and longitudinal gap free DLA structures to reduce multipactor and obtain higher gradient; (2) new coaxial type coupler to avoid dielectric gap and improve impedance matching; (3) double layered DLA structure to reduce rf loss and enhance shunt impedance as well.},
doi = {10.1063/1.2409150},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}

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  • High gradient accelerating structures using dielectric-lined circular waveguides have been developed for a number of years at Argonne National Laboratory. In this article, we first report the experimental results of high power rf testing on the quartz based Dielectric-Loaded Accelerating (DLA) structure carried out on Feb. 2006 at the Naval Research Laboratory. The motivation for this experiment is to test the multipactor effect on different materials under high power and high vacuum condition. Up to 12 MW pulsed rf went through the tube without breakdown. Multipactor appeared during the experiment but with different features compared to other materials like alumina.more » Photomultiplier Tube (PMT) measurements were introduced into the experiment for the first time to observe the light emission time and intensity. In the second part of this paper, ways to achieve higher gradient for DLA structures are proposed: 1) smaller ID and longitudinal gap free DLA structures to reduce multipactor and obtain higher gradient; 2) new coaxial type coupler to avoid dielectric gap and improve impedance matching; 3) double layered DLA structure to reduce rf loss and enhance shunt impedance as well.« less
  • The high-energy part of a proton linac, following a drift tube section, accelerates protons and H/sup -/ ions of energies above 150 MeV. High efficiency and high gradients in the accelerating structure considered for this part of a proton linac are studied. Several known and improved structures working at 1350 MHz were optimized for maximum shunt impedance. The study was performed with the extensive use of a computer code--SUPERFISH. The theoretical results of this study are presented.
  • 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
  • During the past five years, there has been a concerted program at SLAC and KEK to develop accelerator structures that meet the high gradient (65 MV/m) performance requirements for the Next Linear Collider (NLC) and Global Linear Collider (GLC) initiatives. The design that resulted is a 60-cm-long, traveling-wave structure with low group velocity and 150 degree per cell phase advance. It has an average iris size that produces an acceptable short-range wakefield, and dipole mode damping and detuning that adequately suppresses the long-range wakefield. More than eight such structures have operated at a 60 Hz repetition rate over 1000 hoursmore » at 65 MV/m with 400 ns long pulses, and have reached breakdown rate levels below the limit for the linear collider. Moreover, the structures are robust in that the rates continue to decrease over time, and if the structures are briefly exposed to air, the rates recover to their low levels within a few days. This paper presents a summary of the results from this program, which effectively ended last August with the selection of ''cold'' technology for an International Linear Collider (ILC).« less