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Title: Adiabatic Focuser

Abstract

Theoretical analysis is made of an intense relativistic electron beam. such as would be available from a linear collider, moving through a plasma of increasing density, but density always less than that of the beam (underdense). In this situation. the plasma electrons are expelled from the beam channel and the electrons are subject to an ever-increasing focusing force provided by the channel ions. Analysis is made on the beam radiation energy loss in the classical, the transition, and the quantum regimes. It is shown that the focuser is insensitive to the beam energy spread due to radiation loss. Furthermore, because of the different scaling behaviors in the nonclassical regimes, the radiation limit on lenses (the Oide limit) can be exceeded. The sensitivity of the system to the optic mismatch and the nonlinearity is also analyzed. Examples are given with SLC-type and TLC-type parameters.

Authors:
; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Accelerator& Fusion Research Division
OSTI Identifier:
937207
Report Number(s):
LBL-27608
TRN: US200819%%40
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Conference
Resource Relation:
Conference: XIV International Conference on High Energy Accelerators, Tsukuba,Japan, August 22-26, 1989
Country of Publication:
United States
Language:
English
Subject:
99; ACCELERATORS; ELECTRON BEAMS; ELECTRONS; FOCUSING; LENSES; LINEAR COLLIDERS; OPTICS; PLASMA; RADIATIONS; SENSITIVITY

Citation Formats

Chen, P., Oide, K., Sessler, Andrew M., and Yu, S.S. Adiabatic Focuser. United States: N. p., 1989. Web.
Chen, P., Oide, K., Sessler, Andrew M., & Yu, S.S. Adiabatic Focuser. United States.
Chen, P., Oide, K., Sessler, Andrew M., and Yu, S.S. Tue . "Adiabatic Focuser". United States. doi:. https://www.osti.gov/servlets/purl/937207.
@article{osti_937207,
title = {Adiabatic Focuser},
author = {Chen, P. and Oide, K. and Sessler, Andrew M. and Yu, S.S.},
abstractNote = {Theoretical analysis is made of an intense relativistic electron beam. such as would be available from a linear collider, moving through a plasma of increasing density, but density always less than that of the beam (underdense). In this situation. the plasma electrons are expelled from the beam channel and the electrons are subject to an ever-increasing focusing force provided by the channel ions. Analysis is made on the beam radiation energy loss in the classical, the transition, and the quantum regimes. It is shown that the focuser is insensitive to the beam energy spread due to radiation loss. Furthermore, because of the different scaling behaviors in the nonclassical regimes, the radiation limit on lenses (the Oide limit) can be exceeded. The sensitivity of the system to the optic mismatch and the nonlinearity is also analyzed. Examples are given with SLC-type and TLC-type parameters.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 01 00:00:00 EDT 1989},
month = {Tue Aug 01 00:00:00 EDT 1989}
}

Conference:
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  • In this paper we numerically study the effect of ion motion in an adiabatic focuser, motivated by a recent suggestion that ion motion in an adiabatic focuser might be significant and even preclude operation of the focuser as previously envisioned. It is shown that despite ion motion the adiabatic focuser should work as well as originally envisioned.
  • Theoretical analysis is made of an intense relativistic electron beam, such as would be available from a linear collider, moving through a plasma of increasing density, but density always less than that of the beam (underdense). In this situation, the plasma electrons are expelled from the beam channel and the electrons are subject to an ever-increasing focusing force provided by the channel ions. Analysis is made on the beam radiation energy loss in the classical, the transition, and the quantum regimes. It is shown that the focuser is insensitive to the beam energy spread behaviors in the nonclassical regimes, themore » radiation limit on lenses (the Oide limit) can be exceeded. The sensitivity of the system to the topic mismatch and the nonlinearity is also analyzed. Examples are given with SLC-type and TLC-type parameters. 9 refs., 1 tab.« less
  • Theoretical analysis is made of an intense relativistic electron beam moving through a plasma of increasing density, but density always less than that of the beam (underdense). Analysis is made of the beam radiation energy loss and it is noted that the focuser is insensitive to the beam energy spread due to radiation loss. Furthermore, because of the scaling behavior in the nonclassical regimes, the radiation limit on lenses (the Oide limit) can be exceeded.
  • This paper reports on high sensitive dc SQUID magnetometers and gradiometers with flux focusers instead of traditional coupling coils designed and experimentally tested. All refractory material DC SQUIDs with shunted Nb---AlO{sub x}---Nb tunnel junctions were used. The outer dimension of the square washer electrode was 2.5 mm, the inner one was 70{mu}m. A wide superconducting washer concentrates the magnetic flux by twenty times and the flux sensitivity about 20 nT/{phi}{sub 0} can be realized without any input coil. The application of the additional 14 mm diameter flux focuser has increased the flux concentration by four times more. As a resultmore » the magnetic field resolution 10 fT/square root Hz has been achieved; this figure corresponds to the flux resolution about 2 {center dot} 10{sup {minus}6}{phi}{sub 0}/square root Hz. Connecting the additional flux focuser to the placed apart compensation coils one can create gradiometers of both the first and higher orders.« less
  • A bender-focuser has been installed and characterized at the Cold Neutron Prompt Gamma Activation Analysis facility. It accepts the neutron beam exiting the {sup 58}Ni-coated guide, 45 x 50 mm in cross section, and compresses it to a sub-millimetre focus 42.5 mm below the axis of the direct beam. The gain in neutron intensity at the 0.65-mm FWHM spot is 20. However, by placing the lens in the beam, the overall gamma background has increased. Compared with a previously designed lens with the focus on the beam axis, the bender-focuser results in less increase in the gamma background. We reportmore » a work in progress using the bender-focuser for material studies.« less