Transverse profile of the electron beam for the RHIC electron lenses

X. Gu; Z. Altinbas; M. Costanzo; W. Fischer; D. M. Gassner; J. Hock; Y. Luo; T. Miller; Y. Tan; P. Thieberger; C. Montag; A. I. Pikin

doi:10.1016/j.nima.2015.07.001

Transverse profile of the electron beam for the RHIC electron lenses

X. Gu
, Z. Altinbas
, M. Costanzo
, W. Fischer
, D. M. Gassner
, J. Hock
, Y. Luo
, T. Miller
, Y. Tan
, P. Thieberger
, C. Montag
, A. I. Pikin

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

The transverse profile of the electron beam plays a very important role in assuring the success of the electron lens beam-beam compensation, as well as its application in space charge compensation. To compensate for the beam-beam effect in the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory, we recently installed and commissioned two electron lenses. In this paper, we describe, via theory and simulations using the code Parmela, the evolution of the density of the electron beam with space charge within an electron lens from the gun to the main solenoid. Our theoretical analysis shows that the change in the beam transverse density is dominated by the effects of the space charge induced longitudinal velocity reduction, not by those of transverse Coulomb collisions. We detail the transverse profile of RHIC electron-lens beam, measured via the YAG screen and pinhole detector, and also describe its profile that we assessed from the signal of the electron-backscatter detector (eBSD) via scanning the electron beam with respect to the RHIC beam. We verified, in simulations and experiments, that the distribution of the transverse electron beam is Gaussian throughout its propagation in the RHIC electron lens.

Original language	English
Pages (from-to)	36-43
Number of pages	8
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	798
DOIs	https://doi.org/10.1016/j.nima.2015.07.001
State	Published - Jul 31 2015
Externally published	Yes

Funding

The work is supported by Brookhaven Science Associates, LLC under Contract no. DE-AC02-98CH10886 with the U.S. Department of Energy .

Keywords

Electron lenses
Gaussian beam
Low energy electron beam
Space charge
Transverse beam profile

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10.1016/j.nima.2015.07.001

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Gu, X., Altinbas, Z., Costanzo, M., Fischer, W., Gassner, D. M., Hock, J., Luo, Y., Miller, T., Tan, Y., Thieberger, P., Montag, C., & Pikin, A. I. (2015). Transverse profile of the electron beam for the RHIC electron lenses. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 798, 36-43. https://doi.org/10.1016/j.nima.2015.07.001

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title = "Transverse profile of the electron beam for the RHIC electron lenses",

abstract = "The transverse profile of the electron beam plays a very important role in assuring the success of the electron lens beam-beam compensation, as well as its application in space charge compensation. To compensate for the beam-beam effect in the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory, we recently installed and commissioned two electron lenses. In this paper, we describe, via theory and simulations using the code Parmela, the evolution of the density of the electron beam with space charge within an electron lens from the gun to the main solenoid. Our theoretical analysis shows that the change in the beam transverse density is dominated by the effects of the space charge induced longitudinal velocity reduction, not by those of transverse Coulomb collisions. We detail the transverse profile of RHIC electron-lens beam, measured via the YAG screen and pinhole detector, and also describe its profile that we assessed from the signal of the electron-backscatter detector (eBSD) via scanning the electron beam with respect to the RHIC beam. We verified, in simulations and experiments, that the distribution of the transverse electron beam is Gaussian throughout its propagation in the RHIC electron lens.",

keywords = "Electron lenses, Gaussian beam, Low energy electron beam, Space charge, Transverse beam profile",

author = "X. Gu and Z. Altinbas and M. Costanzo and W. Fischer and Gassner, \{D. M.\} and J. Hock and Y. Luo and T. Miller and Y. Tan and P. Thieberger and C. Montag and Pikin, \{A. I.\}",

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Gu, X, Altinbas, Z, Costanzo, M, Fischer, W, Gassner, DM, Hock, J, Luo, Y, Miller, T, Tan, Y, Thieberger, P, Montag, C & Pikin, AI 2015, 'Transverse profile of the electron beam for the RHIC electron lenses', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 798, pp. 36-43. https://doi.org/10.1016/j.nima.2015.07.001

TY - JOUR

T1 - Transverse profile of the electron beam for the RHIC electron lenses

AU - Gu, X.

AU - Altinbas, Z.

AU - Costanzo, M.

AU - Fischer, W.

AU - Gassner, D. M.

AU - Hock, J.

AU - Luo, Y.

AU - Miller, T.

AU - Tan, Y.

AU - Thieberger, P.

AU - Montag, C.

AU - Pikin, A. I.

PY - 2015/7/31

Y1 - 2015/7/31

N2 - The transverse profile of the electron beam plays a very important role in assuring the success of the electron lens beam-beam compensation, as well as its application in space charge compensation. To compensate for the beam-beam effect in the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory, we recently installed and commissioned two electron lenses. In this paper, we describe, via theory and simulations using the code Parmela, the evolution of the density of the electron beam with space charge within an electron lens from the gun to the main solenoid. Our theoretical analysis shows that the change in the beam transverse density is dominated by the effects of the space charge induced longitudinal velocity reduction, not by those of transverse Coulomb collisions. We detail the transverse profile of RHIC electron-lens beam, measured via the YAG screen and pinhole detector, and also describe its profile that we assessed from the signal of the electron-backscatter detector (eBSD) via scanning the electron beam with respect to the RHIC beam. We verified, in simulations and experiments, that the distribution of the transverse electron beam is Gaussian throughout its propagation in the RHIC electron lens.

AB - The transverse profile of the electron beam plays a very important role in assuring the success of the electron lens beam-beam compensation, as well as its application in space charge compensation. To compensate for the beam-beam effect in the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory, we recently installed and commissioned two electron lenses. In this paper, we describe, via theory and simulations using the code Parmela, the evolution of the density of the electron beam with space charge within an electron lens from the gun to the main solenoid. Our theoretical analysis shows that the change in the beam transverse density is dominated by the effects of the space charge induced longitudinal velocity reduction, not by those of transverse Coulomb collisions. We detail the transverse profile of RHIC electron-lens beam, measured via the YAG screen and pinhole detector, and also describe its profile that we assessed from the signal of the electron-backscatter detector (eBSD) via scanning the electron beam with respect to the RHIC beam. We verified, in simulations and experiments, that the distribution of the transverse electron beam is Gaussian throughout its propagation in the RHIC electron lens.

KW - Electron lenses

KW - Gaussian beam

KW - Low energy electron beam

KW - Space charge

KW - Transverse beam profile

UR - https://www.scopus.com/pages/publications/84938083669

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VL - 798

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JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

ER -

Transverse profile of the electron beam for the RHIC electron lenses

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Keywords

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