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Title: The use of ionization electron columns for space-charge compensation in high intensity proton accelerators

Abstract

We discuss a recent proposal to use strongly magnetized electron columns created by beam ionization of the residual gas for compensation of space charge forces of high intensity proton beams in synchrotrons and linacs. The electron columns formed by trapped ionization electrons in a longitudinal magnetic field that assures transverse distribution of electron space charge in the column is the same as in the proton beam. Electrostatic electrodes are used to control the accumulation and release of the electrons. Ions are not magnetized and drift away without affecting the compensation. Possible technical solution for the electron columns is presented. We also discuss the first numerical simulation results for space-charge compensation in the FNAL Booster and results of relevant beam studies in the Tevatron.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
950873
Report Number(s):
FERMILAB-CONF-08-395-APC
TRN: US0902070
DOE Contract Number:
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Journal Name: AIP Conf.Proc.1086:649-654,2009; Conference: Prepared for 13th Advanced Accelerator Concepts Workshop (AAC08), Santa Cruz, California, 27 Jul - 2 Aug 2008
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; DISTRIBUTION; ELECTRODES; ELECTRONS; ELECTROSTATICS; FERMILAB TEVATRON; IONIZATION; LINEAR ACCELERATORS; MAGNETIC FIELDS; PROTON BEAMS; PROTONS; SIMULATION; SPACE CHARGE; SYNCHROTRONS; Accelerators

Citation Formats

Shiltsev, V., Alexahin, Y., Kamerdzhiev, V., Kapin, V., Kuznetsov, G., and /Fermilab. The use of ionization electron columns for space-charge compensation in high intensity proton accelerators. United States: N. p., 2009. Web. doi:10.1063/1.3080984.
Shiltsev, V., Alexahin, Y., Kamerdzhiev, V., Kapin, V., Kuznetsov, G., & /Fermilab. The use of ionization electron columns for space-charge compensation in high intensity proton accelerators. United States. doi:10.1063/1.3080984.
Shiltsev, V., Alexahin, Y., Kamerdzhiev, V., Kapin, V., Kuznetsov, G., and /Fermilab. 2009. "The use of ionization electron columns for space-charge compensation in high intensity proton accelerators". United States. doi:10.1063/1.3080984. https://www.osti.gov/servlets/purl/950873.
@article{osti_950873,
title = {The use of ionization electron columns for space-charge compensation in high intensity proton accelerators},
author = {Shiltsev, V. and Alexahin, Y. and Kamerdzhiev, V. and Kapin, V. and Kuznetsov, G. and /Fermilab},
abstractNote = {We discuss a recent proposal to use strongly magnetized electron columns created by beam ionization of the residual gas for compensation of space charge forces of high intensity proton beams in synchrotrons and linacs. The electron columns formed by trapped ionization electrons in a longitudinal magnetic field that assures transverse distribution of electron space charge in the column is the same as in the proton beam. Electrostatic electrodes are used to control the accumulation and release of the electrons. Ions are not magnetized and drift away without affecting the compensation. Possible technical solution for the electron columns is presented. We also discuss the first numerical simulation results for space-charge compensation in the FNAL Booster and results of relevant beam studies in the Tevatron.},
doi = {10.1063/1.3080984},
journal = {AIP Conf.Proc.1086:649-654,2009},
number = ,
volume = ,
place = {United States},
year = 2009,
month = 1
}

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  • We discuss a recent proposal to use strongly magnetized electron columns created by beam ionization of the residual gas for compensation of space charge forces of high intensity proton beams in synchrotrons and linacs. The electron columns formed by trapped ionization electrons in a longitudinal magnetic field that assures transverse distribution of electron space charge in the column is the same as in the proton beam. Electrostatic electrodes are used to control the accumulation and release of the electrons. Ions are not magnetized and drift away without affecting the compensation. Possible technical solution for the electron columns is presented. Wemore » also discuss the first numerical simulation results for space-charge compensation in the FNAL Booster and results of relevant beam studies in the Tevatron.« less
  • The ability to transport a high current proton beam in a ring is ultimately limited by space charge effects. Two novel ways to overcome this limit in a proton ring are by adding low energy, externally matched electron beams (electron lens, e-lens), and by taking advantage of residual gas ionization induced neutralization to create an electron column (e-column). Theory predicts that an appropriately confined electrons can completely compensate the space charge through neutralization, both transversely and longitudinally. In this report, we will discuss the current status of the Fermilab’s e-lens experiment for the space charge compensation. In addition, we willmore » show how the IOTA e-column compensates space charge with theWARP simulations. The dynamics of proton beams inside of the e-column is understood by changing the magnetic field of a solenoid, the voltage on the electrodes, and the vacuum pressure, and by looking for electron accumulation, as well as by considering various beam dynamics in the IOTA ring.« less
  • We propose to use microchannel plate (MCP) as a gigantic quantum efficiency photo-cathode in electron guns. Another proposal is to use electron columns formed by ionization electrons in a longitudinal magnetic field for compensation of space charge effects in high intensity proton synchrotrons. Strong magnetic field is to assure that transverse distribution of electron space charge in the column is the same as in proton beam. Electrostatic electrodes are to control the accumulation and release of the electrons. Ions are not magnetized and drift away without affecting the compensation.