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Title: Halo removal experiments with hollow electron lens in the BNL Relativistic Heavy Ion Collider

Abstract

A hollow electron beam has been proposed as an active control tool to remove the beam halo from high-energy, high-current hadron or ion machines (such as the High-Luminosity Large Hadron Collider). To study the halo removal rate and assess the effect on the ion beam core, one of the two electron lenses in the Relativistic Heavy Ion Collider was changed from a Gaussian beam profile to a hollow profile. We describe the design and verification of the hollow electron beam parameters as well as the methods to minimize the hollow beam profile distortions, which can result in an ion beam emittance increase. The hollow beam alignment with the ion beam by using a backscattered electron detector has been demonstrated. Furthermore, experiments were carried out to explore the efficiency of the halo removal by scanning the current and inner radius of the hollow electron beam, which is pulsed either every turn or every nth turn. The effects of the hollow electron beam on the ion beam emittance and luminosity were also assessed experimentally by scanning the inner radius of the electron beam.

Authors:
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Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1603811
Alternate Identifier(s):
OSTI ID: 1604326; OSTI ID: 1615363
Report Number(s):
BNL-213713-2020-JAAM; FERMILAB-PUB-20-067-AD
Journal ID: ISSN 2469-9888; PRABCJ; 031001
Grant/Contract Number:  
SC0012704; AC02-07CH11359
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 23 Journal Issue: 3; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Gu, X., Fischer, W., Altinbas, Z., Drees, A., Hock, J., Hulsart, R., Liu, C., Marusic, A., Miller, T. A., Minty, M., Robert-Demolaize, G., Tan, Y., Thieberger, P., Garcia Morales, H., Mirarchi, D., Redaelli, S., Pikin, A. I., and Stancari, G. Halo removal experiments with hollow electron lens in the BNL Relativistic Heavy Ion Collider. United States: N. p., 2020. Web. doi:10.1103/PhysRevAccelBeams.23.031001.
Gu, X., Fischer, W., Altinbas, Z., Drees, A., Hock, J., Hulsart, R., Liu, C., Marusic, A., Miller, T. A., Minty, M., Robert-Demolaize, G., Tan, Y., Thieberger, P., Garcia Morales, H., Mirarchi, D., Redaelli, S., Pikin, A. I., & Stancari, G. Halo removal experiments with hollow electron lens in the BNL Relativistic Heavy Ion Collider. United States. doi:https://doi.org/10.1103/PhysRevAccelBeams.23.031001
Gu, X., Fischer, W., Altinbas, Z., Drees, A., Hock, J., Hulsart, R., Liu, C., Marusic, A., Miller, T. A., Minty, M., Robert-Demolaize, G., Tan, Y., Thieberger, P., Garcia Morales, H., Mirarchi, D., Redaelli, S., Pikin, A. I., and Stancari, G. Mon . "Halo removal experiments with hollow electron lens in the BNL Relativistic Heavy Ion Collider". United States. doi:https://doi.org/10.1103/PhysRevAccelBeams.23.031001.
@article{osti_1603811,
title = {Halo removal experiments with hollow electron lens in the BNL Relativistic Heavy Ion Collider},
author = {Gu, X. and Fischer, W. and Altinbas, Z. and Drees, A. and Hock, J. and Hulsart, R. and Liu, C. and Marusic, A. and Miller, T. A. and Minty, M. and Robert-Demolaize, G. and Tan, Y. and Thieberger, P. and Garcia Morales, H. and Mirarchi, D. and Redaelli, S. and Pikin, A. I. and Stancari, G.},
abstractNote = {A hollow electron beam has been proposed as an active control tool to remove the beam halo from high-energy, high-current hadron or ion machines (such as the High-Luminosity Large Hadron Collider). To study the halo removal rate and assess the effect on the ion beam core, one of the two electron lenses in the Relativistic Heavy Ion Collider was changed from a Gaussian beam profile to a hollow profile. We describe the design and verification of the hollow electron beam parameters as well as the methods to minimize the hollow beam profile distortions, which can result in an ion beam emittance increase. The hollow beam alignment with the ion beam by using a backscattered electron detector has been demonstrated. Furthermore, experiments were carried out to explore the efficiency of the halo removal by scanning the current and inner radius of the hollow electron beam, which is pulsed either every turn or every nth turn. The effects of the hollow electron beam on the ion beam emittance and luminosity were also assessed experimentally by scanning the inner radius of the electron beam.},
doi = {10.1103/PhysRevAccelBeams.23.031001},
journal = {Physical Review Accelerators and Beams},
number = 3,
volume = 23,
place = {United States},
year = {2020},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: https://doi.org/10.1103/PhysRevAccelBeams.23.031001

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