skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Hollow Electron Beam Collimation for HL-LHC - Effects on the Beam Core

Abstract

Collimation with hollow electron beams is currently one of the most promising concepts for active halo control in the High Luminosity Large Hadron Collider (HL-LHC). To ensure the successful operation of the hollow beam collimator the unwanted effects on the beam core, which might arise from the operation with a pulsed electron beam, must be minimized. This paper gives a summary of the effect of hollow electron lenses on the beam core in terms of sources, provides estimates for HL-LHC and discusses the possible mitigation methods.

Authors:
 [1];  [1];  [1];  [2];  [2];  [2];  [3];  [2];  [2];  [2]
  1. Fermilab
  2. CERN
  3. Malta U.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1390183
Report Number(s):
FERMILAB-CONF-17-153-AD
1622968
DOE Contract Number:
AC02-07CH11359
Resource Type:
Conference
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Fitterer, M., Stancari, G., Valishev, A., Bruce, R., Papotti, G, Redaelli, S., Valentino, G., Valentino, G., Valuch, D., and Xu, C. Hollow Electron Beam Collimation for HL-LHC - Effects on the Beam Core. United States: N. p., 2017. Web.
Fitterer, M., Stancari, G., Valishev, A., Bruce, R., Papotti, G, Redaelli, S., Valentino, G., Valentino, G., Valuch, D., & Xu, C. Hollow Electron Beam Collimation for HL-LHC - Effects on the Beam Core. United States.
Fitterer, M., Stancari, G., Valishev, A., Bruce, R., Papotti, G, Redaelli, S., Valentino, G., Valentino, G., Valuch, D., and Xu, C. 2017. "Hollow Electron Beam Collimation for HL-LHC - Effects on the Beam Core". United States. doi:. https://www.osti.gov/servlets/purl/1390183.
@article{osti_1390183,
title = {Hollow Electron Beam Collimation for HL-LHC - Effects on the Beam Core},
author = {Fitterer, M. and Stancari, G. and Valishev, A. and Bruce, R. and Papotti, G and Redaelli, S. and Valentino, G. and Valentino, G. and Valuch, D. and Xu, C.},
abstractNote = {Collimation with hollow electron beams is currently one of the most promising concepts for active halo control in the High Luminosity Large Hadron Collider (HL-LHC). To ensure the successful operation of the hollow beam collimator the unwanted effects on the beam core, which might arise from the operation with a pulsed electron beam, must be minimized. This paper gives a summary of the effect of hollow electron lenses on the beam core in terms of sources, provides estimates for HL-LHC and discusses the possible mitigation methods.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 6
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • Collimation with hollow electron beams or lenses (HEL) is currently one of the most promising concepts for active halo control in HL-LHC. In previous studies it has been shown that the halo can be efficiently removed with a hollow electron lens. Equally important as an efficient removal of the halo, is also to demonstrate that the core stays unperturbed. In this paper, we present a summary of the experiment at the LHC and simulations in view of the effect of the HEL on the beam core in case of a pulsed operation.
  • The concept of augmenting the conventional collimation system of high-energy storage rings with a hollow electron beam was successfully demonstrated in experiments at the Tevatron. A reliable numerical model is required for understanding particle dynamics in the presence of a hollow beam collimator. Several models were developed to describe imperfections of the electron beam profile and alignment. The features of the imperfections are estimated from electron beam profile measurements. Numerical simulations of halo removal rates are compared with experimental data taken at the Tevatron.
  • Hollow electron lenses are considered as a possible means to improve the LHC beam collimation system, providing active control of halo diffusion rates and suppressing the population of transverse halos. After a very successful experience at the Tevatron, a conceptual design of a hollow e-lens optimized for the LHC was produced. Recent further studies have led to a mature preliminary technical design. In this paper, possible scenarios for the deployment of this technology at the LHC are elaborated in the context of the scheduled LHC long shutdowns until the full implementation of the HL-LHC upgrade in 2023. Possible setups ofmore » electron beam test stands at CERN and synergies with other relevant electron beam programmes are also discussed.« less
  • Electron lenses built and installed in the Tevatron have proven themselves as safe and very reliable instruments which can be effectively used in hadron collider operation for a number of applications, including compensation of beam-beam effects [1], a DC beam removal from abort gaps [2], and as a versatile diagnostic tool. In this article, we--following the original proposal [3,4]--consider in more detail a possibility of using electron lenses with hollow electron beam for ion and proton collimation in LHC and the Tevatron.