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Title: The Development Programme of Cathodes and Electron Guns for the Hollow Electron Lenses of the High Luminosity LHC Project

Abstract

The High Luminosity LHC project (HL-LHC) foresees the construction and installation of important new equipment to increase the performance of the LHC machine. The Hollow Electron Lens (HEL) is a promising system to control the beam halo. It improves the beam collimation system of the HL-LHC and mitigates possible equipment damage in case of failure scenarios from halo losses. The halo can store up to 30 MJ energy. The specifications for this new device are quite demanding. The source, an electron gun with an annular shaped cathode, has to deliver a current up to 5 A. This is five times higher than the current in the existing electron lenses in Fermi and Brookhaven national laboratories. This note describes the programme carried out to design and test high-perveance guns equipped with two types of high-performance scandate cathodes. The size of the final gun is now considerably smaller than the one of the first prototype, allowing a reduction of diameter and cost of the superconducting magnet system used to steer the electron beam. The tests carried out at FNAL, BVERI and BJUT demonstrated that the developed cathodes fulfil the specifications and can supply a 5 A fully Space Charge Limited (SCL) current.

Authors:
 [1]; ORCiD logo [2];  [3];  [1];  [3];  [4];  [2];  [3]; ORCiD logo [2]; ORCiD logo [2];  [4];  [4];  [4];  [3]
  1. CERN
  2. Fermilab
  3. Vacuum Elect. Res. Inst., Beijing
  4. Beijing U. of Tech.
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:
1576541
Report Number(s):
FERMILAB-CONF-19-337-AD
oai:inspirehep.net:1745020
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: 10th International Particle Accelerator Conference, Melbourne, Australia, 05/19-05/24/2019
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Perini, Diego, Crawford, Darren, Feng, Jinjun, Gobbi, Giorgia, Li, Zepeng, Liu, Wei, Ruan, Jinhao, Shao, Wensheng, Stancari, Giulio, Valerio, Linda, Wang, Jinshu, Wang, Yiman, Yang, Yunfei, and Zhang, Ke. The Development Programme of Cathodes and Electron Guns for the Hollow Electron Lenses of the High Luminosity LHC Project. United States: N. p., 2019. Web. doi:10.18429/JACoW-IPAC2019-MOPTS099.
Perini, Diego, Crawford, Darren, Feng, Jinjun, Gobbi, Giorgia, Li, Zepeng, Liu, Wei, Ruan, Jinhao, Shao, Wensheng, Stancari, Giulio, Valerio, Linda, Wang, Jinshu, Wang, Yiman, Yang, Yunfei, & Zhang, Ke. The Development Programme of Cathodes and Electron Guns for the Hollow Electron Lenses of the High Luminosity LHC Project. United States. doi:10.18429/JACoW-IPAC2019-MOPTS099.
Perini, Diego, Crawford, Darren, Feng, Jinjun, Gobbi, Giorgia, Li, Zepeng, Liu, Wei, Ruan, Jinhao, Shao, Wensheng, Stancari, Giulio, Valerio, Linda, Wang, Jinshu, Wang, Yiman, Yang, Yunfei, and Zhang, Ke. Fri . "The Development Programme of Cathodes and Electron Guns for the Hollow Electron Lenses of the High Luminosity LHC Project". United States. doi:10.18429/JACoW-IPAC2019-MOPTS099. https://www.osti.gov/servlets/purl/1576541.
@article{osti_1576541,
title = {The Development Programme of Cathodes and Electron Guns for the Hollow Electron Lenses of the High Luminosity LHC Project},
author = {Perini, Diego and Crawford, Darren and Feng, Jinjun and Gobbi, Giorgia and Li, Zepeng and Liu, Wei and Ruan, Jinhao and Shao, Wensheng and Stancari, Giulio and Valerio, Linda and Wang, Jinshu and Wang, Yiman and Yang, Yunfei and Zhang, Ke},
abstractNote = {The High Luminosity LHC project (HL-LHC) foresees the construction and installation of important new equipment to increase the performance of the LHC machine. The Hollow Electron Lens (HEL) is a promising system to control the beam halo. It improves the beam collimation system of the HL-LHC and mitigates possible equipment damage in case of failure scenarios from halo losses. The halo can store up to 30 MJ energy. The specifications for this new device are quite demanding. The source, an electron gun with an annular shaped cathode, has to deliver a current up to 5 A. This is five times higher than the current in the existing electron lenses in Fermi and Brookhaven national laboratories. This note describes the programme carried out to design and test high-perveance guns equipped with two types of high-performance scandate cathodes. The size of the final gun is now considerably smaller than the one of the first prototype, allowing a reduction of diameter and cost of the superconducting magnet system used to steer the electron beam. The tests carried out at FNAL, BVERI and BJUT demonstrated that the developed cathodes fulfil the specifications and can supply a 5 A fully Space Charge Limited (SCL) current.},
doi = {10.18429/JACoW-IPAC2019-MOPTS099},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {6}
}

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