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Title: Combined function magnets in the RHIC electron storage ring

Abstract

The maximum electron beam intensity, and therefore the luminosity, of the electron-ion collider eRHIC is limited by the available RF power, which has been chosen as 10 MW. To maximize the beam intensity in the presence of this limitation the bending radius needs to be chosen as large as possible. While this is generally accomplished by a FODO lattice in the arcs due to its high dipole packing factor, the quadrupoles in a separated-function lattice do not contribute to bending. The use of combined-function magnets instead of regular quadrupoles would allow the quadrupoles to contribute to the bending as well, which increases the actual bending radius of the machine. However, this measure also affects the damping distribution in the machine, and may even result in anti-damping, making the lattice not suitable as a storage ring. In the following we demonstrate how to convert a separated-function lattice to a combined-function lattice while simultaneously preserving the damping distribution.

Authors:
 [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1477489
Report Number(s):
eRHIC/63; BNL-209171-2018-TECH
DOE Contract Number:  
SC0012704
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Montag, Christoph. Combined function magnets in the RHIC electron storage ring. United States: N. p., 2018. Web. doi:10.2172/1477489.
Montag, Christoph. Combined function magnets in the RHIC electron storage ring. United States. doi:10.2172/1477489.
Montag, Christoph. Wed . "Combined function magnets in the RHIC electron storage ring". United States. doi:10.2172/1477489. https://www.osti.gov/servlets/purl/1477489.
@article{osti_1477489,
title = {Combined function magnets in the RHIC electron storage ring},
author = {Montag, Christoph},
abstractNote = {The maximum electron beam intensity, and therefore the luminosity, of the electron-ion collider eRHIC is limited by the available RF power, which has been chosen as 10 MW. To maximize the beam intensity in the presence of this limitation the bending radius needs to be chosen as large as possible. While this is generally accomplished by a FODO lattice in the arcs due to its high dipole packing factor, the quadrupoles in a separated-function lattice do not contribute to bending. The use of combined-function magnets instead of regular quadrupoles would allow the quadrupoles to contribute to the bending as well, which increases the actual bending radius of the machine. However, this measure also affects the damping distribution in the machine, and may even result in anti-damping, making the lattice not suitable as a storage ring. In the following we demonstrate how to convert a separated-function lattice to a combined-function lattice while simultaneously preserving the damping distribution.},
doi = {10.2172/1477489},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {10}
}