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Title: COMPENSATION OF CHROMATICITY IN THE JLEIC ELECTRON COLLIDER RING

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1336370
Report Number(s):
SLAC-PUB-16846
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Presented at the 2nd North American Particle Accelerator Conference (NAPAC 2016) 09-14 Oct 2016. Chicago, Illinois, USA
Country of Publication:
United States
Language:
English
Subject:
ACCPHY

Citation Formats

Nosochkov, Y.M., Cai, Y., Sullivan, M., /SLAC, Derbenev, Ya.S., Lin, F., Morozov, V.S., Pilat, F., Wei, G.H., Zhang, Y., /Jefferson Lab., and Wang, M.-H.. COMPENSATION OF CHROMATICITY IN THE JLEIC ELECTRON COLLIDER RING. United States: N. p., 2017. Web.
Nosochkov, Y.M., Cai, Y., Sullivan, M., /SLAC, Derbenev, Ya.S., Lin, F., Morozov, V.S., Pilat, F., Wei, G.H., Zhang, Y., /Jefferson Lab., & Wang, M.-H.. COMPENSATION OF CHROMATICITY IN THE JLEIC ELECTRON COLLIDER RING. United States.
Nosochkov, Y.M., Cai, Y., Sullivan, M., /SLAC, Derbenev, Ya.S., Lin, F., Morozov, V.S., Pilat, F., Wei, G.H., Zhang, Y., /Jefferson Lab., and Wang, M.-H.. Mon . "COMPENSATION OF CHROMATICITY IN THE JLEIC ELECTRON COLLIDER RING". United States. doi:. https://www.osti.gov/servlets/purl/1336370.
@article{osti_1336370,
title = {COMPENSATION OF CHROMATICITY IN THE JLEIC ELECTRON COLLIDER RING},
author = {Nosochkov, Y.M. and Cai, Y. and Sullivan, M. and /SLAC and Derbenev, Ya.S. and Lin, F. and Morozov, V.S. and Pilat, F. and Wei, G.H. and Zhang, Y. and /Jefferson Lab. and Wang, M.-H.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Mar 06 00:00:00 EST 2017},
month = {Mon Mar 06 00:00:00 EST 2017}
}

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  • The electron collider ring of the Jefferson Lab Electron-Ion Collider (JLEIC) is designed to provide an electron beam with a small beam size at the IP for collisions with an ion beam in order to reach a desired high luminosity. For a chosen beta-star at the IP, electron beam size is determined by the equilibrium emittance that can be obtained through a linear optics design. This paper briefly describes the baseline design of the electron collider ring reusing PEP-II components and considering their parameters (such as dipole sagitta, magnet field strengths and acceptable synchrotron radiation power) and reports a fewmore » approaches to reducing the equilibrium emittance in the electron collider ring.« less
  • The luminosity of a ring-ring electron-ion collider is limited by the beam-beam effect on the electrons. Simulation studies have shown that for short ion bunches this limit can be significantly increased by head-on beam-beam compensation via an electron lens. However, due to the large beam-beam parameter experienced by the electrons, together with an ion bunch length comparable to the beta-function at the IP, electrons perform a sizeable fraction of a betatron oscillation period inside both the long ion bunches and the electron lens. Recent results of our simulation studies of this effect will be presented.
  • One of the luminosity limits in a ring-ring electron-ion collider is the beam-beam effect on the electrons. In the limit of short ion bunches, simulation studies have shown that this limit can be significantly increased by head-on beam-beam compensation with an electron lens. However, with an ion bunch length comparable to the beta-function at the IP in conjunction with a large beam-beam parameter, the electrons perform a sizeable fraction of a betatron oscillation period inside the long ion bunches. We present recent simulation results on the compensation of this beam-beam interaction with multiple electron lenses.
  • We describe the bunch splitting strategies for the proposed JLEIC ion collider ring at Jefferson Lab. This complex requires an unprecedented 9:6832 bunch splitting, performed in several stages. We outline the problem and current results, optimized with ESME including general parameterization of 1:2 bunch splitting for JLEIC parameters.
  • The Jefferson Lab Electron-Ion Collider (JLEIC) will accelerate protons and ions from 8 GeV to 100 GeV. A very low beta function at the Interaction Point (IP) is needed to achieve the required luminosity. One consequence of the low beta optics is that the beta function in the final focusing (FF) quadrupoles is extremely high. This leads to a large beam size in these magnets as well as strong sensitivity to errors which limits the dynamic aperture. These effects are stronger at injection energy where the beam size is maximum, and therefore very large aperture FF magnets are required tomore » allow a large dynamic aperture. A standard solution is a relaxed injection optics with IP beta function large enough to provide a reasonable FF aperture. This also reduces the effects of FF errors resulting in a larger dynamic aperture at injection. We describe the ion ring injection optics design as well as a beta-squeeze transition from the injection to collision optics.« less