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Title: Adapting The JLEIC Electron Ring for Ion Acceleration

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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Nuclear Physics
OSTI Identifier:
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: 8th International Particle Accelerator Conference, 05/14/17 - 05/19/17, Copenhagen, DK
Country of Publication:
United States

Citation Formats

Mustapha, B., Martinez Marin, J., Conway, Z., Ostroumov, P., Lin, F., Morozov, V., Derbenev, Y., and Zhang, Y. Adapting The JLEIC Electron Ring for Ion Acceleration. United States: N. p., 2017. Web. doi:10.18429/JACoW-IPAC2017-WEPIK035.
Mustapha, B., Martinez Marin, J., Conway, Z., Ostroumov, P., Lin, F., Morozov, V., Derbenev, Y., & Zhang, Y. Adapting The JLEIC Electron Ring for Ion Acceleration. United States. doi:10.18429/JACoW-IPAC2017-WEPIK035.
Mustapha, B., Martinez Marin, J., Conway, Z., Ostroumov, P., Lin, F., Morozov, V., Derbenev, Y., and Zhang, Y. Sun . "Adapting The JLEIC Electron Ring for Ion Acceleration". United States. doi:10.18429/JACoW-IPAC2017-WEPIK035.
title = {Adapting The JLEIC Electron Ring for Ion Acceleration},
author = {Mustapha, B. and Martinez Marin, J. and Conway, Z. and Ostroumov, P. and Lin, F. and Morozov, V. and Derbenev, Y. and Zhang, Y.},
abstractNote = {},
doi = {10.18429/JACoW-IPAC2017-WEPIK035},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun May 14 00:00:00 EDT 2017},
month = {Sun May 14 00:00:00 EDT 2017}

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  • The figure-8-shaped ion collider ring of Jefferson Lab Electron-Ion Collider (JLEIC) is transparent to the spin. It allows one to preserve proton and deuteron polarizations using weak stabilizing solenoids when accelerating the beam up to 100 GeV/c. When the stabilizing solenoids are introduced into the collider's lattice, the particle spins precess about a spin field, which consists of the field induced by the stabilizing solenoids and the zero-integer spin resonance strength. During acceleration of the beam, the induced spin field is maintained constant while the resonance strength experiences significant changes in the regions of "interference peaks". The beam polarization dependsmore » on the field ramp rate of the arc magnets. Its component along the spin field is preserved if acceleration is adiabatic. We present the results of our theoretical analysis and numerical modeling of the spin dynamics during acceleration of protons and deuterons in the JLEIC ion collider ring. We demonstrate high stability of the deuteron polarization in figure-8 accelerators. We analyze a change in the beam polarization when crossing the transition energy.« less
  • 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
  • The sensitivity to misalignment, magnet strength error, and BPM noise is investigated in order to specify design tolerances for the ion collider ring of the Jefferson Lab Electron Ion Collider (JLEIC) project. Those errors, including horizontal, vertical, longitudinal displacement, roll error in transverse plane, strength error of main magnets (dipole, quadrupole, and sextupole), BPM noise, and strength jitter of correctors, cause closed orbit distortion, tune change, beta-beat, coupling, chromaticity problem, etc. These problems generally reduce the dynamic aperture at the Interaction Point (IP). According to real commissioning experiences in other machines, closed orbit correction, tune matching, beta-beat correction, decoupling, andmore » chromaticity correction have been done in the study. Finally, we find that the dynamic aperture at the IP is restored. This paper describes that work.« less
  • To get a luminosity level of a few 10 33 cm -2ses ₋1 at all design points of the Jefferson Lab Electron Ion Collider (JLEIC) project, small β* values in both horizontal and vertical planes are necessary at the Interaction Point (IP) in the ion collider ring. This also means large β in the final focus area, chromaticity correction sections, etc. which sets a constraint on the field quality of magnets in large beta areas, in order to ensure a large enough dynamic aperture (DA). In this context, limiting multipole field components of magnets are surveyed to find a possiblemore » compromise between the requirements and what can be realistically achieved by a magnet manufacturer. This paper describes that work. Moreover, non-linear field dedicated correctors are also studied to provide semi-local corrections of specific multipole field components.« less