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Title: eRHIC Beam Scrubbing

Abstract

We propose using beam scrubbing to mitigate the electron cloud e ect in the eRHIC. The bunch number is adjusted below the heat load limit, then it increases with the reduced secondary electron yield resulted from the beam scrubbing, up to the design bunch number. Since the electron density threshold of beam instability is lower at the injection, a preliminary injection scrubbing should go rst, where large chromaticity can be used to keep the beam in the ring for scrubbing. After that, the beam can be ramped to full energy, allowing physics scrubbing. Simulations demonstrated that with beam scrubbing in a reasonable period of time, the eRHIC baseline design is feasible.

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:
1392223
Report Number(s):
BNL-114220-2017-IR
R&D Project: KBCH139; KB0202011
DOE Contract Number:
SC0012704
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Zhang, S. Y. eRHIC Beam Scrubbing. United States: N. p., 2017. Web. doi:10.2172/1392223.
Zhang, S. Y. eRHIC Beam Scrubbing. United States. doi:10.2172/1392223.
Zhang, S. Y. 2017. "eRHIC Beam Scrubbing". United States. doi:10.2172/1392223. https://www.osti.gov/servlets/purl/1392223.
@article{osti_1392223,
title = {eRHIC Beam Scrubbing},
author = {Zhang, S. Y.},
abstractNote = {We propose using beam scrubbing to mitigate the electron cloud e ect in the eRHIC. The bunch number is adjusted below the heat load limit, then it increases with the reduced secondary electron yield resulted from the beam scrubbing, up to the design bunch number. Since the electron density threshold of beam instability is lower at the injection, a preliminary injection scrubbing should go rst, where large chromaticity can be used to keep the beam in the ring for scrubbing. After that, the beam can be ramped to full energy, allowing physics scrubbing. Simulations demonstrated that with beam scrubbing in a reasonable period of time, the eRHIC baseline design is feasible.},
doi = {10.2172/1392223},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 6
}

Technical Report:

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  • eRHIC, a future electron-ion collider developed at BNL, aims to provide electron-ion collisions by adding a new electron accelerator to the existing RHIC ion accelerator rings [1]. Possible options for accelerating high average current electron beam include an energy-recovery linac (ERL) or a storage ring. Since the proton beam is circulating in the accelerator ring, corresponding collision schemes are called as the linac-ring and the ring-ring. The electron accelerator option based on the electron storage ring was studied on earlier stages of eRHIC design [2].
  • Several designs have been built and operated of microwave cyclotron autoresonance accelerators (CARA's) with electron beam parameters suitable for remediation of pollutants in flue gas emissions from coal-burning power plants. CARA designs have also been developed with a TW-level 10.6 micron laser driver for electron acceleration from 50 to 100 MeV, and with UHF drivers for proton acceleration to over 500 MeV. Dose requirements for reducing SO2, NOx, and particulates in flue gas emissions to acceptable levels have been surveyed, and used to optimize the design of an electron beam source to deliver this dose.
  • The eRHIC BNL summer meeting was held at BNL from June 26 to July 14, 2000. The meeting was very informal with only two talks a day and with ample time for discussions and collaborations. Several of the theory talks focused on the issue of saturation of parton distributions at small x--whether screening effects have already been seen at HERA, the relation of saturation to shadowing, and on the various signatures of a proposed novel state of matter--the Colored Glass Condensate--that may be observed at eRHIC. A related topic that was addressed was that of quantifying twist four effects, andmore » on the relevance of these for studies of energy loss. Other issues addressed were coherence effects in vector meson production, anti-quark distributions in nuclei, and the relevance of saturation for heavy ion collisions. There were, also, talks on the Pomeron--the relevance of instantons and the non-perturbative gluon condensate to constructing a Pomeron. On the spin physics side, there were talks on predictions for inclusive distributions at small x. There were also talks on Skewed Parton Distributions and Deeply Virtual Compton Scattering. Though most of the talks were theory talks, there were also several important experimental contributions. A preliminary detector design for eRHIC was presented. Studies for semi-inclusive measurements at eRHIC were also presented. The current status of pA scattering studies at RHIC was also discussed. The eRHIC summer meeting provided a vigorous discussion of the current status of eRHIC studies. It is hoped that this document summarizing these discussions will be of use to all those interested in electron nucleus and polarized electron-polarized proton studies.« less