eRHIC Accelerator Design

The design of the accelerator is being developed by scientists from Brookhaven National Laboratory (BNL), MIT-Bates, Budker Institute of Nuclear Physics (BINP - Russia) and Deutsches Elektronen-Synchrotron (DESY - Germany).

Recent Events:

- PAC 2007 conference (Albuquerque, June 2007). EIC Talk (by V. Ptitsyn). Several poster presentations.
- NSAC LRP Resolution Committee meeting (May 4, 2007) provided EIC recommendations.
- Electron-Ion Collider Collaboration Meeting at MIT (April 6-7, 2007).
- APAC 2007 conference (Indore, India, January 2007). EIC Talk (by I. Ben-Zvi).
- "eRHIC Accelerator Position Paper" for NSAC Long Range Plan has been issued in January 2007. The paper presents the current status of the accelerator design.
- SPIN'06 International Symposium, Oct 1-8, 2006. Of especial interest for the eRHIC design are the advances of Polarized Electron Source developments, which were reported in corresponding Parallel session.

Upcoming Events:

- Electron Beam Polarimetry Workshop (Ann Arbor, August 23-24 2007).
- XII^th International Workshop on Polarized Sources, Targets & Polarimetry (BNL, September 10-14 2007).
- Electron-Ion Collider Collaboration Meeting (Stony Brook, December 7-8, 2007).

Physics Requirements

• To provide electron-proton and electron-ion collisions.
• Should be able to provide the beams in following energy ranges:
  • 5-10 GeV polarized electrons OR 10 GeV polarized positrons
  • 50-250 GeV polarized protons OR 100 GeV/u gold ions
• Luminosities
  •  in 10³² - 10³⁴ cm^-2s^-1 region for e-p
  •  in 10³⁰ - 10³³ cm^-2s^-1 region for e-Au collisions
• 70% polarization degree for both lepton and proton beams.
• Longitudinal polarization in the collision point for both lepton and proton beams.
• Further information on physics part of the project at www.bnl.gov/eic

There are two eRHIC design lines under the development: linac-ring and ring-ring.

Linac-Ring Design Line

• Based on superconducting energy recovery electron linac (ERL).
• Electron beam is used for collisions just once. No beam-beam limitation for electron beam.
• Multiple interaction points are possible.
• Electron polarization is achievable in the whole energy range, including longitudinal polarization.
• IR design has less restrictions that in ring-ring design.
• Considerably higher luminosity than in the ring-ring design may be achieved.
• Small storage ring can be added for positron storage.
• Considerable R&D for polarized electron source is needed.

Ring-ring Design Line

• The electron ring of 1/3 of the RHIC ion ring circumference  added to the RHIC Accelerator Complex.
• The electron injection system includes a polarized electron source and 10 GeV energy linac.
• The collisions are produced in one interaction point.
• The positrons can be used in the same degree as electrons.
• Longitudinal polarization is produced by using local spin rotator insertion in the interaction region.
• No considerable R&D required.

Last Modified: January 31, 2008
Please forward all questions about this site to: Vadim Ptitsyn

One of ten national laboratories overseen and primarily funded by the Office of Science of the U.S. Department of Energy (DOE), Brookhaven National Laboratory conducts research in the physical, biomedical, and environmental sciences, as well as in energy technologies and national security. Brookhaven Lab also builds and operates major scientific facilities available to university, industry and government researchers. Brookhaven is operated and managed for DOE’s Office of Science by Brookhaven Science Associates, a limited-liability company founded by Stony Brook University, the largest academic user of Laboratory facilities, and Battelle, a nonprofit, applied science and technology organization.

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