MEIC R&D
Yuhong Zhang
Review 09/2010
Page 1
Outline
• MEIC R&D Issues
• View 1: EIC AC Recommendations
• View 2: MEIC Design Status
• View 3: Accelerator Technology Challenges
• Present Plan
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CASA/JLab Internal Resources
External Collaborations
Research Proposals
Proposed Research Focuses
• Path Forward and Open Questions
Review 09/2010
Page 2
EIC Advisory Committee Recommendations
• Highest priority
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Most critical
Design of JLab EIC
High current (e.g., 50 mA) polarized electron gun
Demonstration of high energy-high current recirculation ERL
Beam-beam simulations for EIC
Polarized 3He production and acceleration
Coherent electron cooling
• High priority, but could wait until decision made
• Compact loop magnets
• Electron cooling for JLab concepts
• Traveling focusing scheme
Only for very low ion
energy, 12 GeV or less
(it is not clear what the loss in performance would be if it doesn’t work; it is not a show stopper if it doesn’t)
• Development of eRHIC-type SRF cavities
• Medium priority
• Crab cavities
• ERL technology development at JLab
Review 09/2010
Page 3
MEIC Machine Design Status
• Short term design goal (by next EIC AC meeting, 12/2010)
• We are committed to completing a MEIC design with sufficient technical details
• Short term technical Strategy
• Limiting as many MEIC design parameters as we can within or close to the
present state-of-art in order to minimize technical uncertainty and required R&D
• Mid-term design goal (by next NSAC Long Range Plan, ~2013)
• A complete design supported with solid R&Ds & a zero-th order design report
• Unfinished design tasks (under the short term goal)
Electron complex
• RF system
• Polarization lifetime by spin tracking
• Instability (feedback for multi-bunches)
Ion complex
• Polarized and un-polarized ion sources
• SRF Linac & pre-booster (cooling, tracking)
• Design of big boosters
• RF system in boosters and collider ring
Review 09/2010
• Ion polarization (scheme, tracking)
• Electron cooling (cooler design, simulations)
• Instabilities, electron cloud
Interaction region
• IR design, magnet, background
• Tracking studies and dynamics aperture
• Crab crossing and cavities
• Beam-beam simulations
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Accelerator Technology Challenges
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Interaction region design and limits with chromatic compensation
Electron cooling
Crab crossing and crab cavity
Forming high intensity low energy ion beam
Beam-beam effect
Depolarization (including beam-beam) and spin tracking
Traveling focusing for very low energy ion beam
Level of
R&D
Low-to-Medium Energy
(12x3 GeV/c) & (60x5 GeV/c)
High Energy
(up to 250x10 GeV)
Challenging
Semi
Challenging
Likely
Know-how
Electron cooling
Traveling focusing (for ion energies ~12 GeV)
Electron cooling
IR design/chromaticity
Crab crossing/crab cavity
High intensity low energy ion beam
IR Design/chromaticity
Crab crossing/crab cavity
High intensity low energy ion beam
Spin tracking
Beam-Beam
Spin tracking
Beam-beam
Review 09/2010
Page 5
Three Most Outstanding R&D Issues
• Electron cooling of medium energy ions
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Effectiveness/efficiency of electron cooling at medium ion energy
Design of circulator cooler ring, development of fast kicker
High average beam current (ampere class) ERL
Dynamics of electron beam in a circulator ring & long term space charge effect
Dynamics of two coupled beams (cooling electrons and ions)
• Formation of high average current ion beams with high
bunch repetition rate, small emittance and short bunch
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Negative (H-, D-) ion sources and strip injections
Ion SRF linac
Low energy (~100 keV) long bunch (DC) electron cooling
Space charge effect in pre-booster
• Ion polarization in a Figure-8 ring
• Demonstrate advantage of a Figure-8 ring for ion beams
• Polarized deuteron beam
Review 09/2010
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JLab MEIC Accelerator Design Team
• CASA (core team members)
• Alex Bogacz, Pavel Chevtsov (leaving), Slava Derbenev, Geoff Krafft, Rui Li,
Vasiliy Morozov, Balsa Terzic, Byung Yunn, Yuhong Zhang
one graduate student (Hisham Sayed)
• Approximately 4.35 FTE
• Expertise: mostly theoretical/computational, some operational (on linac & ERL)
linear optics, recirculated linac, ERL, instability, collective effects
polarization theory, electron cooling theory, beam-beam simulations
• New postdoc/staffs: up to 2 to 3 in the near future (pending grant applications)
• Within JLab
• RF system: Frank Marhauser, Bob Rimmer, Haipeng Wang
• Polarized electron source and photo-injector: Matt Poelker
• Expertise critically needed
• Proton/ion beams, ion source and linac, storage ring, ring-ring collider
• Situation changed significantly after arriving of two ion beam/collider experts:
Fulvia Filat and Todd Satogata
Review 09/2010
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External Collaborations
• IR/detector design
M. Sullivan (SLAC)
• Ion sources
V. Dudnikov, R. Johnson (Muons, Inc)
V. Danilov (ORNL)
• SRF Linac/Pre-booster
S. Manikonda, P. Ostroumov* (ANL)
B. Erdelyi (NIU)
• Beam-beam simulation
J. Qiang (LBNL)
• Electron cooling simulation
D. Bruhwiler (Tech X) (supported by SciDAC)
• Polarization
A. Kondratenko (Novosibirsk)
• Electron spin tracking
D. Barber (DESY)
Review 09/2010
(supported by SciDAC)
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Submitted Research Proposal
Proposal Title: Advanced Electron Ion Collider Design
Program: Research and Development for Next Generation Nuclear
Physics Accelerator Facilities
(DOE Financial Assistance Funding Opportunity Announcement LAB 10-339)
Amount request: $4.5M over 3 years
Status: Pending (initial feedback is positive)
Project
1. Collider Ring Design
2. Numerical Simulation of Beam-Beam and Other Beam Dynamics
3. Development of a Spin Manipulation and Stabilization System For a
Future Electron-Ion Collider
4. Development of Advanced Electron Cooling Systems
Review 09/2010
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Present Research Focal Points
We will concentrate R&D efforts on the most critical tasks
(proposed Feb. 2010)
Focal Point 1: Forming high-intensity short-bunch ion beams & cooling
Sub tasks:
Complete design of the RF linac and pre-booster
Ion bunch dynamics and space charge effects (simulations)
Led by Peter Ostroumov (ANL)
Focal Point 2: Electron cooling of medium-energy ion beam
Sub tasks: Electron cooling dynamics (simulations)
Complete design of the ERL-based circulator cooler
Dynamics of cooling electron bunch in an ERL circulator ring
Focal Point 3: Beam-beam interaction
Sub tasks: Include crab crossing and/or space charge
Include multiple bunches and interaction points
Including space charge effect for low ion energy
Review 09/2010
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Path Forward and Strategy
• Short term
by next EIC AC Meeting
~12/2010
• Complete a conceptual design with sufficient technical details
• Plug holes and fill design gaps
• Conservative position on accelerator technology
design completeness over technology innovation & collider performance
• Intermediate term
by next NSAC RLP
~2013
• 1st Half
• Design optimization (still technology conservative)
• Type I R&D: issues which will improve creditability of design and save cost
• 2nd Half
• Design optimization (modest technology forward looking)
• Type II R&D: issues which will improve collider performance and save cost
• Long term
by ZDR/CDR
~2016
• Design optimization, technology aggressive
• Type III R&D: issues for maximum pay-off for best collider performance
Review 09/2010
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Open Questions
• What are the most important R&D issues?
• Given present resources and expertise, how we prioritize
these critical R&D topics?
• What are the reasonably achievable goals for
• Short term R&D, by next EIC AC meeting, Feb. 2011
• Intermediate term R&D, by next NSAC LRP, 2013
• What expertise we should add to the local design team?
• What new external collaborations we should seek to
establish?
Review 09/2010
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