EIC Update
R. D. McKeown
Presentation to JSA Science Council
January 7, 2011
(Thanks to R. Ent, A. Hutton, H. Montgomery, others)
1
Electron Ion Collider
NSAC 2007 Long-Range Plan:
“An Electron-Ion Collider (EIC) with
polarized beams has been embraced by
the U.S. nuclear science community as
embodying the vision for reaching the next
QCD frontier. EIC would provide unique
capabilities for the study of QCD well
beyond those available at existing facilities
worldwide and complementary to those
planned for the next generation of
accelerators in Europe and Asia.”
• EIC “collaboration” – Milner & Deshpande contact persons, involves
BNL and Jlab communities
• JLAB and BNL are both developing “staged” designs
• EICAC advisory comm. → Mont & Vigdor(BNL AD)
2
EIC Physics Overview
• Hadrons in QCD are relativistic many-body systems, with a fluctuating number of
elementary quark/gluon constituents and a very rich structure of the wave function.
• With 12 GeV we study mostly the
valence quark component, which
can be described with methods of
nuclear physics (fixed number of
particles).
• With an (M)EIC we enter the region where the
many-body nature of hadrons, coupling to vacuum
excitations, etc., become manifest and the
theoretical methods are those of quantum field
theory. An EIC aims to study the sea quarks, gluons,
and scale (Q2) dependence.
mEIC
EIC
12 GeV
3
MEIC : Medium Energy EIC
medium-energy
IPs
polarimetry
low-energy IP
Three compact rings:
• 3 to 11 GeV electron
• Up to 12 GeV/c proton (warm)
• Up to 60 GeV/c proton (cold)
Note: conservative assumptions
• 6T dipole fields
• Synch. Power < 20 kW/m
• bmax < 2.5 km
EIC Site Plan
Facilities embarking on
long-term planning
exercise, MEIC/ELIC is
part of this.
BNL Design (2010)
Polarized e-gun
Beam-dump
eRHIC detector
6 pass 2.5 GeV ERL
RHIC: 325 GeV p
or 130 GeV/u Au
STAR
6
6
Recent Events
• EICAC Report (Nov. 2009):
- develop “unimpeachable” science case
- Jlab concept less mature
• Jlab increases accelerator design effort to develop conservative
“costable” MEIC design (2010)
• Jlab users organize workshops in spring 2010
• EIC collaboration meeting at Catholic U. (July 2010)
• DOE-ONP awards accelerator R&D
• Accelerator division internal review of Jlab design
• 10 week program at Institute for Nuclear Theory – fall 2010
• Vigdor proposes detector R&D
• (Next EICAC – April 2011)
JLAB EIC Workshops
• Nucleon spin and quark-gluon correlations: Transverse spin, quark and gluon orbital motion,
semi-inclusive processes (Duke U., March 12-13, 2010 )
• 3D mapping of the glue and sea quarks in the nucleon (Rutgers U., March 14-15, 2010)
• 3D tomography of nuclei, quark/gluon propagation and the gluon/sea quark EMC effect
(Argonne National Lab, April 7-9, 2010)
• Electroweak structure of the nucleon and tests of the Standard Model
(College of W&M , May 17-18, 2010)
• EIC Detectors/Instrumentation
(JLab, June 04-05, 2010)
4/5 will produce white paper for publication
8
General Emergent Theme
Experimental study of multidimensional
distribution functions that map out the
quark/gluon properties of the nucleon, including:
(quark) flavor
spin and orbital angular momentum
longitudinal momentum
transverse momentum and position
(Challenge to accelerator physics!)
9
MEIC & ELIC: Luminosity Vs. CM Energy
e + p facilities
e + A facilities
For 1 km
MEIC ring
Full Acceptance Detector
7 meters
detectors
solenoid
ion dipole w/ detectors
IP
0 mrad
electron FFQs
50 mrad
2+3 m
2m
electrons
2m
Central detector
TOF
Tracking
EM Calorimeter
Hadron Calorimeter
Muon Detector
RICH or DIRC/LTCC
RICH
HTCC
EM Calorimeter
4-5m
Solenoid yoke + Muon Detector
Detect particles with
angles down to 0.5o
before ion FFQs.
Need 1-2 Tm dipole.
Detect particles with
angles below 0.5o
beyond ion FFQs and
in arcs.
Very-forward detector
Large dipole bend @ 20 meter from IP
Solenoid yoke + Hadronic Calorimeter
(to correct the 50 mr ion horizontal crossing angle)
allows for very-small angle detection (<0.3o)
2m
3m
2m
Internal MEIC Review (hosted by Andrew Hutton)
MEIC design review on 09/15 & 09/16 by two excellent (friendly) reviewers:
Georg Hoffstaetter (Cornell) & Alex Chao (SLAC)
1)
Very good that manpower involved in EIC has been increased, that outside experts from
ANL and SLAC have been attracted for consultation, and that CASA has focused on this
accelerator during recent months.
2)
Hardly any technical R&D topics have been shown on the first day. The RF for BNL’s coherent
electron cooling was the only R&D topic mentioned.
3)
The figure 8 ion ring design appears very flexible and a strong feature of the JLAB EIC.
4)
The amount of effort appropriate to compete in a down selection with BNL in 2013 is on
the order of at least 10 FTE per year. This is already apparent from the fact that the design and R&D
has to compete with significantly more than 10 FTE preparing the BNL EIC design
.
5)
The collaborations with BNL on the RF of a coherent electron cooler, with ANL on low energy ion
acceleration, and with Novosibirsk on ion polarization are very useful. Additional collaborations
for spin manipulation, e.g. with the COSY accelerator, could be quite effective, particularly if the figure
8 design could be tested experimentally in the long run.
MEIC Accelerator R&D Funded by DOE NP
• Program: DOE Financial Assistance Funding Opportunity Announcement LAB 10-339
Research & Development for Next Generation Nuclear Physics Accelerator Facilities
• CASA proposal (submitted July 2010): Advanced Electron Ion Collider Design
(PI: Geoffrey Krafft)
(Funding request: $4,480k over three years)
• Award: total $900k for one year
– $500k from FY2010 fund, available immediately (received Nov., 2010)
– $400k from FY2011 fund, subjected to federal budget appropriation process
• Revised tasks that are consistent with the recommended funding level
– Project 1. Collider Ring Designs
– Project 2: Development of a Spin Manipulation and Stabilization System
• CASA plan for using this grant
– Support three new postdoctoral fellows in CASA for MEIC studies ($100k x 3)
– Support collaborations ($150k first year, $100k second year)
(IR design: M. Sullivan, SLAC; Polarized beam: D. Barber, DESY, A. Kondratenko, Russia; RF
system, B. Rimmer, JLab)
– Support graduate students (TBD)
• Other awards for MEIC Accelerator R&D
– Argonne National Lab, $270k, for MEIC ion linac & small booster design (PI: P. Ostroumov)
– Northern Illinois Univ., $75k, for MEIC electron cooling studies (PI: B. Erdelyi)
2010 INT Workshop
Organizers:
Daniel Boer
KVI, University of Groningen
Markus Diehl
DESY
Richard Milner
MIT
week
dates
topics
13–17 Sept
Workshop on "Perturbative
and Non-Perturbative
Aspects of QCD at Collider
Energies"
20–24 Sept
open conceptual issues:
factorization and universality,
spin and flavor structure,
distributions and correlations
27 Sept –15 Oct
small x, saturation,
diffraction, nuclear effects;
connections to p+A and A+A
physics;
fragmentation/hadronization
in vacuum and in medium
18–29 Oct
parton densities (unpolarized
and polarized),
fragmentation functions,
electroweak physics
8–9
1–12 Nov
longitudinal and transverse
nucleon structure; spin and
orbital effects (GPDs, TMDs,
and all that)
10
15–19 Nov
Workshop on "The Science
Case for an EIC"
1
2
3–5
Raju Venugopalan
Brookhaven National Laboratory
6–7
Werner Vogelsang
University of Tübingen
14
EIC Realization Imagined
Activity Name
(Mont@INT)
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
12 Gev Upgrade
FRIB
EIC Physics Case
NSAC LRP
EIC CD0
EIC Machine
Design/R&D
EIC CD1/Downsel
EIC CD2/CD3
EIC Construction
Note: 12 GeV LRP recommendation in 2002 – CD3 in 2008
Some Impressions from INT
• “Golden Topics” (my term)
- Discover the collective effects of gluons in
nuclei
- Map the spin and spatial structure of quarks
and gluons in nucleons
possible golden expt.: low x g1(x) → Dg(x)
• “Silver Topic”
Understand the emergence of hadronic matter
from quarks and gluons
• Electroweak topic still embryonic
• Much HW to do
A Final Word
(BMcK@INT)
•
We are on a good path to put the EIC forward at the next NSAC Long Range
Plan
•
We still need additional work, building on the discussions at the INT
program, to produce a much more compelling physics justification
•
We need to sharpen the arguments for a more general audience
•
How could we expand the community of interested physicists?
•
We need to continue to work together to advance the physics case for this
exciting new facility
Producing an EIC Science White Paper to Make the Case for Mission Need
 Use INT Program, writeup as launching pad for White Paper putting
flesh on above bones for non-expert audience
 Aim for 1st draft in Fall 2011, in anticipation of possible LRP Town
Meetings in Fall 2012
 Suggest JLab, BNL, EICC appoint ~6-member balanced Steering
Committee to establish milestones and (calculation/
simulation/writing) assignments, oversee White Paper preparation,
focus and editing
Defining Down-Select Criteria and Mechanism for Facility Design
 Define criteria and review mechanism (common reviewers for both
designs) well in advance of LRP – ONP must be involved
 Need “apples-to-apples” comparisons of performance vs. cost vs.
timeline for both 1st stages and (roughly) later upgrades
 Both designs need to include defensible estimates of technical risk and
risk mitigation strategies/costs for achieving goals
 IR designs, detector integration, background environments need to be
included in evaluations
S. Vigdor (BNL) INT workshop
S. Vigdor (BNL)
EICAC
• Meet in conjunction with DIS2011 in April
• Increase accelerator physics membership?
• Possible charge:
“Provide guidance on focusing the scientific
case and priorities for the EIC.”
20
Jlab Position
• Jlab accelerator team is working effectively to
develop a novel design. They have increased
effort over the last year and are on track to
deliver a costed design in fall 2011.
• Jlab users are interested and engaged but are
conflicted with 12 GeV commitments.
• Jlab scientific effort is small relative to BNL
(also 12 GeV commitments)
• BNL has invested LDRD…