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EIC Update

R. D. McKeown

Presentation to JSA Science CouncilJanuary 7, 2011

(Thanks to R. Ent, A. Hutton, H. Montgomery, others)

Electron Ion Collider

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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)

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EIC Physics Overview

12 GeV

• 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.

mEICEIC

MEIC : Medium Energy EIC

Three compact rings:• 3 to 11 GeV electron• Up to 12 GeV/c proton (warm)• Up to 60 GeV/c proton (cold)

low-energy IP

polarimetry

medium-energy IPs

Note: conservative assumptions• 6T dipole fields• Synch. Power < 20 kW/m • bmax < 2.5 km

Facilities embarking on long-term planning exercise, MEIC/ELIC is part of this.

EIC Site Plan

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BNL Design (2010)

STAR

ePHEN

IX6

6 pass 2.5 GeV ERL Coherent

e-cooler

Beam-dump

Polarized e-guneRHIC detector

RHIC: 325 GeV p or 130 GeV/u Au

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)

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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

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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

High Luminosity over a range of energies

(Challenge to accelerator physics!)

MEIC & ELIC: Luminosity Vs. CM Energy

e + p facilities

e + A facilities

For 1 km MEIC ring

solenoid

electron FFQs50 mrad

0 mrad

ion dipole w/ detectors

ions

electrons

IP

ion FFQs

2+3 m 2 m 2 m

Detect particles with angles below 0.5o beyond ion FFQs and in arcs.

detectors

Detect particles with angles down to 0.5o before ion FFQs.Need 1-2 Tm dipole.4-

5m

Central detector

EM

Ca

lorim

ete

r

Ha

dro

n C

alo

rime

ter

Mu

on

De

tect

or

EM

Ca

lorim

ete

r

Solenoid yoke + Muon DetectorTOF

HT

CC

RIC

H

RICH or DIRC/LTCC

Tracking

2m 3m 2m

Solenoid yoke + Hadronic Calorimeter

Very-forward detectorLarge dipole bend @ 20 meter from IP (to correct the 50 mr ion horizontal crossing

angle) allows for very-small angle detection (<0.3o)

Full Acceptance Detector

7 meters

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)

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week dates topics

1 13–17 Sept Workshop on "Perturbative and Non-Perturbative Aspects of QCD at Collider Energies"

2 20–24 Sept open conceptual issues: factorization and universality, spin and flavor structure, distributions and correlations

3–5 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

6–7 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"

2010 INT WorkshopOrganizers:Daniel BoerKVI, University of Groningen

Markus DiehlDESY

Richard MilnerMIT

Raju VenugopalanBrookhaven National Laboratory

Werner VogelsangUniversity of Tübingen

EIC Realization Imagined Activity Name 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

(Mont@INT)

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

• 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

(BMcK@INT)

Producing an EIC Science White Paper to Make the Case for Mission Need

Defining Down-Select Criteria and Mechanism for Facility Design

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

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)

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• Meet in conjunction with DIS2011 in April

• Increase accelerator physics membership?

• Possible charge:“Provide guidance on focusing the scientificcase and priorities for the EIC.”

EICAC

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…