Charge and Overview: What are we trying to accomplish during this review L. Cardman

Upgrade Configuration ParameterSpecification Number of passes for Hall D5.5 (add a tenth arc) Max. Energy to Hall D12.1 GeV (for 9 GeV photons) Number of passes for Halls A/B/C5 Max. Energy to Halls A/B/C11.0 GeV New Cryomodules10 (5 per linac) Central Helium Liquefier upgrade10.1 kW (from present 4.8 kW) Scope of the proposed project includes the accelerator energy upgrade, a new experimental Hall and associated beamline, and upgrades to the existing three experimental Halls. 12 GeV Upgrade 12 GeV Project Status

Accelerator: Upgrade cryomodule design and RF controls: Testbed: FEL-3 Cryomodule and Low Level RF control system ­ successful testing in Nov ‘04 of Cornell LLRF system components ­ next: testing w/beam in Jan ‘05 Testbed: Second generation Upgrade cryomodule (Renascence): ­ March/April ’05 first 12 GeV-specific performance bench tests ­ July ’05 installation in CEBAF Experimental Equipment: Superconducting Magnets: Feasibility study for superconducting spectrometer magnets (Halls A&C) ­ contract awarded to Budker Institute, report due April Test of superconducting magnet cable (Halls A&C) ­ contract awarded to BNL for testing of reels in early Feb Design and prototype of 5 KA current lead (Halls A&C) ­ contract awarded to American Magnetics in Tennessee, report due in April Detector Prototyping: Silicon Vertex Tracker (Hall B) ­ effort in progress at JLab Central and Forward Drift Chambers (Hall D) ­ sustained effort at Carnegie Mellon and JLab 12 GeV R&D (FY04/05) Is Progressing Well

Project is on schedule for a CD-1 approval in Sept. 05 Key events: JLab: GlueX Detector review (10/04) - complete JLab: GlueX solenoid assessment (11/04) -complete JLab: “Alternatives Analysis” - Hall Layout Options (12/04) - complete JLab: Spectrometer Options (1/05) - complete JLab PAC27 Review: “new” science motivations (1/05) JLab: draft project CDR submitted to DOE Site Office (3/05) DOE: Review of 12 GeV Science Program (4/05) JLab: Cryomodule Design Review (4/05) DOE: “Lehman” review (7/05) DOE: Office of Science “ESAAB review” for CD-1 approval (9/05) 12 GeV Project Status

Why are We Here Today and What are We Trying to Accomplish? The entire community has continued its effort to refine the proposed physics program and has also developed new physics opportunities that would become feasible, resulting in an even richer program The Hall Equipment designs have been refined considerably, but budgetary pressures are likely to force us to reduce the scope of the project, and this must be done with great care to ensure we maximize the physics potential of the Upgrade With CD-0 in hand, and both a “Science Review” and the CD-1 review coming this spring and summer, we must once again review the science and the best way to formulate it for presentation to the larger community Any such effort needs and deserves the kind of serious scientific peer review that PAC16 provided for the White Paper and PAC23 provided for the pCDR Important details include: ­ The DOE CDR which will define the project put forth for the CD-1 Review will require a chapter on scientific motivation and experimental equipment which is roughly comparable to the Executive Summary of the pCDR ­ The Editorial Board that wrote the pCDR has been expanded somewhat for this document ­ This document must be produced by about the end of January, so PAC27 Review is most timely The PAC27 12 GeV session will: - review the proposed expanded science program (today), and - continue the evaluation of the experimental equipment plans (tomorrow)

The Charge for the PAC27 Review of the Upgrade Plans Comment on the intellectual framework presented for the revised outline for the 12 GeV CDR. Is this the best way to present the science case to DOE and to the larger nuclear physics community? Are there flaws or omissions in the framework? Is the new framework an improvement over that of the pCDR? Review the new research programs that are under consideration for being highlighted in the executive summary of the CDR Do they represent compelling science that must be done to advance our understanding of nuclear physics? Have we omitted key science initiatives that should be used as primary motivations for the Upgrade? Is the experimental equipment proposed well matched to the key physics experiments motivating the upgrade? In cases where an experiment or program is proposed for more than one set of equipment, are the differences in capability and physics reach of the equipment essential for getting all of the physics, important for getting as much physics as possible, or simply useful in that, for example, an experiment could be done somewhat faster with one hall equipment compared to another? Comment on the merits and drawbacks of possible alternate equipment configurations. A variety of possible alternate equipment configurations under consideration will be presented. For each, identify the essential physics programs that it can support roughly at the level of the equipment presented in the pCDR, and for each identify critical physics “reach” that will be lost. Comment on the Letter of Intent received on a dedicated DVCS detector.

The Intellectual Framework of the Science Driving 12 GeV (As Presented to NSAC) The upgrade opens many new scientific opportunities and provides a broad, qualitative enhancement of the present program Key New Physics: Understanding Confinement (a program of meson spectroscopy) (defines E max and requires the addition of “Hall D”) Detailed Mapping of the Quark and Gluon Wave Functions of the Nucleons via measurements of: - Deep Exclusive Scattering, and - Deep Inelastic Scattering as x  1 for a large range of Q 2 (MAD in Hall A, CLAS upgrade to L =10 35, SHMS in Hall C) Extension of the present program of Spin, Hadron and Nuclear Microscopy to higher Q 2 (Higher energies also increase throughput for many experiments now run with 6 GeV beams)

The Science Case for the Upgrade As developed for the pCDR following PAC23 (1/03) Review, and then presented to the NSAC Facilities Subcommittee: Gluonic Excitations and the Origin of Confinement Developing a Unified Description of Hadron Structure ­ The GPDs as Accessed via Deep(ly) Exclusive Reactions ­ Valence Quark Structure and Parton Distributions ­ Form Factors – Constraints on the GPDs ­ Other Topics in Hadron Structure The Physics of Nuclei ­ The Short-Range Behavior of the N-N Interaction and Its QCD Basis ­ Identifying and Exploring the Transition from the Nucleon/Meson Description of Nuclei to the Underlying Quark/Gluon Description Symmetry Tests in Nuclear Physics ­ Standard Model Tests ­ Spontaneous Symmetry Breaking

pCDR Science Program Structure Gluonic Excitations and the Origin of Quark Confinement The Fundamental Structure of the Nuclear Building Blocks ­ Form Factors - Constraints on the Generalized Parton Distributions ­ Valence Quark Structure and Parton Distributions ­ The Generalized Parton Distributions as Accessed via Deeply Exclusive Reactions ­ Other Topics in Hadron Structure Transverse parton distributions The extended GDH integral and sum rule Duality: the transition from a hadronic to a quark-gluon description of Deep Inelastic Scatterin The Physics of Nuclei ­ The Short-Range Behavior of the N − N Interaction and Its QCD Basis Color transparency Learning about the NN force by the measurement of the threshold N cross section and by searching for -nucleus bound states Quark propagation through cold QCD matter: nuclear hadronization and transverse momentum broadening Short-range correlations in nuclei: the nature of QCD at high density and the structure of cold, dense nuclear matter. ­ Identifying and Exploring the Transition from the Meson/Nucleon Description of Nuclei to the Underlying Quark and Gluon Description The onset of scaling behavior in nuclear cross sections Helicity conservation in nuclear reactions The charged pion form factor Pion photoproduction from the nucleon and in the nuclear medium Symmetry Tests in Nuclear Physics ­ Standard Model Tests ­ Properties of Light Pseudoscalar Mesons via the Primakoff Effect

Proposed CDR Science Structure QCD in the Confinement Regime ­ Gluonic Excitations and the Origin of Quark Confinement ­ Spectroscopy (light mesons and baryons) The Fundamental Structure of the Nuclear Building Blocks ­ Form Factors - Constraints on the Generalized Parton Distributions ­ Valence Quark Structure and Parton Distributions ­ The Generalized Parton Distributions as Accessed via Deeply Exclusive Reactions ­ Transverse Parton Distributions as Accessed via Semi-Inclusive Deep Inelastic Scattering ­ Other Topics in Hadron Structure The extended GDH integral and sum rule Duality: the transition from a hadronic to a quark-gluon description of Deep Inelastic Scattering The Physics of Nuclei ­ The Emergence of Nuclei from QCD The onset of scaling behavior in nuclear cross sections Helicity conservation in nuclear reactions Learning about the NN force by the measurement of the threshold J/  -N cross section and by searching for J/  - nucleus bound states Short-range correlations in nuclei: the nature of QCD at high density and the structure of cold, dense nuclear matter ­ Fundamental QCD Processes in the Nuclear Arena Color transparency Pion photoproduction from the nucleon and in the nuclear medium Quark propagation through cold QCD matter: nuclear hadronization and transverse momentum broadening Symmetry Tests in Nuclear Physics ­ Standard Model Tests ­ Properties of Light Pseudoscalar Mesons via the Primakoff Effect

Presentations Today by Editorial Board Members Overview of 12 GeV Upgrade ScienceT. Thomas The GlueX program (hybrids and light meson spectroscopy)A. Dzierba Hadron StructureX. Ji The Physics of NucleiW. Brooks Symmetry Tests in Nuclear PhysicsK. Kumar Presentation and discussion of two physics programs proposed for an expanded role in the CDR: ­ Hadron Spectroscopy S. Stepanyan ­ SIDIS H. Avakian

Points from the PAC27 Charge Relevant to Today’s Talks Comment on the intellectual framework presented for the revised outline for the 12 GeV CDR. Is this the best way to present the science case to DOE and to the larger nuclear physics community? Are there flaws or omissions in the framework? Is the new framework an improvement over that of the pCDR? Review the new research programs that are under consideration for being highlighted in the executive summary of the CDR Do they represent compelling science that must be done to advance our understanding of nuclear physics? Have we omitted key science initiatives that should be used as primary motivations for the Upgrade?

Experimental Apparatus for the Upgrade (as of PAC23 and the pCDR) The GlueX experiment The addition of a large solid angle, moderate resolution spectrometer to the HRS in Hall A The upgrade of CLAS to 10x the luminosity, and to the capability of handling the higher multiplicities anticipated The addition of a high momentum spectrometer (capable of accepting particles at small angles and at momenta approaching the beam momentum) to the HMS in Hall C The equipment proposed for the 12 GeV Upgrade included an array of devices that were optimized for the science program as we foresee it now:

The 12 GeV Upgrade as Presented in the pCDR has Enhanced Complementary Equipment in Halls A, B, & C and a New Hall D Medium Acceptance Detector (MAD) providing large solid angle at high luminosity CLAS upgraded to higher (10 35 ) luminosity and coverage Super High Momentum Spectrometer (SHMS) at high luminosity and forward angles 9 GeV tagged polarized photons and a 4  hermetic detector A CD B

PAC 23 Reviewed This Plan and Endorsed It as Providing a Well-Balanced Set of Complementary Instruments “The PAC endorses the overall plan for the major new instrumentation as being required to implement the new physics program and therefore recommends that the major components in all four halls be implemented.”

However……. We Must Look Critically at the Instrument Plan to Ensure that We Have Optimized the Physics Capabilities of the Upgrade in the (Likely) Event We Must Reduce the Total Cost of the Facility to Live Within Budgetary Constraints

Presentations Tomorrow on Experimental Equipment Options Review of Base Equipment Plans, and Summary of Alternate Equipment Options Considered and Under ConsiderationL. Cardman Spectrometer Options, Comments from the Mini-ReviewR. Holt Upgrade Physics in Hall AK. de Jager Upgrade Physics in Hall CR. Ent CLAS12: Options and PhysicsV. Burkert GlueX: Options and PhysicsE. Smith

Is the experimental equipment proposed well matched to the key physics experiments motivating the upgrade? In cases where an experiment or program is proposed for more than one set of equipment, are the differences in capability and physics reach of the equipment essential for getting all of the physics, important for getting as much physics as possible, or simply useful in that, for example, an experiment could be done somewhat faster with one hall equipment compared to another? Comment on the merits and drawbacks of possible alternate equipment configurations. A variety of possible alternate equipment configurations under consideration will be presented. For each, identify the essential physics programs that it can support roughly at the level of the equipment presented in the pCDR, and for each identify critical physics “reach” that will be lost. Comment on the Letter of Intent received on a dedicated DVCS detector. Points from the PAC27 Charge Relevant to Tomorrow’s Talks

DOE Critical Decision-0 Approval period CD-0 to CD-1 is referred to as project “definition phase” DOE Order Project Management Manual CD-0 Approve Mission Need CD-1 Approve Preliminary Baseline Range CD-2 Approve Performance Baseline Range CD-3 Approve Start of Construction CD-4 Approve Start of Operations CDR R&D PED Construction Operation FY 04/05 FY FY FY FY 11/12 Phases Planning Dates