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


           L. Cardman
                       12 GeV Project Status
         Upgrade Configuration
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



                                               Parameter                          Specification
                                               Number of passes for Hall D        5.5 (add a tenth arc)

                                               Max. Energy to Hall D              12.1 GeV
                                                                                  (for 9 GeV photons)
                                               Number of passes for Halls A/B/C   5


                                               Max. Energy to Halls A/B/C         11.0 GeV

                                               New Cryomodules                    10 (5 per linac)

                                               Central Helium Liquefier upgrade   10.1 kW
                                                                                  (from present 4.8 kW)
12 GeV R&D (FY04/05) Is Progressing Well
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 Project Status

    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)
                   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 CEBAF @ 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 Emax 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 Q2
      (MAD in Hall A, CLAS upgrade to L=1035, SHMS in Hall C)

• Extension of the present program of Spin, Hadron and Nuclear Microscopy to
  higher Q2
      (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 Science           T. Thomas

• The GlueX program
  (hybrids and light meson spectroscopy)       A. Dzierba

• Hadron Structure                             X. Ji

• The Physics of Nuclei                        W. Brooks

• Symmetry Tests in Nuclear Physics            K. 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 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 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 12 GeV Upgrade as Presented in the pCDR has Enhanced
Complementary Equipment in Halls A, B, & C and a New Hall D
   A                                               B




  Medium Acceptance Detector (MAD)                  CLAS upgraded to higher (1035)
  providing large solid angle at high luminosity    luminosity and coverage


   C                                               D




  Super High Momentum Spectrometer (SHMS)          9 GeV tagged polarized photons
  at high luminosity and forward angles            and a 4 hermetic detector
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 Consideration                  L. Cardman
• Spectrometer Options, Comments
  from the Mini-Review                 R. Holt
• Upgrade Physics in Hall A            K. de Jager
• Upgrade Physics in Hall C            R. Ent
• CLAS12: Options and Physics          V. Burkert
• GlueX: Options and Physics           E. Smith
             Points from the PAC27 Charge
             Relevant to Tomorrow’s Talks

• 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.
                                DOE Critical Decision-0 Approval




                   period CD-0 to CD-1 is referred to as project “definition phase”




DOE Order 413.3 Project Management Manual                          Phases         Planning Dates
  CD-0 Approve Mission Need                                           CDR             FY 04/05

  CD-1 Approve Preliminary Baseline Range                             R&D             FY 04-08

  CD-2 Approve Performance Baseline Range                             PED             FY 06-08

  CD-3 Approve Start of Construction                               Construction       FY 08-11

  CD-4 Approve Start of Operations                                  Operation         FY 11/12

				
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posted:10/14/2012
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