Overview/Future Program at JLab Jian-ping Chen ( ), Jefferson Lab, - - PowerPoint PPT Presentation
Overview/Future Program at JLab Jian-ping Chen ( ), Jefferson Lab, Virginia, USA Hadron-China2017, Nanjing University University, July 24-28, 2017 JLab and 12 GeV Energy Upgrade, Detector Upgrade (SoLID, ) JLab12 Science Program
Jian-ping Chen (陈剑平), Jefferson Lab, Virginia, USA Hadron-China2017, Nanjing University University, July 24-28, 2017
§ JLab12 Science Program Recent Highlights § Future - Electron Ion Collider
Cryogenics Medical Imaging Fundamental Forces & Symmetries
Theory & Computation Nuclear Astrophysics Nuclear Structure Accelerator S&T Structure of Hadrons
J.T. Friedman R. Taylor H.W. Kendall
Nobel Prize 1990
Robert Hofstadter,
Nobel Prize 1961
Quarks carry ∼ 1% ? of proton’s mass mq ~ 10 MeV mN ~ 1000 MeV How does glue dynamics generate the energy for nucleon mass? How does quark and gluon dynamics generate the rest of the proton spin? Quarks carry ∼ 30%
Probing momentum
Q (GeV)
200 MeV (1 fm) 2 GeV (1/10) fm) Color Confinement Asymptotic freedom Can we scan the nucleon to reveal its 3D structure? How does the glue bind quarks and itself into a proton and nuclei?
RECOMMENDATION II We recommend the timely development and deployment of a U.S.-led ton-scale neutrinoless double beta decay experiment. RECOMMENDATION III We recommend a high-energy high-luminosity polarized EIC as the highest priority for new facility construction following the completion of FRIB. Jefferson Lab EIC (JLEIC) development RECOMMENDATION IV We recommend increasing investment in small-scale and mid-scale projects and initiatives that enable forefront research at universities and laboratories. MOLLER, SoLID Operate 12 GeV CEBAF
§Enhanced capabilities in existing Halls §Increase of Luminosity 1035 - ~1039 cm-2s-1 New Hall CHL-2 20 cryomodules Add 5 cryomodules Add 5 cryomodules 20 cryomodules Add arc Project Scope (~99.7% complete):
TPC = $338M ETC < $2M Project Completion Sept 2017
Hall D – exploring origin of confinement by studying exotic mesons Hall B – understanding nucleon structure via generalized parton distributions Hall C – precision determination of valence quark properties in nucleons/nuclei Hall A – form factors, future new experiments (e.g., SoLID and MOLLER)
10
Solenoidal Large Intensity Device
excited gluon field
13
14
p at 11 GeV
May 2013 Page 16
– Confined motion in a nucleon (semi-inclusive DIS)
– Spatial imaging (exclusive DIS)
– High luminosity – Polarized beams and targets – Sophisticated detector systems
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x=0.1
Key of SoLID-Spin program: Large Acceptance + High Luminosity à 4-D mapping of asymmetries à Tensor charge, TMDs … àLattice QCD, QCD Dynamics, Quark Orbital Angular Momentum, Imaging in 3-D momentum space.
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−0.02 0.00 0.02 0.04 0.06
xf ⊥(1)
1T
(x, Q2) Q2 = 2.4 GeV2
World015 vs. World015 + SoLID
(stat. + syst. errors)
x 0.1 0.2 0.3 0.4 0.5 0.6 x 20 40 60 80
δf ⊥(1)world
1T
/δf ⊥(1)world+SoLID
1T
Sivers Asymmetries
PT vs. x for one (Q2, z) bin Total > 1400 data points
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Standard Model
(from PDG 2014)
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Excited Glue Hall D@JLab
Searching for the rules that govern hadron construction
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May 2013 Page 21
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Quark Energy Trace Anomaly Gluon Energy Quark Mass
*
J/ψ: ideal probe of non-perturbative gluon The high luminosity & large acceptance capability of SoLIDenables a unique “precision” measurement near threshold
Models relate J/ψ enhancement to trace anomaly
αβγ γ αβ
Track Momentum [GeV/c] 0.0 0.5 1.0 1.5 2.0 2.5 3.0 β from Time of Flight 0.0 0.2 0.4 0.6 0.8 1.0 1 10 102
Positively Charged Particles
p K π e
physics operations
papers at APS DNP Fall 2016 Meeting
2017
in Hall A in Spring 2017
Search
π0 ’s reconstructed in DVCS calorimeter
100 PAC days approved: Ø High impact experiment for nucleon 3D imaging program Ø High precision scaling tests of the DVCS cross section at constant xB Ø CEBAF12 will allow first time exploration of the high xB region
Excellent coincident time resolution: 250 MHz beam structure
Planned 50% of experiment completed in 2014-2016
Analysis path:
xB=0.36
π0
10 MeV resolution
May 2013 Page 26
The new GlueX results show:
pure vector coupling.
The first experimental results, from data collected in the GlueX engineering run, have been published in Phys. Rev. C.
GlueX will search for hybrid mesons, particles in which the strong gluonic field contributes directly to their properties. From the spectrum of these particles, we can learn about the gluonic field in QCD.
Σ
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May 2013 Page 27
statistical errors are ~0.4%
Systematic uncertainty
1 GeV data will extend to Q2~2x10-4 GeV2
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1 mm gap between Si tracker detectors for passage of electron beam
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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
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 Community White Paper arXiv:1212.1701v2 NSAC 2015 Long-Range Plan: We recommend a high-energy high-luminosity polarized EIC as the highest priority for new facility construction following the completion
JLab EIC Figure 8 Concept
consistent w/running 12 GeV CEBAF
Ø Fulfills White Paper Requirements
31
(FY17-18)
1035 1034 1033 (
LHC
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1212.1701.v3
Electron injector Polarized, 3GeV
Polarized, 12GeV, proton SRF Linac-ring Polarized H2+ source Siberian Snake And Spin rotator Electron ring Polarized, 3GeV
See W. L. Zhan’s talk@The 8th Workshop on Hadron Physics in China and Opportunities Worldwide (2016)
lIn HIAF I: EIC Ion pre-Booster 1014~15 ppp à Lower energy EIC (Update +ERL) Luminosity : ~1033 cm-2 s-1