r. d. mckeown jefferson lab college of william and mary the jlab 12 gev upgrade 1 r. mckeown - iupap...
TRANSCRIPT
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R. D. McKeownJefferson Lab
College of William and Mary
The Jlab 12 GeV Upgrade
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12 GeV Science Program
• The physical origins of quark confinement (GlueX, meson and baryon spectroscopy)
• The spin and flavor structure of the proton and neutron (PDF’s, GPD’s, TMD’s…)
• The quark structure of nuclei
• Probe potential new physics through high precision tests of the Standard Model
• Defining the Science Program:
– Four Reviews: Program Advisory Committees (PAC) 30, 32, 34, 35
– 2006 through 2010
– Results: 32 experiments approved ; 13 conditionally approved
– PAC36 scheduled August 2010: continue rankings
Exciting slate of experiments for 4 Halls planned for initial five years of operation!
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12 GeV Upgrade Project
Upgrade is designed to build on existing facility: vast majority of accelerator and experimental equipment have continued use New Hall
Add arc
Enhanced capabilitiesin existing Halls
Add 5 cryomodules
Add 5 cryomodules
20 cryomodules
20 cryomodules
Scope of the project includes: •Doubling the accelerator beam energy•New experimental Hall and beamline•Upgrades to existing Experimental Halls
Maintain capability to deliver lower pass beam energies:
2.2, 4.4, 6.6….
Upgrade arc magnets and supplies
CHL upgrade
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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 and nuclei
Hall A – short range correlations, form factors, hyper-nuclear physics, future new experiments (e.g. PV and
Moller)
12 GeV Scientific Capabilities
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Hall A
GEMs
Super Bigbite project:
➙ large dipole magnet ➙ GEM trackers (~100,000
channels)➙ hadron and EM calorimeter➙ Trigger and DAQ
operating in open geometry at a luminosity of 1038 cm-2s-1
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Hall A (Additional Equipment Required)
meters
met
ers
first toroid hybrid
toroid
PV Moller Scattering:• Precision test of SM• Custom Toroidal Spectrometer• 5kw LH Target
SOLID:• High Luminosity on LD2 and LH2 • Better than 1% errors for small bins• Large Q2 coverage• x-range 0.25-0.75• W2> 4 GeV2
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Hall B
HTCC
CTOF
Silicon Tracker
PCAL
FTOF
Drift ChambersR1, R2, R3
CLAS12
Solenoid &Toroid
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CLAS12 International Collaboration
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UK Edinburgh Univ Software
UK Glasgow Univ Central Detector, DAQ, Tagger….
France Grenoble Univ Central Detector
France Orsay – IN2P3 Central neutron Detector
France CEA Saclay Central Tracker, Reconstruction Software
Italy Bari Tbd, interest in RICH
Italy Catania Tbd
Italy Frascati & Fermi Ctr Central neutron Detector, interest in RICH
Italy Genoa Central neutron Detector, interest in Tagger
Italy ISS/Rome Tbd, interest in RICH
Italy Rome Tor Vergata Central neutron Detector, HD target
Russia ITEP Magnets, Simulations
Russia Moscow State HEP & SINP Silicon Tracker, Software
Korea Kyungpook Nat’l Univ CD TOF
Armenia Yerevan Physics Institute Calorimetry
COUNTRY INSTITUTION FOCUS
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Hall C• New Super High Momentum Spectrometer (SHMS)
Horiz. Bender, 3 Quads + DipoleP →11 GeV/cdP/P 0.5 –1.0x10-3
Acceptance: 5msr, 30%5.5°< θ< 40°
• High Momentum Spectrometer (HMS)
P →7.5 GeV/cDP/P = 0.5 –1.0x10-3
Acceptance: 6.5msr, 18%10.5°< θ< 90°
• Minimum opening angle: 17°
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Hall D
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Quantum Numbers of Hybrid MesonsQuarks
Excited Flux Tube Hybrid Meson
S 0
L 0
J PC 0
J PC 1
1
J PC
1
1
, Klike
J PC 0 1 2
0 1 2
S 1
L 0
J PC 1
J PC 1
1
like ,
Exotic
Flux tube excitation (and parallel quark spins) lead to exotic JPC
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Mass Predictions
Lowest mass expected to be p1(1−+) at 1.9±0.2 GeV
Lattice1-+ 1.9 GeV2+- 2.1 GeV0+- 2.3 GeV
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Wpu(x,k
T,r ) Wigner distributions
d2kT
PDFs f1
u(x), .. h1u(x)
GPDs/IPDs
d2kT drzd3r
TMD PDFs f1
u(x,kT), .. h1u(x,kT)
3D imaging
6D Dist.
d2rT
Form FactorsGE(Q2), GM(Q2)
dx &Fourier Transformation
1D
Unified View of Nucleon Structure
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H1, ZEUS
JLab Upgrade
11 GeV
H1, ZEUS
JLab @ 12 G
eV11 G
eV27 G
eV
200
GeV
W =
2 GeV
Study of high xB domain requires high luminosity
0.7
HERMES
COMPASS
The 12 GeV Upgrade is well matched to studies in the valence quark regime.
Kinematics Coverage of the 12 GeV Upgrade
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Extraction of GPD’s
t
hard vertices
A =Ds2s
s+-s-
s++s- =
Unpolarized beam, transverse target:
DsUT~ sinf{k(F2H – F1E)}dfE( ,x t)
DsLU~ sinf{F1H+ ξ(F1+F2)H+kF2E}df~
Polarized beam, unpolarized target:
H(x,t)
ξ=xB/(2-xB)
Unpolarized beam, longitudinal target:
DsUL~ sinf{F1H+ξ(F1+F2)(H+ξ/(1+ξ)E)}df~ H(x,t)
~
Cleanest process: Deeply Virtual Compton Scattering
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Quark Angular Momentum
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→ Access to quark orbital angularmomentum
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DVCS beam asymmetry at 12 GeV CLAS12
ep epg
High luminosity and large acceptance allows wide coverage in Q2 < 8 GeV2, xB< 0.65, andt< 1.5GeV2
Experimental DVCS program E12-06-119 was approved for the 12 GeV upgrade using polarized beam and polarized targets.
sinφ moment of ALU
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DVCS at 12 GeV CLAS12
u quarks
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SIDIS Electroproduction of Pions
• Separate Sivers and Collins effects
• Sivers angle, effect in distribution function:– (fh-fs) = angle of hadron relative to initial quark spin
• Collins angle, effect in fragmentation function: – (fh+fs) = p+(fh-fs’) = angle of hadron relative to final quark spin
e-e’ planeq
Scattering Plane
target angle
hadron angle
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A Solenoid Spectrometer for SIDIS
SIDIS SSAs depend on 4 variables (x, Q2, z and PT ) Large angular coverage and precision measurement of asymmetries in 4-D phase space are essential.
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Hall A Transversity Projected Data• Total 1400 bins in x, Q2, PT and z for 11/8.8 GeV beam.
• z ranges from 0.3 ~ 0.7, only one z and Q2 bin of 11/8.8 GeV is shown here. π+ projections are shown, similar to the π- .
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High x spin dependent DIS
REQUIRES:• High beam polarization• High electron current• High target polarization• Large solid angle
spectrometers22
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GEn – Hall C @ 12 GeV
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Future PV Program
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12 GeV Upgrade Schedule
• Two short parasitic installation periods in FY10• 6-month installation May-Oct 2011• 12-month installation May 2012-May 2013• Hall A commissioning start October 2013• Hall D commissioning start April 2014• Halls B and C commissioning start October 2014• Project Completion June 2015
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12 GeV Construction
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Physics Equipment Construction
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Physics Equipment Construction
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Walls - June 2010
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Jlab 12 GeV UpgradeAn exciting scientific opportunity Explore the physical origins of quark confinement (GlueX) New access to the spin and flavor structure of the proton and neutron Reveal the quark/gluon structure of nuclei Probe potential new physics through high precision tests of the Standard Model
Strong User community involvement NSF MRI and NSERC funding to universities for detector elements Strong international collaborations 32 PAC-approved experiments
Accel-Civil-Physics scope leverages the existing facility
Construction is well underway ! Accelerator nearing completion on major procurements; hardware arriving Detector assembly ramping up Civil construction on track
New Proposals and collaborations are welcome
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