Max. Central Momentum 11 GeV/c 9 GeV/c Min. Scattering Angle 5.5 deg 10 deg Momentum Resolution.15% -.2% Solid Angle 2.1 msr 4.
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1 Hall C - 12 GeV pcdr Max. Central Momentum 11 GeV/c 9 GeV/c Min. Scattering Angle 5.5 deg 10 deg Momentum Resolution.15% -.2% Solid Angle 2.1 msr 4.4 msr Momentum Acceptance 40% Target Length Acceptance 50 cm Opening Angle with HMS 16 deg 25 deg Configuration QQ(DQ) Bend Angle 18.4 deg
2 Hall C at 12 GeV: HMS + SHMS Charged particle detection with momentum up to beam energy z = E h /ν = 1 Small angle capability essential to measure charged particle along momentum transfer θ h // q ± few o Precision L/T separations σ = Γ(σ Τ + εσ L + ε cos(2φ)σ TT + [ε(ε+1)/2] 1/2 cos(φ)σ LT ) General Infrastructure for Dedicated Experiments Exclusive and Semi-Exclusive Reactions (z > 0.3) at high Q 2 Separation of Polarized and Unpolarized Structure Functions over large range of x and Q 2
3 Hall C at 12 GeV: SHMS Carriage and Shield House 16 SHMS-HMS angle. Hard connections to pivot yield 0.01 scattering angle, 0.5mm pointing reproducibility. 1m shielding typ. SOS
4 Hall C at 12 GeV: Co-Existence of SHMS with HMS HMS: QQQD SHMS: QQ(QD)
5 Hall C at 12 GeV: HMS Option: replace Cherenkov with FPP
6 Hall C at 12 GeV: HMS Performance
7 Hall C at 12 GeV: HMS Performance Parameter HMS Performance Range of Central Momentum 0.4 to 7.3 GeV/c Momentum Acceptance ±10% Momentum Resolution 0.1% % Scattering Angle Range 10.5 to 90 degrees Maximum Target Length at 90 degrees 10 cm Horizontal Angle Acceptance ±32 mrad Vertical Angle Acceptance ±85 mrad Solid Angle Acceptance 8.1 msr Horizontal Angle Resolution 0.8 mrad Vertical Angle Resolution 1.0 mrad Vertex Reconstruction Resolution 0.3 cm Maximum Flux within Acceptance ~5 MHz Electron-hadron discrimination 1000:1 at 98% efficiency Pion-kaon discrimination 100:1 at 95% efficiency
8 Hall C at 12 GeV: SHMS Quads - Based on Existing HMS-Q1 Slightly increased gradient (8.6 T/m) compared to HMS-Q1 TOSCA (JLab) and external feasibility study show there are no issues Design and Tooling still available at company affordable
9 Hall C at 12 GeV: SHMS Combined Function Magnet Quadrupole inside Dipole to reduce current density TOSCA (JLab) and external feasibility study cryostability coil, conductor conservative force containment will require careful engineering, but no excessive forces energy quench within allowable margins Can be built without prototyping or R&D
10 Hall C at 12 GeV: SHMS Specifications Parameter Range of Central Momentum SHMS Specifications 2 to 11 GeV/c Momentum Acceptance -15% to +25% Momentum Resolution < 0.2% Scattering Angle Range Maximum Target Length at 90 degrees Horizontal Angle Acceptance Vertical Angle Acceptance Solid Angle Acceptance Horizontal Angle Resolution (yptar) Vertical Angle Resolution (xptar) Target Resolution (ytar) Maximum Flux within Acceptance Minimum Acceptable e/h discrimination Minimum Acceptable π/k discrimination 5.5 to 25 degrees 50 cm ±18 mrad ±50 mrad 4 msr (LSA tune) 2 msr (SSA tune) 2-4 mrad 1-2 mrad cm ~5 MHz 1000:1 at 98% efficiency 100:1 at 95% efficiency
11 Hall C at 12 GeV: SHMS Small-Solid-Angle Tune Model GeV/c =+10% =-10% 2.32 m To LSA Tune. Eff. Sol. Angle ~ 2 msr
12 Hall C at 12 GeV: SHMS Large-Solid-Angle Tune Model GeV/c =+10% =-10% 2.32 m To LSA Tune. Eff. Sol. Angle ~ 4 msr
13 Hall C at 12 GeV: SHMS Acceptance Point Target LSA Tune SSA Tune
14 Hall C at 12 GeV: SHMS Acceptance 50cm Target (viewed at 90 o ) LSA Tune SSA Tune
15 Hall C at 12 GeV: Detectors Small Solid Angle Tune Resolutions
16 Hall C at 12 GeV: Detectors: Detector Package in the Shield House
17 Hall C at 12 GeV: Detectors SHMS Detector Requirements Characteristic Requirement Tracking Resolution (each of two points) 100 µm DC < ~ 1% X 0 Multiple Scattering Nothing upstream of DC at low momentum. Size Particle Identification Minimum material upstream of Cerenkovs From 85x110 cm 2 at DC To 115x150 cm 2 at LGC Combination of Techniques to cover this wide momentum range.
18 AGC DC1 DC2 S1X S1Y HGC A1 TRD S2X S2Y LGC Argon/Neon Cerenkov C 4 F 10 Cerenkov DC1 Elevation S1X S1Y DC2 HGC A1 TRD S2X S2Y LGC AGC Argon/Neon Cerenkov C 4 F 10 Cerenkov Plan
19 Hall C at 12 GeV: Detectors: Size Summary SHMS Detector Active Areas (cm) Will design detectors assuming 50-cm target Will instrument assuming 30-cm target (both as viewed at 90 o )
20
21 Hall C at 12 GeV: Detectors Wire Chambers - Stack-up Design
22 Hall C at 12 GeV: Detectors Wire Chambers - SOS Resolution
23 Hall C at 12 GeV: Detectors: Particle Identification SHMS will use a COMBINATION of PID techniques to cover the entire momentum range of interest. Electron/Hadron Separation: Time-of-Flight at low momentum. Shower counter over full range. e - always trigger Cerenkov counters. Additional upstream Cerenkov at high energy
24 Hall C at 12 GeV: Detectors: Particle Identification 1 to 3 GeV/c Pion/Kaon Aerogel Cerenkov Kaon/Proton TOF & Aerogel 3 to 5.5 GeV/c Pion/Kaon C 4 F 10 Cerenkov Kaon/Proton Aerogel 5.5 to 11 GeV/c Pion/Kaon Atm. Press. Cerenkov, C 4 F 10 Cerenkov and de/dx Kaon/Proton C 4 F 10 at > 1 atm.
25 Hall C at 12 GeV: Detectors: Atmospheric Pressure Cerenkov 2.5 m long Ne (n-1= 67 x 10-6 ) and/or Ar (n-1 = 283 x 10-6 ) Atmospheric pressure - thin windows. Use only above 6 GeV (e.g., e/π separation for x > 1 experiment) Improves e/π (argon) or π/k (neon). Argon Neon Expect ~10 p.e.
26 Hall C at 12 GeV: Detectors: Particle Identification Summary
27 Hall C at 12 GeV: Detectors: Focal Plane Polarimeter The FPP being built for the HMS can also fit in the SHMS. DC1 S1X S1Y DC2 S2X S2Y LGC LGC AGC Argon/Neon Cerenkov FPP FPP
28 Pion Form Factor Essential: 9 GeV/c (at Q 2 = 6 GeV 2 ) 5.5 degrees (with HMS at 10.5 degrees!) precise L/T (smooth acceptances)
29 (Semi-)Exclusive Meson Production x B = Months, Hall C σ L σ T dσ L,T /dt (µb/gev 2 ) /Q 6 1/Q 4 1/Q Q 2 (GeV 2 ) Can access deep exclusive charged π/k electroproduction to Q 2 ~ 10 Large range in z ( ), x ( ), Q 2 (3-10 GeV 2 ), and p T in semi-exclusive meson electroproduction for duality and factorization studies and, if applicable, spin/flavor parton distributions
30 Proton-Delta Transition Can access magnetic transition form factor up to Q 2 = 18 GeV 2 (typ. Q 2 ~ 15 GeV 2 ) Assumption: E2/M1 remains small. If not higher Q 2 may be possible
31 Crossing Charm Threshold s 7 ds/dt(10 7 GeV 14 nb/gev 2 ) γ p π + n with Θ cm at 90 o World data around 90 o E94104 Preliminary(2002) E02010 Projected JLab 11 GeV Projected 3 4 s 7 ds/dt(10 7 GeV 14 nb/gev 2 ) γ n π - p with Θ cm at 90 o World Data E94104 Preliminary(2002) E02010 Projected JLab 11 GeV Projected s 1/2 (GeV) s 1/2 (GeV) Small Cross Sections require high luminosity hall Requires detection of two charged particles with ~6.5 GeV/c momentum γp π o p also possible using BigCal (under construction)
32 Separated Structure Functions ε > 0.3 H,D(e,e ) x = 0.8 σ+ R F 1 and F 2 (F 1 and F L ) + A // + A_ g 1 and g 2 + x > 1 in Nucleus
33 Structure Function Moments 10-1 M n (Q 2 ) = 0 1 dx x n-2 F 2 (x,q 2 ) Lattice QCD F 2 p n Q 2 = 4 GeV 2 2 =4 = 0.56) n = 2, 4 M n Q 2 (GeV/c) 2 Experiment F 2 2p d (or CTEQ/MRST/GRVS) Lack of large x (resonances and elastic!) + Structure Functions + Duality Studies + Q 2 Evolution Studies
34 DIS-Parity sin 2 θ W Weak Mixing Angle Scale dependence in MS-bar scheme Jens Erler SM NuTeV QWeak E 158 DIS-Parity APV MSSM Z-pole Requirements: spectrometers at 12.5 degrees (HMS + SHMS = 12 msr) ~2 kw cryogenic cooling (QWeak wants 2.2 kw, ~ 90 µa and 60 cm LD2) 1% Polarimetry (Qweak wants 1.4%) Q [GeV] Utilizes Hall C infrastructure
35 Color Transparency AGS A(p,2p) Transparency T C(e,e p) - Bates SLAC JLab 95/96 JLab 99 - Q 2 (GeV/c) JLab 12 GeV Glauber Glauber + CT (I) Glauber + CT (II) Glauber + CT (III) Proton Momentum GeV/c Cross Section Ratio D(e,e p) JLAB 12 GeV No CT CT (I) CT (II) Transparency Cu(e,e π) JLab 6 GeV Glauber + CT (I) JLab 12 GeV Q 2 (GeV 2 ) A(e,e p) requires Q 2 > 12 GeV Q 2 (GeV/c) 2 A(e,e π) can reach Q 2 = 14 GeV 2 at larger t
36 Hall C at 12 GeV: HMS + SHMS Charged particle detection with momentum up to beam energy z = E h /ν = 1 Small angle capability essential to measure charged particle along momentum transfer θ h // q ± few o Precision L/T separations σ = Γ(σ Τ + εσ L + ε cos(2φ)σ TT + [ε(ε+1)/2] 1/2 cos(φ)σ LT ) General Infrastructure for Dedicated Experiments Exclusive and Semi-Exclusive Reactions (z > 0.3) at high Q 2 Separation of Polarized and Unpolarized Structure Functions over large range of x and Q 2
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