Interaction Region Design and Detector Integration V.S. Morozov for EIC Study Group at JLAB 2 nd Mini-Workshop on MEIC Interaction Region Design JLab, November 2, 2012

V.S. Morozov 11/02/2012 Outline G4beamline/GEANT4 Model Ion and Electron Detector Region  Optics  Magnet Parameters  Acceptance, Momentum and Angle Resolution Current status of the design optimization High-luminosity interaction region Outlook and R&D

V.S. Morozov 11/02/2012 MEIC Full-Acceptance Detector

V.S. Morozov 11/02/2012 Detector’s 3D Model

V.S. Morozov 11/02/2012 Detector Region Magnets

V.S. Morozov 11/02/2012 GEANT4 Model Detector solenoid –4 T field at the center, 5 m long, 2.5 m inner radius, IP 2 m downstream from edge Small spectrometer dipole in front of the FFB –2 T 100 GeV/c), 1 m long, hard-edge uniform field –Interaction plane and dipole are rotated around z to compensate orbit offset FFB Big spectrometer dipole –4 m downstream of the FFB, sector bend, 3.5 m long, 60 mrad bending angle (21 Tm, GeV/c),  40 cm square aperture

V.S. Morozov 11/02/2012 Ion Detector Region Optics Downstream FFB: quad lengths = 1.2, 2.4, 1.2 m, quad 100 GeV/c = -89.0, 51.1, T/m 2 T 100 GeV/c) outward-bending dipole in front of the final focus 6 T 100 GeV/c) inward-bending dipole 4 m downstream of the final focus Ion beam IP x 4.4 m 7 m

V.S. Morozov 11/02/2012 Ion Magnet Parameters 50 mrad beam crossing angle NameTypeMax B (T) Max  B y /  x (T/m) Length (m) Inner radius (cm) Outer radius (cm) Distance from IP* (m) Beam separation** (cm) Notes Detector solenoidSC4N/A5250 Downstream ion side Ion spectrometer dipole 1 SC2N/A120525~60 mrad field rotation Septum? Downstream ion quad 1SC h/v orbit corrector? Downstream ion quad 2SC h/v orbit corrector? Downstream ion quad 3SC h/v orbit corrector? Ion spectrometer dipole 2 SC6N/A rectangular or sector? Upstream ion side Upstream ion quad 1SC h/v orbit corrector? Upstream ion quad 2SC h/v orbit corrector? Upstream ion quad 3SC h/v orbit corrector? * The distance is from the IP to the magnet side facing the IP ** The electron and ion beam separation is at the magnet side facing the IP Limited on e beam side by beam separation

V.S. Morozov 11/02/2012 Downstream Ion FFB Acceptance for Protons Quad apertures = B max / (field 100 GeV/c) 6 T max 9 T max 12 T max  electron beam

V.S. Morozov 11/02/2012 Downstream Ion FFB Acceptance for Protons Uniform spreads:  0.7 in  p/p and  1  in horizontal/vertical angle Apertures: Quads = 9, 9, 7 T / (  B y /  100 GeV/c)  electron beam

V.S. Morozov 11/02/2012 Downstream Ion FFB Acceptance for Neutrons 6 T max 9 T max 12 T max Neutrons uniformly distributed within  1  horizontal & vertical angles around proton beam Each quad aperture = B max / (field 100 GeV/c)  electron beam

V.S. Morozov 11/02/2012 Acceptance of Downstream Ion Final Focus Uniform distribution horizontally & vertically within  1  around protons Apertures: Quads = 9, 9, 7 T / (  B y /  100 GeV/c), Big Dipole = -30/+50  40 cm  electron beam  p/p = -0.5  p/p = 0  p/p = 0.5 neutrons

V.S. Morozov 11/02/2012 Forward Ion Momentum & Angle Resolution Protons with  p/p spread launched at different angles to nominal trajectory  electron beam ±10 60 GeV/c |  p/p| >  x,y = 0

V.S. Morozov 11/02/2012 Forward Ion Momentum & Angle Resolution Protons with different  p/p launched with  x spread around nominal trajectory |  x | > 3  p/p = 0  electron beam  electron beam ±10 60 GeV/c

V.S. Morozov 11/02/2012 Electron Detector Region Optics Similar to ion detector design Detector solenoid is not included Still need to address: –Transverse coupling –Effect on the polarization Electron beam IP x 4 m 3 m

V.S. Morozov 11/02/2012 Electron Magnet Parameters 50 mrad beam crossing angle NameTypeMax B (T) Max  B y /  x (T/m) Length (m) Inner radius (cm) Outer radius (cm) Distance from IP* (m) Beam separation** (cm) Notes Downstream electron side Downstream electron quad 1SC Downstream electron quad 2SC Downstream electron quad 3SC Electron spectrometer dipole 1warm1.2N/A Electron spectrometer dipole 2warm1.2N/A Merge dipoles 1 & 2? Upstream electron side Upstream electron quad 1permanent Upstream electron quad 2permanent Upstream electron quad 3SC Upstream electron quad 4SC Upstream electron quad 5SC * The distance is from the IP to the magnet side facing the IP ** The electron and ion beam separation is at the magnet side facing the IP Limited on ion beam side by beam separation

V.S. Morozov 11/02/2012 Acceptance of Downstream Electron Final Focus 5 GeV/c e -, uniform spreads: -0.5/0 in  p/p and  25 mrad in horizontal/vertical angle Apertures: Quads = 6, 6, 3 T / (  B y /  11 GeV/c), Dipoles =  20  20 cm ion beam 

V.S. Morozov 11/02/2012 Acceptance of Downstream Electron Final Focus Uniform e - distribution horizontally & vertically within  25 mrad around 5 GeV/c beam Apertures: Quads = 6, 6, 3 T / (  B y /  11 GeV/c), Dipoles =  20  20 cm  p/p = -0.5  p/p =  p/p = -0.1  p/p = 0 ion beam  ion beam 

V.S. Morozov 11/02/2012 Forward Electron Momentum & Angle Resolution Electrons with  p/p spread launched at different angles to nominal 5 GeV/c trajectory |  p/p| >  x,y = 0 ion beam 

V.S. Morozov 11/02/2012 Forward Electron Momentum & Angle Resolution Electrons with different  p/p launched with  x spread around nominal 5 GeV/c trajectory |  x | >  p/p = 0 ion beam 

V.S. Morozov 11/02/2012 Detector Region Model

V.S. Morozov 11/02/2012 Downstream Electron / Upstream Ion Side L = 40 cm, IR = 9.2 cm, 64.9 T/m max, 6 T max L = 60 cm, IR = 14.4 cm, 41.6 T/m max, 6 T max L = 30 cm, IR = 19.7 cm, 7.6 T/m max, 1.5 T max L = 1.2 m, IR = 3 cm, T/m max, 3.7 T max L = 1.5 m, IR = 4 cm, T/m max, 4.5 T max L = 0.5 m, IR = 4 cm, T/m max, 4.7 T max 9.8 cm 6.6 cm 9.6 cm 10 x 5.3 cm 10 x 6.8 cm

V.S. Morozov 11/02/2012 Electron Detector Region Optics Electron beam

V.S. Morozov 11/02/2012 Ion Detector Region Optics Ion beam

V.S. Morozov 11/02/2012 Ion Magnet Parameters 50 mrad beam crossing angle NameTypeMax B (T) Max  B y /  x (T/m) Length (m) Inner radius (cm) Outer radius (cm) Distance from IP* (m) Beam separation** (cm) Notes Detector solenoidSC4N/A5250 Downstream ion side Ion spectrometer dipole 1SC2N/A120525~60 mrad field rotation Septum? Downstream ion quad 1SC h/v orbit corrector? Downstream ion quad 2SC h/v orbit corrector? Downstream ion quad 3SC h/v orbit corrector? Ion spectrometer dipole 2SC5N/A rectangular or sector? Upstream ion side Upstream ion quad 1SC h/v orbit corrector? Upstream ion quad 2SC x arc FODO dipole? Upstream ion quad 3SC arc FODO dipole? * The distance is from the IP to the magnet side facing the IP ** The electron and ion beam separation is at the magnet side facing the IP Limited on e beam side by beam separation

V.S. Morozov 11/02/2012 Electron Magnet Parameters 50 mrad beam crossing angle NameTypeMax B (T) Max  B y /  x (T/m) Length (m) Inner radius (cm) Outer radius (cm) Distance from IP* (m) Beam separation** (cm) Notes Downstream electron side Downstream electron quad 1SC Downstream electron quad 2SC Downstream electron quad 3SC Electron spectrometer dipole 1warm1.2N/A Electron spectrometer dipole 2warm1.2N/A Merge dipoles 1 & 2? Upstream electron side Upstream electron quad 1permanent Upstream electron quad 2permanent Upstream electron quad 3SC Upstream electron quad 4SC Upstream electron quad 5SC * The distance is from the IP to the magnet side facing the IP ** The electron and ion beam separation is at the magnet side facing the IP Limited on ion beam side by beam separation

V.S. Morozov 11/02/2012 High-Luminosity Detector Region Optics Smaller detector space Assume the same chromatic contribution as the full-acceptance IR  * x/y reduced to 7.5/1.5 cm  ~33% luminosity increase  Theoretical luminosity increase naively (4.4+7)/( )  1.43 but since focal distance is longer than the detector space (5.4+8)/( )  m 4.5 m IP x

V.S. Morozov 11/02/2012 Outlook and R&D