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MEIC Detector and IR Integration. Vasiliy Morozov, Charles Hyde, Pawel Nadel-Turonski MEIC Detector and IR Design Mini-Workshop, October 31, 2011. MEIC Primary “Full-Acceptance” Detector. 7 m. (approximately to scale). detectors. solenoid. ion FFQs. ion dipole w/ detectors. ions. IP.

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Meic detector and ir integration

MEIC Detector and IR Integration

Vasiliy Morozov, Charles Hyde, Pawel Nadel-Turonski

MEIC Detector and IR Design Mini-Workshop, October 31, 2011


Meic primary full acceptance detector

MEIC Primary “Full-Acceptance” Detector

7 m

(approximately to scale)

detectors

solenoid

ion FFQs

ion dipole w/ detectors

ions

IP

0mrad

electrons

electron FFQs

50 mrad

2 m

Detect particles with angles below 0.5obeyond ion FFQs and in arcs.

2 m

2+3 m

Central detector

Detect particles with angles down to 0.5o before ion FFQs.

Need up to 2 Tm dipole in addition to central solenoid.

Central detector, more detection space in ion direction as particles have higher momenta

TOF

Make use of the (50 mr) crossing angle for ions!

Solenoid yoke + Muon Detector

Solenoid yoke + Hadronic Calorimeter

Cerenkov

RICH

Muon Detector

4-5 m

EM Calorimeter

Tracking

HTCC

Hadron Calorimeter

EM Calorimeter

Distance IP – electron FFQs = 3.5 m Distance IP – ion FFQs = 7.0 m (Driven by push to 0.5 detection before ion FFQs)

2 m

3 m

2 m

Pawel Nadel-Turonski & Rolf Ent


Interaction region ions

Interaction Region: Ions

Distance from the IP to the first FF quad = 7 m

Quad strengths of FF triplet at 100 GeV/c

Q1 = -64.1 T/m

Q2 = 64.5 T/m

Q3 = -17.0 T/m

±10 cm quad aperture allows clear line of sight at ±0.5

CCB next to FFB for chromatic correction

Chromaticity Compensation Block (CCB)

Beam Extension Section

Final Focusing Block (FFB)

7 m

βymax ~ 2700 m

βx* = 10 cm

βy* = 2 cm

Whole Interaction Region: 158 m


Tracking through ffb

Tracking Through FFB

  • Maximum excursion in X plane for positive particle

  • At lower p/p values, maximum x occurs in the 2nd quad; at higher p/p values, maximum x is in the 3rd quad

  • p/p is equivalent to (q/m), i.e. p after d break up behaves as p/p = -0.5


Maximum orbit excursion vs momentum offset

Maximum Orbit Excursion vs Momentum Offset

  • Quad aperture = Field at the pole tip / Maximum field gradient


G4beamline simulations

G4beamline Simulations

  • GEANT 4 toolkit for beam line simulations

  • Realistic simulations of complete system at later design stages

  • Not very well suited for optimization tasks

p/p = -0.5

p/p = 0.0

p/p = 0.5


Detector solenoid

Detector Solenoid

  • 4 T field at the center, 5 m long, 2.5 m inner radius, IP 2 m downstream from edge

  • Realistic solenoid model: many infinitely-thin current sheets evenly spread radially

  • Ion beam at IP is at 50 mrad to the solenoid axis

  • 60 GeV/c proton orbit distortion at the entrance into the spectrometer dipole 5 m downstream of IP assuming proton and electron orbits are in horizontal plane at IP

    • x = 250 mm, y = -8.9 mm, px/p = 0.050, py/p = -0.0024


Correcting orbit distortion

Correcting Orbit Distortion

  • Important to correct vertical offset and angle to make the orbit flat in the ring

  • Tricky because no space for corrector dipoles between IP and downstream FFB

  • Suggested solution:

    • Rotate the interaction plane by a certain angle around the solenoid axis

    • Rotate the spectrometer dipole around its axis by a certain angle

  • Other options

    • Let the ion orbit shift inside the FFB quads and correct it downstream

    • Install FFB quads at an angle to keep the distorted orbit centered

    • Make the spectrometer dipole a few independent dipoles used as correctors

    • Shift the IP

    • ??

    • Combination of some of the above options


Suggested solution

Suggested Solution

  • Was shown in simulations to correct the vertical orbit distortion for 60 GeV/c protons with 50 mrad crab crossing angle but should work in general

  • The spectrometer dipole is modeled as a 1 m long box with 2 T uniform vertical field

  • The rotation angles are first obtained analytically and then checked in simulation

  • The required rotation of the interaction plane around the solenoid axis is 36.8 mrad

    • Can be done by corrector dipoles in front of the solenoid where there is space

  • The required spectrometer dipole rotation around its axis is -57.7 mrad

    • Perhaps can be implemented without mechanical rotation by using additional coil windings in the dipole to rotate the field

    • Dipole axis lies in horizontal plane

    • For the dipole model used, the correction is not sensitive to the dipole axis alignment in horizontal plane

  • In the solenoid model used, the solenoidal fringe field extends into the dipole and was not taken into account when calculating the correction, therefore there is a small effect from the fringe field, field maps should be used for more accurate simulations


Corrected orbit

Corrected Orbit


Final focusing block

Final Focusing Block

  • Distance from the IP to the first quad = 7 m

  • Quadrupole lengths: L1 = L2 = L3 = 1.5 m

  • Quad strengths @ 100 GeV/c: Q1 = -64.1 T/m, Q2 = 64.5 T/m, Q3 = -17.0 T/m


Tracking through ffb1

Tracking through FFB


Ffb acceptance study

FFB Acceptance Study

  • 60 GeV/c proton beam originates at the interaction point

  • Beam particles uniformly distributed within a horizontal (vertical) angle of 1 around the beam trajectory and p/p of 0.7

  • Quad aperture radii = 10 cm  6 T / (field gradient @ 100 GeV/c)

  • Particles that pass through the FFB shown in blue


Optimized ffb

Optimized FFB

  • Distance from the IP to the first quad = 7 m

  • Quadrupole lengths: L1 = 1.2 m, L2 = 2.4 m, L3 = 1.2 m

  • Quad strengths @ 100 GeV/c: Q1 = -79.7 T/m, Q2 = 41.3 T/m, Q3 = -23.6 T/m

Pawel Nadel-Turonski & Alex Bogacz


Tracking through optimized ffb

Tracking through Optimized FFB

  • Each quad aperture = B max / (field gradient @ 100 GeV/c)


Optimized ffb acceptance

Optimized FFB Acceptance

  • 60 GeV/c protons, each quad aperture = B max / (field gradient @ 100 GeV/c)

9 T max

6 T max

12 T max


Ffb acceptance for neutrons

FFB Acceptance for Neutrons

  • Neutrons uniformly distributed within 1 horizontal & vertical angles around 60 GeV/c proton beam

  • Each quad aperture = B max / (field gradient @ 100 GeV/c)

9 T max

6 T max

12 T max


Complete system

Complete System

  • 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

  • FFB

  • Big spectrometer dipole

    • 4 m downstream of the FFB, sector bend, 3.5 m long, 60 mrad bending angle, 20 cm square aperture


System acceptance for neutrons

System Acceptance for Neutrons

  • Neutrons uniformly distributed within 1 horizontal & vertical angles around 60 GeV/c proton beam

  • Each quad aperture = 6 T / (field gradient @ 100 GeV/c)


System acceptance for p p 0 5

System Acceptance for p/p = -0.5

  • Protons with p/p = -0.5 uniformly distributed within 1 horizontal & vertical angles around the nominal 60 GeV/c proton beam trajectory

  • Each quad aperture = 6 T / (field gradient @ 100 GeV/c)


System acceptance for p p 0 0

System Acceptance for p/p = 0.0

  • Protons with p/p = 0.0 uniformly distributed within 1 horizontal & vertical angles around the nominal 60 GeV/c proton beam trajectory

  • Each quad aperture = 6 T / (field gradient @ 100 GeV/c)


System acceptance for p p 0 51

System Acceptance for p/p = +0.5

  • Protons with p/p = +0.5 uniformly distributed within 1 horizontal & vertical angles around the nominal 60 GeV/c proton beam trajectory

  • Each quad aperture = 6 T / (field gradient @ 100 GeV/c)


Transverse coordinates for p p 0 5

Transverse Coordinates for p/p = -0.5

  • 30 GeV/c protons, each quad aperture = 6 T / (field gradient @ 100 GeV/c)

  • Blue: within cone with polar angle < 0.25; green: 0.25 <  < 0.5;red:  > 0.5

At the entrance into the big dipole

At the exit from the big dipole


Transverse coordinates for p p 0 0

Transverse Coordinates for p/p = 0.0

  • 60 GeV/c protons, each quad aperture = 6 T / (field gradient @ 100 GeV/c)

  • Blue: within cone with polar angle < 0.25; green: 0.25 <  < 0.5;red:  > 0.5

At the entrance into the big dipole

At the exit from the big dipole


Transverse coordinates for p p 0 51

Transverse Coordinates for p/p = +0.5

  • 90 GeV/c protons, each quad aperture = 6 T / (field gradient @ 100 GeV/c)

  • Blue: within cone with polar angle < 0.25; green: 0.25 <  < 0.5;red:  > 0.5

At the entrance into the big dipole

At the exit from the big dipole


Separation of electron and ion beams

Separation of Electron and Ion Beams


Beam parallel after ffb

Beam Parallel after FFB

  • FFB: quad lengths = 1.2, 2.4, 1.2 m, quad strengths @ 100 GeV/c = -79.6, 41.1, -23.1 T/m

  • 1.2 Tm (@ 60 GeV/c) outward-bending dipole in front of the final focus

  • 12 Tm (@ 60 GeV/c) inward-bending dipole 4 m downstream of the final focus


Momentum angle resolution

Momentum & Angle Resolution

  • Beam parallel after the final focus

  • Protons with p/p spread launched at different angles to nominal 60 GeV/c trajectory

  • Red hashed band indicates 10 beam stay-clear


Momentum angle resolution1

Momentum & Angle Resolution

  • Beam parallel after the final focus

  • Protons with p/p spread launched at different angles to nominal 60 GeV/c trajectory

  • Red hashed band indicates 10 beam stay-clear

|p/p| > 0.03 @ x,y = 0


Momentum angle resolution2

Momentum & Angle Resolution

  • Beam parallel after the final focus

  • Protons with different p/p launched with x spread around nominal 60 GeV/c trajectory

  • Red hashed band indicates 10 beam stay-clear


Momentum angle resolution3

Momentum & Angle Resolution

  • Beam parallel after the final focus

  • Protons with different p/p launched with x spread around nominal 60 GeV/c trajectory

  • Red hashed band indicates 10 beam stay-clear

|x| > 2 mrad @ p/p = 0


Beam focused after ffb

Beam Focused after FFB

  • FFB: quad lengths = 1.2, 2.4, 1.2 m, quad strengths @ 100 GeV/c = -89.0, 51.1, -35.7 T/m

  • 1.2 Tm (@ 60 GeV/c) outward-bending dipole in front of the final focus

  • 12 Tm (@ 60 GeV/c) inward-bending dipole 4 m downstream of the final focus

Pawel Nadel-Turonski & Charles Hyde


Momentum angle resolution4

Momentum & Angle Resolution

  • Beam focused after the FFB

  • Protons with p/p spread launched at different angles to nominal 60 GeV/c trajectory

  • Red hashed band indicates 10 beam stay-clear


Momentum angle resolution5

Momentum & Angle Resolution

  • Beam focused after the FFB

  • Protons with p/p spread launched at different angles to nominal 60 GeV/c trajectory

  • Red hashed band indicates 10 beam stay-clear

|p/p| > 0.005 @ x,y = 0


Momentum angle resolution6

Momentum & Angle Resolution

  • Beam parallel after the final focus

  • Protons with different p/p launched with x spread around nominal 60 GeV/c trajectory

  • Red hashed band indicates 10 beam stay-clear


Momentum angle resolution7

Momentum & Angle Resolution

  • Beam parallel after the final focus

  • Protons with different p/p launched with x spread around nominal 60 GeV/c trajectory

  • Red hashed band indicates 10 beam stay-clear

|x| > N/A @ p/p = 0

|x| > 3 mrad @ p/p = 0


Future plans

Future Plans

Design optimization, e.g. acceptance of the FFB using genetic algorithm

Integration into the ring optics, such as decoupling, dispersion compensation, understanding effect of large-aperture quadrupoles on the optics, etc.

Hybrid permanent / electro magnet electron FFB design? (Pawel Nadel-Turonski & Alex Bogacz)

Evaluation of the engineering aspects, such as magnet parameters, electron and ion beam line separation, etc.


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