Results of H4 VLE Simulations 03.11.2017, Marcel Rosenthal, Nikolaos - - PowerPoint PPT Presentation

Results of H4 VLE Simulations

03.11.2017, Marcel Rosenthal, Nikolaos Charitonidis, Yannis Karyotakis, Yiota Chatzidaki

Outline

• New optics (High Transmission,

see Meeting 23.10.17, https://indico.fnal.gov/event/15578/)

• Definition of “GoodParticles”
• Particle rates for 80 GeV/c secondaries
• Particle rates for -80 GeV/c secondaries
• Background Studies:
• Beam in H2
• Beam in H4

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“GoodParticle” Definition

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Schematic overview H4-VLE

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Four explored Options

• Option 1: same particle hits each detector
• Detectors: TOF1, TRIG1, TRIG2
• Detectors: TOF1, TRIG1, TRIG2, BPROFs, COLL1, NP02front
• Option 2: at least one 𝜌, 𝐿, 𝜈, 𝑓, 𝑞 hit in each detector
• Detectors: TOF1, TRIG1, TRIG2
• Detectors: TOF1, TRIG1, TRIG2, BPROFs, COLL1, NP02front

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(𝑱) (𝑱𝑱) (𝑱𝑱𝑱) (𝑱𝑾)

• nly counted

in option 2 counted in option 1 & 2

Composition 80 GeV/c → 7 GeV/c

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(𝑱)

𝝆 𝑳 𝒒 𝝂 𝒇

(𝑱𝑱) (𝑱𝑱𝑱) (𝑱𝑾)

scored @ TRIG2

Momentum Spectra @ TRIG2

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(𝑱) (𝑱𝑱𝑱)

Momentum of all “GoodParticles” for different options

Timing not considered

Four explored Options

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(𝑱) (𝑱𝑱) (𝑱𝑱𝑱) (𝑱𝑾)

• Option 1: particle hits each detector
• Detectors: TOF1, TRIG1, TRIG2
• Detectors: TOF1, TRIG1, TRIG2, BPROFs, COLL1, NP02front
• Option 2: at least one 𝜌, 𝐿, 𝜈, 𝑓, 𝑞 hit in each detector
• Detectors: TOF1, TRIG1, TRIG2
• Detectors: TOF1, TRIG1, TRIG2, BPROFs, COLL1, NP02front

Following results obtained with selection scheme 3 (but no consideration of timing yet)

Rates for 80 GeV/c

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Pion Rate

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rate ± stat. error (fraction of GoodParticles)

Physics list: FTFP_BERT

• Kin. energy cut: 10 MeV

Scored at TRIG2 Selection scheme III Normalized to 106 in 4.8s

W-target Cu-target Cu-target

Total Rate

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11 Physics list: FTFP_BERT

• Kin. energy cut: 10 MeV

Scored at TRIG2 Selection scheme III Normalized to 106 in 4.8s

𝒒 𝒇 𝝂 𝑳 𝝆 W-target Cu-target Cu-target

Rates for -80 GeV/c

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Pion Rate

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13 Physics list: FTFP_BERT

• Kin. energy cut: 10 MeV

Scored at TRIG2 Selection scheme III Normalized to 106 in 4.8s

rate ± stat. error (fraction of GoodParticles)

W-target Cu-target Cu-target

Total Rate

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14 Physics list: FTFP_BERT

• Kin. energy cut: 10 MeV

Scored at TRIG2 Selection scheme III Normalized to 106 in 4.8s

𝒒 𝒇 𝝂 𝑳 𝝆 W-target Cu-target Cu-target

Background Studies

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Full model: H4-beam on

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16 Particles scored in NP04 Fieldcage volume when H4 beam is on Detector materials currently vacuum: → Score all particles entering LAr volume in direction to field cage

Simplified detector model

• Scoring of background currently in light blue box as seen below

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used dimensions: 6.2m ⋅ 6.2m ⋅ 5.9m (!)

Background Composition: 7 GeV/c (H4)

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Background from Neutrons (7 GeV/c)

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1 GeV/c

• a. u.

375 Hz in NP04 in case of beam in H4

Background from Neutrons (7 GeV/c)

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Kinetic energy cutoff @ 10 MeV

10 GeV/c 1 GeV/c 0.1 GeV/c

• a. u.

375 Hz in NP04 in case of beam in H4

Background from Muons (7 GeV/c)

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Kinetic energy cutoff @ 10 MeV

10 GeV/c 1 GeV/c 0.1 GeV/c

• a. u.

312 Hz in NP04 in case of beam in H4

Muons & Neutrons

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Target Momenta of VLE-magnets

𝜈 𝑜

Full model: H2-beam on

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23 Particles scored in NP04 Fieldcage volume when H2 beam is on Detector materials currently vacuum: → Score all particles entering LAr volume in direction to field cage

Background Composition 12 GeV/c

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NP02 “filled” with Vacuum

Background Composition 12 GeV/c

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NP02 filled with LAr

Density: 1.396 g/cm3

NP02 filled with Water (for cross-check) < 10 Hz < 10 Hz

Background from Muons (12 GeV/c)

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10 GeV/c 1 GeV/c 0.1 GeV/c

• a. u.

NP02 filled with Vacuum (40 Hz), much less in case of LAr (or Water)

Background from Muons (12 GeV/c)

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Kinetic energy cutoff @ 10 MeV

10 GeV/c 1 GeV/c 0.1 GeV/c

• a. u.

NP02 filled with Vacuum (40 Hz), much less in case of LAr (or Water)

Background from Neutrons (12 GeV/c)

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Kinetic energy cutoff @ 10 MeV

10 GeV/c 1 GeV/c 0.1 GeV/c

• a. u.

NP02 filled with Vacuum (127 Hz), much less in case of LAr (or Water)

Background Studies PhysicsList Comparison

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Comparison of Background in NP02

• Geant4 PhysicsLists:
• FTFP_BERT

Shielding

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Beam in H2, scored in NP02 (detector “filled” with Vacuum)

(recommended list for shielding simulations) 200 Hz increase of n similar estimates as FTFP_BERT

Comparison of Background in NP02

• Geant4 PhysicsLists:
• FTFP_BERT

Shielding

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Beam in H4, scored in NP02 (detector “filled” with Vacuum)

(recommended list for shielding simulations)

Comparison of Background in NP04

• Geant4 PhysicsLists:
• FTFP_BERT

Shielding

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Beam in H4, scored in NP04 (detector “filled” with Vacuum)

(recommended list for shielding simulations)

Summary

• Detailed, combined model for H2 and H4 with VLE extensions

implemented

• New estimates of the trigger rates available for H4-VLE
• nTuples for H4 will be made available on shared beamgroupdisk
• Similar results of Background for different PhysicsLists

“FTFP_BERT” and “Shielding”

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