Results of H2 VLE Simulations 23.10.2017, Marcel Rosenthal, Nikolaos - - PowerPoint PPT Presentation

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Results of H2 VLE Simulations 23.10.2017, Marcel Rosenthal, Nikolaos - - PowerPoint PPT Presentation

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Results of H2 VLE Simulations 23.10.2017, Marcel Rosenthal, Nikolaos Charitonidis, Yannis Karyotakis, Yiota Chatzidaki Outline Updates on Geometry New optics Definition of GoodParticles Comparison of optics Particle

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SLIDE 1

Results of H2 VLE Simulations

23.10.2017, Marcel Rosenthal, Nikolaos Charitonidis, Yannis Karyotakis, Yiota Chatzidaki

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SLIDE 2

Outline

  • Updates on Geometry
  • New optics
  • Definition of “GoodParticles”
  • Comparison of optics
  • Particle rates for 80 GeV/c secondaries
  • Particle rates for -80 GeV/c secondaries
  • Background Studies:
  • Beam in H2
  • Beam in H4
  • Electron Target Study

23.10.2017

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SLIDE 3

Geometry

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SLIDE 4

Updates on Geometry

  • Complete setup of combined model of H2 and H4

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Soil below floor for more realistic background estimation Upstream shielding of H4 around GIF. Thanks to our summer student Rachel Margraf Default G4BL magnet models for both beamlines More detailed models in VLE after tertiary target

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SLIDE 5

Updates on Geometry

  • Complete setup of combined model of H2 and H4

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More detailed models in VLE after tertiary target: Dipoles Quadrupoles Detailed shielding implemented for VLE section

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SLIDE 6

Dipoles

  • Bending magnets
  • Shaped stainless-steel pipes
  • aligned to optimize acceptance
  • Iron yokes and copper coils
  • Magnetic field map

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SLIDE 7

Quadrupoles

  • Quadrupoles
  • Round stainless-steel pipes
  • Iron yokes and copper coils
  • Magnetic field map extracted from

HALO software

  • Increased gap/aperture compared

to prior generic quad version

  • Pipe “serves” as obstacle/aperture

limitation

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SLIDE 8

Detectors

  • Detector
  • 4(5) layers:
  • Membrane: Fe
  • Insulation: Air
  • IronPlate: Fe
  • DetectorVolumes: Vacuum

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param FieldCageWidth=6230 FieldCageLength=6230 FieldCageHeight=5880 param LArWidth=8548 LArLength=8548 LArHeight=7900 param ironPlateThickness=10 param insulationThickness=798 param membraneThickness=2

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SLIDE 9

Pipes and Windows

  • Detailed pipe models in VLE section
  • Mylar windows

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SLIDE 10

Shielding

  • Comparison with reality
  • Many details implemented

from step files (Thanks to Sylvain Girod and Vincent Clerc)

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SLIDE 11

Optics

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SLIDE 12

y in mm z in mm

Comparison of tracks

  • Original by Nikos
  • High transmission optimization by Yiota (increase by ≈ 3% in G4BL)

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x in mm z in mm

12 GeV/c “GoodParticles”

Courtesy: Yiota Chatzidaki → see also previous talk

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SLIDE 13

“GoodParticle” Definition

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SLIDE 14

Schematic overview H2-VLE

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SLIDE 15

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

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SLIDE 16

Composition 80 GeV/c → 12 GeV/c

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(𝑱)

𝝆 𝑳 𝒒 𝝂 𝒇

(𝑱𝑱) (𝑱𝑱𝑱) (𝑱𝑾)

scored @ TRIG2

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SLIDE 17

Momentum Spectra @ TRIG2

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(𝑱) (𝑱𝑱𝑱)

Momentum of all “GoodParticles” for different options

Timing not considered

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SLIDE 18

In-Beam Muon Origin

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(𝑱) (𝑱𝑱𝑱)

  • a. u.

Only muons before TOF1 are counted in this option

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SLIDE 19

In-Beam Muon Origin vs. Momentum

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(𝑱) (𝑱𝑱𝑱)

  • a. u.

Taking into account decays in the GoodParticle definition allows for a more complete picture of the muon contribution

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SLIDE 20

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)

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SLIDE 21

Rates for 80 GeV/c

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SLIDE 22

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

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SLIDE 23

Total Rate

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  • M. Rosenthal

23 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

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SLIDE 24

Rates for -80 GeV/c

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SLIDE 25

Pion Rate

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25 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

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SLIDE 26

Total Rate

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  • M. Rosenthal

26 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

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SLIDE 27

Background Studies

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SLIDE 28

Full model: H2-beam on

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28 Particles scored in NP02 Fieldcage volume when H2 beam is on Detector materials currently vacuum: → Score all particles entering LAr volume in direction to field cage

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SLIDE 29

Background Composition 12 GeV/c

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SLIDE 30

Coordinates for NP02

  • Study distribution of background
  • Rotated cryostat
  • Project to new

coordinates:

  • 𝑦, 𝑨 → (𝑦, 𝑨)

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Beam x z z x

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SLIDE 31

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.
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SLIDE 32

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.
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SLIDE 33

Muons & Neutrons

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Target Momenta of VLE-magnets

𝜈 𝑜

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SLIDE 34

Charged Particles

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SLIDE 35

Full model: H4-beam on

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35 Particles scored in NP02 Fieldcage volume when H4 beam is on Detector materials currently vacuum: → Score all particles entering LAr volume in direction to field cage

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SLIDE 36

Background Composition: 7 GeV/c (H4)

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17 kHz of neutrons simulated for Vacuum (no LAr in detector volumes!) Is this an issue? Do we need additional shielding?

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SLIDE 37

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.
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SLIDE 38

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.
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SLIDE 39

Effect of beam pipes

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SLIDE 40

Composition / 80 GeV/c →1/12 GeV/c

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(𝑱𝑱𝑱)

𝝆 𝑳 𝒒 𝝂 𝒇

(𝑱𝑱𝑱) (𝑱𝑱𝑱) (𝑱𝑱𝑱)

Vacuum 1GeV/c Vacuum 12GeV/c Steel 1GeV/c Steel 12GeV/c

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SLIDE 41

Electron Target Study

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SLIDE 42

Study of 𝒇+ beam in H2-VLE

  • 60 GeV/c momentum of secondary beam
  • Very conservative: 90% positrons, 10% charged hadrons mixed in
  • Explore lead target as secondary target
  • Thicknesses: 5 to 30 mm
  • Tertiary Momenta: 1, 4, 8, 12 GeV/c
  • Radiation length of Pb ≈ 5 mm
  • After 1, 2, 3, 4, 5 𝑌0 : ≈ 22, 8, 3, 1, 0.4 GeV/c
  • Expectation: Optimum between 10 to 20 mm depending on tertiary

momentum

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SLIDE 43

𝒇+-rate for 𝟐𝟏𝟕 secondaries in 4.8 s

  • Expectation confirmed
  • Optimum at 10-15 mm

(one target used at all tertiary momenta)

  • Rate of “Good Particles”:
  • 10 - 20 kHz
  • Purity of “Good Particles”:
  • ≈ 100% electrons

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Target length (mm) Target length (mm) 12 GeV/c 8 GeV/c 1 GeV/c 4 GeV/c

10 kHz 12 kHz 16 kHz 16 kHz

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SLIDE 44

Summary

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

implemented

  • New estimates of the trigger rates available for H2-VLE
  • Rate increase due to more realistic quadrupoles with larger apertures is

compensated by implementing beam pipes

  • nTuples for H2 will be made available on shared beamgroupdisk this week

(/eos/experiments/neutplatform/protodune/npmcproddisk/beamgroupdisk/DP/v27c/)

  • Old GoodParticle definition inside!
  • H4-VLE estimations will follow soon after implementing the new Quay model
  • Electron/Positron yield using a lead target has been estimated
  • Multiple kHz for a 10-15 mm lead target at all momenta

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