Resistive Micromegas Multigen 2D for Muon tomography Simon - - PowerPoint PPT Presentation

▶
resistive micromegas multigen 2d for muon tomography
SMART_READER_LITE
LIVE PREVIEW

Resistive Micromegas Multigen 2D for Muon tomography Simon - - PowerPoint PPT Presentation

Oct 11, 2023 119 likes •310 views

MultiGen prototype Absorption tomography Deviation tomography Resistive Micromegas Multigen 2D for Muon tomography Simon Bouteille CEA/DSM/Irfu/SPhN R&D-51 mini week, 9 th December, 2014 Resistive Micromegas Multigen 2D for Muon

slide-1
SLIDE 1

MultiGen prototype Absorption tomography Deviation tomography

Resistive Micromegas Multigen 2D for Muon tomography

Simon Bouteille

CEA/DSM/Irfu/SPhN

R&D-51 mini week, 9th December, 2014

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN

slide-2
SLIDE 2

MultiGen prototype Absorption tomography Deviation tomography

Outline

1 MultiGen prototype

Genetic multiplexing Detector overview Efficiency Capacitance studies

2 Absorption tomography

Principle First results WatTo experiment

3 Deviation tomography

Principle PoCA reconstruction Likelihood reconstruction

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN

slide-3
SLIDE 3

MultiGen prototype Absorption tomography Deviation tomography

Genetic multiplexing

  • One particle : signal in multiple adjacent strips
  • Identify n-uplet position is enough
  • 1024 strips → 61 electronic channels

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN

slide-4
SLIDE 4

MultiGen prototype Absorption tomography Deviation tomography

Detector overview

  • Dimensions : 50 × 50cm2
  • Resistive
  • 2D : 2 perpendicular layer of

readout strips

  • Multiplexed

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN

slide-5
SLIDE 5

MultiGen prototype Absorption tomography Deviation tomography

Detector overview

  • Asymetry :
  • Strips parrallel

with resistive strips

  • Strips

perpendicular with resistive strips

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN

slide-6
SLIDE 6

MultiGen prototype Absorption tomography Deviation tomography

Efficiency

  • At maximum gain

(amplification field : ∼ 4 · 106 Vm−1)

  • Cosmic bench configuration :
  • 3 2D tracking detectors
  • 1 2D tested detector
  • Clustering consideration
  • Noise in strips

perpendicular wrt. resistive strips

  • 1 strip without signal

allowed in clustering

  • Efficiency of the perpendicular

coordinate :

  • Before correction : 96%
  • After correction : 97%

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN

slide-7
SLIDE 7

MultiGen prototype Absorption tomography Deviation tomography

Capacitance studies

  • Observations :
  • Multiplexing increase detector capacitance
  • Dream electronics (CLAS12)
  • Average S/B with protected chips (220 pF decoupling

capacitor)

  • Poor S/B with unprotected chips
  • Decoupling capacitor can be optimized to miximise S/B
  • AGET/Feminos electronics (MINOS)
  • Different capacitor for each chip (from 220 pF to 2 nF)
  • Data taking : finished
  • Analysis : in progress

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN

slide-8
SLIDE 8

MultiGen prototype Absorption tomography Deviation tomography

Outline

1 MultiGen prototype

Genetic multiplexing Detector overview Efficiency Capacitance studies

2 Absorption tomography

Principle First results WatTo experiment

3 Deviation tomography

Principle PoCA reconstruction Likelihood reconstruction

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN

slide-9
SLIDE 9

MultiGen prototype Absorption tomography Deviation tomography

Principle

  • Flux measurement
  • Reconstruction :
  • Flux difference between 2

runs

  • Substraction of

acceptance effects

  • Comparison with

simulations

  • Easy to setup
  • Poor resulution : ∼1 muon
  • ut of 100 are stopped by

10 cm of lead

  • High acquisition time

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN

slide-10
SLIDE 10

MultiGen prototype Absorption tomography Deviation tomography

Principle

  • Suited to study large objects
  • Applications :
  • Volcanology
  • Mining exploration

DIAPHANE project (IPGP, IPNL)

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN

slide-11
SLIDE 11

MultiGen prototype Absorption tomography Deviation tomography

First results

  • Cosmicbench :
  • 50 × 50cm2 detectors
  • 6 1D layers
  • 10 cm thick lead bricks
  • 2 days of data (trigger rate :

∼6 Hz)

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN

slide-12
SLIDE 12

MultiGen prototype Absorption tomography Deviation tomography

WatTo experiment

  • Start date : march-april

2015

  • Saclay’s watter tower

tomography

  • 3-4 Multigen 2D telescope
  • 45◦ inclination
  • Why ?
  • Test the detector outside
  • Test the electronic outside
  • Test low consumption HV

modules

  • Test on battery power
  • Test image quality versus

time of acquisition

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN

slide-13
SLIDE 13

MultiGen prototype Absorption tomography Deviation tomography

WatTo experiment

Simulations :

  • Monitoring of the water

height

  • Tank without water
  • Tank full of water

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN

slide-14
SLIDE 14

MultiGen prototype Absorption tomography Deviation tomography

Outline

1 MultiGen prototype

Genetic multiplexing Detector overview Efficiency Capacitance studies

2 Absorption tomography

Principle First results WatTo experiment

3 Deviation tomography

Principle PoCA reconstruction Likelihood reconstruction

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN

slide-15
SLIDE 15

MultiGen prototype Absorption tomography Deviation tomography

Principle

  • Multiple scattering
  • x

θ

  • measurement at both end
  • 3D image
  • More information used wrt.

absorption tomography

  • Reduce acquisition time
  • Need a model for

reconstruction

  • No real data results at the

moment

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN

slide-16
SLIDE 16

MultiGen prototype Absorption tomography Deviation tomography

PoCA reconstruction

  • Simplest reconstruction
  • Point Of Closest Approch
  • middle of shortest segment

between incoming trajectory and outgoing trajectory

  • Acceptance effect sensitive
  • Lot of non-used information
  • Density map is the PoCA

distribution

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN

slide-17
SLIDE 17

MultiGen prototype Absorption tomography Deviation tomography

Likelihood reconstruction

  • Based on maximum likelihood

method

  • Deviation angle distributed on

a gaussian

  • σθ ∝ 1/ρ
  • Each muon contribute to the

density of every voxel he passes through

  • Proportionnal to the

deviation ∆x inside the voxel

  • Inversely proportionnal to the

path length inside the voxel

Resistive Micromegas Multigen 2D for Muon tomography CEA/DSM/Irfu/SPhN