DENIM 2015 - Budapest Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Markus Köhli M.Klein, U. Schmidt AG Dubbers
Heidelberg Research Fields 1 Helium-Xenon EDM [test of Lorentz invariance] 10 B Neutron Detectors [large area and high time resolution] PERC and PERKEO [v ud via neutron beta decay] Spin Echo Atomic Beam Spin Echo [Berry phase and Casimir force]
Heidelberg Research Fields 2 COSMOS Project, UFZ Leipzig Ground water sensing by cosmic ray induced neutron showers
The Detector
The CASCADE Detector 3 CASCADE detector without housing
The CASCADE Detector 3 CASCADE detector without housing Active Detection Volume Readout Electronics
The CASCADE Concept 4 Casing Thin (Boron) Layer Readout
The CASCADE Concept 4 Casing Thin (Boron) Layer charge transparent substrate Readout
The CASCADE Concept 4 GEM (Gas Electron Multiplier foil)
The CASCADE Concept 4 c c c c
The CASCADE Concept 4
The CASCADE Concept 4 thin gap measures de/dx c c c c
Readout 5 Unit Cell: Y stripes 1.56 mm X stripes 128x128 channels Crossed stripes: reduces noise correlating x and y
CIPix Readout ASIC 6 64 channels 10 MHz (40 MHz) readout clock Timeline FElix chip (RD20, LHC) [1993] HELIX 1.0 HELIX 32 [1998] HELIX128-2.2 (HERA-B) HELIX128-3.0 (Zeus) CIPix (H1) BEETLE (LHCb) [1]
nxyter ASIC 7 128 channels 1 ns time resolution Token Ring Readout [1] [1] The n-xyter Reference Manual 1.50, 2009
nxyter Prototype 7 128 channels 1 ns time resolution Token Ring Readout [1] [1] The n-xyter Reference Manual 1.50, 2009
nxyter Prototype 7
Characterization Measurements
Characterization Measurements
Neutron Resonance Spin Echo - MIEZE 8 Principle: Use Neutron Spin as Obervable in Interference Time Of Flight Experiments Spin precession Reverse Spin precession Detector Sample z x s x v Time dependent scattering at sample causes loss in polarization
S(q,t) Spin Echo: Diffusion of micelles 8b 1.0 0.9 D 7 cm 8.09 10 s 2 Natriumdodecylsulfat in D 2 O 0.8 0.7 0.6 0.5 0.4-1 Qlow =0.11 Å -1 Qmean=0.12 Å -1 Qhigh=0.13 Å Exp. Fit of data low at Exp. Fit of data at Exp. Fit of data at mean high Q Q Q for classical diffusion : ~ 2 Dq t S ( q, t) e inc 0.1 2 3 4 5 6 789 1 2 3 4 5 6789 10 Spin Echo time t [ns]
Neutron Resonance Spin Echo - MIEZE 8 Principle: Use Neutron Spin as Obervable in Interference Time Of Flight Experiments Spin precession Reverse Spin precession Detector Sample z x s x v O (100 khz) O (1 mm)
_count_ Spin Echo Measurements 9 8000 Polarisation 69.6 % space RESEDA, FRMII: spectrometer arms 3 15 Å @ 11% FWHM 7000 6000 5000 4000 3000 2000 0.6 0.8 1.0 Typical Spin Echo group _B 3_ 1.2 1.4
_count_ Spin Echo Measurements 9 8000 7000 Polarisation 69.6 % space 6000 5000 4000 3000 Graphite Sample 2000 0.6 0.8 1.0 Typical Spin Echo group _B 3_ 1.2 1.4
_count_ Spin Echo Measurements 9 100 khz x16 time 8000 7000 Polarisation 69.6 % space 6000 5000 4000 3000 Graphite Sample 2000 0.6 0.8 1.0 Typical Spin Echo group _B 3_ 1.2 1.4
_count_ Spin Echo Measurements 9 100 khz x16 time 8000 7000 Polarisation 69.6 % space 6000 5000 4000 3000 Graphite Sample 2000 0.6 0.8 1.0 Typical Spin Echo group _B 3_ 1.2 1.4
_count_ Spin Echo Measurements 9 100 khz x16 time 8000 7000 Polarisation 69.6 % space 6000 5000 4000 3000 Graphite Sample 2000 0.6 0.8 1.0 Typical Spin Echo group _B 3_ 1.2 1.4
_count_ Spin Echo Measurements 9 100 khz x16 time 8000 7000 Polarisation 69.6 % space 6000 5000 4000 3000 Graphite Sample 2000 0.6 0.8 1.0 Typical Spin Echo group _B 3_ 1.2 1.4
_count_ Spin Echo Measurements 9 8000 7000 Polarisation 69.6 % space 6000 5000 4000 3000 Graphite Sample 2000 0.6 0.8 1.0 Typical Spin Echo group _B 3_ 1.2 1.4
_count_ Spin Echo Measurements 9 8000 7000 Polarisation 69.6 % space 6000 5000 4000 3000 Graphite Sample 2000 0.6 0.8 1.0 Typical Spin Echo group _B 3_ 1.2 1.4
Spatial Resolution 10 Image of a cold neutron beam (after guide) Spatial resolution: 2.4 mm FWHM Log (Intensity) Cadmium sheet @RESEDA FRM II
Spatial Resolution 10 Cross section of a collimated n beam Spatial resolution: 2.4 mm FWHM
Instantaneous Rate [Hz] Rate Capability 11 count rate 2-3 MHz 10 7 10 6 Time of Flight measurements at ILL/ PF1A on a single readout strip of 1cm 2 Maximum inst. rate: 2.7 MHz Maximum detected ever: 4 MHz Limit due to pre-amp pulse width 10 5 10 4 Background due to - neutron gas at ILL/PF1A - and leaking chopper! 10 3 10 2 0 5 10 15 20 25 30 Neutron TOF for 108cm [ms]
Detection Efficiency 12 1.5 0.8 1.0 1.0 0.8 2.0 Efficiency at 0.8 Å and 1.2 Å in 2D and 3D @HEIDI FRM II
Detection Efficiency 13 1.5 0.8 1.0 1.0 0.8 2.0 Simulation of the 2D efficiency and data of 0.8 Å and 1.2 Å 24.7% @ 1.8 Å
Detection Efficiency 14 Simulation of the 2D efficiency with different coating thicknesses 5.4 Å 3.5 Å 1.8 Å 1.0 Å
Conversion Products: Energy Spectra 15 Li α From 0.1 μm to 2 μm 10 B From 0.1 μm to 2 μm 10 B
Conversion Products: Energy Spectra 15 Li α
Conversion Products: Energy Spectra 15 Li α
Conversion Products: Energy Spectra 15 Li α
Boron-10 technology
Boron-10 technology a high rate, spatially and time resolved detector for Spin Echo applications
Boron-10 technology a high rate, spatially and time resolved detector for Spin Echo applications conversion layer identification high TOF resolution (100 ns readout) 2.4 mm FWHM spatial resolution 2 MHz rate capability 25% thermal neutron efficiency @ 6 layers (21% in new configuration)
Boron-10 technology a high rate, spatially and time resolved detector for Spin Echo applications conversion layer identification high TOF resolution (100 ns readout) 2.4 mm FWHM spatial resolution 2 MHz rate capability 25% thermal neutron efficiency @ 6 layers (21% in new configuration)
The road to go?
The road to go? GEM Multichannel ASIC Technology available in 2000
The road to go? GEM TPC Multichannel ASIC TimePix Technology available in 2000 Technology available in 2015
The road to go? GEM TPC Multichannel ASIC TimePix Technology available in 2000 Technology available in 2015 Particle Flow
The road to go? GEM TPC Multichannel ASIC TimePix Technology available in 2000 Technology available in 2015 Particle Flow
Boron-10 technology a high rate, spatially and time resolved detector for Spin Echo applications conversion layer identification high TOF resolution (100 ns readout) 2.4 mm FWHM spatial resolution 2 MHz rate capability 25% thermal neutron efficiency @ 6 layers (21% in new configuration)
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