Markus Köhli M.Klein, U. Schmidt AG Dubbers

Transcription

1 DENIM Budapest Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Markus Köhli M.Klein, U. Schmidt AG Dubbers

2 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]

3 Heidelberg Research Fields 2 COSMOS Project, UFZ Leipzig Ground water sensing by cosmic ray induced neutron showers

4 The Detector

5 The CASCADE Detector 3 CASCADE detector without housing

6 The CASCADE Detector 3 CASCADE detector without housing Active Detection Volume Readout Electronics

7 The CASCADE Concept 4 Casing Thin (Boron) Layer Readout

8 The CASCADE Concept 4 Casing Thin (Boron) Layer charge transparent substrate Readout

9 The CASCADE Concept 4 GEM (Gas Electron Multiplier foil)

10 The CASCADE Concept 4 c c c c

11 The CASCADE Concept 4

12 The CASCADE Concept 4 thin gap measures de/dx c c c c

13 Readout 5 Unit Cell: Y stripes 1.56 mm X stripes 128x128 channels Crossed stripes: reduces noise correlating x and y

14 CIPix Readout ASIC 6 64 channels 10 MHz (40 MHz) readout clock Timeline FElix chip (RD20, LHC) [1993] HELIX 1.0 HELIX 32 [1998] HELIX (HERA-B) HELIX (Zeus) CIPix (H1) BEETLE (LHCb) [1]

15 nxyter ASIC channels 1 ns time resolution Token Ring Readout [1] [1] The n-xyter Reference Manual 1.50, 2009

16 nxyter Prototype channels 1 ns time resolution Token Ring Readout [1] [1] The n-xyter Reference Manual 1.50, 2009

17 nxyter Prototype 7

18 Characterization Measurements

19 Characterization Measurements

20 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

21 S(q,t) Spin Echo: Diffusion of micelles 8b D 7 cm s 2 Natriumdodecylsulfat in D 2 O 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 Spin Echo time t [ns]

22 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)

23 _count_ Spin Echo Measurements Polarisation 69.6 % space RESEDA, FRMII: spectrometer arms % FWHM Typical Spin Echo group _B 3_

24 _count_ Spin Echo Measurements Polarisation 69.6 % space Graphite Sample Typical Spin Echo group _B 3_

25 _count_ Spin Echo Measurements khz x16 time Polarisation 69.6 % space Graphite Sample Typical Spin Echo group _B 3_

26 _count_ Spin Echo Measurements khz x16 time Polarisation 69.6 % space Graphite Sample Typical Spin Echo group _B 3_

27 _count_ Spin Echo Measurements khz x16 time Polarisation 69.6 % space Graphite Sample Typical Spin Echo group _B 3_

28 _count_ Spin Echo Measurements khz x16 time Polarisation 69.6 % space Graphite Sample Typical Spin Echo group _B 3_

29 _count_ Spin Echo Measurements Polarisation 69.6 % space Graphite Sample Typical Spin Echo group _B 3_

30 _count_ Spin Echo Measurements Polarisation 69.6 % space Graphite Sample Typical Spin Echo group _B 3_

31 Spatial Resolution 10 Image of a cold neutron beam (after guide) Spatial resolution: 2.4 mm FWHM Log (Intensity) Cadmium FRM II

32 Spatial Resolution 10 Cross section of a collimated n beam Spatial resolution: 2.4 mm FWHM

33 Instantaneous Rate [Hz] Rate Capability 11 count rate 2-3 MHz 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 Background due to - neutron gas at ILL/PF1A - and leaking chopper! Neutron TOF for 108cm [ms]

34 Detection Efficiency Efficiency at 0.8 Å and 1.2 Å in 2D and FRM II

35 Detection Efficiency Simulation of the 2D efficiency and data of 0.8 Å and 1.2 Å 1.8 Å

36 Detection Efficiency 14 Simulation of the 2D efficiency with different coating thicknesses 5.4 Å 3.5 Å 1.8 Å 1.0 Å

37 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

38 Conversion Products: Energy Spectra 15 Li α

39 Conversion Products: Energy Spectra 15 Li α

40 Conversion Products: Energy Spectra 15 Li α

41

42 Boron-10 technology

43 Boron-10 technology a high rate, spatially and time resolved detector for Spin Echo applications

44 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 6 layers (21% in new configuration)

45 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 6 layers (21% in new configuration)

46 The road to go?

47 The road to go? GEM Multichannel ASIC Technology available in 2000

48 The road to go? GEM TPC Multichannel ASIC TimePix Technology available in 2000 Technology available in 2015

49 The road to go? GEM TPC Multichannel ASIC TimePix Technology available in 2000 Technology available in 2015 Particle Flow

50 The road to go? GEM TPC Multichannel ASIC TimePix Technology available in 2000 Technology available in 2015 Particle Flow

51 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 6 layers (21% in new configuration)

52 Backup