Phase 1 Design for LOKI at ESS: performance evaluation of suitable detector technologies Or how to build detectors for ESS Kalliopi Kanaki Andrew Jackson.

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Presentation transcript:

Phase 1 Design for LOKI at ESS: performance evaluation of suitable detector technologies Or how to build detectors for ESS Kalliopi Kanaki Andrew Jackson Clara Lopez Richard Hall-Wilton

Outline Three neutron instruments approved by the ESS Steering Committee (STC) in 2013 for preliminary design phase 1: – NMX: Neutron Macromolecular Crystallography – Odin: Optical and Diffraction Imaging with Neutrons – LOKI: small angle neutron scattering (SANS) Introduction to LOKI Project phases until start of operations Functional detector requirement analysis Evaluation tools and preliminary results 2

Small Angle Neutron Scattering with LOKI Soft matter, biophysics and material studies Emphasis on spatial and temporal heterogeneity Spatial resolution down to nm scale Sub-second time resolution High neutron flux (10 9 n/cm 2 /s on sample) Broad λ band (2Å-12Å) and wide-angle scattering Wide Q range accessed simultaneously ( few Å -1 ) 3

LOKI at a glance 4 Bender: r = 78 m l = 4 m Variable Opening Choppers Guide 3 cm x 3 cm Collimation up to 10m Optional Focusing Optics Detector: 10m

Approved Instrument Project Phases 5 Tollgate 2 decision December 2014 December 2016 January 2014 June 2019 December 2019

From Construction to Operations 6 14 proposals were evaluated in May Recommendation of evaluated instruments for entering phase 1 in 2015 will follow

Phase 1 Design Duties Conceptual development of the instrument detectors Performance evaluation Geometry & technology selection to be fully pursued during final design phase 2 Schedule In-kind plan for construction Define envelopes in engineering drawings Draft commissioning plan (cold & hot) Budget estimate Risk mitigation strategy Interface identification (organizational & physical) 7

Functional requirements for LOKI detectors 8 Polar angle resolution Wavelength resolution Time of Flight resolution Detection efficiency Instantaneous rate capability Stability Background tolerance ( intrinsic detector noise, natural components activity, cosmics, prompt pulse & secondaries escaping the guides - γ and fast neutrons - shielding, neighbouring instruments, sample-dependent background (incoherent, inelastic scattering) ) Separate studies per detector technology, geometry and particle species

Studies on γ induced background (MultiGrid detector, ILL/ESS/Linköping collaboration) 9 A. Khaplanov et al., JINST 8, P10025 (2013) neutron efficiency: analytically calculated, simulated, measured γ efficiency comparable to 3 He scattering understood detector induced background understood working on detector standards for reliable comparisons

Collaborative background studies with PSI ESS Detector & Neutron Optics and Shielding groups 10 measurements at the SINQ target paper in preparation N. Cherkashyna et al.

Collaborative background studies with SNS ESS Detector & Neutron Optics and Shielding groups 11 paper in preparation D. DiJulio et al.

Measurements & Simulations 12 SINQ source G4 model neutron dose map around the SNS target and POWGEN instrument hit distributions in Medipix detector at SNS

Possible LOKI detector geometries: window frame 13 outer frame: 3m x 3m, inner empty frame: 1m x 1m outer frame: 2.4m x 2.4m, inner empty frame: 0.4m x 0.4m 0.5m x 0.5m possibility for sliding

Possible LOKI detector geometries: 10 B-lined barrel 14 2π solid angle coverage for efficient data taking Length = 10 m, width = 0.5 m, 10 B 4 C layer thickness = 1 μm Back-scattering detection mode with MWPC Higher efficiency and resolution at forward angles Detector and electronics outside the vacuum tank Cheap, simple and easy to handle arrangement Small size vacuum tank due to tube dimensions Multi-parameter optimization 14 K. Kanaki et al., J. Appl. Cryst. 46, 1031–1037 (2013) not-to-scale vacuum tank detector banks sample coating θ 10 B 4 C coating

Evaluation Tools Analytical calculations McStas (MC): neutron ray-trace simulation package Geant4 (MC): particle tracking and interactions Garfield/Garfield++: ionization in gases, signal formation Prototyping R&D running in parallel 15 DENEX detector single cell counter

Polar angle resolution (analytical) 10 B-lined barrel 16 efficiency Q resolution Capture and ion escape included in the calculations Back-scattering efficiency Q resolution is detector-specific K.Kanaki et al., J. Appl. Cryst. 46, 1031–1037 (2013) F. Piscitelli and P. van Esch, JINST 8, P04020 (2013) F. Piscitelli, Ph.D. thesis, University of Perugia (2013)

Pre- and post sample λ distribution (McStas) water sample, 2m collimation 17 n/s λ (Å)

Efficiency & Scattering Studies (Geant4) 18 no scatteringwith scattering

LOKI schedule for detector R&D and construction 19

Summary LOKI entered conceptual design phase in 2014 Multiple front effort – analytical calculations – simulations – R&D – measurements in spallation facilities – evaluation for different detector geometries Evaluation tools in place Requirements collection process on-going Performance of detector solutions on-going Tollgate decision end of 2014 for technologies entering final design phase Instrument construction at ESS is underway 20