WLS fibre detector development at ISIS Jeff Sykora

WLS fibre detector development at ISIS Jeff Sykora, Erik Schooneveld and Nigel Rhodes SINE 2020 Meeting Industry day 13 June 2017

Overview Ø Scintillator + WLS fibre detectors ØBasic operation ØIndividual major industrial components Ø ISIS contribution to SINE 2020 WP 9 Ø Other scintillator detector development lines

Scintillator detectors Scintillator Light transport Light detector (PMT, Si. PM, etc. ) “Preamp”/Signal Shaping Signal Processing Discriminator Display/Data Acquisition

Scintillator + WLSF detectors Activator type scintillation 3 H n 0 Conduction band α, T 4 He Eg Valence band Zn. S: Ag 6 Li. F Neutron Scintillator WLSF

Major industrial components Ø Scintillator Ø Development opportunities available/underway Ø Already have a good working relationship with Scintacor

Major industrial components Ø Scintillator Ø Development opportunities available/underway Ø Already have a good working relationship with Scintacor Ø Fibres

Major industrial components Ø Scintillator Ø Development opportunities available/underway Ø Already have a good working relationship with Scintacor Ø Fibres Ø PMTs Ø Development opportunities available/underway

Major industrial components Ø Scintillator Ø Development opportunities available/underway Ø Already have a good working relationship with Scintacor Ø Fibres Ø PMTs Ø Development opportunities available/underway Ø Scintillator/fibre prep

Major industrial components Ø Scintillator Ø Development opportunities available/underway Ø Already have a good working relationship with Scintacor Ø Fibres Ø PMTs Ø Development opportunities available/underway Ø Scintillator/fibre prep Ø Detector mechanics Ø 3 D printing Ø Machining Ø Shielding Ø Magnetic screening Ø Neutron shielding

Major industrial components Ø Scintillator Ø Development opportunities available/underway Ø Already have a good working relationship with Scintacor Ø Fibres Ø PMTs Ø Development opportunities available/underway Ø Scintillator/fibre prep Ø Detector mechanics Ø 3 D printing Ø Machining Ø Shielding Ø Magnetic screening Ø Neutron shielding Ø Electronics

Major industrial components Ø Scintillator Ø Development opportunities available/underway Ø Already have a good working relationship with Scintacor Ø Fibres Ø PMTs Ø Development opportunities available/underway Ø Scintillator/fibre prep Ø Detector mechanics Ø 3 D printing Ø Machining Ø Shielding Ø Magnetic screening Ø Neutron shielding Ø Electronics Ø Assembly

Overview Ø Scintillator + WLS fibre detectors ØBasic operation ØIndividual major industrial components Ø ISIS contribution to SINE 2020 WP 9 Ø Other scintillator detector development lines

Work package 9. 2. 1 Ø Development of a Zn. S scintillation detector with WLS fibre readout for high rate reflectometry ØDetector hardware ØPMT readout hardware ØInitial report ØFinal report

Reflectometer requirements on ISIS Ø 2 D PSD Ø 1 x 1 mm 2 acceptable Ø 0. 5 x 6 mm 2 acceptable Ø 0. 5 x 0. 5 mm 2 preferable Ø 500 mm x 300 mm total size Ø High efficiency Ø 0. 5 – 15 Å range Ø Good uniformity Ø Large dynamic range Ø High rate capability

Work package 9. 2. 1 Ø Solution Ø Zn. S: Ag coupled to FP PMTs with WLS fibre Ø Distribute fibres over a large number of PMT channels (i. e. high pixilation)

Overview Ø Scintillator + WLS fibre detectors ØBasic operation ØIndividual major industrial components Ø ISIS contribution to SINE 2020 WP 9 Ø Other scintillator detector development lines

Powder diffraction IMAT/HRPD/E-MAP Ø IMAT Ø HRPD Ø Diffraction detectors up to ~18 m 2 Ø 4 mm x 100 mm resolution Ø 90 degree bank 2. 5 m 2 Ø Ø 40 FP PMTs 8 m 2 scintillator ~14, 000 fibres Mechanics Ø Diffraction detectors up to ~14 m 2 Ø 5 mm x 200 mm resolution

Inelastic Neutron Scattering Ø Large area – LET = 40 m 2 Ø 2 D – 25 mm position resolution Ø Energy range 0 – 80 me. V Ø Good uniformity Ø High efficiency Ø Low background Current: Resistive Wire technology

Ø Varying areas/angular coverage Ø 2 D PSD Ø 1 x 1 mm 2 acceptable Ø 0. 5 x 0. 5 mm 2 preferable Ø Good uniformity Ø High efficiency Ø Low background Single crystal diffraction SXD/LMX

Investigating scintillators Ø Need detectors with high rate capabilities Ø Zn. S: Ag is limited by afterglow Scintillator Ø Need alternatives Ø Faster? Zn. O: Zn/Li. F* Ø Sufficient gamma rejection? Ø Made in large quantities? CLYC: Ce Ø Affordable? 3 H n 0 4 He 2: 1 ratio Zn. O: Zn 3. 5 μm grains 6 Li. F Decay time (μs) PL peak (nm) PL range (nm) Hygroscopic Effective Fibre coupling Gamma sensitivity ~1. 7 500 440 -590 No Transparent Kuraray Green. Orange <10 -5 6. 3, 1. 4 and 0. 45*3 374 355– 440 Yes Kuraray UVBlue (1/2) ~2*10 -5

Summary Ø Advancing the rate capability for reflectometers is progressing under SINE 2020 Ø There has been a huge amount of R&D progress in scintillator detector technology Ø ISIS is developing several detector technologies for a wide range of neutron scattering applications Ø Industry involvement is critical to continuing progression

Thank you!