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Tailoring the phase space volume for Instruments at CANS. 17 October 2019 I Paul Zakalek. High Brilliance Neutron Source . Target Moderator Reflector 3 Stations with each: 100 kW average 100 mA peak < 2% duty factor. Beam Multiplexer (2 nd floor) Pulse Distribution to TMRs
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Tailoring the phase space volume for Instruments at CANS 17 October 2019 I Paul Zakalek
High Brilliance Neutron Source • Target Moderator Reflector • 3 Stations with each: • 100 kW average • 100 mA peak • < 2% duty factor • Beam Multiplexer (2nd floor) • Pulse Distribution to TMRs • 24 Hz, 96 Hz, 384 Hz • 833 µs, 208 µs, 52 µs • LINAC • 70 MeV protons • 100 mA peak • < 6% duty factor
Target / Moderator / Reflector Unit Protons Neutrons
Target ROOM Concrete shielding Moderator Shielding Neutron guide Reflector
Target ROOM Concrete shielding 4 m 0.8 m 1.4 m 4 m 0.2 m Moderator Shielding Neutron guide Reflector Distance 0.4 m 2 m 6 m 7.4 m 0 m 0.1 m
Free parameters at CANS • Pulse length λ resolution • Frame length bandwidth • Duty cycle time resolution (λelastic, λf) vs. intensity • Size of channel brilliance vs. integral intensity • Cold moderator spectrum • (Reflector decay time of thermal neutrons) • Instrument length bandwidth, intensity of epithermal / fast neutrons • Optics brilliance transfer, phase space
Target / Moderator / Reflector UNIT Neutrons Extraction channel 7 • Proton beam parameters • Duty cycle: 2% • Frequency: 24, 96, 384 Hz • Pulse width: 833, 208, 52 µs 6 Thermalmoderator 5 Proton beam • Cryogenic moderator inset 4 Frequency, duty cycle Φ [1012cm-2s-1mA-!] 3 2 Target 1 Reflector 20 cm 20 17 October 2019 Page 7
Target / Moderator / Reflector UNIT Neutrons Extraction channel 7 • Proton beam parameters • Duty cycle: 2% • Frequency: 24, 96, 384 Hz • Pulse width: 833, 208, 52 µs • Extraction channel • Radius: 0.5 cm, ... 3 cm • Cryogenic moderator inset 6 Thermalmoderator 5 Proton beam • Cryogenic moderator inset 4 Frequency, duty cycle Φ [1012cm-2s-1mA-!] 3 Target 2 Reflector 1 20 20 cm 17 October 2019 Page 8
Target / Moderator / Reflector UNIT Neutrons Extraction channel 7 • Proton beam parameters • Duty cycle: 2% • Frequency: 24, 96, 384 Hz • Pulse width: 833, 208, 52 µs • Extraction channel • Radius: 0.5 cm, ... 3 cm • Cryogenic moderator inset • Cryogenic moderator • Material: Para-H2, Methan 6 Thermalmoderator 5 Proton beam • Cryogenic moderator inset 4 Frequency, duty cycle Φ [1012cm-2s-1mA-!] 3 Target 2 Reflector 1 20 20 cm 17 October 2019 Page 9
Target / Moderator / Reflector UNIT Neutrons Extraction channel 7 • Proton beam parameters • Duty cycle: 2% • Frequency: 24, 96, 384 Hz • Pulse width: 833, 208, 52 µs • Extraction channel • Radius: 0.5 cm, ... 3 cm • Cryogenic moderator inset • Cryogenic moderator • Material: Para-H2, Methan • Reflector • Material: Be, Pb, Bor-PE 6 Thermalmoderator 5 Proton beam • Cryogenic moderator inset 4 Frequency, duty cycle Φ [1012cm-2s-1mA-!] 3 Target 2 Reflector 1 20 20 cm 17 October 2019 Page 10
HBS: multitarget source 384 Hz 96 Hz24 Hz 0 10 20 t[ms] 30 40 50 60 3 Target stations Repetition rate: 384 Hz 96 Hz 24 Hz Time frame: 2.6 ms 10.4 ms 41.7 ms Ion pulse length: 52 µs 208 µs 832 µs Duty cycle: 2 % Page 11
Pulse width optimization 200 µs built-up 200 µs decay Integral constant
Extraction channels Neutronic spectra Thermic Extraction Channel Crogenic insert
Extraction channels Neutronic spectra
Cryogenic moderator optimization Para-hydrogen moderator
Reflectometer Selene concept [J. Stahn et al., Eur. Phys. J. Appl. Phys. (2012) 58: 11001] Polarizator Sample Spin-Flipper Source Diaphragma Frame Overlap Chopper Slit System Detector
Reflectometer Selene concept [J. Stahn et al., Eur. Phys. J. Appl. Phys. (2012) 58: 11001] Polarizator Sample Spin-Flipper Source Diaphragma Frame Overlap Chopper Slit System Detector
Reflectometer Selene concept Transfere the whole divergence to the sample • Moderator: para-H2 • Frequency: 24 Hz → 833 µs • Divergence: 1.5 ° • Wavelength band: 7.4 Å • Wavelength resolution: 1.4 % - 5.1 % • Flux: 107 s-1cm-2 (High intensity mode) → Comparable to MARIA @ FRM II
PowDer Diffractometer Basic Instrument 2 m 60 m 25 m Sample BandwidthChopper Detector Double DiscChopper
PowDer Diffractometer Basic Instrument 2 m 60 m 25 m Sample BandwidthChopper Detector Double DiscChopper • Moderator: PE • Frequenzy: 96 Hz → 208 µs • Resolution Δd/d: 0.028 • Wavelength band: 0.69 Å • Brilliance 5*1010 cm-2s-1sr-1(mAs)-1
PowDer Diffractometer High Intensity 2 m 100 m 50 m Sample BandwidthChopper Detector Double DiscChopper • Moderator: PE • Frequenzy: 24 Hz → 833 µs • Resolution Δd/d: 0.0044 - 0.014 at 90° 0.011 – 0.12 at 7° • Wavelength band: 1.65 Å • Brilliance 4*109 cm-2s-1sr-1(mAs)-1
PowDer Diffractometer High Resolution 2 m 100 m 50 m Sample BandwidthChopper Detector Double DiscChopper • Moderator: PE • Frequenzy: 24 Hz → 833 µs • Resolution Δd/d: 0.0059 - 0.0017 at 90° 0.044 at 7° • Wavelength band: 1.65 Å • Brilliance 5*108 cm-2s-1sr-1(mAs)-1
Conclusion • Instrument developmentat CANS canmakeuseofnewdegreesoffreedom: • Spectrum • Pulse timing • High divergence, shortdistances • Trade betweenBrillianceandIntensity
Conclusion • Instrument developmentat CANS canmakeuseofnewdegreesoffreedom: • Spectrum • Pulse timing • High divergence, shortdistances • Trade betweenBrillianceandIntensity Outlook • Further optimization of TMR unit • Moderator materials like Methane, o/p-Hydrogen will be developed
HBS Team ZEA-1: Y. Bessler M. Butzek - Engineering IKP-4: O. Felden R. Gebel A. Lehrach D. Prasuhn - Nuclear physics M. Bai W. Barth - Accelerator S. Böhm J.P. Dabruck R. Nabbi - Nuclear simul. J. Baggemann Th. Brückel T. Cronert P.-E. Doege T. Gutberlet J. Li E. Mauerhofer M. Rimmler M. Strothmann U. Rücker J. Voigt P. Zakalek - coregroup:design, experimental verification, instrumentation C. Lange T. Langnickel Ch. Haberstroh M. Klaus S. Eisenhut - AKR-2, liquid H2 / HIM H. Podlech O. Meusel - Accelerator
HBS Team THANK YOU FOR YOUR ATTENTION ZEA-1: Y. Bessler M. Butzek - Engineering IKP-4: O. Felden R. Gebel A. Lehrach D. Prasuhn - Nuclear physics M. Bai W. Barth - Accelerator S. Böhm J.P. Dabruck R. Nabbi - Nuclear simul. J. Baggemann Th. Brückel T. Cronert P.-E. Doege T. Gutberlet J. Li E. Mauerhofer M. Rimmler M. Strothmann U. Rücker J. Voigt P. Zakalek - coregroup:design, experimental verification, instrumentation C. Lange T. Langnickel Ch. Haberstroh M. Klaus S. Eisenhut - AKR-2, liquid H2 / HIM H. Podlech O. Meusel - Accelerator