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000877651 037__ $$aFZJ-2020-02364
000877651 041__ $$aEnglish
000877651 1001_ $$0P:(DE-Juel1)180458$$aSchwab, A.$$b0$$ufzj
000877651 1112_ $$aThe Japanese RIKEN Center for Advanced Photonics (RAP) and the Jülich Centre for Neutron Science (JCNS) fourth joint workshop on compact accelerator-driven neutron sources (CANS) special webinar$$cForschungszentrum Jülich$$d2020-06-22 - 2020-06-24$$g4th Joint RIKEN/HBS Workshop$$wGermany
000877651 245__ $$aA compact solid methane moderator system for the Jülich High Brilliance Neutron Source (HBS) prototype
000877651 260__ $$c2020
000877651 3367_ $$033$$2EndNote$$aConference Paper
000877651 3367_ $$2DataCite$$aOther
000877651 3367_ $$2BibTeX$$aINPROCEEDINGS
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000877651 3367_ $$0PUB:(DE-HGF)6$$2PUB:(DE-HGF)$$aConference Presentation$$bconf$$mconf$$s1592829979_25977$$xInvited
000877651 520__ $$aDuring the last year two cryogenic moderators for the Jülich High Brilliance Neutron Source (HBS) project were tested at the COSY facility at the Jülich Research Centre. Time-of-flight spectra were measured for solid mesitylene at different temperatures (24 K to 300 K) and liquid hydrogen for different ortho-para-ratios (25% to approx. 100% p-H2). An attempt to increase the cold neutron brilliance exists in lowering the temperature of the moderating material even below 20 K, a commonly used minimum temperature for solid cryogenic moderator materials. At temperatures below 20 K and corresponding energies, energy transfer mostly takes place by excitations of vibrational and rotational movements of the lattice molecules. Therefore, an effective cryogenic moderator has to allow sufficient low-energy modes. Solid methane shows a phase change below approximately 21 K from phase I to phase II, which leads to a change of free molecular rotations to three-fourths of hindered rotations. Due to energy transfer by inducing librational movements of the hindered molecules even down to low temperatures, methane in phase II is one of the most effective candidates for increasing the cold neutron brilliance. Simulations on different methane thicknesses and geometries were performed to find an effective way of dimensioning the phase II methane moderator to maximize cold neutron brightness while keeping the moderator vessel as compact as possible. Using a reentrant hole for extracting cold neutrons from the center of the moderator volume, as suggested in literature, didn’t prove profitable. A preliminary design for a new cryogenic system for using solid methane at an HBS prototype is currently being carried out. Besides different measures to keep the heat load onto the cold moderator as low as possible, one also has to examine possible dangers in using solid methane being irradiated for extended periods of time while at the same time keeping those periods of time as long as possible.
000877651 536__ $$0G:(DE-HGF)POF3-144$$a144 - Controlling Collective States (POF3-144)$$cPOF3-144$$fPOF III$$x0
000877651 536__ $$0G:(DE-HGF)POF3-524$$a524 - Controlling Collective States (POF3-524)$$cPOF3-524$$fPOF III$$x1
000877651 536__ $$0G:(DE-HGF)POF3-6212$$a6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621)$$cPOF3-621$$fPOF III$$x2
000877651 536__ $$0G:(DE-HGF)POF3-6213$$a6213 - Materials and Processes for Energy and Transport Technologies (POF3-621)$$cPOF3-621$$fPOF III$$x3
000877651 536__ $$0G:(DE-HGF)POF3-6G4$$a6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)$$cPOF3-623$$fPOF III$$x4
000877651 7001_ $$0P:(DE-Juel1)169802$$aBaggemann, Johannes$$b1$$ufzj
000877651 7001_ $$0P:(DE-Juel1)131055$$aZakalek, P.$$b2$$ufzj
000877651 7001_ $$0P:(DE-Juel1)130928$$aRücker, U.$$b3$$ufzj
000877651 7001_ $$0P:(DE-Juel1)7897$$aLi, Jingjing$$b4$$ufzj
000877651 7001_ $$0P:(DE-Juel1)168124$$aGutberlet, T.$$b5$$ufzj
000877651 7001_ $$0P:(DE-Juel1)130572$$aBrückel, T.$$b6$$ufzj
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000877651 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)131055$$aForschungszentrum Jülich$$b2$$kFZJ
000877651 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)130928$$aForschungszentrum Jülich$$b3$$kFZJ
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000877651 9131_ $$0G:(DE-HGF)POF3-524$$1G:(DE-HGF)POF3-520$$2G:(DE-HGF)POF3-500$$3G:(DE-HGF)POF3$$4G:(DE-HGF)POF$$aDE-HGF$$bKey Technologies$$lFuture Information Technology - Fundamentals, Novel Concepts and Energy Efficiency (FIT)$$vControlling Collective States$$x1
000877651 9131_ $$0G:(DE-HGF)POF3-621$$1G:(DE-HGF)POF3-620$$2G:(DE-HGF)POF3-600$$3G:(DE-HGF)POF3$$4G:(DE-HGF)POF$$9G:(DE-HGF)POF3-6212$$aDE-HGF$$bForschungsbereich Materie$$lVon Materie zu Materialien und Leben$$vIn-house research on the structure, dynamics and function of matter$$x2
000877651 9131_ $$0G:(DE-HGF)POF3-621$$1G:(DE-HGF)POF3-620$$2G:(DE-HGF)POF3-600$$3G:(DE-HGF)POF3$$4G:(DE-HGF)POF$$9G:(DE-HGF)POF3-6213$$aDE-HGF$$bForschungsbereich Materie$$lVon Materie zu Materialien und Leben$$vIn-house research on the structure, dynamics and function of matter$$x3
000877651 9131_ $$0G:(DE-HGF)POF3-623$$1G:(DE-HGF)POF3-620$$2G:(DE-HGF)POF3-600$$3G:(DE-HGF)POF3$$4G:(DE-HGF)POF$$9G:(DE-HGF)POF3-6G4$$aDE-HGF$$bForschungsbereich Materie$$lVon Materie zu Materialien und Leben$$vFacility topic: Neutrons for Research on Condensed Matter$$x4
000877651 9141_ $$y2020
000877651 9201_ $$0I:(DE-Juel1)JCNS-2-20110106$$kJCNS-2$$lStreumethoden$$x0
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000877651 9201_ $$0I:(DE-82)080009_20140620$$kJARA-FIT$$lJARA-FIT$$x2
000877651 9201_ $$0I:(DE-Juel1)JCNS-HBS-20180709$$kJCNS-HBS$$lHigh Brilliance Source$$x3
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