EP1151440A2 - Selecteur de vitesse utilise pour rendre un rayonnement neutronique monochrome - Google Patents

Selecteur de vitesse utilise pour rendre un rayonnement neutronique monochrome

Info

Publication number
EP1151440A2
EP1151440A2 EP00908947A EP00908947A EP1151440A2 EP 1151440 A2 EP1151440 A2 EP 1151440A2 EP 00908947 A EP00908947 A EP 00908947A EP 00908947 A EP00908947 A EP 00908947A EP 1151440 A2 EP1151440 A2 EP 1151440A2
Authority
EP
European Patent Office
Prior art keywords
alloy
neutrons
rotor
webs
speed selector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00908947A
Other languages
German (de)
English (en)
Other versions
EP1151440B1 (fr
Inventor
Berthold Alefeld
Ludwig Dohmen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Forschungszentrum Juelich GmbH
Original Assignee
Forschungszentrum Juelich GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Forschungszentrum Juelich GmbH filed Critical Forschungszentrum Juelich GmbH
Publication of EP1151440A2 publication Critical patent/EP1151440A2/fr
Application granted granted Critical
Publication of EP1151440B1 publication Critical patent/EP1151440B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H3/00—Production or acceleration of neutral particle beams, e.g. molecular or atomic beams
    • H05H3/06—Generating neutron beams
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
    • G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
    • G21K1/04—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using variable diaphragms, shutters, choppers
    • G21K1/043—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using variable diaphragms, shutters, choppers changing time structure of beams by mechanical means, e.g. choppers, spinning filter wheels

Definitions

  • the present invention relates to a speed selector for monochromatizing a neutron beam with a drive unit which has a horizontally lying shaft, and with a rotor mounted on the shaft, on the longitudinal axis of which twisted webs are arranged at a distance from one another and form through slots for neutrons.
  • Such a speed selector is e.g. B. from "Neutron Velocity Selectors for Large Research”; Hugo Betzold, Karl R. Schulz; Special print from Dornierpost 1/89, Dornier GmbH, known.
  • a mechanical speed selector for monochromatizing a neutron beam is often used in neutron scattering.
  • the speed selector consists of a rapidly rotating rotor that runs in a vacuum and has slots or webs drilled on the long side. When standing, no neutrons can fly through the slots, since they always hit a web.
  • the wall thickness and material of these webs or lamellas should be such that the neutrons are considerably weakened, that is, with a transmission of at least 10 "5. If the rotor now rotates at a certain speed, depending on the twist angle neutrons are transmitted at a certain speed
  • the bandwidth (resolution) depends on the slot width and length of the rotor.
  • the speed selector known from the abovementioned prior art has a rotor which, or its webs, consists of carbon fiber in epoxy and whose surface is coated with an absorber material, namely boron 10 or gadolinium. It is also known to manufacture the rotor from solid aluminum material and to coat the fins with a corresponding absorbent material.
  • the object of the present invention is therefore to provide a speed selector for monochromatizing a neutron beam which is simple to produce and in which a coating can be dispensed with.
  • the object is achieved in that the webs consist of an alloy that absorbs neutrons.
  • the alloy contains the absorbent isotope Li.
  • the properties of the absorbing isotope Li 6 have proven to be particularly suitable for the absorption of neutrons.
  • the Li 6 isotope can also be suitably enriched in order to adjust the absorbent properties.
  • the alloy is a Mg-Li alloy.
  • Mg-Li alloys are known from aircraft construction and can be obtained inexpensively.
  • the drive unit is a turbomolecular pump.
  • Turbomolecular pumps are available on the market and can be easily adapted for use with a mechanical speed selector. Turbomolecular pumps are also available on the market at very reasonable prices.
  • Another advantage according to claim 7 is that the drive unit covers a speed range of up to a maximum of 60,000 rpm. State of the art speed selectors are in a speed range of only 2,000 to 28,300 rpm.
  • the principle of a rotor 1 is clear from the figure.
  • the rotor 1 rotates about an axis 3 of a shaft 5 lying horizontally in the direction of the arrow shown.
  • Radial webs or lamellae 7 are arranged on the shaft 5, which are oriented obliquely to the longitudinal axis 3 and twisted. Slits 9 are thus formed between the webs 7 as passageways for neutrons.
  • neutrons are sent from the left in the direction of the webs 7 (see arrows) and move through the slots 9.
  • the neutrons strike the wall of the webs 7, since these are oriented obliquely to the longitudinal axis and to the path of movement of the neutrons.
  • the slots 9 become passable through-slots for selected neutrons.
  • Neutrons which due to their properties do not belong to the selected neutrons passing through the slits 9, are absorbed on the walls of the webs 7.
  • the webs 7 and possibly also the rotor 1 as a whole are formed from a solid material that absorbs neutrons.
  • the webs 7 or the entire rotor 1 are made of an absorbent alloy with an absorbent isotope Li.
  • the webs 7 or the rotor 1 preferably consist of a Mg-Li alloy, wherein the absorbing Li 6 isotope can be enriched if necessary.
  • the alloy can also be another Li alloy, e.g. B. an Al-Li alloy.
  • the rotor 1 reaches a maximum speed of 60,000 rpm. This is e.g. B. achieved by using a drive unit (not shown) of a turbomolecular pump.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Positive Displacement Air Blowers (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Particle Accelerators (AREA)
  • Powder Metallurgy (AREA)
  • Measurement Of Radiation (AREA)
EP00908947A 1999-02-04 2000-01-28 Selecteur de vitesse utilise pour rendre un rayonnement neutronique monochrome Expired - Lifetime EP1151440B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19904562 1999-02-04
DE19904562A DE19904562C2 (de) 1999-02-04 1999-02-04 Geschwindigkeitsselektor zur Monochromatisierung eines Neutronenstrahls
PCT/DE2000/000239 WO2000046812A2 (fr) 1999-02-04 2000-01-28 Selecteur de vitesse utilise pour rendre un rayonnement neutronique monochrome

Publications (2)

Publication Number Publication Date
EP1151440A2 true EP1151440A2 (fr) 2001-11-07
EP1151440B1 EP1151440B1 (fr) 2008-04-23

Family

ID=7896450

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00908947A Expired - Lifetime EP1151440B1 (fr) 1999-02-04 2000-01-28 Selecteur de vitesse utilise pour rendre un rayonnement neutronique monochrome

Country Status (4)

Country Link
EP (1) EP1151440B1 (fr)
AT (1) ATE393455T1 (fr)
DE (2) DE19904562C2 (fr)
WO (1) WO2000046812A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2005321803B2 (en) 2004-12-29 2012-02-09 Emisphere Technologies, Inc. Pharmaceutical formulations of gallium salts
EP2040718B1 (fr) 2006-06-28 2017-12-27 Emisphere Technologies, Inc. Formulations de nitrate de gallium
EP2461803B1 (fr) 2009-08-03 2018-10-17 Emisphere Technologies, Inc. Composition de naproxène à action rapide avec effets gastro-intestinaux réduits
RU2745587C1 (ru) * 2020-07-20 2021-03-29 Объединенный Институт Ядерных Исследований (Оияи) Механический фильтр нейтронного пучка с временной фокусировкой

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2116261A1 (en) * 1971-04-02 1972-10-12 Battelle Institut E V Magnesium-lithium alloys - contg hydrogen as shields against fast neutrons
US4123392A (en) * 1972-04-13 1978-10-31 Chemtree Corporation Non-combustible nuclear radiation shields with high hydrogen content
US4463266A (en) * 1981-02-20 1984-07-31 Instrument Ab Scanditronix Neutron collimator
DE3432775A1 (de) * 1984-09-06 1986-03-20 Kernforschungsanlage Jülich GmbH, 5170 Jülich Antrieb fuer Neutronenchopper
JPH07110397A (ja) * 1993-10-13 1995-04-25 Seiko Seiki Co Ltd 中性子ベロシティセレクタ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0046812A2 *

Also Published As

Publication number Publication date
WO2000046812A2 (fr) 2000-08-10
DE50015124D1 (de) 2008-06-05
DE19904562A1 (de) 2000-08-17
ATE393455T1 (de) 2008-05-15
EP1151440B1 (fr) 2008-04-23
WO2000046812A3 (fr) 2000-12-07
DE19904562C2 (de) 2002-06-13

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