EP1151440A2 - Velocity selector for the monochromatization of a neutron beam - Google Patents

Velocity selector for the monochromatization of a neutron beam

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)
French (fr)
Other versions
EP1151440B1 (en
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/en
Application granted granted Critical
Publication of EP1151440B1 publication Critical patent/EP1151440B1/en
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)
  • Powder Metallurgy (AREA)
  • Measurement Of Radiation (AREA)
  • Particle Accelerators (AREA)

Abstract

The invention relates to a velocity selector comprising a drive unit which has a horizontally disposed shaft. The velocity selector also comprises a rotor which is mounted on said shaft. Twisted fins are arranged in an interspaced manner on the longitudinal axis of said rotor and form through slots for neutrons. The inventive velocity selector is characterized in that the fins are comprised of an alloy which absorbs neutrons, especially of an Mg-Li alloy.

Description

Geschwindigkeitsselektor zur Monochromatisierung eines Neutronenstrahls Speed selector for monochromatizing a neutron beam
Die vorliegende Erfindung betrifft einen Geschwindigkeitsselektor zur Monochromatisierung eines Neutronenstrahls mit einer Antriebseinheit, die eine horizontal liegende Welle aufweist, und mit einem auf der Welle angebrachten Rotor, an dessen Längsachse verdrillte Stege in Abstand zueinander angeordnet sind und Durchgangsschlitze für Neutronen bilden.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.
Ein solcher Geschwindigkeitsselektor ist z. B. aus "Neutronen-Geschwindigkeits- selektoren für die Großforschung"; Hugo Betzold, Karl R. Schulz; Sonderdruck aus Dornierpost 1/89, der Dornier GmbH, bekannt.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.
In der Neutronenstreuung wird häufig ein mechanischer Geschwindigkeitsselektor zur Monochromatisierung eines Neutronenstrahls eingesetzt. Der Geschwindigkeitsselektor be- steht aus einem im Vakuum laufenden schnell drehenden Rotor, der an der Längsseite gedrillte Schlitze oder Stege besitzt. Im stehenden Zustand können durch die Schlitze keine Neutronen hindurchfliegen, da sie immer auf einen Steg auftreffen. Diese Stege oder Lamellen sollten von der Wanddicke und vom Material so beschaffen sein, daß die Neutronen erheblich, das heißt, mit einer Transmission von mindestens 10"5, geschwächt werden. Wenn der Rotor nun mit einer bestimmten Drehzahl dreht, werden je nach Verdrillungs- winkel Neutronen mit einer bestimmten Geschwindigkeit hindurchgelassen. Die Bandbreite (Auflösung) ist von der Schlitzbreite und Länge des Rotors abhängig.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.
Der aus dem vorgenannten Stand der Technik bekannte Geschwindigkeitsselektor weist einen Rotor auf, der bzw. dessen Stege aus Kohlefaser in Epoxy besteht und dessen Oberfläche mit einem Absorbermaterial, nämlich Bor 10 oder Gadolinium beschichtet ist. Es ist auch bekannt, den Rotor aus Aluminium- Vollmaterial zu fertigen und die Lamellen mit einem entsprechenden absorbierenden Material zu beschichten.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.
Durch die Beschichtung des Rotors bzw. dessen Stege mit einem absorbierenden Material, wird die Fertigung relativ kompliziert und teuer. Auch Fehler in der Beschichtung führen zu einem relativ großen Ausschuß. Auch die Antriebseinheiten eines aus dem vorgenann- ten Standes der Technik bekannten Geschwindigkeitsselektor werden speziell für den Verwendungszweck gebaut und somit teuer.By coating the rotor or its webs with an absorbent material, the production becomes relatively complicated and expensive. Defects in the coating also lead to a relatively large scrap. Even the drive units from the Speed selector known in the prior art are built specifically for the intended use and are therefore expensive.
Die Aufgabe der vorliegenden Erfindung ist daher, einen Geschwindigkeitsselektor zur Monochromatisierung eines Neutronenstrahls zu schaffen, der in einfacher Weise herzustellen ist und in welchem auf eine Beschichtung verzichtet werden kann. Die Aufgabe wird dadurch gelöst, daß die Stege aus einer Legierung bestehen, die Neutronen absorbiert.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.
Durch die Fertigung des Rotors und seiner Stege mittels einer Legierung, die gegenüber Neutronen eine absorbierende Wirkung aufweist, entfallt die Notwendigkeit, auf den entsprechenden Bauteilen eine Beschichtung mit entsprechend absorbierender Wirkung aufzubringen.By manufacturing the rotor and its webs using an alloy that has an absorbing effect against neutrons, there is no need to apply a coating with a corresponding absorbing effect to the corresponding components.
Gemäß Anspruch 2 ist es von Vorteil, daß nicht nur die Stege oder Lamellen aus einer Le- gierung mit absorbierender Wirkung gegen Neutronen besteht, sondern der ganze Rotor. Dadurch wird die Fertigung weiter vereinfacht.According to claim 2, it is advantageous that not only the webs or lamellae consist of an alloy with an absorbing effect against neutrons, but the entire rotor. This further simplifies production.
Ein weiterer Vorteil gemäß Anspruch 3 besteht darin, daß die Legierung das absorbierende Isotop Li enthält. Die Eigenschaften des absorbierenden Isotops Li6 haben sich für die Absorbierung von Neutronen als besonders geeignet erwiesen.Another advantage according to claim 3 is that 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.
Gemäß Anspruch 4 kann das Isotop Li6 auch in geeigneter Weise angereichert sein, um die absorbierenden Eigenschaften einzustellen.According to claim 4, the Li 6 isotope can also be suitably enriched in order to adjust the absorbent properties.
Gemäß Anspruch 5 ist es von Vorteil, daß die Legierung eine Mg-Li-Legierung ist. Solche Mg-Li-Legierungen sind aus dem Flugzeugbau bekannt und können preiswert bezogen werden.According to claim 5, it is advantageous that the alloy is a Mg-Li alloy. Such Mg-Li alloys are known from aircraft construction and can be obtained inexpensively.
Gemäß Anspruch 6 ist es von Vorteil, daß die Antriebseinheit eine Turbomolekularpumpe ist. Turbomolekulaφumpen sind auf dem Markt erhältlich und können für die Verwendung eines mechanischen Geschwindigkeitsselektors leicht angepaßt werden. Auch Turbomolekularpumpen sind auf dem Markt sehr preiswert erhältlich. Ein weiterer Vorteil gemäß Anspruch 7 besteht darin, daß die Antriebseinheit einen Drehzahlbereich von bis maximal 60.000 U/min abdeckt. Geschwindigkeitsselektoren des Standes der Technik liegen in einem Drehzahlbereich von nur 2.000 bis 28.300 U/min.According to claim 6, it is advantageous that 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.
Eine Ausführungsform eines Neutronengeschwindigkeitsselektors ist in der einzigen Figur schematisch dargestellt.An embodiment of a neutron velocity selector is shown schematically in the single figure.
Aus der Figur wird das Prinzip eines Rotors 1 deutlich. Der Rotor 1 dreht sich um eine Achse 3 einer horitzontal liegenden Welle 5 in Richtung des dargestellten Pfeiles. Auf der Welle 5 sind radiale Stege oder Lamellen 7 angeordnet, die schräg zur Längsachse 3 und verdrillt ausgerichtet sind. Zwischen den Stegen 7 sind somit Schlitze 9 als Durchgangswege für Neutronen ausgebildet. Neutronen werden in der Figur von der linken Seite in Richtung auf die Stege 7 geschickt (siehe Pfeile) und bewegen sich durch die Schlitze 9 hindurch. Bei stillstehendem Rotor 1 prallen die Neutronen gegen die Wand der Stege 7, da diese schräg zur Längsachse und zur Bewegungsbahn der Neutronen ausgerichtet sind. Bei Drehung des Rotors 1 um die Längsachse 3 in der angezeigten Drehrichtung werden die Schlitze 9 für ausgewählte Neutronen allerdings zu passierbaren Durchgangsschlitzen. Neutronen, die aufgrund ihrer Eigenschaften nicht zu den ausgewählten, durch die Schlitze 9 hindurchgehenden Neutronen gehören, werden an den Wänden der Stege 7 absorbiert. Aus diesem Grunde sind die Stege 7 und ggf. auch der Rotor 1 im Ganzen aus einem für Neutronen absorbierenden Vollmaterial ausgebildet. In der vorliegenden Ausfuhrungsform stehen die Stege 7 oder der gesamte Rotor 1 aus einer absorbierenden Legierung mit einem absorbierenden Isotop Li . Vorzugsweise bestehen die Stege 7 bzw. der Rotor 1 aus einer Mg-Li-Legierung, wobei das absorbierende Li6 Isotop bedarfsweise angereichert sein kann. In einer weiteren Ausführungsform kann die Legierung auch eine andere Li-Legierung sein, z. B. eine Al-Li-Legierung.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. In the figure, neutrons are sent from the left in the direction of the webs 7 (see arrows) and move through the slots 9. When the rotor 1 is at a standstill, 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. When the rotor 1 is rotated about the longitudinal axis 3 in the indicated direction of rotation, 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. For this reason, the webs 7 and possibly also the rotor 1 as a whole are formed from a solid material that absorbs neutrons. In the present embodiment, 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. In a further embodiment, the alloy can also be another Li alloy, e.g. B. an Al-Li alloy.
Für die Selektion von Neutronen ist es günstig, wenn der Rotor 1 eine maximale Drehzahl von 60.000 U/min erreicht. Dies wird z. B. durch Verwendung einer Antriebseinheit (nicht dargestellt) einer Turbomolekularpumpe erreicht. For the selection of neutrons, it is advantageous if 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.

Claims

Patentansprüche claims
1. Geschwindigkeitsselektor mit einer Antriebseinheit, mit einer Welle und mit einem auf der Welle angebrachten Rotor, an dessen Längsachse verdrillte Stege in Abstand zueinan- der angeordnet sind und Durchgangsschlitze für Neutronen bilden, dadurch gekennzeichnet, daß die Stege (7) aus einer Legierung bestehen, die Neutronen absorbiert.1. Speed selector with a drive unit, with a shaft and with a rotor attached to the shaft, on the longitudinal axis of which twisted webs are arranged at a distance from one another and form through slots for neutrons, characterized in that the webs (7) consist of an alloy that absorbs neutrons.
2. Geschwindigkeitsselektor nach Anspruch 1, dadurch gekennzeichnet, daß der Rotor (1) aus einer Legierung besteht, die Neutronen absorbiert.2. Speed selector according to claim 1, characterized in that the rotor (1) consists of an alloy which absorbs neutrons.
3. Geschwindigkeitsselektor nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Legierung als absorbierendes Isotop Li6 enthält.3. Speed selector according to claim 1 or 2, characterized in that the alloy contains Li 6 as an absorbing isotope.
4. Geschwindigkeitsselektor nach Anspruch 3, dadurch gekennzeichnet, daß das Li6 Isotop angereichert ist.4. Speed selector according to claim 3, characterized in that the Li 6 isotope is enriched.
5. Geschwindigkeitsselektor nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Legierung eine Mg-Li-Legierung ist.5. Speed selector according to one of claims 1 to 4, characterized in that the alloy is a Mg-Li alloy.
6. Geschwindigkeitsselektor nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Antriebseinheit eine Turbomolekularpumpe ist.6. Speed selector according to one of the preceding claims, characterized in that the drive unit is a turbomolecular pump.
7. Geschwindigkeitsselektor nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Antriebseinheit eine maximale Drehzahl von 60.000 U/min aufweist. 7. Speed selector according to one of the preceding claims, characterized in that the drive unit has a maximum speed of 60,000 rpm.
EP00908947A 1999-02-04 2000-01-28 Velocity selector for the monochromatization of a neutron beam Expired - Lifetime EP1151440B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19904562 1999-02-04
DE19904562A DE19904562C2 (en) 1999-02-04 1999-02-04 Speed selector for monochromatizing a neutron beam
PCT/DE2000/000239 WO2000046812A2 (en) 1999-02-04 2000-01-28 Velocity selector for the monochromatization of a neutron beam

Publications (2)

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

Family

ID=7896450

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00908947A Expired - Lifetime EP1151440B1 (en) 1999-02-04 2000-01-28 Velocity selector for the monochromatization of a neutron beam

Country Status (4)

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

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2535311T3 (en) 2004-12-29 2015-05-08 Emisphere Technologies, Inc. Pharmaceutical formulations of gallium salts
CA2656019C (en) 2006-06-28 2016-09-13 Emisphere Technologies, Inc. Gallium nitrate formulations
EP2461803B1 (en) 2009-08-03 2018-10-17 Emisphere Technologies, Inc. Fast-acting naproxen composition with reduced gastrointestinal effects
RU2745587C1 (en) * 2020-07-20 2021-03-29 Объединенный Институт Ядерных Исследований (Оияи) Mechanical neutron beam filter with the time focus

Family Cites Families (5)

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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 (en) * 1984-09-06 1986-03-20 Kernforschungsanlage Jülich GmbH, 5170 Jülich Drive for neutron chopper
JPH07110397A (en) * 1993-10-13 1995-04-25 Seiko Seiki Co Ltd Neutron velocity selector

Non-Patent Citations (1)

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Title
See references of WO0046812A2 *

Also Published As

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

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