EP1468427A1 - Neutronenoptische bauelementanordnung zur gezielten spektralen gestaltung von neutronenstrahlen oder -pulsen - Google Patents
Neutronenoptische bauelementanordnung zur gezielten spektralen gestaltung von neutronenstrahlen oder -pulsenInfo
- Publication number
- EP1468427A1 EP1468427A1 EP03731659A EP03731659A EP1468427A1 EP 1468427 A1 EP1468427 A1 EP 1468427A1 EP 03731659 A EP03731659 A EP 03731659A EP 03731659 A EP03731659 A EP 03731659A EP 1468427 A1 EP1468427 A1 EP 1468427A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- neutron
- optical component
- moderators
- neutrons
- superimposed
- 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
Links
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—HANDLING OF 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
- G21K1/06—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diffraction, refraction or reflection, e.g. monochromators
Definitions
- the invention relates to a neutron-optical component arrangement for the targeted spectral design of neutron beams or pulses in a neutron guide or a beam tube between a fast neutron source with a plurality of moderators arranged in close proximity to one another and of different embodiments for generating slow neutrons of different energy spectra and for their emission in predetermined radiation directions and at least one experiment station.
- Neutron beams serve a wide range of scientific studies ranging from pure basic research to application-oriented studies in the field of matter structure research.
- neutrons act as probes that penetrate matter.
- Neutrons striking atoms of structured matter are either scattered in a manner characteristic of the atoms or absorbed by the atoms by emitting characteristic radiation.
- Intense neutron radiation from fast neutrons is mainly generated either with a constant flow in research reactors by splitting enriched uranium or in pulsed form in spallation sources by crushing heavy atomic nuclei.
- moderators who are brought into contact with the fast neutron radiation.
- moderators are Accumulations of matter in gaseous, liquid or solid form with special properties at a given temperature.
- the interaction of the fast neutrons with the lightest possible atoms of the moderator matter decelerates the high-energy neutrons until their energies and wavelengths have the values suitable for the experiments on condensed matter.
- a neutron gas with a kinetic energy distribution is generated, which can be approximated by a Maxwell velocity distribution at a given temperature. It is a theoretically derived function that assigns the relative frequencies to the velocities of the atoms in a gas.
- the effective temperature of Maxwell's spectrum of the neutron gas is slightly higher than the temperature of the moderator material.
- neutron reflectors such as (heavy) water, lead, beryllium, graphite etc.
- reflectors which mainly serve to increase the neutron flow, also contribute to the neutron deceleration, so that they can also be classified as neutron optical components in the moderator group.
- premoderators such as water or all other structures of a neutron source are included in the group of moderators that can emit slow neutrons at all.
- slow neutrons refer to neutrons with a kinetic energy in the range of 1 eV and less.
- Hot neutrons with higher speed and lower wavelength have an energy in a range above 100 meV and are particularly suitable for scattering experiments on liquids suitable.
- Thermal neutrons have a kinetic energy in the range between 10 meV and 100 meV and the cold neutrons have kinetic energies in a range between 0.1 meV and 10 meV.
- Moderators exist in the different types of training. A distinction is made between hot, thermal and cold moderators according to the type of slow neutrons they generate. An overview of possible moderator structures in a spallation source can be found in Article I by D. Filges et al. "Particie transport
- Target - Moderator - Reflector System "(available on the Internet at http://www.hmi.de/zonen/SF/ess/ESS_moderators3.pdf, as of January 18, 2002).
- Examples are the liquid hydrogen moderator with an operating temperature in the Range of 25 K for the generation of cold neutrons and the water moderator with the ambient temperature as the operating temperature for the generation of thermal neutrons.
- a cold moderator also generates thermal and hot and a thermal moderator also cold and hot neutrons, but always with at least one Order of magnitude smaller flow than the moderator, which mainly serves to generate cold, thermal or hot neutrons.
- Watanabe "5.3 - Material Issues for Spallation Target by GeV Proton Irradiation" (available from the Internet at http://wwwndc.tokai.jaeri.go.jp/nds/proceedings /1998/watanabe_n.pdf, as of January 18, 2002)
- a target moderator configuration for carrying out high-intensity and high-resolution experiments with cold neutrons is described, in which a coupled cold moderator with pre-modulator and two thermal moderators are closely adjacent in the region's highest and the fastest neutron radiation are arranged on the target (cf.
- the means for realizing the invention should be simple in structure and manageable and thus relatively inconsequential and inexpensive. Existing security aspects should be taken into account, additional risks should be avoided.
- the solution to this is that the radiation directions of the moderators are superimposed directly or by further neutron-optical components in the neutron guide or in the experiment station and the slow neutrons generated by the moderators different energy spectra in a superimposed neutron beam with a multi spectrum, which is determined by the embodiment and the number of moderators used, are recorded together.
- the energy spectra of different moderators are combined with one another to form a “multispectrum”.
- a neutron beam (or also neutron pulse - this alternative should always be included when using the term “neutron beam”) with such a multispectrum is particularly versatile usable. Since it has a larger energy spectrum than the neutron beams generated by only one moderator, the superimposed neutron beam according to the invention also enables neutron experiments to be carried out with high efficiency in a wide energy range of the incident neutrons, for example between 0.1 meV and 100 meV.
- the composition of the multispectrum of the superimposed neutron beam depends on the type and number of moderators used.
- a cold and a thermal or a cold, a thermal and a hot moderator can be combined in their direction of propagation.
- different embodiments of a moderator type can be combined in their emission in order to achieve a particularly broad or specially designed multispectrum.
- the combination of different modem gates is only subject to constructive limits here, since it is still technically feasible to combine the radiation directions in terms of apparatus.
- other neutron-optical components in the neutron system as well as parts of the neutron source itself with other main functions that have a braking effect on the neutrons, such as reflectors, neutron guides and primary moderators, are emitted into the composition of the multispectrum Radiation can be specifically included in the common neutron beam.
- the individual neutron beams of the moderators used can be superimposed on a common neutron beam both in the neutron guide and at the experiment site.
- a superimposed neutron beam is generated, which, like a single neutron beam, is also guided in a neutron guide to the experiment site and the sample.
- the different neutron beams are focused on the sample to be examined, so that the superimposed neutron beam occurs directly in the sample.
- the advantage of this superimposed radiation at the experiment station itself can be seen in the relatively low technical complexity for combining the radiation directions of the individual moderators.
- the neighboring moderators are to be aligned at such angles to one another that there is an intersection of the radiation directions in the sample or shortly before.
- the radiation directions can be determined in the experiment station by means of a predetermined coding scheme.
- the different radiation directions can be determined in the experiment station by means of a predetermined coding scheme.
- the neutron guide itself which according to an embodiment of the invention can be coated with nickel on its inner surface (cf.
- a further neutron-optical component is designed as an oscillating mirror, which is synchronous with a pulsed neutron source or with the chopped neutron beam a continuous neutron source oscillates. Through the oscillating mirror the neutron beams from different moderators are alternately superimposed on the superimposed neutron beam with the effective, central beam direction.
- the mirror oscillates back and forth between a cold and a thermal moderator in time with a neutron pulse source and if it has the right angle for the cold neutrons that hit it, it first reflects the cold neutron pulse in the central beam direction. Then the mirror angle is adjusted in the pulse cycle, so that the thermal neutrons hit and the thermal neutron pulse is injected. The other neutron pulse is deflected outside the central beam direction.
- mechanical or other chopper arrangements can be used to chop the continuous neutron beam into individual pulses.
- the measurements on the sample are to be carried out in time with the neutron pulses or in the oscillator cycle.
- a neutron-optical component that has an energy-selective switching function.
- Such components can be designed and aligned in such a way that, for example, they let the central energy area of each moderator with the largest number of neutrons to be generated and into the Coupling in effective, medium beam direction, whereas they block the edge areas with the energetically deviating neutrons.
- the switching function enables the multispectrum of the superimposed neutron beam to be put together by allowing only the corresponding neutrons from the moderators producing them to be transmitted for the individual neutron types.
- a maximum neutron flux for the experiments can be achieved for both cold and thermal and hot neutrons.
- Neutron optical components with an energy-selective switching function can primarily be implemented using special neutron mirrors. Therefore, according to a further embodiment of the invention, it is provided that the further neutron-optical component with an energy-dependent switching function is designed as a neutron mirror, which transmits or reflects neutrons that are incident continuously or in a graduated manner by a corresponding angular orientation depending on their energy.
- the neutron mirrors transmits or reflects neutrons that are incident continuously or in a graduated manner by a corresponding angular orientation depending on their energy.
- the neutron mirrors are designed in a self-supporting form or on a neutron-transparent substrate as a single-layer or multi-layer neutron mirror, the coating being applied to one or both sides of the substrate.
- the multilayer neutron mirrors are so-called “super mirrors” with interfering properties (cf. DE 198 44 300 A1). Silicon or sapphire, for example, are suitable as substrates. All of these neutron-optical components are relatively simple in structure and therefore compared to A particularly favorable and compact embodiment of the invention results if, according to another invention continuation, the further neutron optical components with an energy-dependent switching function in the Neutron guides are integrated. In this embodiment too, reference is made to the specific description part in order to avoid repetitions.
- FIG. 1 shows a neutron-optical component arrangement according to the invention for generating a multi-spectrum
- FIG. 2 shows the switching function generated with the arrangement according to FIG. 1 for generating the multi-spectrum.
- FIG. 1 shows a neutron-optical component arrangement NOA according to the invention for the targeted spectral design of neutron beams or pulses.
- a cold moderator CNM for neutrons is arranged closely adjacent to a thermal moderator TNM for neutrons.
- Both moderators CNM, TNM have a cross section of 12 cm x 12 cm and are adjacent to each other with a gap of 0.5 cm.
- their radiation directions CBL, TBL are indicated at an angle to one another.
- the cold moderator CNM emits a neutron spectrum with a maximum for the cold neutrons CCN and a lower proportion for the thermal neutrons TCN.
- the thermal moderator TNM generates a maximum for the thermal neutrons TTN and a smaller number of cold neutrons CTN.
- the thermal moderator TNM is arranged directly opposite a neutron guide NGT, which forwards the coupled neutrons to an experimental station (not shown in FIG. 1).
- the neutron guide NGT has a cross section of 6 cm x 10 cm and extends from that in the neutron source not shown in Figure 1 at a distance of 32 m. It is coated with nickel to improve its reflective properties on the inner surface INS.
- TTN By multiple flat reflection of the flat neutron beams CCN, TTN, he concentrates them in an effective, central beam direction EBL to form a superimposed neutron beam SBL with a multi-spectrum.
- the neutrons all hit the sample to be analyzed from one direction, so to speak.
- the superimposed neutron beam SBL generated in the neutron guide NGT by beam superimposition has a particularly high-quality multispectrum, which is composed only of the maximum ranges of the spectra of the two moderators CNM, TNM.
- the neutron guide NGT has at its end facing the two moderators CNM, TNM at a distance of 1.5 m from these other neutron-optical components NOC an energy-dependent switching function integrated.
- this is a simple neutron-conducting super mirror RSM and a further super mirror SSM opposite this.
- the SSM super mirror is applied to a neutron-transparent Si substrate with a thickness of 0.75 mm. While the super mirror RSM is used for the pure reflection of neutron beams emigrating, the opposite super mirror has SSM an energy and angle dependent switching function.
- the super mirror SSM is constructed and its angle (here, for example, 0.72 °) is set such that it reflects the cold neutrons CCN of the cold moderator CNM into the neutron guides NGT, whereas the cold neutrons CTN of the thermal moderator TNM are reflected from the other side of the mirror away from the area of the neutron guide NGT.
- the thermal neutrons TCN of the cold moderator CNM are guided out of the neutron guide NGT along the super mirror SSM, whereas the thermal neutrons TTN of the thermal moderator TNM can pass through the super mirror SSM unhindered.
- the superimposed neutron beam SBL is composed of preferentially emitted neutrons from the two moderators CNM, TNM. This ensures, on the one hand, that each neutron energy is switched to the moderator with the higher neutron flux and, on the other hand, the other moderator with the possibly less favorable beam quality - for example pulse shape with pulsed sources - is hidden.
- FIG. 2 shows the switching function for generating the multispectrum of the arrangement according to the invention in the exemplary embodiment selected according to FIG. 1.
- the relative transmission coefficient RTC of the entire neutron optical system is shown as a function of the neutron wavelength NWL in nm for both moderators CNM, TNM according to FIG. 1, which can be defined in comparison to the simple spectra in an identical neutron guide, which is 1.5 m Removal is arranged either before the cold or before the thermal moderator CNM, TNM.
- neutron energies of more than 20 meV corresponding to a neutron speed above 2000 m / s or equivalent to a neutron wavelength below 0.2 nm
- thermal neutrons TTN from the thermal moderator TNM are available in the combined multispectrum.
- Neutron energies of less than 5 meV this corresponds to a neutron speed of less than 1000 m / s or a neutron wavelength of more than 0.4 nm
- the neutrons TTN, CCN from both moderators TNM, CNM in a mixed form with different proportions in the superimposed neutron beam SBL are fed to the experiment.
- TNM thermal moderator for neutrons TTN thermal neutrons thermal moderator
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Particle Accelerators (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10203591A DE10203591B4 (de) | 2002-01-23 | 2002-01-23 | Neutronenoptische Bauelementanordnung zur gezielten spektralen Gestaltung von Neutronenstrahlen oder -pulsen |
| DE10203591 | 2002-01-23 | ||
| PCT/DE2003/000192 WO2003063183A1 (de) | 2002-01-23 | 2003-01-22 | Neutronenoptische bauelementanordnung zur gezielten spektralen gestaltung von neutronenstrahlen oder -pulsen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1468427A1 true EP1468427A1 (de) | 2004-10-20 |
| EP1468427B1 EP1468427B1 (de) | 2012-01-04 |
Family
ID=7713395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03731659A Expired - Lifetime EP1468427B1 (de) | 2002-01-23 | 2003-01-22 | Neutronenoptische bauelementanordnung zur gezielten spektralen gestaltung von neutronenstrahlen oder -pulsen |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US7030397B2 (de) |
| EP (1) | EP1468427B1 (de) |
| JP (1) | JP4426305B2 (de) |
| AT (1) | ATE540411T1 (de) |
| DE (1) | DE10203591B4 (de) |
| WO (1) | WO2003063183A1 (de) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7504619B2 (en) * | 2002-05-20 | 2009-03-17 | The University Of Houston System | Energetic neutral particle lithographic apparatus and process |
| DE102004031934B4 (de) | 2004-06-27 | 2006-11-09 | Hahn-Meitner-Institut Berlin Gmbh | Strahlungsoptisches Bauelement |
| JP5105342B2 (ja) * | 2006-05-10 | 2012-12-26 | 独立行政法人日本原子力研究開発機構 | パルス中性子非弾性散乱実験の高効率測定方法 |
| KR100825914B1 (ko) * | 2006-11-17 | 2008-04-28 | 한국원자력연구원 | 중성자 단색기 구조를 이용한 중성자 초거울 제작방법 |
| DE102008052410B4 (de) | 2008-10-21 | 2010-10-07 | Helmholtz-Zentrum Berlin Für Materialien Und Energie Gmbh | Strahlungsoptisches Bauelement zur Beeinflussung von Strahlung in Bezug auf deren Wellenlängenspektrum |
| JP5320592B2 (ja) * | 2009-03-18 | 2013-10-23 | 大学共同利用機関法人 高エネルギー加速器研究機構 | 中性子線の単色集光装置 |
| JP2011053096A (ja) * | 2009-09-02 | 2011-03-17 | Japan Atomic Energy Agency | 中性子光学素子 |
| DE102011121740B3 (de) * | 2011-12-21 | 2012-12-27 | Helmholtz-Zentrum Berlin Für Materialien Und Energie Gmbh | Anordnung zur Erzeugung kalter Neutronen |
| DE102014013082A1 (de) * | 2014-09-09 | 2016-03-10 | Forschungszentrum Jülich GmbH | Anordnung für polarisierte Neutronenstrahlen und Verfahren zur Polarisationsanalyse |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU713292A1 (ru) * | 1978-08-15 | 1983-09-15 | Предприятие П/Я В-2679 | Нейтронный спектрометр |
| SU1091096A1 (ru) * | 1983-01-06 | 1984-05-07 | Объединенный Институт Ядерных Исследований | Способ измерени среднего значени напр женности магнитного пол |
| US5920601A (en) * | 1996-10-25 | 1999-07-06 | Lockheed Martin Idaho Technologies Company | System and method for delivery of neutron beams for medical therapy |
| DE29716107U1 (de) * | 1997-09-08 | 1997-10-30 | Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V., 80539 München | Strahlführungssystem für Neutronen zur Grenzflächenuntersuchung |
| DE19844300C2 (de) * | 1998-09-17 | 2002-07-18 | Hahn Meitner Inst Berlin Gmbh | Neutronenoptisches Bauelement |
| US5949840A (en) * | 1998-11-25 | 1999-09-07 | The Regents Of The University Of California | Neutron guide |
| JP3048569B1 (ja) * | 1999-03-08 | 2000-06-05 | 理化学研究所 | 中性子ビ―ム制御装置及び中性子エネルギ―測定装置 |
| FR2811857B1 (fr) * | 2000-07-11 | 2003-01-17 | Commissariat Energie Atomique | Dispositif de spallation pour la production de neutrons |
-
2002
- 2002-01-23 DE DE10203591A patent/DE10203591B4/de not_active Expired - Fee Related
-
2003
- 2003-01-22 US US10/502,372 patent/US7030397B2/en not_active Expired - Fee Related
- 2003-01-22 JP JP2003562952A patent/JP4426305B2/ja not_active Expired - Fee Related
- 2003-01-22 WO PCT/DE2003/000192 patent/WO2003063183A1/de not_active Ceased
- 2003-01-22 EP EP03731659A patent/EP1468427B1/de not_active Expired - Lifetime
- 2003-01-22 AT AT03731659T patent/ATE540411T1/de active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO03063183A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10203591B4 (de) | 2008-09-18 |
| EP1468427B1 (de) | 2012-01-04 |
| JP4426305B2 (ja) | 2010-03-03 |
| DE10203591A1 (de) | 2003-08-07 |
| WO2003063183A1 (de) | 2003-07-31 |
| ATE540411T1 (de) | 2012-01-15 |
| JP2005516195A (ja) | 2005-06-02 |
| US20050157831A1 (en) | 2005-07-21 |
| US7030397B2 (en) | 2006-04-18 |
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