EP2095696A1 - Kreisbeschleuniger mit einstellbarer elektronen-endenergie - Google Patents
Kreisbeschleuniger mit einstellbarer elektronen-endenergieInfo
- Publication number
- EP2095696A1 EP2095696A1 EP07802170A EP07802170A EP2095696A1 EP 2095696 A1 EP2095696 A1 EP 2095696A1 EP 07802170 A EP07802170 A EP 07802170A EP 07802170 A EP07802170 A EP 07802170A EP 2095696 A1 EP2095696 A1 EP 2095696A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- terminal
- main field
- betatron
- coil
- expansion
- 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
- 239000003990 capacitor Substances 0.000 claims description 19
- 239000004065 semiconductor Substances 0.000 claims description 9
- 238000004146 energy storage Methods 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 6
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 2
- 230000001133 acceleration Effects 0.000 description 11
- 238000001228 spectrum Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000005461 Bremsstrahlung Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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
- H05H11/00—Magnetic induction accelerators, e.g. betatrons
Definitions
- the present invention relates to a betatron for generating pulses of accelerated electrons, in particular in an X-ray inspection system.
- X-ray inspection systems When checking large-volume items such as containers and vehicles for inadmissible content such as weapons, explosives or contraband, X-ray inspection systems are known to be used. X-rays are generated and directed to the object. The X-radiation attenuated by the object is measured by means of a detector and analyzed by an evaluation unit. Thus, it can be concluded on the nature of the object.
- Such an X-ray inspection system is known, for example, from European Patent EP 0 412 190 B1. For better differentiation of different substances, it is advantageous to examine the object successively with X-radiation of different energy.
- Betatrons are used to generate X-rays with the energy of more than 1 MeV necessary for the test.
- These are circular accelerators in which electrons are injected into an evacuated betatron tube and accelerated on a circular path by a rising magnetic field generated by a main field coil. The accelerated electrons are directed to a target, where they produce a bremsstrahlung upon impact, the spectrum of which depends, among other things, on the energy of the electrons. The acceleration of the electrons is cyclically repeated, resulting in a pulsed X-radiation.
- the electrons are injected, for example by means of an electron gun in the betatron tube and the current through the main field coil and thus increases the strength of the magnetic field. Due to the changing magnetic field is a generates an electric field that accelerates the electrons in their orbit of radius r s . At the same time, the magnetic field strength increases the Lorentz force on the electrons. This keeps the electrons at a substantially constant orbit radius. An electron moves in a circular path when the Lorentz force and the opposite centripetal force are directed towards the center of the orbit. It follows the Wideröe 'sche condition
- ⁇ ⁇ B (r s )> ⁇ B (r s ) 2 dt s dt K s J
- ⁇ B (r s )> is therefore the average magnetic flux through the circular area bounded by the radius r s , B (r s ) is the magnetic flux at this nominal orbit radius r s .
- the object of the present invention to provide a betatron for generating pulses of accelerated electrons, in which the final energy of the accelerated electrons is adjustable.
- Claim 10 relates to an X-ray examination system using a betatron according to the invention.
- An inventive betatron according to claim 1 consists of at least one main field coil, an expansion coil for discharging the accelerated electrons to a target and a control electronics of the expansion coil for acting on the expansion coil with an expansion pulse.
- the control electronics of the expansion coil is designed such that the time of the expansion pulse for adjusting the final energy of the electrons is variable relative to the main field.
- the switch-on time of the expansion Pulses in relation to the current pulse through the main field coil (s) is temporally displaceable.
- This variability of the expansion pulse makes it possible to determine exactly when the electrons are directed to the target. This determines at the same time which energy the main field has supplied to the electrons between the injection into the betatron tube and the discharge. This is equivalent to adjusting the maximum energy of the X-rays that the electrons generate when they hit the target.
- the timing of the expansion pulse is variable relative to the main field from pulse to pulse. This means that in each acceleration cycle, the final energy of the electrons is adjustable independently of the preceding acceleration cycles. This results in the advantage that in an X-ray examination apparatus with a betatron according to the invention, two measurements of an object with different radiation energies can be carried out within a short time.
- the free selectability of the time point of the expansion pulse is preferably achieved in that the drive electronics of the expansion coil has a turn-off semiconductor switch, in particular an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal Oxide Semiconductor Field Effect Transistor). Such switches are also able to turn on and / or off large currents in response to a control pulse quickly and at arbitrary times.
- a turn-off semiconductor switch in particular an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal Oxide Semiconductor Field Effect Transistor).
- IGBT Insulated Gate Bipolar Transistor
- MOSFET Metal Oxide Semiconductor Field Effect Transistor
- the expansion coil is connected via the semiconductor switch to an independent energy source such as a current or voltage source to form a circuit.
- a voltage source may also be, for example, a capacitor or a capacitor bank. If the semiconductor switch is closed, the energy source causes a current flow through the expansion coil. During this current flow, the expansion pulse, the electrons are deflected from their desired path to the target.
- independent means that the energy source is as far as possible decoupled from other energy sources, for example that for the main field coils. This results in a more stable energy supply to the expansion coil and thus a precise controllable expansion pulse.
- a betatron according to the invention has a drive circuit of the main field coil, which is configured such that the current through the main field coil can be switched on and off at arbitrary times.
- This allows the current through the main field coil to be turned off, for example, at the latest when all the electrons have hit the target. This avoids that the main field coil still absorbs energy even when there are no more electrons in the betatron tube, so therefore the power loss of the betatrone is minimized.
- this opens up the possibility of varying the repetition frequency of the electron pulses and hence of the x-ray pulses.
- a drive circuit of a main field coil in a betatron has, for example, an energy store, two power switches and two diodes.
- the drive circuit corresponds to a half-bridge of a first branch with a first power switch and a first diode and a second branch parallel thereto with a second diode and a second power switch.
- the Main field coil forms the bridge between the two branches. The ends of the two branches are connected to the terminals of an energy store.
- the terminals of the energy storage are connected to a voltage source.
- the voltage source charges the energy store and supplies the drive circuit with the power required for accelerating the electrons.
- the voltage source can be permanently connected to the energy storage, since the energy storage is operated with a constant polarity.
- the circuit breakers are turn-off power semiconductors such as IGBT (Insulated Gate Bipolar Transistor) or MOSFET (Metal Oxide Semiconductor Field Effect Transistor).
- IGBT Insulated Gate Bipolar Transistor
- MOSFET Metal Oxide Semiconductor Field Effect Transistor
- the energy store is preferably a bipolar capacitor such as a foil capacitor.
- Such capacitors have a high current-carrying capacity and a long service life.
- a betatron according to the invention is advantageously used in an X-ray inspection system for security checking of objects. Electrons are injected into the betatron and accelerated before being directed to a target made of tantalum, for example. There, the electrons generate X-radiation with a known spectrum. The X-radiation is directed to the object, preferably a container and / or a vehicle, and modified there, for example, by scattering or transmission attenuation. The modified X-radiation is measured by an X-ray detector and analyzed by means of an evaluation unit. From the result, the nature or content of the object is deduced.
- the present invention will be explained in more detail with reference to an embodiment. Show
- FIG. 1 is a schematic sectional view of a betatron
- Figure 2 shows a drive circuit for an expansion coil
- Figure 1 shows the schematic structure of a betatrone 1 in cross section. It consists inter alia of a rotationally symmetrical inner yoke of two spaced-apart parts 2a, 2b, four blanks 3 between the inner yoke parts 2a, 2b, wherein the longitudinal axis of the blanks 3 of the rotational axis of symmetry of the inner yoke corresponds to an outer yoke 4 connecting the two mecanicjochteile 2a, 2b a torus-shaped betatron tube 5, two main field coils L1 and L2 and an expansion coil 6 arranged between the inner yoke parts 2a, 2b.
- the central axis of the expansion coil 6 coincides with the rotational symmetry axis of the inner yoke. Because of this arrangement and the size of the expansion coil 6, the magnetic field generated by it passes through a circular area whose radius is greater than the radius of the round blanks 3 and approximately in the range of the nominal orbit radius r ⁇ the electrons.
- the magnetic field generated by the main field coils L1 and L2 passes through the inner yoke portions 2a and 2b, and the magnetic circuit is closed by the outer yoke 4.
- the shape of the inner and / or outer yoke can be selected by the skilled person depending on the application and deviate from the shape shown in Figure 1. Also, only one or more than two main field coils may be present. Another number and / or shape of the blanks is also possible.
- the magnetic field passes partially through the blanks 3 and otherwise through an air gap. In this air gap, the betatron tube 5 is arranged. It is an evacuated tube in which the electrons are accelerated.
- the end faces of the inner yoke parts 2a and 2b have a shape selected such that the magnetic field between them focuses the electrons on a circular path.
- the design of the end faces is known in the art and is therefore not explained in detail.
- the electrons strike a target and thereby generate X-radiation whose spectrum depends, among other things, on the final energy of the electrons and the material of the target.
- the electrons are injected into the betatron tube 5 with an initial energy.
- the magnetic field in the betatron 1 is continuously increased by the main field coils L1 and L2. This creates an electric field that exerts an accelerating force on the electrons.
- the electrons are forced due to the Lorentz force on a Soll Vietnamesebahn within the betatron tube 5.
- the acceleration of the electrons is cyclically repeated, resulting in a pulsed X-radiation.
- the electrons are injected into the betatron tube 5 in a first step.
- the electrons are accelerated by an increasing current in the main field coil L1 and L2 and thus an increasing magnetic field in the air gap between the inner yoke parts 2a and 2b in the circumferential direction of their circular path.
- the expansion coil is subjected to an expansion pulse, whereby the Widerröe'- condition is changed and the accelerated electrons are discharged to generate the X-radiation on the target. This is followed by an optional pause before electrons are again injected into the betatron tube 5.
- FIG. 3 shows a drive circuit 11 for the series-connected main field coils L1 and L2.
- the circuit consists of a capacitor C 1, two IGBT TR1 and TR2 and two diodes D1 and D2.
- the first IGBT TR1 and the first diode D1 are connected in series such that a first terminal 14 of the capacitor C to the collector 16 of the first IGBT TR1, the emitter 17 of the first IGBT TR1 to the cathode 19 of the first diode D1 and the anode 20 of the first diode D1 is connected to a second terminal 15 of the capacitor C.
- the second IGBT TR2 and the second diode D2 are connected in series such that the cathode 21 of the second diode D2 to the first terminal 14 of the capacitor C, the anode 22 of the second diode D2 to the collector 23 of the second IGBT TR2 and the emitter 24 of the second IGBT TR2 is connected to the second terminal 15 of the capacitor C.
- the base terminals 18 and 25 of the IGBT TR1 and TR2 are connected to the control electronics 8.
- a terminal 26 of the main field coil L1 is connected to the emitter 17 of the first IGBT TR1, a terminal 27 of the main field coil L2 is connected to the collector 23 of the second IGBT TR2.
- About the terminals 12 and 13 of the capacitor C and thus the drive circuit 11 is optionally connected to a voltage source.
- the construction of the drive circuit 7 for the expansion coil 6 corresponds to that of the drive circuit 11 for the main field coils L1 and L2 of FIG. 3.
- the electronic control unit 8 switches on the IGBT 9 of the drive circuit 7 of the expansion coil 6 and thus starts the expansion pulse.
- the electrons are diverted from the desired path and directed to a target.
- the expansion pulse ends.
- the magnetic field generated by the main field coils L1 and L2 is reduced again.
- the degrading magnetic field generates a current flow I with decreasing current through the diodes D1 and D2 to the capacitor C 1 until the energy stored in the main field coils L1 and L2 has flowed back into the capacitor C.
- the current direction through the main field coils L1 and L2 is the same as in the construction of the magnetic field, on the capacitor C, however, directed in opposite directions.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006056018A DE102006056018A1 (de) | 2006-11-28 | 2006-11-28 | Kreisbeschleuniger mit einstellbarer Elektronen-Endenergie |
PCT/EP2007/007767 WO2008064728A1 (de) | 2006-11-28 | 2007-09-06 | Kreisbeschleuniger mit einstellbarer elektronen-endenergie |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2095696A1 true EP2095696A1 (de) | 2009-09-02 |
EP2095696B1 EP2095696B1 (de) | 2014-11-19 |
Family
ID=38698401
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07802170.6A Active EP2095696B1 (de) | 2006-11-28 | 2007-09-06 | Kreisbeschleuniger mit einstellbarer elektronen-endenergie |
Country Status (7)
Country | Link |
---|---|
US (1) | US7983393B2 (de) |
EP (1) | EP2095696B1 (de) |
CN (1) | CN101513137B (de) |
DE (1) | DE102006056018A1 (de) |
HK (1) | HK1132132A1 (de) |
RU (2) | RU2009124598A (de) |
WO (1) | WO2008064728A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2557798C1 (ru) * | 2014-03-13 | 2015-07-27 | Федеральное госудерственное образовательное учреждение высшего профессионального образования "Национальный исследовательский Томский политехнический университет" | Способ ускорения электронов |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL73372C (de) * | 1946-12-11 | |||
DE58906047D1 (de) * | 1989-08-09 | 1993-12-02 | Heimann Systems Gmbh & Co | Vorrichtung zum Durchstrahlen von Gegenständen mittels fächerförmiger Strahlung. |
US5077530A (en) * | 1990-10-16 | 1991-12-31 | Schlumberger Technology Corporation | Low-voltage modulator for circular induction accelerator |
US5122662A (en) * | 1990-10-16 | 1992-06-16 | Schlumberger Technology Corporation | Circular induction accelerator for borehole logging |
US5319314A (en) * | 1992-09-08 | 1994-06-07 | Schlumberger Technology Corporation | Electron orbit control in a betatron |
UA53671C2 (uk) * | 1996-11-07 | 2003-02-17 | Англо Амерікан Корпорейшн Оф Саут Африка Лімітед | Генератор імпульсів для збудження котушки періодичними біполярними імпульсами (варіанти) та спосіб генерування послідовності періодичних біполярних імпульсів струму (варіанти) |
WO1998057335A1 (en) * | 1997-06-10 | 1998-12-17 | Adelphi Technology, Inc. | Thin radiators in a recycled electron beam |
CN1209037A (zh) * | 1997-08-14 | 1999-02-24 | 深圳奥沃国际科技发展有限公司 | 大跨度回旋加速器 |
US7103137B2 (en) * | 2002-07-24 | 2006-09-05 | Varian Medical Systems Technology, Inc. | Radiation scanning of objects for contraband |
WO2004073364A1 (ja) * | 2003-02-17 | 2004-08-26 | Mitsubishi Denki Kabushiki Kaisha | 荷電粒子加速器 |
-
2006
- 2006-11-28 DE DE102006056018A patent/DE102006056018A1/de not_active Withdrawn
-
2007
- 2007-09-06 RU RU2009124598/07A patent/RU2009124598A/ru unknown
- 2007-09-06 EP EP07802170.6A patent/EP2095696B1/de active Active
- 2007-09-06 WO PCT/EP2007/007767 patent/WO2008064728A1/de active Application Filing
- 2007-09-06 CN CN2007800333652A patent/CN101513137B/zh active Active
-
2009
- 2009-05-28 US US12/473,839 patent/US7983393B2/en active Active
- 2009-10-29 HK HK09110042.8A patent/HK1132132A1/xx unknown
-
2013
- 2013-05-08 RU RU2013121154/07A patent/RU2013121154A/ru not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2008064728A1 * |
Also Published As
Publication number | Publication date |
---|---|
RU2013121154A (ru) | 2014-11-20 |
CN101513137A (zh) | 2009-08-19 |
EP2095696B1 (de) | 2014-11-19 |
DE102006056018A1 (de) | 2008-05-29 |
HK1132132A1 (en) | 2010-02-12 |
US7983393B2 (en) | 2011-07-19 |
WO2008064728A1 (de) | 2008-06-05 |
RU2009124598A (ru) | 2011-01-10 |
CN101513137B (zh) | 2011-01-19 |
US20090290684A1 (en) | 2009-11-26 |
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