WO2012065799A1 - Cavité hf et accélérateur de particules présentant une cavité hf - Google Patents

Cavité hf et accélérateur de particules présentant une cavité hf Download PDF

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Publication number
WO2012065799A1
WO2012065799A1 PCT/EP2011/068208 EP2011068208W WO2012065799A1 WO 2012065799 A1 WO2012065799 A1 WO 2012065799A1 EP 2011068208 W EP2011068208 W EP 2011068208W WO 2012065799 A1 WO2012065799 A1 WO 2012065799A1
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WO
WIPO (PCT)
Prior art keywords
cavity
section
drive device
wall
solid
Prior art date
Application number
PCT/EP2011/068208
Other languages
German (de)
English (en)
Inventor
Oliver Heid
Timothy Hughes
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2012065799A1 publication Critical patent/WO2012065799A1/fr

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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
    • H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • H05H7/02—Circuits or systems for supplying or feeding radio-frequency energy
    • 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
    • H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • H05H7/14—Vacuum chambers
    • H05H7/18—Cavities; Resonators
    • 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
    • H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • H05H7/22—Details of linear accelerators, e.g. drift tubes
    • H05H2007/227—Details of linear accelerators, e.g. drift tubes power coupling, e.g. coupling loops

Definitions

  • the present invention relates to an RF cavity according to the preamble of patent claim 1 and a sectionchenbe ⁇ accelerator with an RF cavity according to the preamble of claim 8.
  • RF cavities high-frequency electromagnetic oscillations can be excited.
  • Such RF cavities can also be referred to as resonators.
  • RF cavities are used in particle accelerators to accelerate electrically charged particles.
  • a high-frequency electromagnetic vibration in a RF cavity For exciting a high frequency electromagnetic vibration in a RF cavity, it is known to generate a high-frequency power for example by means of a klystron and coupled into the cavity via a waveguide to the RF cavity to transpor ⁇ animals or by means of an attenuator or an inductive ⁇ ven coupler , However, it is not possible to achieve arbitrarily high RF powers with this type of excitation. From EP 0606870 Al a RF cavity with egg ⁇ ner conductive wall is known to provide with a plurality of solid state amplifiers that are provided for a high-frequency current flow in the wall of the RF cavity to indu ⁇ decorate and thereby a high frequency to excite electromagnetic vibration in the RF cavity.
  • the object of the present invention is to provide an improved RF cavity. This object is achieved by an RF cavity having the features of claim 1. It is a further object of the present invention to provide an improved particle accelerator. This object is achieved by a particle accelerator with the characteristics of Spell 8 solved. Preferred developments are specified in the dependent claims from ⁇ .
  • An RF cavity according to the invention comprises a chamber with an electrically conductive wall and a first drive device with a plurality of first solid-state switches, which are arranged along a circumference of the wall.
  • the first solid state switch depending ⁇ formed to couple an electrical current into the wall.
  • a second drive device is provided with a plurality of second solid-state switches, which are arranged along the circumference of the wall.
  • Each second solid state switch is ⁇ forms to couple an electric current into the wall.
  • the second drive device is oriented parallel to the first drive device.
  • the RF cavity can then have a large length.
  • Advantageously ⁇ proving to distribute power losses in driving the RF cavity then over large areas of the chamber wall, resulting in a higher overall drive power allowed.
  • the wall of the chamber of the RF cavity ers a ⁇ th portion, an electrically insulated relative to the first portion and second portion of an electrically opposite to the first portion and the second portion iso- Herten third portion.
  • the first drive ⁇ device with the first portion and the second portion and the second drive device with the second portion and the third portion is connected.
  • electrical currents induced in the wall then flow over the drive devices where they can be amplified.
  • the wall has a fourth section, which is electrically insulated from the first section, the second section and the third section.
  • a third drive device is provided with a plurality of third solid-state switches, wherein the third drive device is connected to the third drive. section and the fourth section is connected.
  • the chamber is hollow-cylindrical, the drive devices being arranged on a lateral surface of the chamber.
  • RF cavities can be used with hollow cylindrical chambers for many purposes.
  • the first drive device is connected to a first driver circuit for switching the first solid state switch and the second drive device is connected to a second driver circuit for switching the second solid state switch.
  • the first driver circuit and the second driver circuit are connected to a control circuit.
  • the control circuit can then drive the driver circuits of the drive devices.
  • the first driver circuit and the second driver circuit are designed to switch the first solid state switches and the second solid state switches synchronously.
  • the currents flowing in the wall of the chamber of the HF cavity can then be selectively influenced in order to suppress unwanted longitudinal modes.
  • the phases of the driving devices can be controlled so that desired longitudinal modes are excited.
  • the RF cavity In one embodiment of the HF cavity, this is designed to accelerate particles.
  • the RF cavity can then be used in particle accelerators.
  • a particle accelerator according to the invention has at least one HF cavity of the type described above.
  • Fig. 1 is a schematic side view of an RF cavity
  • FIG. 2 is a front view of the RF cavity
  • Fig. 3 is a perspective view of a portion of
  • FIG. 1 shows a highly schematic representation of a side view of an HF cavity 100.
  • FIG. 2 also shows a front view of this RF cavity 100 in a highly schematized form.
  • FIG. 3 shows a perspective view of a part of the RF cavity 100 Cavity 100 may also be referred to as an RF resonator.
  • the RF cavity 100 can be used, for example, in a particle accelerator, in particular in an AC linear accelerator.
  • the RF cavity 100 has a chamber 200.
  • the chamber 200 comprises a wall 210 of electrically conductive material, wherein ⁇ play, of a metal that encloses a cavity of the chamber 200th
  • the chamber 200 is designed as a hollow cylinder.
  • the wall 210 is formed by a lateral surface of the chamber 200.
  • the chamber 200 may in principle also have a shape other than a hollow cylindrical shape.
  • the wall 210 of the chamber 200 has a first portion 211, a second portion 212, a third portion 213, a fourth portion 214, a fifth portion 215 and a sixth portion 216.
  • the sections 211 to 216 are arranged one behind the other in the axial direction of the chamber 200. Each of the sections 211 to 216 thus also has the form of a cylinder jacket.
  • the individual sections 211 to 216 are connected in such a coaxial manner one behind the other. arranged to complement the cylinder jacket wall 210.
  • the first portion 211 and the adjacent second portion 212 of the wall 210 are electrically isolated from each other. This can be seen in FIG.
  • an insulating region 220 Between the first portion 211 and the second portion 212 is an insulating region 220.
  • the insulating region 220 may be formed, for example, by an air or vacuum gap between the portions 211, 212. However, the insulating region 220 may also comprise other electrically insulating material on ⁇ . Accordingly, the second portion 212 is elekt ⁇ driven relative to the third section 213, the third section 213 opposite the fourth section 214, the fourth section 214 opposite the fifth section 215 and the fifth section 215 opposite the sixth section 216 is isolated.
  • the HF cavity 100 also has a first drive device 310, a second drive device 320, a third drive
  • Each of the drive devices 310 to 350 is disposed along a circumference of the wall 210 and oriented perpendicular to the longitudinal axis of the chamber 200.
  • the first drive device 310 is 211 and the second portion 212 of the wall 210 at ⁇ arranged in the area of the insulating region 220 between the first portion.
  • the second drive device 320 is correspondingly arranged between the second section 212 and the third section 213.
  • the third drive device 330 is disposed between the third portion 213 and the fourth portion 214.
  • the fourth driving apparatus 340 is arranged is 215 ⁇ between the fourth portion 214 and the fifth section.
  • the fifth drive device 350 is between the fifth section 215 and the sixth section 216 angeord ⁇ net.
  • the configuration of the RF cavity 100 with a partitioned into six sections 211 to 216 wall 210 and five drive ⁇ device 310, 320, 330, 340, 350 is merely an example to understand.
  • the RF cavity 100 can also have fewer or more drive devices and sections electrically insulated from one another.
  • the wall 210 could be divided into only four electrically isolated sections.
  • the RF cavity 100 has three drive devices disposed along the insulating regions between the four sections of the wall.
  • the drive device 310, 320, 330, 340, 350 are shown only schematically.
  • Figure 3 shows a more detailed view of a portion of the first drive ⁇ device 310.
  • the first drive device 310 includes a plurality of first solid-state switch 315, the 210 along the insulating region 220 between the first portion 211 and the second portions 212 in the circumferential direction of the wall are arranged uniform angular distance from each other. In order to make the insulating region 220 more readily recognizable, not all of the first solid-state switches 315 are shown in FIG.
  • the first drive device 310 may include 64 first solid state switches 315.
  • Each first solid state switch 315 may be formed, for example, as a printed circuit board with amplifier circuits arranged thereon. Each printed circuit board is then perpendicular to the cylinder jacket wall 210. Each first solid state switch 315 has a current path 316 which provides a conductive connection between the first portion 211 and the second portion 212 of the wall 210 of the chamber 200. Each first solid state switch 315 is configured to energize and amplify a current flow 230 between the first portion 211 and the second portion 212 via the current path 316. The current flow 230 may be a high-frequency alternating current.
  • the second drive device 320, the third drive device 330, the fourth drive device 340 and the fifth drive device 350 are configured analogously to the first drive device 310.
  • the second drive device 320 has a plurality of second solid-state switches that can excite a current flow 230 between the second section 212 and the third section 213.
  • the third drive device 330 has a plurality of third solid-state switches which can excite a current flow 230 between the third section 213 and the fourth section 214.
  • the fourth drive device 340 has a plurality of fourth solid-state switches that can excite a current flow 230 between the fourth section 214 and the fifth section 215.
  • the fifth drive device 350 has a plurality of fifth solid-state switches, which have a
  • the first drive device 310 is connected to a first driver circuit 410.
  • the second drive device is connected to a first driver circuit 410.
  • the driver circuits 410 to 450 are provided to switch the driving devices 310 to 350. For this purpose, the driver circuits 410 to 450 supply the respective drive device 310 to 350 with a high-frequency signal having a desired frequency.
  • the HF cavity 100 has a control circuit 500.
  • the control circuit 500 is provided with the first driver circuit 410, the second driver circuit 420, the third driver circuit 430, the fourth driver circuit 440, and the fifth driver circuit 440.
  • Driver circuit 450 connected.
  • the control circuit 500 is provided to synchronize the drive circuits 410 to 450.
  • the high-frequency signal provided by the first drive circuit 410 of the first drive device 310 and the high-frequency signal provided by the second drive circuit 420 of the second drive device 320 can be synchronized with each other. It is also possible to synchronize the high-frequency signals output by the driver circuits 410 to 450 in such a way that they have desired phase differences from one another.
  • the wall 210 of the chamber 200 can impart currents with different spatial and temporal course. For example only, it is approximately possible that a current flow occurs at a certain time in the second portion 212 of the wall 210, 230 in the direction of the second drive device 320, while in the fifth From ⁇ section 215, a current 230 in the direction of the fourth driving apparatus 314 flows.
  • a current 230 in the direction of the fourth driving apparatus 314 flows.
  • the HF cavity 100 equipped with a plurality of drive devices 310 to 350 has significantly greater flexibility than a conventional HF cavity with only one drive device.
  • a further advantage of the RF cavity 100 with a plurality of drive devices 310 to 350 is that by means of the plurality of drive devices 310 to 350, which each comprise a plurality of solid state switches, the supply of electromagnetic power into the chamber 200 over a large portion of the wall 210 of Chamber 200 is distributed. So are also the places where inevitable power losses occur ⁇ and creates waste heat, spread over a large area of the wall 210 of the chamber 200th This allows the Chamber 200 to increase total supplied power without power losses at individual locations exceed a critical value.
  • the excitation powers are advantageously generated only at the location of the excitation. IMP EXP ⁇ together can thus be in the RF cavity 100 higher oscillations ⁇ disposal services than conventional RF cavities achieve.
  • the chamber 200 may have a large length in the axial direction.
  • the RF cavity 100 is particularly suitable for use in particle accelerators, for example for use in AC linear accelerators.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Particle Accelerators (AREA)

Abstract

L'invention concerne une cavité HF comprenant une chambre dotée d'une paroi électriquement conductrice et un premier dispositif d'entraînement présentant une multitude de premiers commutateurs à l'état solide, qui sont disposés le long d'une périphérie de la paroi. Chaque premier commutateur à l'état solide est en l'occurrence conçu pour injecter un courant électrique dans la paroi. De plus, la cavité HF comprend un deuxième dispositif d'entraînement présentant une multitude de deuxièmes commutateurs à l'état solide, qui sont disposés le long de la périphérie de la paroi. Chaque deuxième commutateur à l'état solide est en l'occurrence également conçu pour intégrer un courant électrique dans la paroi. En outre, le deuxième dispositif d'entraînement est orienté parallèlement au premier dispositif d'entraînement.
PCT/EP2011/068208 2010-11-18 2011-10-19 Cavité hf et accélérateur de particules présentant une cavité hf WO2012065799A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010044113.9 2010-11-18
DE102010044113A DE102010044113A1 (de) 2010-11-18 2010-11-18 HF-Kavität und Teilchenbeschleuniger mit HF-Kavität

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WO2012065799A1 true WO2012065799A1 (fr) 2012-05-24

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6650146B2 (ja) * 2015-12-25 2020-02-19 三菱重工機械システム株式会社 加速空洞及び加速器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066988A (en) * 1976-09-07 1978-01-03 Stanford Research Institute Electromagnetic resonators having slot-located switches for tuning to different frequencies
EP0606870A1 (fr) 1993-01-11 1994-07-20 Polytechnic University Cavité active à radio-fréquence
WO2011061026A1 (fr) * 2009-11-17 2011-05-26 Siemens Aktiengesellschaft Cavité hf et accélérateur pourvu d'une telle cavité

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066988A (en) * 1976-09-07 1978-01-03 Stanford Research Institute Electromagnetic resonators having slot-located switches for tuning to different frequencies
EP0606870A1 (fr) 1993-01-11 1994-07-20 Polytechnic University Cavité active à radio-fréquence
WO2011061026A1 (fr) * 2009-11-17 2011-05-26 Siemens Aktiengesellschaft Cavité hf et accélérateur pourvu d'une telle cavité

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HEID O ET AL: "Compact Solid State Direct drive RF Linac", 23 May 2010 (2010-05-23), pages 4278 - 4280, XP002658698, ISBN: 978-92-9083-352-9, Retrieved from the Internet <URL:http://accelconf.web.cern.ch/AccelConf/IPAC10/papers/thpd002.pdf> [retrieved on 20110908] *

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