Radio-frequency power generator configured to reduce electromagnetic emissions

Patent metadata

Field	Value
Publication number	US-9456532-B2
Application number	US-201414575958-A
Country	US
Kind code	B2
Filing date	Dec 18, 2014
Priority date	Dec 18, 2014
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

Radio frequency (RF) power generator including an outer enclosure having a system cavity. The outer enclosure separates the system cavity from an exterior of the RF power generator. The outer enclosure is configured to reduce leakage of the electromagnetic radiation into the exterior. The RF power generator also includes a feedthrough assembly comprising a coaxial line configured to receive electric power generated by an RF amplification system. The coaxial line is positioned within the system cavity and has inner and outer conductors. The feedthrough assembly includes a connector shield that forms a feedthrough to the exterior of the RF power generator. The connector shield is electrically coupled to the outer conductor of the coaxial line and integrated with the outer enclosure to reduce leakage of electromagnetic radiation into the exterior.

First claim

What is claimed is:

1. A radio frequency (RF) power generator comprising:
an outer enclosure having a system cavity, the outer enclosure separating the system cavity from an exterior of the RF power generator;
an RF amplification system disposed in the system cavity and emitting electromagnetic radiation while producing electric power for energizing a particle accelerator, the outer enclosure being configured to reduce leakage of the electromagnetic radiation into the exterior; and
a feedthrough assembly comprising a coaxial line configured to receive the electric power generated by the RF amplification system, the coaxial line being positioned within the system cavity and having inner and outer conductors, the feedthrough assembly including a connector shield that forms a passage to the exterior of the RF power generator, the connector shield being electrically coupled to the outer conductor of the coaxial line and integrated with the outer enclosure to reduce leakage of the electromagnetic radiation into the exterior.

2. The RF power generator of claim 1 , wherein the connector shield is welded to the outer enclosure.

3. The RF power generator of claim 1 , wherein the connector shield includes a mating head that defines the passage and is configured to engage the external cable, the connector shield including a securing wall that surrounds the mating head and is spaced apart from the mating head, the securing wall being welded to the outer enclosure.

4. The RF power generator of claim 1 , further comprising a directional coupler disposed within the system cavity, the directional coupler including the inner conductor and the outer conductor of the coaxial line and pickup elements for measuring forward and reflected power along the coaxial line.

5. The RF power generator of claim 1 , further comprising an inner enclosure positioned within the system cavity and surrounding the RF amplification system, the outer enclosure and the inner enclosure defining an outer space therebetween, the inner enclosure configured to reduce electromagnetic radiation generated therein from leaking into the system cavity, the inner conductor being positioned within the inner enclosure.

6. The RF power generator of claim 1 , further comprising an inner enclosure positioned within the system cavity, the inner enclosure including interior walls that define a power compartment and a port compartment, the power compartment having the electric power generated therein, wherein the inner conductor is positioned within the port compartment and the interior walls that define the port compartment are a portion of the outer conductor of the coaxial line.

7. The RF power generator of claim 1 , wherein the RF amplification system is configured to produce at least 5 kilowatts.

8. A radio frequency (RF) power generator comprising:
an outer enclosure having a system cavity, the outer enclosure separating the system cavity from an exterior of the RF power generator;
an RF amplification system disposed in the system cavity and emitting electromagnetic radiation while producing electric power for energizing a particle accelerator, the outer enclosure being configured to reduce leakage of the electromagnetic radiation into the exterior; and
an inner enclosure positioned within the system cavity, the system cavity including an outer space that exists between the inner and outer enclosures, the inner enclosure including interior walls that form a plurality of compartments having respective access openings that open to the outer space, the inner enclosure including a movable access panel that is configured to engage the interior walls and cover the access openings, the RF amplification system being located within at least one of the compartments, the inner enclosure being configured to reduce leakage of the electromagnetic radiation into the outer space and the exterior.

9. The RF power generator of claim 8 , wherein the compartments include a power compartment and a port compartment that is separated from the power compartment by at least one of the interior walls, the electric power for energizing the particle accelerator being generated within the power compartment, wherein the RF power generator includes a coaxial line that transmits the electric power through the port compartment to a passage that opens to the exterior.

10. The RF power generator of claim 9 , wherein the power compartment is devoid of openings that open directly to the exterior.

11. The RF power generator of claim 9 , further comprising a connector shield positioned within or along the port compartment and forming the passage to the exterior, the connector shield being welded to the outer enclosure.

12. The RF power generator of claim 9 , wherein the port compartment comprises a directional coupler that measures forward and reflected power along the coaxial line.

13. The RF power generator of claim 12 , further comprising a connector shield positioned within or along the port compartment and forming the passage to the exterior, the connector shield being welded to the outer enclosure and electrically coupled to an outer conductor of the directional coupler.

14. The RF power generator of claim 9 , wherein the interior walls include a grounding deck that is capable of being moved to change sizes of the compartments that are partially defined by the grounding deck, the RF amplification system including a power tube that is coupled to the grounding deck.

15. The RF power generator of claim 9 , further comprising a conductive frame that engages the movable access panel, the conductive frame including a plurality of flexible conductive elements that are distributed therealong.

16. A radio frequency (RF) power generator comprising:
an outer enclosure having a system cavity, the outer enclosure separating the system cavity from an exterior of the RF power generator;
an RF amplification system disposed in the system cavity and emitting electromagnetic radiation while producing electric power for energizing a particle accelerator, the outer enclosure being configured to reduce leakage of the electromagnetic radiation into the exterior; and
a plurality of interior walls positioned within the system cavity forming a power compartment and a port compartment, the electric power being produced within the power compartment, the port compartment including an inner conductor therein that receives the electric power;
wherein an outer conductor is at least partially formed by at least one of the interior walls, the RF power generator further comprising pickup elements positioned relative to the inner conductor within the port compartment, wherein the inner conductor, the outer conductor, and the pickup elements form a directional coupler disposed within the system cavity of the outer enclosure that measures forward and reflected power.

17. The RF power generator of claim 16 , further comprising a connector shield positioned within or along the port compartment and forming a passage through the outer enclosure to the exterior, the connector shield being electrically coupled to the outer conductor.

18. The RF power generator of claim 17 , wherein the connector shield is welded to the outer enclosure.

19. The RF power generator of claim 16 , further comprising at least one dielectric mounting spacer that holds the inner conductor at a designated position within the port compartment.

20. The RF power generator of claim 16 , wherein the power compartment and the port compartment share at least one of the interior walls.

Assignees

• Gen Electric

Inventors

• Bäcklund Andreas

Classifications

• H05H7/02 Primary

  Circuits or systems for supplying or feeding radio-frequency energy · CPC title

• H05H2007/025

  Radiofrequency systems · CPC title

• H05H15/00

  Methods or devices for acceleration of charged particles not otherwise provided for {, e.g. wakefield accelerators} · CPC title

• H05K9/0009 Primary

  with provisions to reduce EMI leakage through the joining parts · CPC title

• H03B2202/084

  through shielding · CPC title