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WO2008035053A3 - Emitter for a thermionic dispenser cathode, method of manufacturing it and thermionic device including it - Google Patents

Emitter for a thermionic dispenser cathode, method of manufacturing it and thermionic device including it Download PDF

Info

Publication number
WO2008035053A3
WO2008035053A3 PCT/GB2007/003529 GB2007003529W WO2008035053A3 WO 2008035053 A3 WO2008035053 A3 WO 2008035053A3 GB 2007003529 W GB2007003529 W GB 2007003529W WO 2008035053 A3 WO2008035053 A3 WO 2008035053A3
Authority
WO
WIPO (PCT)
Prior art keywords
thermionic
emitter
manufacturing
dispenser cathode
emission surface
Prior art date
Application number
PCT/GB2007/003529
Other languages
French (fr)
Other versions
WO2008035053A2 (en
Inventor
Angelo Niko Grubisic
Original Assignee
Univ Surrey
Angelo Niko Grubisic
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 Univ Surrey, Angelo Niko Grubisic filed Critical Univ Surrey
Publication of WO2008035053A2 publication Critical patent/WO2008035053A2/en
Publication of WO2008035053A3 publication Critical patent/WO2008035053A3/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/025—Hollow cathodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
    • B64G1/00—Cosmonautic vehicles
    • B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
    • B64G1/40—Arrangements or adaptations of propulsion systems
    • B64G1/402—Propellant tanks; Feeding propellants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
    • B64G1/00—Cosmonautic vehicles
    • B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
    • B64G1/40—Arrangements or adaptations of propulsion systems
    • B64G1/411—Electric propulsion
    • B64G1/413—Ion or plasma engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
    • B64G1/00—Cosmonautic vehicles
    • B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
    • B64G1/40—Arrangements or adaptations of propulsion systems
    • B64G1/411—Electric propulsion
    • B64G1/415—Arcjets or resistojets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03H—PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03H1/00—Using plasma to produce a reactive propulsive thrust
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • H01J9/042—Manufacture, activation of the emissive part
    • H01J9/047—Cathodes having impregnated bodies

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Remote Sensing (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Plasma Technology (AREA)
  • Cold Cathode And The Manufacture (AREA)

Abstract

A method of manufacturing an emitter (8; 10) for a thermionic dispenser cathode, includes forming a porous emitter body with substantially interconnected pores, having an emission surface (11; 16) from which, upon application of heat, electrons are emitted. The porous emitter body is suitable for transporting through the substantially interconnected pores, a compound released upon application of heat, to the emission surface (11; 16), which compound, when deposited on the emission surface (11; 16), serves to lower an effective work function of the emitter (8; 10). The porous emitter body is formed by means of a process of deposition of material. At least a region of the porous emitter body is provided with a continuously varying porosity. The porosity is continuously varied by controlling at least one parameter of the deposition process.
PCT/GB2007/003529 2006-09-19 2007-09-18 Emitter for a thermionic dispenser cathode, method of manufacturing it and thermionic device including it WO2008035053A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0618411.3A GB0618411D0 (en) 2006-09-19 2006-09-19 Thermo-electric propulsion device, method of operating a thermo-electric propulsion device and spacecraft
GB0618411.3 2006-09-19

Publications (2)

Publication Number Publication Date
WO2008035053A2 WO2008035053A2 (en) 2008-03-27
WO2008035053A3 true WO2008035053A3 (en) 2008-05-29

Family

ID=37421225

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2007/003529 WO2008035053A2 (en) 2006-09-19 2007-09-18 Emitter for a thermionic dispenser cathode, method of manufacturing it and thermionic device including it

Country Status (2)

Country Link
GB (1) GB0618411D0 (en)
WO (1) WO2008035053A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3024436B1 (en) * 2014-07-30 2018-01-05 Safran Aircraft Engines SYSTEM AND METHOD FOR SPACE PROPULSION

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR920007416B1 (en) * 1990-09-07 1992-08-31 삼성전관 주식회사 Manufacturing method of dispenser cathode structure
JPH05251044A (en) * 1992-03-04 1993-09-28 Toshiba Lighting & Technol Corp Cold cathode discharge lamp
EP0915492A1 (en) * 1997-11-04 1999-05-12 Sony Corporation Impregnated cathode and method of manufacturing the same, electron gun and electron tube
US6304024B1 (en) * 1995-06-09 2001-10-16 Kabushiki Kaisha Toshiba Impregnated-type cathode substrate with large particle diameter low porosity region and small particle diameter high porosity region
US6306003B1 (en) * 1997-07-09 2001-10-23 Matsushita Electric Industrial Co., Ltd. Impregnated cathode and method for manufacturing the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR920007416B1 (en) * 1990-09-07 1992-08-31 삼성전관 주식회사 Manufacturing method of dispenser cathode structure
JPH05251044A (en) * 1992-03-04 1993-09-28 Toshiba Lighting & Technol Corp Cold cathode discharge lamp
US6304024B1 (en) * 1995-06-09 2001-10-16 Kabushiki Kaisha Toshiba Impregnated-type cathode substrate with large particle diameter low porosity region and small particle diameter high porosity region
US6306003B1 (en) * 1997-07-09 2001-10-23 Matsushita Electric Industrial Co., Ltd. Impregnated cathode and method for manufacturing the same
EP0915492A1 (en) * 1997-11-04 1999-05-12 Sony Corporation Impregnated cathode and method of manufacturing the same, electron gun and electron tube

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CH. CARPENTER, M. PATTERSON: "High-Current Hollow Cathode Development", 27TH INTERNATIONAL ELECTRIC PROPULSION CONFERENCE, no. IEPC-01-274, October 2001 (2001-10-01) - October 2001 (2001-10-01), Pasadena, CA, XP002460481 *
DATABASE WPI Week 1993, Derwent World Patents Index; AN 1993-255766, XP002461607, "Dispense cathode manufacture useful braun tube ..." *

Also Published As

Publication number Publication date
GB0618411D0 (en) 2006-11-01
WO2008035053A2 (en) 2008-03-27

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