WO2004066335A3 - Thermally modulated field emission cathode and beam current measurement technique - Google Patents

Thermally modulated field emission cathode and beam current measurement technique Download PDF

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Publication number
WO2004066335A3
WO2004066335A3 PCT/US2004/000974 US2004000974W WO2004066335A3 WO 2004066335 A3 WO2004066335 A3 WO 2004066335A3 US 2004000974 W US2004000974 W US 2004000974W WO 2004066335 A3 WO2004066335 A3 WO 2004066335A3
Authority
WO
WIPO (PCT)
Prior art keywords
cathode
ray
field emission
current
ray tube
Prior art date
Application number
PCT/US2004/000974
Other languages
French (fr)
Other versions
WO2004066335A2 (en
Inventor
Mark Dinsmore
Original Assignee
Zeiss Stiftung
Mark Dinsmore
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 Zeiss Stiftung, Mark Dinsmore filed Critical Zeiss Stiftung
Priority to JP2006500962A priority Critical patent/JP2006524881A/en
Priority to EP04702505A priority patent/EP1588393A4/en
Publication of WO2004066335A2 publication Critical patent/WO2004066335A2/en
Publication of WO2004066335A3 publication Critical patent/WO2004066335A3/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/32—Tubes wherein the X-rays are produced at or near the end of the tube or a part thereof which tube or part has a small cross-section to facilitate introduction into a small hole or cavity
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/08—Electrical details
    • H05G1/26—Measuring, controlling or protecting
    • H05G1/30—Controlling
    • H05G1/46—Combined control of different quantities, e.g. exposure time as well as voltage or current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2235/00—X-ray tubes
    • H01J2235/06—Cathode assembly
    • H01J2235/062—Cold cathodes

Abstract

An x-ray source includes a carbon nanotube FE (field emission) cathode that is heated with laser light propagated down a fiber optic cable. The resulting two-terminal x-ray tube allows for independent control of tube voltage and tube current. Control of the tube voltage is typically achieved using a control electrode, whereas the field emission tube current is controlled by thermal modulation. A technique is provided for accurately measuring beam current in the x-ray source. The method includes activating the cathode and adjusting the laser intensity, until a desired dose of output x-ray radiation is attained, then measuring the total x-ray tube current. The cathode is then turned off, so that the electron beam is turned off. The total x-ray tube current is measured again. The cathode is turned on again, immediately thereafter. The difference between the two values of the total x-ray tube current gives the correct x-ray tube beam current.
PCT/US2004/000974 2003-01-16 2004-01-15 Thermally modulated field emission cathode and beam current measurement technique WO2004066335A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2006500962A JP2006524881A (en) 2003-01-16 2004-01-15 Thermally tuned field emission cathode and beam current measurement techniques
EP04702505A EP1588393A4 (en) 2003-01-16 2004-01-15 Thermally modulated field emission cathode and beam current measurement technique

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US44045403P 2003-01-16 2003-01-16
US44048303P 2003-01-16 2003-01-16
US60/440,454 2003-01-16
US60/440,483 2003-01-16

Publications (2)

Publication Number Publication Date
WO2004066335A2 WO2004066335A2 (en) 2004-08-05
WO2004066335A3 true WO2004066335A3 (en) 2008-08-14

Family

ID=32776017

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/000974 WO2004066335A2 (en) 2003-01-16 2004-01-15 Thermally modulated field emission cathode and beam current measurement technique

Country Status (3)

Country Link
EP (1) EP1588393A4 (en)
JP (1) JP2006524881A (en)
WO (1) WO2004066335A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2684499A1 (en) * 2007-05-04 2008-11-13 Boegli-Gravures S.A. Method and device for the recognition of an authenticating mark on an enveloped surface of an object

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6324257B1 (en) * 1998-06-04 2001-11-27 X-Technologies Inc. Radiotherapeutical device and use thereof
US6799075B1 (en) * 1995-08-24 2004-09-28 Medtronic Ave, Inc. X-ray catheter

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0924110A (en) * 1995-07-11 1997-01-28 Hitachi Medical Corp Treatment device using small x-ray source
US6463124B1 (en) * 1998-06-04 2002-10-08 X-Technologies, Ltd. Miniature energy transducer for emitting x-ray radiation including schottky cathode
JP2000164112A (en) * 1998-11-27 2000-06-16 Matsushita Electronics Industry Corp Negative electrode, manufacture of negative electrode and electron gun
US6195411B1 (en) * 1999-05-13 2001-02-27 Photoelectron Corporation Miniature x-ray source with flexible probe
IL140025A0 (en) * 2000-11-30 2002-02-10 Medirad I R T Ltd X-ray tube with fluid cooling
CN1596140A (en) * 2001-06-19 2005-03-16 光电子公司 Optically driven therapeutic radiation source

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6799075B1 (en) * 1995-08-24 2004-09-28 Medtronic Ave, Inc. X-ray catheter
US6324257B1 (en) * 1998-06-04 2001-11-27 X-Technologies Inc. Radiotherapeutical device and use thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1588393A4 *

Also Published As

Publication number Publication date
WO2004066335A2 (en) 2004-08-05
EP1588393A4 (en) 2009-09-30
EP1588393A2 (en) 2005-10-26
JP2006524881A (en) 2006-11-02

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