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Ferroelectric Cathode Electron Emission Dependence on Magnetic Field.

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Title: Ferroelectric Cathode Electron Emission Dependence on Magnetic Field.
Authors: Orbach, Yafit1, Pilossof, Moritz1, Einat, Moshe1
Source: IEEE Transactions on Electron Devices. Dec2014, Vol. 61 Issue 12, p4268-4272. 5p.
Subjects: Field emission cathodes, Electron emission, Ferroelectric crystals, Magnetic fields, Electric breakdown
Abstract: Many experiments on microwave and millimeter wave tubes, which are based on ferroelectric (FE) cathodes include a magnetic field in the emission region. For such electron devices, an optimal magnetic field leads to overall performance enhancement. In this paper, the dependence of the electron emission from an FE cathode on the magnetic field is experimentally examined and presented. The electron current emitted from an annular FE electron gun, suitable for gyrotron tubes, was measured with different magnetic fields. It was found that adding magnetic field extends the emitted current until a maximal working point is reached. Magnetic field above this point reduces the emission. A $ \sim 20$ % enhancement in the emitted current relative to the emission in the absence of a magnetic field is obtained. Another observation relates to the gap closure and breakdown effects. The influence of the magnetic field on these effects is also reported. A suitable working point for an electron tube is chosen according to these observations. [ABSTRACT FROM AUTHOR]
Copyright of IEEE Transactions on Electron Devices is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 100027874
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Ferroelectric Cathode Electron Emission Dependence on Magnetic Field.
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  Data: <searchLink fieldCode="AR" term="%22Orbach%2C+Yafit%22">Orbach, Yafit</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Pilossof%2C+Moritz%22">Pilossof, Moritz</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Einat%2C+Moshe%22">Einat, Moshe</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22IEEE+Transactions+on+Electron+Devices%22">IEEE Transactions on Electron Devices</searchLink>. Dec2014, Vol. 61 Issue 12, p4268-4272. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Field+emission+cathodes%22">Field emission cathodes</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+emission%22">Electron emission</searchLink><br /><searchLink fieldCode="DE" term="%22Ferroelectric+crystals%22">Ferroelectric crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+fields%22">Magnetic fields</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+breakdown%22">Electric breakdown</searchLink>
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  Data: Many experiments on microwave and millimeter wave tubes, which are based on ferroelectric (FE) cathodes include a magnetic field in the emission region. For such electron devices, an optimal magnetic field leads to overall performance enhancement. In this paper, the dependence of the electron emission from an FE cathode on the magnetic field is experimentally examined and presented. The electron current emitted from an annular FE electron gun, suitable for gyrotron tubes, was measured with different magnetic fields. It was found that adding magnetic field extends the emitted current until a maximal working point is reached. Magnetic field above this point reduces the emission. A $ \sim 20$ % enhancement in the emitted current relative to the emission in the absence of a magnetic field is obtained. Another observation relates to the gap closure and breakdown effects. The influence of the magnetic field on these effects is also reported. A suitable working point for an electron tube is chosen according to these observations. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of IEEE Transactions on Electron Devices is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1109/TED.2014.2364926
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      – Code: eng
        Text: English
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        PageCount: 5
        StartPage: 4268
    Subjects:
      – SubjectFull: Field emission cathodes
        Type: general
      – SubjectFull: Electron emission
        Type: general
      – SubjectFull: Ferroelectric crystals
        Type: general
      – SubjectFull: Magnetic fields
        Type: general
      – SubjectFull: Electric breakdown
        Type: general
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      – TitleFull: Ferroelectric Cathode Electron Emission Dependence on Magnetic Field.
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              Text: Dec2014
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              Y: 2014
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