Dynamics simulation on long pulse high power foilless diode

Fei, 向飞 Xiang; Chunxia, 李春霞 Li; Jie, 谭杰 Tan

doi:10.3788/hplpb20112303.0831

Cited by 3 publications

(2 citation statements)

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“…One ends at the vacuum chamber wall 17,18 and the other crosses the shield hoop. 4,19 Here we take the latter case as the example.…”

Section: Simulation Model and Reverse Current Theorymentioning

confidence: 99%

“…4 A shield hoop is introduced to protect the insulator from the bombardment with the reverse electron beam, otherwise it leads to insulation collapse and energy loss. 7,[17][18][19] Solenoid magnet coils surround the anode tube to provide the guiding magnetic field, in which the whole diode including the cathode region is immersed. The outer radius of the annular cathode is r c with the cathode tip located in z c .…”

Section: Simulation Model and Reverse Current Theorymentioning

confidence: 99%

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Simulative research on reverse current in magnetically insulated coaxial diode

Zhu,

Zhang,

Zhong

et al. 2017

AIP Advances

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Danni Zhu ((朱丹妮)) , Jun Zhang ((张军)), Huihuang Zhong ((钟辉煌)), Lie Liu ((刘列)), and Xingjun Ge ((葛行军)) COLLECTIONS Paper published as part of the special topic on Chemical Physics, Energy, Fluids and Plasmas, Materials Science and Mathematical Physics ARTICLES YOU MAY BE INTERESTED IN Experimental research on time-resolved evolution of cathode plasma expansion velocity in a long pulsed magnetically insulated coaxial diode

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“…One ends at the vacuum chamber wall 17,18 and the other crosses the shield hoop. 4,19 Here we take the latter case as the example.…”

Section: Simulation Model and Reverse Current Theorymentioning

confidence: 99%

Section: Simulation Model and Reverse Current Theorymentioning

confidence: 99%

Simulative research on reverse current in magnetically insulated coaxial diode

Zhu,

Zhang,

Zhong

et al. 2017

AIP Advances

View full text Add to dashboard Cite

show abstract

Current loss of magnetically insulated coaxial diode with cathode negative ion

Zhu¹,

Zhang²,

Zhong³

et al. 2018

Chinese Phys. B

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Current loss without an obvious impedance collapse in the magnetically insulated coaxial diode (MICD) is studied through experiment and particle-in-cell (PIC) simulation when the guiding magnetic field is strong enough. Cathode negative ions are clarified to be the predominant reason for it. Theoretical analysis and simulation both indicate that the velocity of the negative ion reaches up to 1 cm/ns due to the space potential between the anode and cathode gap (A-C gap). Accordingly, instead of the reverse current loss and the parasitic current loss, the negative ion loss appears during the whole pulse. The negative ion current loss is determined by its ionization production rate. It increases with diode voltage increasing. The smaller space charge effect caused by the beam thickening and the weaker radial restriction both promote the negative ion production under a lower magnetic field. Therefore, as the magnetic field increases, the current loss gradually decreases until the beam thickening nearly stops.

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