Electron beam current in high power cylindrical diode

Roy, Amitava; Menon, R.; Mitra, S.; Sharma, Vishnu; Singh, Sandeep; Nagesh, K. V.; Chakravarthy, D. P.

doi:10.1063/1.3292655

Cited by 10 publications

(3 citation statements)

References 21 publications

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“…Approximate generalization of the Langmuir-Blodgett law for the relativistic regime is given in Zhang et al (2009). Electron beam generation studies were carried out by Roy et al (2009) in high power cylindrical diode in order to investigate the effect of the accelerating gap and diode voltage on the electron beam current. The diode voltage has been varied in Roy et al (2009) from 130 to 356 kV, whereas the current density has been varied from 87 to 391 A/cm 2 with 100 ns pulse duration.…”

Section: Diagnosticsmentioning

confidence: 99%

“…The diode voltage has been varied in Roy et al (2009) from 130 to 356 kV, whereas the current density has been varied from 87 to 391 A/cm 2 with 100 ns pulse duration. It was shown in Roy et al (2009) that diode voltage and current do not follow the bipolar space-charge limited flow and beam current is not enhanced by a factor of 1.86 even though there is some formation of anode plasma. It agrees well with our experiments.…”

Section: Diagnosticsmentioning

confidence: 99%

“…Electron beam generation studies were carried out by Roy et al (2009) in high power cylindrical diode in order to investigate the effect of the accelerating gap and diode voltage on the electron beam current. The diode voltage has been varied in Roy et al (2009) from 130 to 356 kV, whereas the current density has been varied from 87 to 391 A/cm 2 with 100 ns pulse duration. It was shown in Roy et al (2009) that diode voltage and current do not follow the bipolar space-charge limited flow and beam current is not enhanced by a factor of 1.86 even though there is some formation of anode plasma.…”

Section: Diagnosticsmentioning

confidence: 99%

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Electron-beam accelerator for pumping of a Xe₂ lamp

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A high-current electron-beam accelerator for pumping of a Xe 2 lamp was developed. It is intended for injection of an electron beam into cylindrical gas cavity (diameter of 400 mm, length of 1600 mm, and the absolute pressure up to 3 bars). Two electron diodes in parallel are used in the accelerator. Each diode is connected to a linear transformer driver with vacuum insulation of a secondary turn. The next parameters of the accelerator have been obtained: diode voltage -550-600 kV, diode current -276-230 kA, current rise time -160 ns, maximum power of the electron beam -130 GW, pulse width on half maximum -160 ns, electron beam energy at power level not less than half of maximum value -20 kJ. The total energy of electrons, which pass through a 40 μm Ti foil into the Xe cell, is 8-9 kJ in the 150-160 ns pulse (full width at half maximum) mean specific power of energy input into gas cavity is about 330 kW/cm 3 . Design of the accelerator and test results are presented and discussed in this paper.

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Section: Diagnosticsmentioning

confidence: 99%

Section: Diagnosticsmentioning

confidence: 99%

Section: Diagnosticsmentioning

confidence: 99%

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Electron-beam accelerator for pumping of a Xe₂ lamp

et al. 2012

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High power microwave generation from coaxial virtual cathode oscillator using graphite and velvet cathodes

Menon

Roy

Singh

et al. 2010

Journal of Applied Physics

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High power microwave (HPM) generation studies were carried out in KALI-5000 pulse power system. The intense relativistic electron beam was utilized to generate HPMs using a coaxial virtual cathode oscillator. The typical electron beam parameters were 350 kV, 25 kA, and 100 ns, with a few hundreds of ampere per centimeter square current density. Microwaves were generated with graphite and polymer velvet cathode at various diode voltage, current, and accelerating gaps. A horn antenna setup with diode detector and attenuators was used to measure the microwave power. It was observed that the microwave power increases with the diode voltage and current and reduces with the accelerating gap. It was found that both the peak power and width of the microwave pulse is larger for the velvet cathode compared to the graphite cathode. In a coaxial vircator, velvet cathode is superior to the graphite cathode due to its shorter turn on time and better electron beam uniformity.

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Plasma expansion and impedance collapse in a foil-less diode for a klystronlike relativistic backward wave oscillator

et al. 2010

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Klystronlike relativistic backward wave oscillator (RBWO) can produce microwave power exceeding 5 GW with a high efficiency larger than 40%. In the experiment of klystronlike RBWO, for about 1 MV peak diode voltages, increasing magnetic field from 1.43 to 1.89 T slowed the impedance collapse until it was suppressed completely. The introduction of a stainless steel obstructing ring aggravated the impedance collapse, whereas replacing the stainless steel obstructing ring with a flat stainless steel provided a more stable impedance variation during the pulse duration. These impedance collapses did not affect microwave generation seriously and may be attributed to the radial expansion of cathode plasma initialing from the cathode shank so that part of reverse currents were collected at the anode wall, contributing to the measured diode current. On the other hand, it was found that microwave generation shot-to-shot reproducibility was closely related to the diode impedance variation. When there was no or very low microwave measured, diode impedance collapse appeared at the latter of the pulse. The microwave generation shot-to-shot reproducibility was improved greatly after the electron collector was enlarged on radius with 1 mm. A possible explanation is that the anode plasma produced from electron collector expands axially and enters the diode region at a very high velocity of several mm/ns. The movement of the anode plasma in the beam-wave interaction region affects the microwave generation, which reduces the microwave power during the whole pulse duration significantly.

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Electron beam current in high power cylindrical diode

Cited by 10 publications

References 21 publications

Electron-beam accelerator for pumping of a Xe₂ lamp

Electron-beam accelerator for pumping of a Xe₂ lamp

High power microwave generation from coaxial virtual cathode oscillator using graphite and velvet cathodes

Plasma expansion and impedance collapse in a foil-less diode for a klystronlike relativistic backward wave oscillator

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Electron beam current in high power cylindrical diode

Cited by 10 publications

References 21 publications

Electron-beam accelerator for pumping of a Xe2 lamp

Electron-beam accelerator for pumping of a Xe2 lamp

High power microwave generation from coaxial virtual cathode oscillator using graphite and velvet cathodes

Plasma expansion and impedance collapse in a foil-less diode for a klystronlike relativistic backward wave oscillator

Contact Info

Product

Resources

About

Electron-beam accelerator for pumping of a Xe₂ lamp

Electron-beam accelerator for pumping of a Xe₂ lamp