Transverse-flow 50-kV trigatron switch for 100-pps burst-mode operation

Beverly, Robert; Campbell, R. N.

doi:10.1063/1.1146901

Cited by 20 publications

(4 citation statements)

References 13 publications

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“…[1][2][3][9][10][11] When the volts are applied, initiated electrons emit from the cathode. These electrons are accelerated and move to the anode or trigger pin caused by the E-field, which in turn leads to electron collisions and avalanches.…”

Section: Theoretical Analysismentioning

confidence: 99%

Modeling of switching delay in gas-insulated trigatron spark gaps

et al. 2012

Journal of Applied Physics

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Articles you may be interested inSlightly uneven electric field trigatron employed in tens of microseconds charging time Rev. Sci. Instrum. 85, 093507 (2014); 10.1063/1.4895831 Energy loss in spark gap switches Phys. Plasmas 21, 043513 (2014); 10.1063/1.4873706Effect of the gap on discharge characteristics of the three-electrode trigatron switch A simple ultraviolet radiation-triggered switch with an electric field distortion gap for long-lifetime electrodes Rev.Based on the gas discharge theory involving distorted E-field enhancement, a physical model is proposed to estimate the switching delay for gas-insulated trigatron spark gaps with a trigger pin inside the main electrode. Two discovered breakdown modes, i.e., fast-breakdown mode (FBM) and slow-breakdown mode (SBM), can be unified in this model. Raether criterion can distinguish these two modes. If the main E-field and enhanced E-field near the trigger pin tip are great enough, FBM forms easily. Otherwise, if streamer development needs to rely on the second ionization process and relevant distorted E-field enhancement, the breakdown of the main gap would turn into SBM. The enhanced E-field near the trigger pin tip may affect the threshold main E-field of FBM. The distorted E-field enhancement may affect the switching delay length of SBM. V C 2012 American Institute of Physics. [http://dx.

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Section: Theoretical Analysismentioning

confidence: 99%

Modeling of switching delay in gas-insulated trigatron spark gaps

et al. 2012

Journal of Applied Physics

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“…The inductance of the switch is <20 nH. During the repetitive mode of operation, to avoid the lowering of self breakdown voltage and to maintain rapid recovery of the spark gap switch, a minimum nitrogen (N 2 ) gas flow rate of 4-40 LPM [18,19] was maintained during the 1-10 Hz device operation to flush out hot spark residue after each discharge.…”

Section: Methodsmentioning

confidence: 99%

Realization of enhancement in time averaged neutron yield by using repetitive miniature plasma focus device as pulsed neutron source

Verma¹,

Rawat²,

Lee³

et al. 2009

J. Phys. D: Appl. Phys.

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In this paper, we report the experimental demonstration of enhancement in time averaged neutron yield by an order of magnitude, using the fast miniature plasma focus FMPF-2 in repetitive mode. The newly developed FMPF-2 device (2.4 µF, 56 nH, 13.8 kV, T/4 ∼ 575 ns) operates up to 10 Hz in the quasi-continuous mode. Using pure deuterium as the fuelling gas, the time averaged neutron output of (6.2 ± 4) × 105 neutrons s−1 at 1 Hz operation was enhanced to (6.5 ± 0.6) × 106 neutrons s−1 at 10 Hz operation for the burst length of 30 consecutive shots. The stability in neutron emission in repetitive mode of operation from 1 to 10 Hz has also been investigated and the evidenced consequential issues of critical concern that are responsible for degradation in neutron yield during the repetitive mode of operation have been highlighted.

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“…ST Accel. Beams 12, 080401 (2009) 080401-3 difficulty meeting the reliability and jitter requirements for this application simultaneously [20][21][22]. Field distortion switches [9,18,[23][24][25] are used in systems requiring both low prefire rate and low jitter.…”

Section: Electrically Triggered High-pressure Gas Switchesmentioning

confidence: 99%

High reliability low jitter 80 kV pulse generator

Savage

Stoltzfus

2009

Phys. Rev. ST Accel. Beams

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Switching can be considered to be the essence of pulsed power. Time accurate switch/trigger systems with low inductance are useful in many applications. This article describes a unique switch geometry coupled with a low-inductance capacitive energy store. The system provides a fast-rising high voltage pulse into a low impedance load. It can be challenging to generate high voltage (more than 50 kilovolts) into impedances less than 10 , from a low voltage control signal with a fast rise time and high temporal accuracy. The required power amplification is large, and is usually accomplished with multiple stages. The multiple stages can adversely affect the temporal accuracy and the reliability of the system. In the present application, a highly reliable and low jitter trigger generator was required for the Z pulsed-power facility IEEE Pulsed Power Conference, Albuquerque, NM (IEEE, Piscataway, NJ, 2007), p. 979]. The large investment in each Z experiment demands low prefire probability and low jitter simultaneously. The system described here is based on a 100 kV DC-charged high-pressure spark gap, triggered with an ultraviolet laser. The system uses a single optical path for simultaneously triggering two parallel switches, allowing lower inductance and electrode erosion with a simple optical system. Performance of the system includes 6 ns output rise time into 5:6 , 550 ps one-sigma jitter measured from the 5 V trigger to the high voltage output, and misfire probability less than 10 À4 . The design of the system and some key measurements will be shown in the paper. We will discuss the design goals related to high reliability and low jitter. While reliability is usually important, and is coupled with jitter, reliability is seldom given more than a qualitative analysis (if any at all). We will show how reliability of the system was calculated, and results of a jitter-reliability tradeoff study. We will describe the behavior of sulfur hexafluoride as the insulating gas in the mildly nonuniform field geometry at pressures of 300 to 500 kPa. We will show the resistance of the arc channels, and show the performance comparisons with normal two-channel operation, and single channel operation.

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Transverse-flow 50-kV trigatron switch for 100-pps burst-mode operation

Cited by 20 publications

References 13 publications

Modeling of switching delay in gas-insulated trigatron spark gaps

Modeling of switching delay in gas-insulated trigatron spark gaps

Realization of enhancement in time averaged neutron yield by using repetitive miniature plasma focus device as pulsed neutron source

High reliability low jitter 80 kV pulse generator

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