Runtime and Jitter on a Laser-Triggered Spark-Gap Switch

Hutsel, B. T.; Benwell, A.; Kovaleski, Scott D.; Kemp, Mark A.; Sullivan, D.L.; Gahl, J.M.

doi:10.1109/tps.2008.2004237

Cited by 14 publications

(3 citation statements)

References 11 publications

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“…Using lower laser peak power ͑several megawatts͒, the jitter performance is still in tens of nanoseconds ͑peak͒. 31,32 Recently, research groups have reported good results with high peak power laser triggered gas switches. 33,34 In order to get dense enough photoexcited plasma in the conducting channel, the trigger laser has to provide pulses with tens of gigawatt to terawatt peak power that dramatically increases the complexity and the cost of such a system.…”

Section: Kv Pulsed Diode Prototype Electron Sourcementioning

confidence: 99%

Vacuum breakdown limit and quantum efficiency obtained for various technical metals using dc and pulsed voltage sources

Pimpec

Gough

Paraliev

et al. 2010

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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For the SwissFEL project, an advanced high gradient low emittance gun is under development. Reliable operation with an electric field, preferably above 125 MV/m at a 4 mm gap, in the presence of an ultraviolet laser beam, has to be achieved in a diode configuration in order to minimize the emittance dilution due to space charge effects. In the first phase, a dc breakdown test stand was used to test different metals with different preparation methods at voltages up to 100 kV. The authors show that gradient achieved for rough machined (Ra<200 nm) metal electrodes followed by an argon glow plasma are similar to the one obtained using a mirrorlike electrode (Ra<40 nm). In addition, high gradient stability tests were also carried out over several days in order to prove reliable spark-free operation with a minimum dark current. In the second phase, electrodes with selected materials were installed in the 250 ns full width at half maximum, 500 kV electron gun and tested for high gradient breakdown and for quantum efficiency using an ultraviolet laser. Routine electron beam operation, breakdown-free, at 50 MV/m (6 mm gap, 10 Hz repetition rate) at various charges is now achieved using different metal electrodes.

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Section: Kv Pulsed Diode Prototype Electron Sourcementioning

confidence: 99%

Vacuum breakdown limit and quantum efficiency obtained for various technical metals using dc and pulsed voltage sources

Pimpec

Gough

Paraliev

et al. 2010

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

View full text Add to dashboard Cite

show abstract

“…Performance of laser triggered gas switches depends on the properties of the laser trigger pulse. Using lower laser peak power (several MW) the jitter performance is still in tens of nanoseconds (peak) [19,20]. Recently, research groups have reported good results with high peak power laser triggered gas switches [21,22].…”

Section: Kv Pulsed Diode Prototype Electron Sourcementioning

confidence: 99%

Empirical comparison of high gradient achievement for different metals in DC and pulsed mode

Pimpec,

Gough,

Paraliev

et al. 2010

Preprint

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“…The switch closure times have been measured at different pressures, laser energies, laser wavelengths, hold-off voltages, and for the laser light being launched on the switch axis or perpendicular to the switch axis [20][21][22][23][24][25][26]. For repetitively operated spark gaps with conduction current risetimes of 10 12 A/s and cumulative charge transfers of hundreds of coulombs per hour, electrode erosion limits the lifetime of the gas switch [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Low jitter, high voltage, repetitive laser triggered gas switches

Hegeler¹,

Myers

Wolford

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

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The Electra pulsed power system at the Naval Research Laboratory is capable of supplying 16 kJ to a low impedance load within 140 ns, and it allows continuous operation of up to 5 pulses per second for several hours. Four laser triggered SF 6 gas switches transfer the stored pulse forming line energy to the load. Each switch has a hold-off voltage of more than 1 MV and transfers a charge of 10 mC per shot. This paper describes the redesign of the gas switch with hemispherical electrodes to a flat electrode configuration, which led to an improvement in switch reliability. A one sigma switch jitter of ±1.2 ns has been achieved for tens of thousands of continuous shots, with an electrode erosion rate as low as 1 mg/C. Detailed statistical analyses are provided when the switches are operated at a SF 6 pressure of 0.36 -0.69 MPa, with a laser trigger energy of 1 -18 mJ at 266 nm, and a switch hold-off voltage ranging from 0.7 -1.2 MV.

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Runtime and Jitter on a Laser-Triggered Spark-Gap Switch

Cited by 14 publications

References 11 publications

Vacuum breakdown limit and quantum efficiency obtained for various technical metals using dc and pulsed voltage sources

Vacuum breakdown limit and quantum efficiency obtained for various technical metals using dc and pulsed voltage sources

Empirical comparison of high gradient achievement for different metals in DC and pulsed mode

Low jitter, high voltage, repetitive laser triggered gas switches

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