A compact low-trigger-threshold multigap gas switch

Jiang, Xiaofeng; Jiang, Hongyu; Wang, Zhiguo; Sun, Fengju; Qiu, Aici

doi:10.1063/1.5113704

Cited by 6 publications

(2 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is due to the fact that the self-breakdown voltage characteristics of the multi gap switch in which the voltage graded by the corona current is highly dependent on the corona current characteristics [3]. It is known that a multi gap switch using corona discharge has a somewhat lower self-break voltage characteristic than the multi gap switch where a solid resistance grades voltage to the gaps [9,10]. This is because the actual resistance value (2) U b = 242.2pd + 19.9 √ pd, formed in the electrode gap by the corona current is a variable that has a unique transient characteristic and changes non-linearly as the charging voltage increases, so that the voltage could not be uniformly distributed to the electrode gaps.…”

Section: Breakdown Characteristics Of Mrgs and Mgsmentioning

confidence: 99%

“…This switch design has a lifetime of more than 10,000 cycles and low operating pressure and low jitter at low trigger voltage by grading the charge voltage to the gaps by corona discharge and forming multi-channels in gaps, [3,4]. This has been applied to switches of many LTD systems in the development stages [7,8], and several research results have been reported improved performance of the switch by adding design changes and circuit elements for performance optimization [9,10]. However, relatively large physical size and the resulting high inductance remain a factor to be improved.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of a new compact multi-channel multi-rail gap switch for linear transformer drivers

Hong

Chung

2021

J. Korean Phys. Soc.

View full text Add to dashboard Cite

A multi-channel multi-railgap spark switch (MRGS) is developed for linear transformer drivers(LTD) with high operating reliability and low circuit inductance. The switch has a multi-rail gap structure using a compact rectangular insulated case and rod-shaped electrodes with corona discharge for voltage balance, which (1) achieves miniaturization by making the switch flat, (2) ensures capacitors and the switch being compactly connected, and (3) reduces the cross-sectional area of the discharge current loop in the LTD discharge circuit, while maintaining a wide and flat current path in the switch section. To verify the operational reliability and performance of the new switch design, self-breakdown voltage and jitter have been experimentally characterized along with inductance reduction effect. Experimental results of this new MRGS are also compared with those of a 200 kV multi-gap multi-channel gas spark switch(MGS) used in various LTDs. The jitter was improved by up to about 50% compared to MGS.

show abstract

Section: Breakdown Characteristics Of Mrgs and Mgsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of a new compact multi-channel multi-rail gap switch for linear transformer drivers

Hong

Chung

2021

J. Korean Phys. Soc.

View full text Add to dashboard Cite

show abstract

A gas-insulated mega-ampere-class linear transformer driver with pluggable bricks

Jiang

Sun

Wang

et al. 2020

Review of Scientific Instruments

View full text Add to dashboard Cite

This paper presents the design and test of a gas-insulated linear transformer driver (LTD) cavity aimed at the Z-pinch experimental device CZ-34. The LTD cavity has a diameter of 2290 mm and a height of 346 mm. It consists of 23 main bricks and 1 trigger brick. Each main brick is comprised of two 100 nF capacitors connected electrically in series with a field-distortion gas switch. The trigger brick is comprised of two 50 nF capacitors connected in series with a compact multi-gap gas switch. All bricks are placed in the cavity filled with compressed SF6 and are pluggable like drawers. The trigger pulse generated by the trigger brick passes through an azimuthal transmission line to the trigger ring and makes the main bricks discharge synchronously. The LTD cavity can deliver ∼1 MA current pulse with a rise time of 115 ns to 0.08 Ω liquid resistance load when the charging voltage is ±100 kV, which is in good agreement with the circuit simulation results. Experimental results demonstrate the successful application of using gas insulation and pluggable bricks. The technical feasibility of the charging configuration, triggering method, and isolation resistors is verified. There is little difference in output performance as return-current rods replaced the outside metal cylinder, which provides a new path for the design of LTD cavities in series.

show abstract

Study on discharge characteristics of six-gap gas switch with corona assisted triggering

Jiang

Wang

et al. 2023

Review of Scientific Instruments

View full text Add to dashboard Cite

To improve the triggering characteristics of the gas switch used for linear transformer driver, a method of corona assisted triggering based on the pre-ionization in switch gaps is proposed and applied to a six-gap gas switch. The principle is demonstrated by electrostatic field analysis and verified by the experimental study on the discharge characteristics of the gas switch. The results indicate that when the gas pressure is 0.3 MPa, the self-breakdown voltage remains about ±80 kV, and its dispersivity is lower than 3%. The effect of corona assisted triggering on the triggering characteristics increases with the higher permittivity of the inner shield. The positive trigger voltage of the switch with the proposed method can be reduced from 110 to 30 kV at a charging voltage of ±80 kV when the jitter is equal to that of the original switch. There are no pre-fire or late-fire when the switch operates continuously for 2000 shots.

show abstract

A compact low-trigger-threshold multigap gas switch

Cited by 6 publications

References 6 publications

Characterization of a new compact multi-channel multi-rail gap switch for linear transformer drivers

Characterization of a new compact multi-channel multi-rail gap switch for linear transformer drivers

A gas-insulated mega-ampere-class linear transformer driver with pluggable bricks

Study on discharge characteristics of six-gap gas switch with corona assisted triggering

Contact Info

Product

Resources

About