Research on spherical graphite cast iron electrode based gas switch

Wei Shang; Jiancang Su; Bo Zeng; Rui Li; Gang Wang; Jie Cheng; Yongdong Li; Mingzhu Gao; Binxiong Yu

doi:10.11884/HPLPB202436.240141

High Power Laser and Particle Beams, Volume. 36, Issue 11, 115014(2024)

Research on spherical graphite cast iron electrode based gas switch

Wei Shang^1,2,3, Jiancang Su^1,2、*, Bo Zeng^1,2, Rui Li^1,2, Gang Wang^1,2, Jie Cheng^1,2,3, Yongdong Li³, Mingzhu Gao^1,2, and Binxiong Yu^1,2

Author Affiliations

¹Northwest Institute of Nuclear Technology, Xi’an 710024, China

²Key Laboratory of Advanced Science and Technology on High Power Microwave, Xi’an 710024, China

³Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China

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Figures & Tables(13)

Fig. 1. SEM image of QT500-spherical graphite cast iron and 316L stainless steel

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Fig. 2. Field emission electron image of QT500-spherical graphite cast iron and 316L stainless steel

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Fig. 3. Electric field diagram of tested gas switch

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Fig. 4. Cumulative distribution function of gas discharge for typical gas gap (SF₆, 0.9 MPa)

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Fig. 5. Comparison of breakdown jitter along typical gas gaps (SF₆, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 MPa)

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Fig. 6. Field emission electron stability test under vacuum

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Fig. 7. Self-breakdown voltage test of N₂ gas switch

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Fig. 8. Electric field distribution of spherical graphite cast iron equal breakdown probability gas switch (V=−1 MV)

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Fig. 9. Electrostatic simulation for multi-stage spherical graphite cast iron gas switch

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Fig. 10. Typical waveform of gas switch for Tesla pulse generator

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Fig. 11. Evolution of breakdown voltage and jitter for spherical graphite cast iron gas switch under 300 000 pulses test

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Table 1. Comparison of material properties between spherical graphite cast iron and stainless steel

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Table 1. Comparison of material properties between spherical graphite cast iron and stainless steel

material	mass fraction/%	tensile strength/MPa	yield strength/MPa	thermal conductivity/(W∙m⁻¹∙K⁻¹)	melting point/℃	hardness/HB	metallographic structure
QT500	C: 3.55～3.85; Si: 2.34～2.86 Mn,S,P,Mg: 0.02～0.04RE: 0.03～0.05	≥500	≥320	35.7	1200～1300	170～230	austenitic stainless steel
316L	C: ≤0.03; Si: ≤1.00;Mn: ≤2.00; S: ≤0.03;P: ≤0.045; Mo: 2.00～3.00	≥480	≥177	16.3	1375～1450	≤187	ferrite+pearlite

Table 2. Basic structure of 4 experimental groups

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Table 2. Basic structure of 4 experimental groups

experiment group	electrode structure	electric field enhancement f	cathode material	anode material
group 1	annular spherical	1.1	316L	316L
group 2	blade-plane	3.6	316L	316L
group 3	annular spherical	1.1	QT500	QT500
group 4	annular spherical	1.1	QT500	316L

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Wei Shang, Jiancang Su, Bo Zeng, Rui Li, Gang Wang, Jie Cheng, Yongdong Li, Mingzhu Gao, Binxiong Yu. Research on spherical graphite cast iron electrode based gas switch[J]. High Power Laser and Particle Beams, 2024, 36(11): 115014

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Paper Information

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Received: Apr. 27, 2024

Accepted: Aug. 27, 2024

Published Online: Jan. 8, 2025

The Author Email: Jiancang Su (sujiancang@nint.ac.cn)

DOI:10.11884/HPLPB202436.240141

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology