IP Library › Granted Patent US 12,696,372
Granted Patent B2
US 12,696,372 · App. 18/662,425 · Granted Jul 28, 2026

Methods and devices for pressurization of pulsed-power drivers

Inventors: Vahid Damideh (Napierville, CA); Jean-Christoph Btaiche (Palo Alto, CA); Alexei Akoulov (Napierville, CA); Isaac Hassen (Napierville, CA)
Assignee: FUSE ENERGY TECHNOLOGIES CORP.
H05H1/46H05H1/16
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Quick Facts
Patent No.
US 12,696,372
App. No.
18/662,425
Granted
Jul 28, 2026
Kind
B2
Abstract

Methods and devices for pressurization of a pulsed-power driver are presented. According to one aspect, independent pressurization of gas switches for each stage of the pulsed-power driver is provided. Independent pressurization is provided via an air delivery system comprising a plurality of separate stage-specific air delivery subsystems. Each air delivery subsystem is further segmented according to a plurality of sectors, each sector configured to pressurize a group of gas switches. Gas switches of a group of axially adjacent stages are pressurized according to a pressurization profile that increases or decreases the pressure in a downstream direction of the driver. Gas switches of another group of axially adjacent stages are pressurized according to a constant/fixed pressure. The increasing pressurization profile to self-triggered stages reduces misfiring of the stages. The increasing/decreasing pressurization profile to self-triggered stages and the constant pressurization to externally triggered stages control a pulse shape output by the driver.

Claims (68)

1 . A pulsed-power driver with independent stage pressurization, comprising:

a voltage adder assembly comprising a plurality of stages axially distributed along a longitudinal driver axis from an upstream end to a downstream end of the pulsed-power driver, each stage of the plurality of stages comprising a respective plurality of gas switches arranged within an oil section of the voltage adder assembly; and

an air delivery system comprising a plurality of air delivery subsystems, each air delivery subsystem configured to pressurize the respective plurality of gas switches of a respective stage of the plurality of stages with a stage-specific pressure.

2 . The pulsed-power driver with independent stage pressurization of claim 1 , wherein:

each air delivery subsystem of the plurality of air delivery subsystems pressurizes the respective plurality of gas switches independently from another air delivery subsystem of the plurality of air delivery subsystems.

3 . The pulsed-power driver with independent stage pressurization of claim 1 , wherein:

each air delivery subsystem of the plurality of air delivery subsystems is segmented according to a plurality of sectors, each sector configured to pressurize a respective group of gas switches of the respective plurality of gas switches.

4 . The pulsed-power driver with independent stage pressurization of claim 3 , wherein:

the respective group of gas switches comprises radially adjacent gas switches.

5 . The pulsed-power driver with independent stage pressurization of claim 1 , wherein:

respective stage-specific pressures associated to a first group of axially adjacent stages of the plurality of stages are according to a constant pressurization profile.

6 . The pulsed-power driver with independent stage pressurization of claim 5 , wherein:

respective stage-specific pressures associated to a second group of axially adjacent stages of the plurality of stages are according to an increasing pressurization profile from the upstream end to the downstream end.

7 . The pulsed-power driver with independent stage pressurization of claim 6 , wherein:

the first group of axially adjacent stages is axially adjacent the second group of axially adjacent stages.

8 . The pulsed-power driver with independent stage pressurization of claim 6 , wherein:

the first group of axially adjacent stages comprises some or all externally triggered stages of the plurality of stages, and

the second group of axially adjacent stage comprises any remaining externally triggered stages and self-triggered stages of the plurality of stages.

9 . The pulsed-power driver with independent stage pressurization of claim 8 , wherein:

the constant pressurization profile is according to a constant pressure that is in a range from 0 psi to 200 psi, and

the increasing pressurization profile is according to pressure steps that includes at least one positive non-zero pressure step.

10 . The pulsed-power driver with independent stage pressurization of claim 5 , wherein:

respective stage-specific pressures associated to a second group of axially adjacent stages of the plurality of stages are according to a decreasing pressurization profile from the upstream end to the downstream end.

11 . The pulsed-power driver with independent stage pressurization of claim 10 , wherein:

the first group of axially adjacent stages is axially adjacent the second group of axially adjacent stages.

12 . The pulsed-power driver with independent stage pressurization of claim 10 , wherein:

the first group of axially adjacent stages comprises some or all externally triggered stages of the plurality of stages, and

the second group of axially adjacent stages comprises any remaining externally triggered stages and self-triggered stages of the plurality of stages.

13 . The pulsed-power driver with independent stage pressurization of claim 12 , wherein:

the constant pressurization profile is according to a constant pressure that is in a range from 0 psi to 200 psi, and

the decreasing pressurization profile is according to pressure steps that includes at least one negative non-zero pressure step.

14 . The pulsed-power driver with independent stage pressurization of claim 13 , wherein:

the at least one negative non-zero pressurisation step represents a pressure change of up to 20%.

15 . The pulsed-power driver with independent stage pressurization of claim 1 , wherein:

the at least one positive non-zero pressure step represents a pressure change up to 20%.

16 . A method for reducing misfiring in a pulsed-power driver, the method comprising:

independently pressurizing gas switches of each stage of a plurality of stages of the pulsed-power driver;

based on the independently pressurizing, pressurizing gas switches of self-triggered stages of the plurality of stages according to an increasing pressurization profile from an upstream end to a downstream end of the pulsed-power driver, and

based on the increasing pressurization profile, increasing respective breakdown voltages of the gas switches of the self-triggered stages, thereby reducing misfiring of the self-triggered stages.

17 . The method according to claim 16 , further comprising:

based on the independently pressurizing, pressurizing gas switches of externally triggered stages of the plurality of stages according to a constant pressurization profile.

18 . A method for controlling shape of an output pulse of a pulsed-power driver, the method comprising:

independently pressurizing gas switches of each stage of a plurality of stages of the pulsed- power driver;

based on the independently pressurizing,

pressurizing gas switches of externally triggered stages of the plurality of stages according to a constant pressurization profile, and

pressurizing gas switches of self-triggered stages of the plurality of stages according to an increasing pressurization profile from an upstream end to a downstream end of the pulsed-power driver, and

based on the constant and increasing pressurization profiles, reducing a rise time and a full width at half maximum of the output pulse.

19 . The method according to claim 18 , wherein:

the constant pressurization profile is according to a constant pressure that is equal to about 0-200 psi, and

the increasing pressurization profile is according to pressure steps that include at last one positive non-zero pressure step.

20 . The method according to claim 18 , further comprising:

triggering the externally triggered stages;

based on the triggering, self-triggering of the self-triggered stages, thereby generating the output pulse;

refreshing gas content of the gas switches of each stage of a plurality of stages;

based on the refreshing, independently pressurizing gas switches of each stage of the plurality of stages of the pulsed-power driver;

based on the independently pressurizing,

pressurizing gas switches of the externally triggered stages according to a constant pressurization profile, and

pressurizing gas switches of the self-triggered stages according to a decreasing pressurization profile from an upstream end to a downstream end of the pulsed-power driver, and

based on the constant and decreasing pressurization profiles, increasing a rise time and a full width at half maximum of the output pulse.

21 . A method for controlling a shape of an output pulse of a pulsed-power driver, the method comprising:

independently pressurizing gas switches of each stage of a plurality of stages of the pulsed- power driver;

based on the independently pressurizing,

pressurizing gas switches of externally triggered stages of the plurality of stages according to a constant pressurization profile, and

pressurizing gas switches of self-triggered stages of the plurality of stages according to a decreasing pressurization profile from an upstream end to a downstream end of the pulsed-power driver, and

based on the constant and decreasing pressurization profiles, increasing a rise time and a full width at half maximum of the output pulse.

22 . The method according to claim 21 , wherein:

the constant pressurization profile is according to a pressure that is equal to about 0-200 psi, and

the decreasing pressurization profile is according to pressure steps that includes at least one negative non-zero pressure step.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 5, 2024
From: DAMIDEH, VAHID; BTAICHE, JEAN-CHRISTOPH; AKOULOV, ALEXEI; HASSEN, ISAAC
To: FUSE ENERGY TECHNOLOGIES CORP.
Reel/Frame 067634/0619 →
Continuity (1)
Related Publication 20250351258A1 · Nov 13, 2025
References Cited (61)
US 4893089A · Villa · 1990 [cited by examiner]
US 7679297B1 · Stygar · 2010 [cited by examiner]
US 9000625B1 · Kim · 2015 [cited by examiner]
US 10539122B2 · Yamazaki · 2020 [cited by examiner]
US 10832894B2 · McClelland · 2020 [cited by examiner]
US 11337296B2 · Huh · 2022 [cited by examiner]
US 11697032B2 · Sampayan · 2023 [cited by examiner]
US 12097390B2 · Sampayan · 2024 [cited by examiner]
US 20090278054A1 · Kamarehi · 2009 [cited by examiner]
US 20150214011A1 · Kaneko · 2015 [cited by examiner]
US 20190319432A1 · Liao · 2019 [cited by examiner]
US 20200288561A1 · Huh · 2020 [cited by examiner]
US 20240079151A1 · Golingo · 2024 [cited by examiner]
US 20240153662A1 · Harris · 2024 [cited by examiner]
US 20240312762A1 · Steele · 2024 [cited by examiner]
US 20240429813A1 · Damideh · 2024 [cited by examiner]
Auluck, S. et al. “Update on the Scientific Status of the Plasma Focus”. Plasma 4, 450-669 (2021). [cited by applicant]
Avaria, G. et al. “Bayesian inference of spectrometric data and validation with numerical simulations of plasma sheath diagnostics of a plasma focus discharge”. Sci Rep 12, 15601, pp. 1-12 (2022). [cited by applicant]
Awe, T. J. et al. “Observations of Modified Three-Dimensional Instability Structure for Imploding Z-Pinch Liners that are Premagnetized with an Axial Field”. Phys Rev Lett 111, 235005, pp. 1-5. (2013). [cited by applicant]
Bhartiya, P. et al. “Pulsed 3.5 GHz high power microwaves irradiation on physiological solution and their biological evaluation on human cell lines”. Sci Rep 11, 8475, pp. 1-16. (2021). [cited by applicant]
Chen, L. et al. “Development of a fusion-oriented pulsed power module”. Physical Review Accelerators and Beams 22, 030401, pp. 1-15 (2019). [cited by applicant]
Conti, F. et al. “MA-class linear transformer driver for z-pinch research”. Physical Review Accelerators and Beams 23, 090401, pp. 1-15 (2020). [cited by applicant]
Damideh, V. et al. “Characteristics of Fast ion beam in Neon and Argon filled plasma focus correlated with Lee Model Code”. Vacuum 169, 108916, pp. 1-6 (2019). [cited by applicant]
David L. Smith, M. E. S. ZR “Marx capacitor lifetime test results”. in Conference Record of the Twenty-Sixth International Power Modulator Symposium, 2004 and 2004 High-Voltage Workshop. 530-533 (IEEE). doi:10.1109/MODS… [cited by applicant]
Engelbrecht, J. T. et al. “Initial conditions in the hawk dense plasma focus”. in 2019 IEEE Pulsed Power & Plasma Science (PPPS) 1-5 (IEEE, 2019). doi:10.1109/PPPS34859.2019.9009625. [cited by applicant]
Esplen, N. et al. “Dosimetric characterization of a novel UHDR megavoltage X-ray source for Flash radiobiological experiments”. Sci Rep 14, 822, pp. 1-14 (2024). [cited by applicant]
Faenov, A. Y. et al. “Advanced high resolution x-ray diagnostic for HEDP experiments”. Sci Rep 8, 16407, pp. 1-9 (2018). [cited by applicant]
Gomez, M. R. et al. “Performance Scaling in Magnetized Liner Inertial Fusion Experiments”. Phys Rev Lett 125, 155002, pp. 1-7 (2020). [cited by applicant]
Gribkov, V. A. et al. “Plasma dynamics in the PF-1000 device under full-scale energy storage: II. Fast electron and ion characteristics versus neutron emission parameters and gun optimization perspectives”. J Phys D App… [cited by applicant]
Hadjisolomou, P., Jeong, T. M. & Bulanov, S. V. “Towards bright gamma-ray flash generation from tailored target irradiated by multi-petawatt laser”. Sci Rep 12, 17143, 1-11 (2022). [cited by applicant]
Hofstra Group, “Triggered Spark Gap Design,” Downloaded from the web on May 10, 2024, from: https://hofstragroup.com/triggered-spark-gap-design.html#:~:text=Changing%20the%20voltage%20of%20the,%3A%20field%2Ddistortion%2… [cited by applicant]
Kang, Y., et al., “Principal Dynamic Mode Analysis of EEG Data for Assisting the Diagnosis of Alzheimer's Disease,” IEEE J Transl Eng Health Med. Feb. 5, 2015;3:1800110. doi: 10.1109/JTEHM.2015.2401005. PMID: 27170890; … [cited by applicant]
Kim, A. A. et al. “Development and tests of fast 1-MA linear transformer driver stages”. Physical Review Special Topics—Accelerators and Beams 12, 050402, pp. 1-10 (2009). [cited by applicant]
LeChien, K. et al. A 1-MV, 1-MA, 0.1-Hz linear transformer driver utilizing an internal water transmission line. in 2009 IEEE Pulsed Power Conference 1186-1191 (IEEE, 2009). doi:10.1109/PPC.2009.5386430. 6 pages. [cited by applicant]
LeChien, K. R. et al. “Sirius I: Prototype of a Prime-Power Source for Future 1—10 GJ Fusion-Yield Experiments”. 14 pages. (2023). [cited by applicant]
Lee, S., Damideh, V. & Btaiche, J. C. “MagLIF: Dynamics and energetics of liner and fuel”. Vacuum 216, 112471, pp. 1-11 (2023). [cited by applicant]
Lu, Y. et al. “A compact platform for the investigation of material dynamics in quasi-isentropic compression to ~ 19 GPa”. Sci Rep 11, 20688, pp. 1-12 (2021). [cited by applicant]
Mehlhorn, T. A. “National Security Research in Plasma Physics and Pulsed Power: Past, Present, and Future”. IEEE Transactions on Plasma Science 42, 1088-1117 (2014). [cited by applicant]
Min, S.-H. et al. “Effects on electronics exposed to high-power microwaves on the basis of a relativistic backward-wave oscillator operating on the X-band”. J Electromagn Waves Appl 31, 1875-1901 (28 pages) (2017). [cited by applicant]
Nowak, M. “The concept of a new two-stage fuse for high power pulse forming”. Sci Rep 12, 18176, pp. 1-18 (2022). [cited by applicant]
Obenschain, S. et al. “High-energy krypton fluoride lasers for inertial fusion”. Appl Opt 54, F103-F122 (2015). [cited by applicant]
Owens, I. et al. “Electro-optical measurement of intense electric field on a high energy pulsed power accelerator”. Sci Rep 11, 10702, pp. 1-7 (2021). [cited by applicant]
R Jagan Mohan Rao, “What is a Capacitor Bank,” Inst Tool. Downloaded from the web on May 6, 2024, from: https://instrumentationtools.com/what-is-a-capacitor-bank/. 11 pages. [cited by applicant]
Savage, M. E. et al.“Pulsed power performance of the Z machine: Ten years after the upgrade”. in 2017 IEEE 21st International Conference on Pulsed Power (PPC) 1-6 (IEEE, 2017). doi:10.1109/PPC.2017.8291252. [cited by applicant]
Schmidt, A. et al. “First Experiments and Radiographs on the MegaJOuLe Neutron Imaging Radiography (MJOLNIR) Dense Plasma Focus”. IEEE Transactions on Plasma Science 49, 3299-3306 (2021). pp. 1-8 (10 pages) (LLNL-JRNL-8… [cited by applicant]
Sinars, D. B. et al. “Review of pulsed power-driven high energy density physics research on Z at Sandia”. Phys Plasmas 27, 070501, pp. 1-26 (2020). [cited by applicant]
Sohrabi, M., Zarinshad, A. & Habibi, M. “Breakthrough in 4π ion emission mechanism understanding in plasma focus devices”. Sci Rep 6, 38843, pp. 1-15 (2016). [cited by applicant]
Spielman, R. B. et al. “Conceptual design of a 15-TW pulsed-power accelerator for high-energy-density-physics experiments”. Matter and Radiation at Extremes 2, 204-223 (2017). [cited by applicant]
Sporer, B. J. et al. “Multicavity linear transformer driver facility for z-pinch and high-power microwave research”. Physical Review Accelerators and Beams 24, 100402, p. 1-13 (2021). [cited by applicant]
Stygar, W. A. et al. “Architecture of petawatt-class z-pinch accelerators”. Physical Review Special Topics—Accelerators and Beams 10, 030401, pp. 1-24 (2007). [cited by applicant]
Stygar, W. A. et al. “Conceptual designs of two petawatt-class pulsed-power accelerators for high-energy-density-physics experiments”. Physical Review Special Topics—Accelerators and Beams 18, 110401, pp. 1-30 (2015). [cited by applicant]
Stygar, W. A. et al.“Impedance-matched Marx generators”. Physical Review Accelerators and Beams 20, 040402, pp. 1-16 (2017). [cited by applicant]
Stygar, W. et al. “Conceptual design of a 960-TW accelerator powered by impedance-matched Marx generators”. in 2017 IEEE 21st International Conference on Pulsed Power (PPC) 1-8 (IEEE, 2017). doi:10.1109/PPC.2017.8291256. [cited by applicant]
Valenzuela, J. C. et al. “Measurement of temperature and density using non-collective X-ray Thomson scattering in pulsed power produced warm dense plasmas”. Sci Rep 8, 8432, pp. 1-8 (2018). [cited by applicant]
Venkata Ramudu, B., Reddy, C. J. & Madhu, V. “Flash X-ray radiography technique to study the high velocity impact of soft projectile on E-glass/epoxy composite materia” l. Defence Technology 15, 216-226 (2019). [cited by applicant]
Wikipedia. “Linear transformer driver”. Downloaded on May 6, 2024, from: https://en.wikipedia.org/wiki/Linear_transformer_driver. 3 pages. [cited by applicant]
Wikipedia. “Marx generator”. Downloaded on May 6, 2024, from: https://en.wikipedia.org/wiki/Marx_generator. 6 pages. [cited by applicant]
Wurden, G. A. et al. “Magneto-Inertial Fusion”. Journal of Fusion Energy 35, 69-77 (2016). [cited by applicant]
Yager-Elorriaga, D. A et al. “An overview of magneto-inertial fusion on the Z machine at Sandia National Laboratories”. Nuclear Fusion 62, 042015, pp. 1-19 (2022). [cited by applicant]
Zylstra, A. B. et al. “Burning plasma achieved in inertial fusion”. Nature 601, 542-548 (2022). [cited by applicant]
International Search Report and Written Opinion mailed Jul. 16, 2025, in PCT Application No. PCT/US2025/028738. [cited by applicant]