1 MV ultra-fast LTD generator

Kim, A.A.; Bastrikov, A.N.; Волков, С. Н.; Durakov, V.G.; Kovalchuck, B.; Sinebryukhov, V.A.

doi:10.1109/ppc.2003.1277943

Cited by 26 publications

(14 citation statements)

References 1 publication

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“…Linear transformer drivers (LTDs) are a new pulsedpower architecture that may dramatically reduce the size and cost of high-voltage, high-current pulsed-power accelerators [1][2][3][4][5][6][7]. LTDs, however, place stringent demands on gas switches, requiring switches that can be charged to 200 kV DC, be triggered with a 1-jitter of 5-10 ns, be low inductance, have very low prefire and no-fire rates, and have lifetimes of at least several thousand shots when transferring $400 J of energy per shot.…”

Section: Introductionmentioning

confidence: 99%

New low inductance gas switches for linear transformer drivers

Woodworth

Stygar

Bennett

et al. 2010

Phys. Rev. ST Accel. Beams

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We have developed two new gas switches that are designed to be used with linear transformer drivers. The switches, which can be DC charged to 200 kV and triggered with less than a 2-ns 1-jitter, have overall inductances ranging from 69 to 85 nH. When transferring 400 J of energy per shot, the switches have lifetimes in excess of 5000 shots. The two switches are insulated with 130-270 PSIA of air and are submerged in transformer oil during operation. These switches should allow development of linear transformer drivers that are more compact and have higher peak power.

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Section: Introductionmentioning

confidence: 99%

New low inductance gas switches for linear transformer drivers

Woodworth

Stygar

Bennett

et al. 2010

Phys. Rev. ST Accel. Beams

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“…ises to be, at a given pinch current and implosion time, more efficient and reliable. Seminal work by Kovalchuk et al [80,83,88,92], Bastrikov et al [81,90], Kim et al [74,82,85,87,89,91,94,101], McDaniel and Spielman [84], Mazarakis et al [76,79,86,102], Rose et al [93,100], Vizir et al [95], Leckbee et al [96,97,99], and Rogowski et al [98] have led to impressive advances in LTD technology.…”

Section: Introductionmentioning

confidence: 99%

Architecture of petawatt-classz-pinch accelerators

Stygar

Cuneo

Headley³

et al. 2007

Phys. Rev. ST Accel. Beams

211

128

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We have developed an accelerator architecture that can serve as the basis of the design of petawatt-class z-pinch drivers. The architecture has been applied to the design of two z-pinch accelerators, each of which can be contained within a 104-m-diameter cylindrical tank. One accelerator is driven by slow ( 1 s) Marx generators, which are a mature technology but which necessitate significant pulse compression to achieve the short pulses ( 1 s) required to drive z pinches. The other is powered by linear transformer drivers (LTDs), which are less mature but produce much shorter pulses than conventional Marxes. Consequently, an LTD-driven accelerator promises to be (at a given pinch current and implosion time) more efficient and reliable. The Marx-driven accelerator produces a peak electrical power of 500 TW and includes the following components: (i) 300 Marx generators that comprise a total of 1:8 10 4 capacitors, store 98 MJ, and erect to 5 MV; (ii) 600 water-dielectric triplate intermediate-store transmission lines, which also serve as pulse-forming lines; (iii) 600 5-MV laser-triggered gas switches; (iv) three monolithic radial-transmission-line impedance transformers, with triplate geometries and exponential impedance profiles; (v) a 6-level 5.5-m-diameter 15-MV vacuum insulator stack; (vi) six magnetically insulated vacuum transmission lines (MITLs); and (vii) a triple-post-hole vacuum convolute that adds the output currents of the six MITLs, and delivers the combined current to a z-pinch load. The accelerator delivers an effective peak current of 52 MA to a 10-mm-length z pinch that implodes in 95 ns, and 57 MA to a pinch that implodes in 120 ns. The LTD-driven accelerator includes monolithic radial transformers and a MITL system similar to those described above, but does not include intermediate-store transmission lines, multimegavolt gas switches, or a laser trigger system. Instead, this accelerator is driven by 210 LTD modules that include a total of 1 10 6 capacitors and 5 10 5 200-kV electrically triggered gas switches. The LTD accelerator stores 182 MJ and produces a peak electrical power of 1000 TW. The accelerator delivers an effective peak current of 68 MA to a pinch that implodes in 95 ns, and 75 MA to a pinch that implodes in 120 ns. Conceptually straightforward upgrades to these designs would deliver even higher pinch currents and faster implosions.

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“…The existing LTD cavity design developed at HCEI is used as a baseline for this design [18,7]. The cavities in this design have a 1.75 m outer diameter, a 0.56 m bore diameter, and are 0.22 m thick, see Table 1.…”

Section: Physical Descriptionmentioning

confidence: 99%

“…The LTD architecture discussed in this report was developed at the Institute of High Current Electronics (HCEI) in Tomsk, Russia. Individual LTD cavities have been tested with 10 [7,8], 16 [9,10], 20 [11], and 40 [12,13] parallel bricks. Repetitive testing of a single, high current, 20-brick cavity has been performed at Sandia to investigate lifetime of the LTD components.…”

Section: Introductionmentioning

confidence: 99%

Design of a 7-MV Linear Transformer Driver (LTD) for down-hole flash x-ray radiography.

Cordova¹,

Welch

Oliver³

et al. 2008

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Pulsed power driven flash x-ray radiography is a valuable diagnostic for subcritical experiments at the Nevada Test Site. The existing dual-axis Cygnus system produces images using a 2.25 MV electron beam diode to produce intense x-rays from a small source. Future hydrodynamic experiments will likely use objects with higher areal mass, requiring increased x-ray dose and higher voltages while maintaining small source spot size. A linear transformer driver (LTD) is a compact pulsed power technology with applications ranging from pulsed power flash x-ray radiography to high current Z-pinch accelerators. This report describes the design of a 7-MV dual-axis system that occupies the same lab space as the Cygnus accelerators. The work builds on a design proposed in a previous report [1]. This new design provides increased diode voltage from a lower impedance accelerator to improve coupling to low impedance diodes such as the self magnetic pinch (SMP) diode. The design also improves the predicted reliability by operating at a lower charge voltage and removing components that have proven vulnerable to failure. Simulations of the new design and experimental results of the 1-MV prototype are presented. *

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1 MV ultra-fast LTD generator

Cited by 26 publications

References 1 publication

New low inductance gas switches for linear transformer drivers

New low inductance gas switches for linear transformer drivers

Architecture of petawatt-classz-pinch accelerators

Design of a 7-MV Linear Transformer Driver (LTD) for down-hole flash x-ray radiography.

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