A high-voltage, short-risetime pulse generator based on a ferrite pulse sharpener

Seddon, N.; Thornton, E.

doi:10.1063/1.1139937

Cited by 37 publications

(13 citation statements)

References 3 publications

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“…A possible solution is magnetic compression of the high voltage pulse using saturable ferrite cores. In the past, this method produced pulses in the same voltage range with subnanosecond rise time [21,22]. The advantage of a shorter rise time is that the beam energy will be higher.…”

Section: Discussionmentioning

confidence: 99%

Design and validation of an accelerator for an ultracold electron source

Taban

Reijnders

Bell

et al. 2008

Phys. Rev. ST Accel. Beams

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We describe here a specially designed accelerator structure and a pulsed power supply that are essential parts of a high brightness cold atoms-based electron source. The accelerator structure allows a magnetooptical atom trap to be operated inside of it, and also transmits subnanosecond electric field pulses. The power supply produces high voltage pulses up to 30 kV, with a rise time of up to 30 ns. The resulting electric field inside the structure is characterized with an electro-optic measurement and with an ion timeof-flight experiment. Simulations predict that 100 fC electron bunches, generated from trapped atoms inside the structure, reach an emittance of 0.04 mm mrad and a bunch length of 80 ps.

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Section: Discussionmentioning

confidence: 99%

Design and validation of an accelerator for an ultracold electron source

Taban

Reijnders

Bell

et al. 2008

Phys. Rev. ST Accel. Beams

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show abstract

“…5 The line was formed by a high-voltage cable in which 30 toroidal cores ͑material T-38 from Siemens͒, 5mm-i.d., 10-mm-o.d., and 4-mm-thick were threaded, with the resulting string inserted into a brass tube 18 mm long and 15 mm in diameter. The capacitor can be dc charged up to 15 kV and rapidly discharged through a small, low inductance, self-triggered spark gap on the shock line to produce highvoltage negative pulses of about 2 ns rise time.…”

Section: Switch Designmentioning

confidence: 99%

A simple ultraviolet radiation-triggered switch with an electric field distortion gap for long-lifetime electrodes

Niedbalski

1998

Review of Scientific Instruments

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“…Instead of feeding the Marx generator pulse into 50 ( Figure 5 The input pulse and output pulse produced by the Marx generator and ferrite pulse sharpener. Note change of timebase 1 after Seddon & Thornton (1988) pulse was fed directly into the ferrite line. Also the ferrite line was modified by adding more high voltage insulating sleeving.…”

Section: Sub-nanosecond Risetime High Voltage Pulse Generatormentioning

confidence: 99%

High dV/dT Spiker Pulse Generation Using Magnetic Pulse Sharpening Techniques

Seddon

1989

Pulse Power for Lasers II

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The use of Spiker /sustainer circuitry for exciting excimer lasers is now well established due to its proven high performance. In spiker circuitry reported to date, the rate of rise of spiker voltage incident upon the laser head has been limited by both the turn -on time of the spiker circuit switching element and the spiker circuit inductance. Rise times achieved have generally been limited to between 5Ons and 2Ons depending upon whether a thyratron or rail -gap is used as the principal switching element. This paper will describe an alternative method of generating high voltage pulses whose rise times are no longer limited by the commutation speed of the principal high voltage switch. These pulses are generated in two stages. An initial high voltage pulse with a rise time determined by the principal switching element and circuit geometry is incident upon a ferrite pulse sharpener. This consists of a coaxial transmission line whose inter -conductor region is filled with saturable ferrite material surrounded by high voltage insulation. The pulse drives the ferrite into saturation as it propagates along the cable resulting in the sharpening of the leading edge of the pulse. The rate of rise of the output pulse from the pulse sharpener is determined by the magnitude of the incident voltage pulse, the rate of rise of the incident voltage pulse, the switching constant of the ferrite material and the geometry of the pulse sharpener. Experimentally it has been found that GOns rise time, 20kV pulses incident upon the sharpener are reduced to 2ns rise time pulses after propagating along 2m of cable. This corresponds to a dV /dt of --1013 Vs-1. Using drive voltages of the order of 50 -100kV with 5ns rise times, generated by a 3 stage Marx bank, voltage rise times in the region of 300ps have been generated using 95cm length of cable. This corresponds to a dV /dt of > 1014 Vs-1. Details of the pulser design are given and its suitability for use in excimer laser spiker circuitry is discussed.

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A high-voltage, short-risetime pulse generator based on a ferrite pulse sharpener

Abstract: A high-voltage, short-risetime pulse generator is described. The generator consists of a Marx bank, which produces an initial high-voltage pulse, and a ferrite pulse sharpener that reduces the risetime of the pulse. The generator delivers 70-kV, 350-ps risetime pulses into a 50-Ω load.

Cited by 37 publications

References 3 publications

Design and validation of an accelerator for an ultracold electron source

Design and validation of an accelerator for an ultracold electron source

A simple ultraviolet radiation-triggered switch with an electric field distortion gap for long-lifetime electrodes

High dV/dT Spiker Pulse Generation Using Magnetic Pulse Sharpening Techniques

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