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Category Archives: Marx Generators

In Memoriam: Robert (Bob) Iannini (1938-2023)

Posted on September 26, 2023 by David Prutchi Posted in Administrative, High-Voltage Power Supply, Instrumentation, Lasers, Marx Generators
Robert (Bob) Iannini, inventor, author, and founder of Information Unlimited

Image Credit: Information Unlimited

I recently learned the saddening news of the passing of Robert (Bob) Iannini on April 3, 2023, just shy of his 85th birthday. Bob, an extraordinary inventor, celebrated book author, and the mastermind behind “Information Unlimited,” succumbed to pneumonia, leaving a void in the world of amateur science and electronics.

From my high school days, Bob’s innovative paper plans and kits were my constant companions. They were more than just gadgets and devices; they were a gateway into the magical world of out-of-the-ordinary electronics, a world where possibilities seemed endless. Those kits, along with his captivating books, were my stepping stones into understanding the nuances of the ever-fascinating realm of high voltage, ultrasonics, and lasers. They nurtured my curiosity and fueled my passion.

Bob’s genius was evident in every project he conceived and every kit he designed. But beyond his brilliance, he had an innate ability to inspire young minds like mine. He made these very complex topics approachable, fun, and endlessly intriguing. With each of his creations, he imparted a sense of wonder that drove many of us to push boundaries and think beyond the conventional.

“Information Unlimited” was more than just a business; it was Bob’s legacy. It was a beacon for those with an insatiable thirst for knowledge, serving as a treasure trove of information, ideas, and inspiration for enthusiasts of all ages. In light of Bob’s passing, his wife Ann informed me that “Information Unlimited” had to be temporarily closed. However, with resilience and hope, Ann aspires to reopen its doors in just a few months, ensuring that Bob’s legacy continues to shine brightly and inspire many more.

As I reflect upon his remarkable journey, I can’t help but feel an overwhelming sense of gratitude. Bob Iannini’s indelible impact on amateur scientists, hobbyists, and curious minds across the world will forever resonate.

To Bob, thank you for igniting the flames of curiosity in countless souls. You may have departed from this world, but your legacy will continue to inspire generations to come.

Febetron/Fexitron Marx Bank Module

Posted on March 9, 2021 by David Prutchi Posted in High-Voltage Power Supply, Marx Generators

I have kept on making space in my lab for new projects, and came across 3 new-old-stock Marx generator modules that were made for the Fexitron and Febetron flash X-ray sources and electron accelerators. The Fexitron and Febetron devices were made in the 1970s by the Field Emission Corporation, a division of HP, which is now L-3 Pulse Sciences.

Each module contains two complete 30 kV Marx stages. In the Febetron/Fexitron pulsers, modules were stacked to form Marx generators of up to 2.3MV output. The spark gap distance is adjustable. These modules are designed for use under 20-70 psi air or nitrogen.

My intention was to build a 180 kV fast Marx with these, so I had reverse-engineered the schematic for these modules. I’m putting it here in case that someone is interested.

The following are interesting links related to Fexitron/Febetron units:

  • The Hofstra Group used to carry them. They probably can still repair them.
  • Picture of a 1200 MW flash x-ray tube made for the Fexitron. Beam volume was 3.5 cc (600 kV, 2000 amps, 0.2 µs).
  • Febetron information from RPI.
  • Field Emission Corp patent: Fexitron Febetron Marx Generator Patent US3783289

 

Teaser on upcoming writeup on DIY Pressurized-Vessel MegaVolt-Class Marx Generator

Posted on April 23, 2018 by David Prutchi Posted in High-Voltage Power Supply, Marx Generators
DIY pressurized-vessel coaxial Marx generators by David Prutchi PhD

DIY pressurized-vessel coaxial Marx generators

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