What was the contribution made by de Graaff to the technology John Trump and Robert Van de Graaff developed together?
John G. Trump John George Trump (August 21, 1907 – February 21, 1985) was an American electrical engineer, inventor, and physicist. He was a recipient of U.S. President Ronald Reagan's National Medal of Science, and a member of the National Academy of Engineering. John Trump was noted for developing rotational radiation therapy. Together with Robert J. Van de Graaff, he developed one of the first million-volt X-ray generators. He was the paternal uncle of U.S. President Donald Trump.
Joanna Maria Vandenberg Joanna (Joka) Maria Vandenberg (born 1938) is a Dutch solid state chemist and crystallographer who immigrated to the Unites States in 1968. At Bell Telephone Laboratories, she made a major contribution to the success of the Internet. She invented, developed, and applied the X-ray scanning tool for quality control essential to manufacturing indium gallium arsenide phosphide-based multi-quantum well lasers. These are the lasers that amplify and modulate light that travels through optical fibers that are at the heart of today's Internet.