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Varian Associates was one of the first high-tech companies in Silicon Valley.It was founded in 1948 by Russell H. and Sigurd F. Varian, William Webster Hansen, and Edward Ginzton to sell the klystron, the first vacuum tube which could amplify electromagnetic waves at microwave frequencies, and other electromagnetic equipment.
On April 2, 1999, these divisions split to become Varian Semiconductor, Varian, Inc., and Varian Medical Systems. [12] [13] In August 2020, Siemens Healthineers announced plans to acquire Varian Medical Systems in an all-stock deal valued at $16.4 billion. [14] [15] The deal was approved and completed on 15 April 2021. [16]
Upon publication in 1939, [3] news of the klystron immediately influenced the work of US and UK researchers working on radar equipment. The Varians went on to found Varian Associates to commercialize the technology (for example, to make small linear accelerators to generate photons for external beam radiation therapy ).
Varian was spun off from Varian Associates in 1999 and was purchased by Agilent Technologies in May 2010 for $1.5 billion, or $52 per share. [ 2 ] Varian Inc. had its corporate headquarters in Palo Alto , California , and offices in Australia, the Benelux countries, Brazil, Canada, China, Germany, France, Italy, Japan, Korea, Russia, Sweden ...
Fermitron was an accelerator sketched by Enrico Fermi on a notepad in the 1940s proposing an accelerator in stable orbit around the Earth. The undulator radiation collider [7] is a design for an accelerator with a center-of-mass energy around the GUT scale. It would be light-weeks across and require the construction of a Dyson swarm around the Sun.
A linear particle accelerator (often shortened to linac) is a type of particle accelerator that accelerates charged subatomic particles or ions to a high speed by subjecting them to a series of oscillating electric potentials along a linear beamline.
Versa HD linear accelerator (linac), launched in 2013. [12] Elekta Unity MR-Linac, the first high field (1.5 Tesla) MR-Linac combines magnetic resonance imaging with a radiation therapy (MR/RT) system (linear accelerator). It was developed together with UMC Utrecht and Philips [13] and launched in 2018. [14] Harmony linear accelerator, launched ...
The longest linac in the world is the Stanford Linear Accelerator, SLAC, which is 3 km (1.9 mi) long. SLAC was originally an electron–positron collider but is now a X-ray Free-electron laser. Linear high-energy accelerators use a linear array of plates (or drift tubes) to which an alternating high-energy field is applied.