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Karl L. Brown (1925-2002) was a particle physicist and professor at the Stanford Linear Accelerator Center (SLAC) at Stanford University in the United States. He earned an international reputation as an expert in magnetic transport systems or beam optics for particle accelerators, for developing formalisms and computational methods for designing beam transport that were adopted worldwide, and as a leader in the introduction of the first commercially successful line of medical accelerators for External Beam Radiotherapy.

Education

Largely inspired by his high school physics teacher (and eventually superintendent) Bry Copley, Brown enrolled at the nearby University_of_Utah where he studied electrical engineering. Park City silver scholarship to attend

His senior year, he transferred to Stanford_University in order to pursue accelerator physics, completing his Physics B.S. in 1947, his M.S. in 1949, and his PhD in 1953, all at Stanford. His masters thesis addressed the beam dynamics of the first high-powered klystron under his advisor and Klystron pioneer Marvin Chodorow. Then in 1953, under his advisor, Wolfgang_K._H._Panofsky, the future director of SLAC_National_Accelerator_Laboratory, he completed his Physics Ph.D. thesis which dealt with electron scattering and the commissioning of the Mark II accelerator.

Projects

In April of 1956, the first meeting was organized to explore the possibilities for building a Multi- GeV electron linear accelerator at Stanford. The machine envisioned, initially called Project-M, became the Stanford Linear Accelerator. Karl Brown participated beginning at this first meeting.

At the isochronous cyclotron at Forschungszentrum_Jülich, the magnet spectrometer in operation since 1979 was named "Big Karl" in honor of Karl Brown. The name has a double meaning in that "Big Karl" translates to German as "Karl der Große" the German equivalent of Charlemagne the GreatCharlemagne_the_great who ruled the area in the 8th and 9th centuries.

Medical Accelerators

In the early 1950's, Brown joined a team led by physicist Edward_Ginzton and Dr Henry Kaplan of Stanford_Medical_School to build what became the first linear accelerator in the Western hemisphere to be used in the treatment of cancer.

In 1958, Brown became president and chief scientist of Spectromagnetics, a small-accelerator design and manufacturing firm which was sold in 1966 to Varian_Associates. This led to Brown's employ as Senior Scientist and Director of Research at Varian’s Radiation Division until 1968. While in this role, Brown led the development of the first commercially successful medical accelerator known as the Clinac I. This marked the beginning on an industry and a business for Varian making machines that now treat over 100,000 patients a day. His inventions were foundational for the development of the first commercial line of Clinac series accelerators for radiotherapy. Karl was also instrumental in designing the C-Series and TrueBeam bend magnets which expertly guide radiation beams, ensuring precise targeting of tumors while protecting healthy tissues. This was achieved through his design of a bending electromagnet that dispersed the energy spectrum and passed only a narrow range of wavelengths. A focusing magnet bends different wavelengths in commensurate proportion. The narrower the band of wavelengths being bent, the more condensed the focus can be.

The C-Series machines remained in production through 2024 after passing a milestone of 10,000 installations. (reference Varian internal newsletter.)

Other locations

• Between 1992 and 1994, Waxahatchie, TX he contributed on the layout and design of the beam-transfer lines and injection systems for the various booster accelerators at the Superconducting Super Collider (SSC) where his wife, particle physicist Vera Lüth, was concurrently the deputy associate director of research.
• CERN, Geneva, Switzerland. 1984-85, Brown’s second-order achromat methods were applied to the chromaticity-correction lattice of CERN’s Large_Electron–Positron_Collider.
• CERN, Geneva, Switzerland. 1972-73, where his methods were used for designing the secondary beam lines for the large super proton synchrotron (SPS), and the design of secondary muon beams.
• 1958-1959, Visiting Scientist and Consultant at LAL Orsay, France

Personal Life

Born in Coalville, UT. Attended North Summit High School. Attributed his inspiration to the excellence of his science teacher, C.B. Copley.
Father of five children from his first marriage.
His first marriage ended in the early 1970's. In 1977 he married Vera G. Lüth, also a particle physicist at SLAC, in Santa Clara County, California. They remained together for the remainder of his life.
His gravestone includes a copper ring from an accelerator.

Publications

• A First and Second Order Matrix Theory for the Design of Beam Transport Systems and Charged Particle Spectrometers, 1968
• TRANSPORT/360: A Computer Program for Designing Charged Particle Beam Transport Systems, 1970

Patents

• Stepped gap achromatic bending magnet
• Magnetic beam deflection system free of chromatic and geometric aberrations
• Achromatic magnetic beam deflection system related cases
• Method of and apparatus for deflecting beams of charged particles
• Method of focusing charged particles to provide zero momentum dispersion

Recognitions

• Fellow of the American Physical Society
• 1989 Prize for achievement in accelerator science and technology by the US Particle Accelerator School, "For Insights Into Particle Beam Transport and For Introducing Formalisms in Use Throughout the World".

External links

• Karl L. Brown Stanford Memorial Resolution by Wolfgang_K._H._Panofsky
• Obituary: New York Times
• SLAC Archives
• Obituary: LA Times
• Physics Today
• List_of_accelerators_in_particle_physics