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Tihiro Ohkawa
was a Japanese physicist whose field of work was in plasma physics and fusion power. He was a pioneer in developing ways to generate electricity by nuclear fusion when he worked at General Atomics. Ohkawa died September 27, 2014, in La Jolla, California, at the age of 86. Early life and career Ohkawa was born in Kanazawa on January 3, 1928. He studied physics at the University of Tokyo in 1950, and was a member of the Yoshio Nishina group for researching cosmic altitude radiation for 16 years even during the World War II. He was a researcher at CERN and at Midwestern State University before becoming a professor at the University of Tokyo. In 1960, he went to General Atomics, where he led a fusion research project and later became vice president and deputy chairman of the board. In 1994, Ohkawa left General Atomics to found TOYO Technologies. In 2004, he was co-founder of Nano Fusion Technologies with Masano Nishikawa for the development of microfluidics. He was also a physics p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kanazawa
is the capital of Ishikawa Prefecture in central Japan. , the city had an estimated population of 466,029 in 203,271 households, and a population density of 990 persons per km2. The total area of the city was . Etymology The name "Kanazawa" (, ), which literally means "marsh of gold", is said to derive from the legend of the peasant Imohori Togoro (literally "Togoro Potato-digger"), who was digging for potatoes when flakes of gold washed up. The well in the grounds of Kenroku-en is known as to acknowledge these roots. The area where Kanazawa is was originally known as Ishiura, whose name is preserved at the Ishiura Shrine near Kenrokuen. The area around Kanazawa was part of ancient Kaga Province. History Muromachi period During the Muromachi period (1336 to 1573), as the power of the central shōguns in Kyoto was waning, Kaga Province came under the control of the Ikkō-ikki, followers of the teachings of priest Rennyo, of the sect, who displaced the official ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CERN
The European Organization for Nuclear Research, known as CERN (; ; ), is an intergovernmental organization that operates the largest particle physics laboratory in the world. Established in 1954, it is based in Meyrin, western suburb of Geneva, on the France–Switzerland border. It comprises #Member states and budget, 24 member states. Israel, admitted in 2013, is the only full member geographically out of Europe. CERN is an official United Nations General Assembly observers#Intergovernmental organizations, United Nations General Assembly observer. The acronym CERN is also used to refer to the laboratory; in 2023, it had 2,666 scientific, technical, and administrative staff members, and hosted about 12,370 users from institutions in more than 80 countries. In 2016, CERN generated 49 Byte#Multiple-byte units, petabytes of data. CERN's main function is to provide the particle accelerators and other infrastructure needed for high-energy physics research – consequently, numer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radioactive Isotopes
A radionuclide (radioactive nuclide, radioisotope or radioactive isotope) is a nuclide that has excess numbers of either neutrons or protons, giving it excess nuclear energy, and making it unstable. This excess energy can be used in one of three ways: emitted from the nucleus as gamma radiation; transferred to one of its electrons to release it as a conversion electron; or used to create and emit a new particle (alpha particle or beta particle) from the nucleus. During those processes, the radionuclide is said to undergo radioactive decay. These emissions are considered ionizing radiation because they are energetic enough to liberate an electron from another atom. The radioactive decay can produce a stable nuclide or will sometimes produce a new unstable radionuclide which may undergo further decay. Radioactive decay is a random process at the level of single atoms: it is impossible to predict when one particular atom will decay. However, for a collection of atoms of a single nucl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ITER
ITER (initially the International Thermonuclear Experimental Reactor, ''iter'' meaning "the way" or "the path" in Latin) is an international nuclear fusion research and engineering megaproject aimed at creating energy through a fusion process similar to that of the Sun. It is being built next to the Cadarache facility in southern France. Upon completion of the main reactor and first plasma, planned for 2033–2034, ITER will be the largest of more than 100 fusion reactors built since the 1950s, with six times the plasma volume of JT-60SA in Japan, the largest tokamak operating today. The long-term goal of fusion research is to generate electricity; ITER's stated purpose is scientific research, and technological demonstration of a large fusion reactor, without electricity generation. ITER's goals are to achieve enough fusion to produce 10 times as much thermal output power as thermal power absorbed by the plasma for short time periods; to demonstrate and test technologies that wo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DIII-D (tokamak)
DIII-D is a tokamak that has been operated since the late 1980s by General Atomics (GA) in San Diego, California, for the United States Department of Energy. The DIII-D National Fusion Facility is part of the ongoing effort to achieve magnetically confined fusion. The mission of the DIII-D Research Program is to establish the scientific basis for the optimization of the tokamak approach to fusion energy production. DIII-D was built on the basis of the earlier Doublet III, the third in a series of machines built at GA to experiment with tokamaks having non-circular plasma cross sections. This work demonstrated that certain shapes strongly suppressed a variety of instabilities in the plasma, which led to much higher plasma pressure and performance. DIII-D is so-named because the plasma is shaped like the letter D, a shaping that is now widely used on modern designs, and has led to the class of machines known as "advanced tokamaks." Advanced tokamaks are characterized by operation a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Donald William Kerst
Donald William Kerst (November 1, 1911 – August 19, 1993) was an American physicist who worked on advanced particle accelerator concepts (accelerator physics) and plasma physics. He is most notable for his development of the betatron, a novel type of particle accelerator used to accelerate electrons. A graduate of the University of Wisconsin–Madison, Kerst developed the first betatron at the University of Illinois at Urbana Champaign, where it became operational on July 15, 1940. During World War II, Kerst took a leave of absence in 1940 and 1941 to work on it with the engineering staff at General Electric, and he designed a portable betatron for inspecting dud bombs. In 1943 he joined the Manhattan Project's Los Alamos Laboratory, where he was responsible for designing and building the Water Boiler, a nuclear reactor intended to serve as a laboratory instrument. From 1953 to 1957 Kerst was technical director of the Midwestern Universities Research Association, where ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Multipole Magnet
Multipole magnets are magnets built from multiple individual magnets, typically used to control Charged particle beam, beams of charged particles. Each type of magnet serves a particular purpose. * Dipole magnets are used to bend the trajectory of particles * Quadrupole magnets are used to focus particle beams * Sextupole magnets are used to correct for chromaticity (accelerator), chromaticity introduced by quadrupole magnets Magnetic field equations The magnetic field of an ideal multipole magnet in an accelerator is typically modeled as having no (or a constant) component parallel to the nominal beam direction (z direction) and the transverse components can be written as complex numbers: B_x + i B_y = C_n \cdot ( x - iy )^ where x and y are the coordinates in the plane transverse to the nominal beam direction. C_n is a complex number specifying the orientation and strength of the magnetic field. B_x and B_y are the components of the magnetic field in the corresponding dire ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tokamak
A tokamak (; ) is a device which uses a powerful magnetic field generated by external magnets to confine plasma (physics), plasma in the shape of an axially symmetrical torus. The tokamak is one of several types of magnetic confinement fusion, magnetic confinement devices being developed to produce controlled thermonuclear fusion power. The tokamak concept is currently one of the leading candidates for a practical fusion reactor for providing minimally polluting electrical power. The proposal to use controlled thermonuclear fusion for industrial purposes and a specific scheme using thermal insulation of high-temperature plasma by an electric field was first formulated by the Soviet physicist Oleg Lavrentiev in a mid-1950 paper. In 1951, Andrei Sakharov and Igor Tamm modified the scheme by proposing a theoretical basis for a thermonuclear reactor, where the plasma would have the shape of a torus and be held by a magnetic field. The first tokamak was built in the Soviet Union ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Midwestern Universities Research Association
The Midwestern Universities Research Association (MURA) was a collaboration between 15 universities with the goal of designing and building a particle accelerator for the Midwestern United States. It existed between 1953–1967, but could not achieve its goal in this time and lost funding. It was thought that President John F. Kennedy would have supported the MURA machine, while one of President Lyndon B. Johnson's first actions was the shutdown of the MURA machine and laboratory. In its formative years, Donald Kerst was the director of MURA. At this institution, Keith Symon invented the FFAG accelerator, independently to Tihiro Ohkawa, which combines several concepts of cyclotrons and synchrotron A synchrotron is a particular type of cyclic particle accelerator, descended from the cyclotron, in which the accelerating particle beam travels around a fixed closed-loop path. The strength of the magnetic field which bends the particle beam i ...s. FFAG concepts were extensively d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andrei Kolomensky
Andrei, Andrey or Andrej (in Cyrillic script: Андрэй, Андрей or Андреј) is a form of Andreas/Ἀνδρέας in Slavic languages and Romanian. People with the name include: *Andrei of Polotsk (–1399), Lithuanian nobleman *Andrej Babiš (born 1954), Czech prime minister *Andrey Belousov (born 1959), Russian politician *Andrey Bolotov (1738–1833), Russian agriculturalist and memoirist *Andrey Borodin (born 1967), Russian financial expert and businessman *Andrei Broder (born 1953), Romanian-Israeli American computer scientist and engineer *Andrei Chikatilo (1936–1994), prolific and cannibalistic Russian serial killer and rapist *Andrei Denisov (weightlifter) (born 1963), Israeli Olympic weightlifter *Andrey Ershov (1931–1988), Russian computer scientist *Andrey Esionov, Russian painter *Andrei Glavina (1881–1925), Istro-Romanian writer and politician *Andrei Gromyko (1909–1989), Belarusian Soviet politician and diplomat *Andrei Iosivas (born 1999), Ameri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Keith Symon
Keith Randolph Symon (March 25, 1920 – December 16, 2013) was an American physicist working in the fields of accelerator physics and plasma physics. Symon graduated summa cum laude, Phi Beta Kappa, from Harvard in 1942 with a BA in Philosophy and Mathematics. In 1948 he was awarded a PhD in Physics. He taught physics at Wayne State University in Detroit until 1955. Symon was professor of physics at the University of Wisconsin until his retirement in 1992 when he became emeritus professor. From 1956 to 1967 he was on the staff of the Midwestern Universities Research Association (MURA), a collaboration of Big Ten universities, the University of Chicago and Notre Dame. In 1982 and 1983 he was acting director of the Madison Academic Computing Center and from 1983 to 1985, acting director of the UW-Madison Synchrotron Radiation Center. His textbook, "Mechanics", has been a staple in physics classes since publication of the first edition in 1953. It has been published in multiple langu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
