The radiation environment encountered by astronauts during spaceflight is far more complex than any radiation field existed on Earth. Space crew living and working in the International Space Station (ISS) are exposed to a mixed radiation field comprises primary high-energy cosmic rays, including energetic protons and heavy ions, and to secondary radiations, including energetic neutrons, produce...

During the past three years the number of neutron therapy patients treated at the Gershenson Radiation Oncology Center has remained approximately constant. The facility is operating at maximum load, approximately 9500 fields per year. In the present paper, data for the clinical load and usage of the cyclotron, since it entered routine clinical operation March 1992 are presented, together with d...

A 12.5 MeV, 25 μA, proton compact superconducting cyclotron for medical isotope production has been produced. The machine is initially aimed at producing 13N ammonia for Positron Emission Tomography (PET) cardiology applications. With an ultra-compact size and costeffective price point, this system offers clinicians unprecedented access to the preferred radiopharmaceutical isotope for cardiac P...

The TE72 mode in cylindrical waveguide has its group velocity nearly equal to that of the TE11 mode when the operating frequency of the former is seven times of that of the latter. Thus the two modes have almost the same resonant magnetic field, and coherent radiation can be generated at the 7th harmonic when the fundamental energizes a gyrating electron beam by the cyclotron autoresonance inte...

The electron cyclotron maser (ECM) is based on a stimulated cyclotron emission process involving energetic electrons in gyrational motion. It constitutes a cornerstone of relativistic electronics, a discipline that has emerged from our understanding and utilization of relativistic effects for the generation of coherent radiation from free electrons. Over a span of four decades, the ECM has unde...

We consider the effects of vacuum polarization and proton cyclotron resonances on the propagation of radiation through a strongly magnetized plasma. We analyze the conditions under which the photons evolve adiabatically through the resonant density and find that the adibaticity condition is satisfied for most photon energies of interest, allowing for a normal-mode treatment of the photon propag...

An intense beam of 122 MeV/u (9.3 GeV) Ge ions was stopped in aluminum samples at the Coupled Cyclotron Facility at NSCL, MSU. Attempts were made at ORNL to measure changes in material properties by measuring changes in electrical resistivity and microhardness, and by transmission electron microscopy characterization, for defect density caused by radiation damage, as a function of depth and int...

It is found that 1E 1207.4-5209 could be a low-mass bare strange star if its smaller radius or low altitude cyclotron formation can be identified. The age problems of five sources could be solved by a fossil-disk-assisted torque. The magnetic dipole radiation dominates the evolution of PSR B1757-24 at present, and the others are in propeller (or tracking) phases. Subject headings: pulsars: gene...

Homogeneous laser radiation in the visible or infrared range can excite high-order subharmonics at the cyclotron frequency of free electrons in the millimeter or microwave range. This may provide coherent links between lasers and rf or microwave frequency standards. In order to divide the frequency of a CO(2) laser (lambda approximately 10 microm) by a factor of 100 down to lambda approximately...

Chapter 4 Computational aspects of high-throughput crystallographic macromolecular structure determination Paul D. Adams, Ralf W. Grosse-Kunstleve and Axel T. Brunger Lawrence Berkeley Laboratory, 1 Cyclotron Road, BLDG 64R0121, Berkeley CA 94720, USA. The Howard Hughes Medical Institute and Departments of Molecular and Cellular Physiology, Neurology and Neurological Sciences, Structural Biolog...