Application of Accelerators and Storage Rings

AbstractIt is well known from Maxwell theory that electromagnetic radiation is emitted whenever electric charges are accelerated in free space. This radiation assumes quite extraordinary properties whenever the charged particles move at ultrarelativistic speed: The radiation becomes very powerful and tightly collimated in space, and it may easily cover a rather wide spectrum ranging from the THz into the hard X-ray regime. When generation of such radiation is intended rather than being a side effect, the charged particles are normally electrons, thus kinetic energies are then typically in the multi-MeV range.

Download Full-text

Transport of radiation & energetic particles in accretion flows

Symposium - International Astronomical Union ◽

10.1017/s0074180900153082 ◽

1986 ◽

Vol 119 ◽

pp. 407-408

Author(s):

R. Cowsik ◽

M.A. Lee

Keyword(s):

Electromagnetic Radiation ◽

Charged Particles ◽

Energetic Particles ◽

Compact Objects ◽

X Ray ◽

Accretion Flows

The equations describing the transport of suprathermal charged particles and electromagnetic radiation across accretion flows onto compact objects are solved analytically, including the effect of shocks in the flows. These solutions indicate (a) accretion flows with shocks accelerate particles very efficiently upto ultra-relativistic energies. (b) the emergent spectra of electromagnetic radiation from such flows reproduce the observed spectra of quasars from the infrared to the hard X-ray region.

Download Full-text

Transport of neutrinos, radiation and energetic particles in accretion flows

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1982.0138 ◽

1982 ◽

Vol 383 (1785) ◽

pp. 409-437 ◽

Cited By ~ 9

Keyword(s):

Cosmic Rays ◽

Electromagnetic Radiation ◽

Gravitational Collapse ◽

Charged Particles ◽

Energetic Particles ◽

Compact Objects ◽

Red Giants ◽

X Ray ◽

Accretion Flows

The equations describing the transport of suprathermal charged particles, electromagnetic radiation and neutrinos across accretion flows onto compact objects are solved analytically, the effects of shocks in the flow being included. These solutions are used in discussing three illustrative astrophysical examples: acceleration of cosmic rays, generation of spectral continua in quasars and the effect of neutrinos during the collapse of supernova precursors. The main results are: ( а ) Accretion flows with shocks accelerate cosmic rays very efficiently up to the highest energies. ( b ) The emergent spectra of electromagnetic radiation from such flows reproduce the observed spectra of quasars from infrared to the hard X-ray region. ( c ) The neutrinos in the collapsing cores of red giants develop a very hard non-thermal tail in their distribution facilitating the rebound of the gravitational collapse leading to the supernovae.

Download Full-text

X-ray lithography and storage rings

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment ◽

10.1016/0168-9002(86)90174-9 ◽

1986 ◽

Vol 246 (1-3) ◽

pp. 687-694 ◽

Cited By ~ 2

Author(s):

John Warlaumont

Keyword(s):

Storage Rings ◽

X Ray ◽

And Storage

Download Full-text

Production, transfer and injection of charged particles in traps and storage rings

Physica Scripta ◽

10.1088/0031-8949/1995/t59/012 ◽

1995 ◽

Vol T59 ◽

pp. 93-105 ◽

Cited By ~ 11

Author(s):

R B Moore ◽

A M Ghalambor Dezfuli ◽

P Varfalvy ◽

H Zhao ◽

The ISOLDE Collaboration

Keyword(s):

Charged Particles ◽

Storage Rings ◽

And Storage

Download Full-text

Relativistic Thomson scattering in compact linacs and storage rings: a route to quasi-monochromatic tunable laboratory-scale x-ray sources

10.1117/12.732010 ◽

2007 ◽

Cited By ~ 4

Author(s):

E. G. Bessonov ◽

M. V. Gorbunkov ◽

Yu. Y. Maslova ◽

P. V. Kostryukov ◽

V. G. Tunkin ◽

...

Keyword(s):

Thomson Scattering ◽

Storage Rings ◽

Laboratory Scale ◽

X Ray ◽

And Storage

Download Full-text

Quantitative Analysis Of X-Ray Images From Geological Materials

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010013482x ◽

1990 ◽

Vol 48 (2) ◽

pp. 244-245

Author(s):

J. M. Paque ◽

R. Browning ◽

P. L. King ◽

P. Pianetta

Keyword(s):

Quantitative Analysis ◽

Bulk Composition ◽

Principal Component ◽

Analytical Description ◽

Bulk Sample ◽

Geological Samples ◽

X Ray ◽

Software And Hardware ◽

And Storage ◽

Insight Into

Geological samples typically contain many minerals (phases) with multiple element compositions. A complete analytical description should give the number of phases present, the volume occupied by each phase in the bulk sample, the average and range of composition of each phase, and the bulk composition of the sample. A practical approach to providing such a complete description is from quantitative analysis of multi-elemental x-ray images.With the advances in recent years in the speed and storage capabilities of laboratory computers, large quantities of data can be efficiently manipulated. Commercial software and hardware presently available allow simultaneous collection of multiple x-ray images from a sample (up to 16 for the Kevex Delta system). Thus, high resolution x-ray images of the majority of the detectable elements in a sample can be collected. The use of statistical techniques, including principal component analysis (PCA), can provide insight into mineral phase composition and the distribution of minerals within a sample.

Download Full-text