نتایج جستجو برای: synchrotron

تعداد نتایج: 17232  

2010
Reuven Ramaty

The intensity, spectrum and polarization of gyro-synchrotron radiation from an arbitrary distribution of electrons in a magnetoactive plasma are calculated. These calculations are based on detailed theories of gyro-synchrotron emission and absorption as well as on the equations of radiation transfer in the limit of large Faraday rotation. By performing extensive numerical calculations, for both...

Journal: :Journal of synchrotron radiation 2000
T Sekka S A Volchikhina A Tanaka M Hasegawa Y Tanaka Y Ohtani T Tajima H Makuuchi E Tanaka Y Iwata S Sato K Hyodo M Ando K Umetani M Kubota K Tanioka H Mori

The usefulness of a synchrotron microangiography system for depicting, quantitating and therapeutically evaluating angiogenic vessels in cancer is illustrated. In 20 mice transplanted with murine colon cancer, sequential changes in the angiogenic vessels were determined by using synchrotron microangiography, using changes in tumor volume for reference. This system allowed the depiction and quan...

2000
A. Wolter

We report on the BeppoSAX observations of four “extreme” BL Lacs, selected to have high synchrotron peak frequencies. All have been detected also in the PDS band. For 1ES 0120+340, PKS 0548–322 and H 2356–309 the spectrum is well fitted by a convex broken powerlaw, thus locating the synchrotron peak around 1–4 keV. 1ES 1426+428 presents a flat energy spectral index (αx = 0.92) up to ∼100 keV, t...

2000
L. COSTAMANTE G. GHISELLINI A. CELOTTI P. GIOMMI P. PADOVANI G. TAGLIAFERRI A. WOLTER M. CHIABERGE G. FOSSATI E. PIAN L. MARASCHI F. TAVECCHIO A. TREVES

Blazars can be classified on the basis of their overall Spectral Energy Distribution (SED). BL Lac objects are usually divided in LBL or HBL (Low or High energy peaked BL Lacs), according to the peak frequency of the synchrotron emission, if in the optical or UV–soft-X band respectively. FSRQs instead are characterized by synchrotron peaks mainly at IR–optical frequencies, similarly to LBLs. He...

2000
G. TAGLIAFERRI G. GHISELLINI M. RAVASIO A. CELOTTI M. CHIABERGE L. CHIAPPETTI L. COSTAMANTE P. GIOMMI L. MARASCHI E. MASSARO R. NESCI C. M. RAITERI F. TAVECCHIO G. TOSTI A. TREVES M. VILLATA A. WOLTER

We present the results of two ToO BeppoSAX observations of BLLac. During the first observation we detected both the synchrotron and the Compton components. Fast time variability was present, but only for the synchrotron component. During the second observation the spectrum was flatter and only the Compton component was present. Four different SED are presented and can be described by a blob mov...

2002
J. M. Byrd

Bursts of coherent synchrotron radiation at far-infrared and millimeter wavelengths have been observed at several storage rings. A microbunching instability has been proposed as the source for the bursts but the mechanism has yet to be elucidated. We provide the first evidence that the bursts are due to a microbunching instability driven by the emission of synchrotron radiation in the bunch. Ob...

2001
K. Baur S. Brennan

Total reflection x-ray fluorescence (TXRF) using Synchrotron Radiation is likely to be the most powerful non-destructive technique for the analysis of trace metal impurities on silicon wafer surfaces. Of fundamental importance in TXRF is the achievable sensitivity as characterized by the minimum detection limit. This work describes the progress we achieved recently at the Stanford Synchrotron R...

2000
Katherine M. Blundell D. E. Harris

A list is presented of known extragalactic radio jets which also have associated X-ray emission. The canonical emission processes for the production of X-rays are reviewed and the sources are categorized on the basis of our current understanding. Although it seems clear that the X-ray emission is non-thermal, the two competing processes, synchrotron and inverse Compton emissions, arise from ext...

2001
K. Matsuda K. Saito H. Nishiuchi M. Umezawa K. Hiramoto R. Shinagawa T. Tonooka

W-MAST (Wakasa-wan Energy Research Center Multipurpose Accelerator with Synchrotron and Tandem) consists of a tandem accelerator with 5MV terminal voltage and a compact ion synchrotron. The beam commissioning was started at the beginning of 1999 and was successfully accomplished in March 2000. A proton beam of 10MeV was injected from the tandem accelerator and accelerated by the ion synchrotron...

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