Synchrotron radiation for long wavelength spectroscopy

A fundamental radiometric measurement has been carried out in the spectral region 1–140 cm^–1 which demonstrates the higher brightness of the synchrotron radiation source at Daresbury Laboratory over a high pressure mercury arc lamp source. Comparison of the output powers from the SRS and the mercury lamp revealed that the SRS has a particular advantage in the region where the wavelength of the emitted photon becomes very longer. The gain factor of the SRS at 10 cm^–1 was at least 10 times of the mercury lamp at a storage ring current of about 90 mA.A single period wiggler is considered to be a favorable device which will provide a higher level of photon fluxes from an electron storage ring in the long wavelength region.     

Synchrotron radiation in archaeometry

January 2008 was the time of the official opening of SOLEIL's beamlines and guest house. This transition from construction to operational phase was made possible after commissioning of the 17°C water circuits of the beamlines. Users have access to eleven beamlines, from infrared to hard X-ray (AILES, SMIS, DESIRS, CASSIOPEE, TEMPO, DIFFABS, ODE, CRISTAL, SAMBA, PROXIMA1 and SWING). The LUCIA beamline, which has been operational on SLS since June 2004, will be installed at SOLEIL from mid-2008, and the XPEEM station of the future “soft X-ray microscopy” beamline is already producing fascinating XMCD and XMLD results at ELETTRA. Five beamlines are under construction.     

Synchrotron radiation spectrum for galactic-sized plasma filaments

The radiation spectrum for synchrotron-emitting electrons in galactic-sized Birkeland current filaments is analyzed. It is shown that the number of filaments required to thermalize the emission spectrum to blackbody is not reduced when a non-Maxwellian electron distribution is assumed. If the cosmic background radiation (CBR) spectrum (T=2.76 K) is due to absorption and re-emission of radiation from galactic-sized current filaments, higher-order synchrotron modes are not as highly self absorbed as lower-order modes, resulting in a distortion of the blackbody curve at higher frequencies. This is especially true for a non-Maxwellian distribution of electrons for which the emission coefficient at high frequencies is shown to be significantly less than that for a Maxwellian distribution. The deviation of the CBR spectrum in the high-frequency regime may thus be derivable from actual astrophysical parameters, such as filamentary magnetic fields and electron energies in the model     

Synchrotron radiation of photino Pairs

The probability of photino-pair emission by an electron moving in an external electromagnetic field $(e \to e\tilde \gamma \tilde \gamma )$ is calculated within the minimal supersymmetric extension of the Standard Model. This process is analyzed in two different cases: the production of massless photinos is studied first, and the effect of a finite photino mass is taken into account after that. The results of the calculations are applied to the theory of stellar evolution. In particular, the photino emissivity of a neutron star due to the above reaction is calculated. A comparison of the rate of star cooling induced by photino emission with the rates associated with other competing mechanisms of energy losses makes it possible to set a new constraint on the selectron mass: $M_{\tilde e_R } = M_{\tilde eL} \geqslant 96.3$ GeV.     

Synchrotron radiation of crystallized beams

We study the modifications of synchrotron radiation of charges in a storage ring as they are cooled. The pair correlation lengths between the charges are manifest in the synchrotron radiation and coherence effects exist for wavelengths longer than the coherence lengths between the charges. Therefore, the synchrotron radiation can be used as a diagnostic tool to determine the state (gas, liquid, crystal) of the charged plasma in the storage ring. We show also that the total power of the synchrotron radiation is significantly reduced for crystallized beams, both coasting and bunched. This opens the possibility of accelerating particles to ultrarelativistic energies using small-sized cyclic accelerators.     

Synchrotron motion with radiation reaction

It is shown that the longitudinal velocity of a charged particle moving in a uniform magnetic field, and obeying Dirac-Lorentz relativistic equation of motion with radiation reaction is constant. Suitable approximate methods, which give fairly accurate results, are used to obtain the expression for velocity and displacement along the transverse section. They describe the motion completely up to a correcting factor $$1 + 0\left\{ {\left( {\frac{{e^3 B}}{{m^3 c^4 }}} \right)^2 } \right\}; \frac{{e^3 B}}{{m^3 c^4 }} \simeq 10^{ - 16} B$$ for electrons,B inG.     

Synchrotron radiation and its application

In this paper, the basic formulas are derived for the theory of synchrotron radiation and some important practical applications of synchrotron radiation are discussed, as well as the prospects for the further development of these investigations.Plenary Report, deliverd at the opening of the All-Union Conference on The Development and Practical Application of Electron Accelerators, September 3, 1975.Translated from Vysshikh Uchebnykh Zavedenii, Fizika, No. 4, pp. 7–16, April, 1976.     

“Synchrotron radiation research”

Edited by: H. Winick and S. Doniach. Plenum: New York and London, pp. 754 ($65).     

Synchrotron radiation of a relativistic magneton

The classical theory of synchrotron radiation of an electrically neutral relativistic particle with a large intrinsic magnetic moment is considered (g-factor much greater than unit). The spectral-angular composition and polarization of the radiation are studied. The magneton radiation self-polarization time is calculated. It is shown that identical results follow from the Ternov-Bagrov-Khapaev quantum theory constructed on the basis of the Dirac-Pauli equation for a neutron.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 38–41, May, 1986.The authors express their gratitude to V. G. Bagrov for his interest in the study and valuable remarks.     

同步辐射光源及其应用

介绍了同步辐射光源的产生、特点及其应用。     

Synchrotron Cerenkov radiation and electron self-polarization

Synchrotron Cerenkov radiation in a medium whose refractive index is given by a polynomial n(y) = 1+c₁+c₂y is examined. The self-polarization effect in this medium is investigated. The optimum values of and n for which the degree of electron self-polarization P may increase and the region of their values for which the degree of self-polarization decreases are found.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 1, pp. 42–47, January, 1990.     

Synchrotron radiation study of diffusion in FeAl

Nuclear resonance scattering of synchrotron radiation has been used to determine the elementary diffusion jump in the ordered stoichiometric alloy FeAl. To that aim the intensity decay in forward direction is measured as a function of crystal orientation. A decision between various jump models confirms earlier results from classical quasielastic Mössbauer spectroscopy, but with considerably better angular resolution.     

Synchrotron radiation of charges distributed in space

We investigate characteristics of spontaneous radiation of a uniformly charged rod orthogonal to a given plane and moving such that is projection on this plane moves uniformly on a circle. It is shown that the power of radiation of such charged structure is smaller than the power of radiation of point charge of the same value and moving on the same circle. With increasing energy, the power of radiation increases slower than the power of synchrotron radiation.Institute of High Current Electrotechniques, Siberian Branch, Russian Academy of Sciences. Tomsk State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 1, pp. 23–25, January, 1993.