Release mechanisms from shallow engineered trenches used as repositories for radioactive wastes

SIGLEAvailable from British Library Document Supply Centre- DSC:3614.604(DOE/RW--87.108) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Physics of free electron lasers An introduction

The present paper contains a systematic exposure of basic principles of free electron laser physics. FEL models are discussed wherein space charge fields, energy spread of the electrons in the beam and diffraction effects are taken into account. We present detailed study of one-dimensional theory of an FEL amplifier, FEL oscillator and FEL oscillator with multicomponent undulator. We present also an introduction to the analysis of the diffraction effects using the FEL amplifier model. When exposing linear theory we use analytical techniques and investigation of nonlinear mode of the FEL devices operation is performed using the results of numerical simulations. The results of the linear theory serve as a primary standard to check an accuracy of numerical simulations. We perform thorough analysis of the saturation effects in the FEL devices and of the methods to increase the FEL efficiency. Theoretical study is preformed with a wide use of similarity techniques, so the obtained results are simultaneously of the high degree of generality and completely specified. Numerous universal graphs illustrating various models of the FEL operation together with the reduced design formulae can help the reader to find FEL characteristics using the simple dimensional analysis only. It may be useful also for FEL designers, especially at the design stage of an experiment. (orig.)Available from TIB Hannover: RA 2999(94-219) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Direct disposal of spent nuclear fuel The current status of technology, January 1987

Contractor's reference C6965/ENP/001Available from British Library Document Supply Centre- DSC:3614.604(DOE/RW--87.021) / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo

On a possibility to construct gamma-gamma collider at TESLA

This paper presents the conceptual project of a 2 x 250 GeV photon collider at TESLA. The main idea of the proposal is to use the beam of the linear collider to generate FEL radiation. At an intermediate phase of acceleration (#epsilon# = 10 GeV) the electron beam passes the undulator of the FEL amplifier and amplifies the optical radiation of the master oscillator (#lambda# = 1.053 #mu#m, peak power 100 MW). An output radiation of 350 GW peak power is produced at the amplifier exit. After that the electron and optical bunches are separated. The electron bunch is accelerated up to the final energy of 250 GeV and the optical bunch is transported to the conversion point via an open optical waveguide which has the form of a diaphragm focusing line and is placed in parallel with the main accelerator. At the conversion point the optical beam is focused on the electron beam and after the conversion point the gamma quanta follow the initial electron trajectory and meet at the interaction point with the other gamma-beam produced by another part of the collider. The integral luminosity of the colliding #gamma#-beams is L_#gamma#_#gamma# #approx =# 1.5 x 10"3"3 cm"-"2s"-"1. The feasibility of the proposal is confirmed by the results of numerical simulations. (orig.)SIGLEAvailable from TIB Hannover: RA 2999(94-243) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman