[en] The vacuum system of ESRP is studied by means of a static and dynamic finite element calculation method. The remarkable result appeared to be the possibility of pumping this system only by lumped pumps, by localizing most of the radiation induced gas load at a number of special absorbers ('crotches'). (orig.)

[en] A survey is given on the different coupling methods which have been developed and used for the vacuum components in the MEA-accelerator and experimental regions. The experience with these sealing mechanisms is described. Special attention is given to reliability and simplicity. (author)

[en] The low-mass exit-foil system for the spectrometers in the electron-scattering facility at NIKHEF-K is described. It facilitates the achievement of high momentum resolution as well as the possibility to use the spectrometers for detection of not only protons but also deuterons, tritons, ³He and ⁴He. The system is constructed of very thin Kapton and Mylar foils reinforced with Kevlar material and features a differential pumping system. (orig.)

[en] The construction of a combined electron stretcher and storage ring operating at energies up to 0.9 GeV has recently started in Amsterdam. The ring will improve the specifications of the existing Medium Energy Accelerator (MEA) Facility of the Institute for Nuclear Physics and High Energy Physics Research (NIKHEF). This manuscript presents a summary of the vacuum system design of the ring. In order to achieve a 1 h beam life-time the vacuum pressure with a stored beam will have to be in the low 10^-8 mbar range. The major gas source is due to synchrotron radiation causing desorption from the stainless steel vacuum chamber walls. Because of the beam induced r.f. fields smoothness of the magnet vessels, monitors, beampipes and bellows is essential. Clearing electrodes are foreseen in order to avoid instabilities caused by ions produced by the beam in the residual gas. (author)

[en] The AmPs ring is a 900 MeV electron pulse stretcher and storage ring with a circumference of 212 m. The ring will be completed early 1992. Apart from the UHV envelope for the beam the ring contains many high precision components, e.g. 166 magnetic elements, 50 beam monitors ,an r.f. cavity, 2 injection kickers, etc. An overview is presented of the design philosophy and the construction with emphasis on the vacuum components as well as the alignment system and on the supports for the magnets and the monitors. Material of the vacuum components has been chosen on the basis of the requirement that outgassing, synchrotron radiation induced desorption, residual radioactivity and magnetic per-meability should be as low as possible. The vacuum chambers in the bending sections therefore are fabricated from stainless steel 316 LN with a very low cobalt content. An advanced welding and cleaning technique has been developed to avoid the inclusion of impurities. The vacuum pump capacity and the pump distribution along the ring has been optimised as a function of local conductances and outgassing. With 80 60 l/s ion pumps a net pump capacity of 20 l/s should be obtained. (author). 5 refs.; 7 figs

[en] The AmPS ring is a 900 MeV electron pulse stretcher and storage ring with a circumference of 212 m. An overview is presented of the design philosophy and the construction with emphasis on the vacuum components as well as on the alignment system and on the supports for the magnets and the monitors. The vacuum chambers in the bending sections are fabricated from stainless steel with a very low cobalt content. An advanced welding and cleaning technique have been developed to avoid the inclusion of impurities. The vacuum pump capacity and the pump distribution along the ring has been optimised as function of local conductances and outgassing. (author) 5 refs.; 7 figs

[en] To obtain electron beams with a high duty factor a stretcher and storage ring will be added to the existing Medium Energy Accelerator (MEA) facility. The ring will operate at energies between 250 and 900 MeV and with circulatinf currents up to 200 mA. The storage mode will be

[en] A new X-ray beamline has been built on the dipole magnet ''8'' of the Synchrotron Radiation Source (SRS). This beamline takes 40 mrad of horizontal aperture from an upstream tangent point where the source size is appreciably smaller, 4.5 mm x 1.2 mm fwhm. This beamline is designed to provide synchrotron radiation to five branch lines. Three of the branch lines (stations) are completed and initial scientific data is obtained. Some special features have been incorporated such as beam position detectors, built in laser system to align the optical components, high vacuum conditions along the whole line, retractable Be windows, a novel mirror bending system and a slitless high power high resolution monochromator for EXAFS. In this paper various aspects of the beamline are described. (orig.)

[en] The project 'Dubna Electron Synchrotron' (DELSY) is aimed to construct a synchrotron radiation source of the third generation at the Joint Institute for Nuclear Research. The DELSY synchrotron radiation source will be constructed on the base of the accelerator facility of the Institute for Nuclear Physics and High Energy Physics (NIKHEF), Amsterdam, The Netherlands. This accelerator facility consists of a linear electron accelerator Medium Energy Accelerator (MEA) for an electron energy of 700 MeV and the electron storage ring Amsterdam Pulse Stretcher (AmPS) for the maximum electron energy of 900 MeV at a circulating beam current of 200 mA. The DELSY storage ring is supposed to be constructed with the use of the AmPS (PAC, Chicago, 1989) storage ring, the focusing system of which will be essentially modified: the ring circumference will be approximately 1.5 times smaller, the electron energy will be increased up to 1.2 GeV and the focusing strength will be enhanced. These measures will allow one to obtain a beam emittance at least ten times smaller which subsequently increases the synchrotron radiation brilliance by several orders of magnitude. The rigging of the DELSY ring with the insertion devices--the superconducting wiggler with a magnetic field of 10 T and the so-called 'vacuum hybrid miniundulator' is the principal feature of the new synchrotron radiation source. Both devices developed by Budker INP, Novosibirsk, will allow one to enrich the characteristics of DELSY as a synchrotron radiation source, expanding its radiation spectrum in the region of the hard X-rays and increasing its brilliance up to 3x10¹⁸ photons/s/mm²/mrad²/0.1% b.w. Now this facility is being dismounted and transferred to JINR

[en] The project 'Dubna Electron Synchrotron' aims to construct a synchrotron radiation source of the third generation at the Joint Institute for Nuclear Research, Dubna, Russia