Regularities of Weak Gravitational Interactions pra-0071

Full Title Experimental Study of the Regularities of Weak Gravitational Interactions Tech Area / Field

PHY-OTH: Physics / Other

Brief Description of Technology The studies using the experimental setup "Sphere" can be carried out in the field of weak gravitational interactions for the refinement of Newton’s law of gravitation, for the reproduction of extremely small accelerations arising from the motion of spacecraft, for the reproduction of extremely small parameters of seismic oscillations induced by remote seismic events (low power underground nuclear explosions etc.).

The setup reproduces flat homogenous fields with extremely small adjustable parameters: the range of reproduced gravitational accelerations is from 10^-10 to 10^-8 g; the frequency range is 10^-3 - 1 Hz. The setup is located in a suburb of Saint Petersburg (Lomonossov) and is set in a thermostatic box standing on an interference-proof monolithic foundation with a mass of 3,500 tons, which enables the level of external disturbances to be reduced by more than two times.

Unique precise aerostatic bearings have been applied in the construction of the experimental setup. Thanks to this, a precise rotation platform, which can stabilize the position of a gravitational field-source with an angular uncertainty of less than 0.1 - 0.01 ang.s (depending on the value of the reproduced parameter), is included in the setup.

An electric drive-system ensures the stability of angular velocity of the gravitational field-source at the level of 10. Hypersensitive gravi-inertial instruments have been used in the study of the setup parameters.

Legal Aspects Rubin V.N., Sinelnikov A.Ye. AC No 1756844, BI, 1992, No 3.

Special Facilities in Use and Their Specifications Special monolithic foundation with a mass of 3,500 tons.

Scientific Papers Rubin V.N., Sinelnikov A.Ye. AC No 1756844, BI, 1992, No 3.

Krivtsov Ye.P., Sinelnikov A.Ye. New Trends in Mechanical Measurement Metrology. European Scientific Metrological Conference, Abstracts, St. Petersburg, Russia, 1992.

Krivtsov Ye.P, Sinelnikov A.Ye., Yankovsky A.A. New Directions of Metrological Studies in the Field of Mechanical Measurement. Izmeritelnaya Teknika, 1993, No3, p.29.

Tarbeyev Yu.V., Krivtsov Ye.P., Sinelnikov A.Ye., Yankovsky A.A. A New Method for the Absolute Calibration of High-Sensitivity Accelerometers and Other Gravi-inertial Devices. Bulletin of the Seismological Society of America, Vol.84, No.2, pp. 438-443, April 1994.

Ecr Sources of Soft X-ray Emissions pra-0072

Full Title ECR Sources of Soft X-ray Emissions Tech Area / Field

PHY-PLS: Physics / Plasma Physics

MAT-SYN: Materials / Materials Synthesis and Processing

INF-ELE: Information and Communications / Microelectronics and Optoelectronics

Brief Description of Technology Presented here are the results of experimental investigations into a powerful X-ray emission from plasma created by a pulse microwave ECR discharge in a simple mirror trap. According to contemporary ideas, an essential improvement in ECR source characteristics (particularly more powerful emissions) may be achieved by increasing the pumping frequency and, as a result, the corresponding plasma density in the discharge. From this point of view, ECR discharges sustained by a powerful millimeter-wave radiation of contemporary gyrotrons is of particular interest. The following were used to heat the plasma under ECR conditions: a pulse gyrotron with a maximum power of W=130 kW, and frequency of f=37.5 GHz; a pulse duration of up to 1 ms. The plasma was confined in a mirror trap with a mirror ratio of 3.2. The gas pressure exceeded a level of 310^-5 Torr. The X-ray emission was studied by fully calibrated p-i-n diodes with varying spectral sensitivities, plus a set of filters. Under optimal conditions, the average X-ray power of the ECR discharge amounted to 10 kW. That level corresponded to an efficiency of about 10 percent for microwave beam conversion into X-rays. The main contribution to the X-ray conversion resulted from emission in a region of 7 nm. The estimates show that X-ray emissions may be linked to the line emissions of multiply-charged ions.

Legal Aspects None.

Special Facilities in Use and Their Specifications None.

Scientific Papers S.V. Golubev, V.G. Zorin, Yu. Ya. Platonov, S.V. Razin. “Soft X-ray Emission from Millimeter-Wave Electron-Cyclotron Resonance Discharge.” Journal of X-ray Science and Technology, 6, 244-248 (1996).