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Your search keyword '"Di Domenico, G."' showing total 6 results
Start Over Author "Di Domenico, G." Topic magnetic fields
6 results on '"Di Domenico, G."'

2. PVLAS RESULTS ON LASER PRODUCTION OF AXION-LIKE DARK MATTER CANDIDATE PARTICLES.

Author

ZAVATTINI, E., ZAVATTINI, G., RUOSO, G., POLACCO, E., MILOTTI, E., KARUZA, M., GASTALDI, U., DI DOMENICO, G., VALLE, F. DELLA, CIMINO, R., CARUSOTTO, S., CANTATORE, G., and BREGANT, M.

Subjects
AXIONS, DARK matter, PARTICLES (Nuclear physics), VACUUM energy (Astronomy), PHOTON-photon scattering, MAGNETIC fields, ELLIPSOMETERS
Published
2005

3. The PVLAS collaboration: Experimental search for anisotropy of the phase velocity of light in vacuum due to a static magnetic field.

Author

Zavattini, E., Brandi, F., Bregant, M., Cantatore, G., Carusotto, S., Della Valle, F., Di Domenico, G., Gastaldi, U., Milotti, E., Pengo, R., Petrucci, G., Polacco, E., Ruoso, G., and Zavattini, G.

Subjects
MAGNETIC fields, QUANTUM electrodynamics
Abstract

After a brief description of the now operating PVLAS apparatus and of its goals, we present and discuss the preliminary experimental results obtained from the first recent measurement runs conducted with the complete setup. [ABSTRACT FROM AUTHOR]

Published
2001

4. 2D Laser Collimation of a Cold Cs Beam Induced by a Transverse B Field.

Author

Plimmer, M. D., Castagna, N., Di Domenico, G., Thomann, P., Taichenachev, A. V., and Yudin, V. I.

Subjects
LASER cooling, COOLING, LASERS, MAGNETIC fields, FIELD theory (Physics), PHYSICS
Abstract

We describe transverse collimation of a continuous cold cesium beam (longitudinal temperature 75 μK) induced by a two-dimensional, blue-detuned near-resonant optical lattice. The mechanism described for a lin-||-lin configuration is made possible by the application of a transverse magnetic field B⊥. The phenomenon described differs from gray molasses, for which any small magnetic field degrades cooling, as well as from magnetically induced laser cooling in red-detuned optical molasses, where there are no dark states. The lowest transverse temperature is experimentally found to vary as B⊥2. The collimated flux density shows a dip as a function of B⊥, the width of which is proportional to the cube root of the laser intensity, general features predicted by our semiclassical model. This technique provides a sensitive tool for canceling transverse magnetic fields in situ at the milligauss level. © 2005 Pleiades Publishing, Inc. [ABSTRACT FROM AUTHOR]

Published
2005
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5. A new optical magnetometer for MCG measurements in a low-cost shielding room

Author

Bison, G., Schläpfer, U., Di Domenico, G., Saudan, H., and Weis, A.

Subjects
*MAGNETOMETERS, *MAGNETIC fields, *MAGNETIC instruments, *MAGNETIC variometers
Abstract

Abstract: In the past years we were able to show that room temperature optical magnetometers based on magnetic resonance in atomic vapors can be used to measure magnetocardiographic (MCG) signals of healthy adults. The objective of our ongoing work is to demonstrate that multichannel arrangements of affordable and maintenance-free optical magnetometers can be operated in clinical settings. On the way to that goal we studied a new optical magnetometry scheme using linearly polarized light. We also investigated the possibility to operate such magnetometers in inexpensive magnetic shielding rooms based on aluminum. [Copyright &y& Elsevier]

Published
2007
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6. Experimental observation of vacuum birefringence

Author

Zavattini, E., Zavattini, G., Temnikov, P., Ruoso, G., Raiteri, G., Polacco, E., Milotti, E., Karuza, M., Gastaldi, U., Di Domenico, G., Della Valle, F., Cimino, R., Carusotto, S., Cantatore, G., and Bregant, M.

Subjects
*PARTICLES (Nuclear physics), *MAGNETIC fields, *VACUUM, *BOSONS
Abstract

Abstract: The PVLAS experiment operates an ellipsometer based on a Fabry-Perot optical cavity that embraces a superconducting rotating dipole magnet and can measure the ellipticity induced by the magnetic field onto linearly polarized laser light. With a residual pressure less than 10−7 mbar the apparatus gives ellipticity signals at the level of 10−11 rad per passage through 1 m of 5 Tesla transverse magnetic field of 532 nm wavelength laser light. These signals can be interpreted as being generated largely by vacuum birefringence. If this interpretation is valid, a tool has become available to characterize physical properties of vacuum as if it were an ordinary transparent medium. The main source of the induced ellipticity could be the existence of ultralight bosons with mass of the order of 10−3 eV that would couple to two photons and would be created in the experiment by interactions of photons of the laser beam with virtual photons of the magnetic field. The apparatus is calibrated in amplitude and in phase by measuring Cotton-Mouton ellipticity in gases. The ellipticity induced in vacuum has phase opposite to that of the CME ellipticity induced with noble gases in the interaction region. If the ellipticity signals observed in vacuum are due to authentic quantum vacuum birefringence and not to the apparatus, and a microscopic interpretation of the effect in terms of existence of spin zero ultralight bosons is valid, the observed phase of the ellipticity implies a positive parity of the bosons. The ultralight bosons would then be scalars. [Copyright &y& Elsevier]

Published
2007
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