Sine-fit procedure for unevenly sampled, multiply clocked signals

Milotti, E.

doi:10.1016/j.jcp.2004.07.005

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…The angular position of the magnet is measured by a set of 32 marks on the periphery of the supporting turntable. The identifier of each mark and its time of passage through a measuring station are also continuously recorded, so that nonuniformities of the rotation speed of the magnet can be corrected accurately in Fourier analysis of the data [17].…”

Section: Apparatus and Experimental Methodsmentioning

confidence: 99%

“…Several years of developments [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] have led to the present configuration of PVLAS. The experiment operates at LNL an ellipsometer with a sensitivity of some 10 -7 rad Hz -1/2 that is capable of measuring, with the use of the heterodyne technique, amplitude and phase of both ellipticity and dichroism.…”

Section: Introductionmentioning

confidence: 99%

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PVLAS : probing vacuum with polarized light

Zavattini¹,

Zavattini²,

Ruoso³

et al. 2007

Nuclear Physics B - Proceedings Supplements

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The PVLAS experiment operates an ellipsometer which embraces a superconducting dipole magnet and can measure ellipticity and rotation induced by the magnetic field onto linearly polarized laser light. The sensitivity of the instrument is about 10 -7 rad Hz. With a residual pressure less than 10 -7 mbar the apparatus gives both ellipticity and rotation signals at the 10-7rad level with more than 8 sigma sob ratio in runs that last about 1000 sec. These signals can be interpreted as being generated largely by vacuum ellipticity and dichroism induced by the transverse magnetic field. If this interpretation is correct, a tool has become available to characterize physical properties of vacuum as if it were an ordinary transparent medium. A microscopic effect responsible for this induced dichroism could be the existence of ultralight spin zero 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 inverse of the coupling constant to two photons would correspond to a mass M of the order of 10 6 GeV.

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Section: Apparatus and Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

PVLAS : probing vacuum with polarized light

Zavattini¹,

Zavattini²,

Ruoso³

et al. 2007

Nuclear Physics B - Proceedings Supplements

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show abstract

“…Collected data were subdivided in 100 s long records, for a total of 84 records at QWP 90 • and 121 records at QWP 0 • . Each record was then analyzed with a fitting procedure that compensates the mechanical jitter of the rotating table and the uneven sampling of the table position [13]. For each record, the procedure returns the x and y components of a vector in the amplitude-phase plane of the "±2ν m " sidebands; these components are Gaussian variates, and the procedure returns their statistical variances as well.…”

mentioning

confidence: 99%

Experimental Observation of Optical Rotation Generated in Vacuum by a Magnetic Field

et al. 2006

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We report the experimental observation of a light polarization rotation in vacuum in the presence of a transverse magnetic field. Assuming that data distribution is Gaussian, the average measured rotation is (3.9 ± 0.5) 10 −12 rad/pass, at 5 T with 44000 passes through a 1 m long magnet, with λ = 1064 nm. The relevance of this result in terms of the existence of a light, neutral, spin-zero particle is discussed.

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