Abstract
This paper illustrates the realisation and testing of the multichannel far-infrared polarimeter for the RFX machine, a plasma confinement experiment with the Reversed Field Pinch configuration. The diagnostic is described and the its main sections are outlined: the laser system operating at λ = 118.8μm, the FIR optical line, the beam splitter and the beam detection units, the signal processing electronics and the motion electronics for the calibration halfwave plates. Emphasis is placed on the work performed on the polarimeter to make it operational. We illustrate the preliminary tests of the diagnostic equipment and the activity performed to bring the diagnostic into reliable operation, in particular the reduction of the noise produced by magnetically induced mechanical vibrations during machine shots. An example of the first Faraday angle measurements performed on five chords are presented and discussed. The measured Faraday angle was also compared to a theoretically calculated value, based on a simple plasma model, with satisfactory agreement between measured and predicted data.
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References
G. Rostagni, Fusion Eng. Des. 25 (1995) 301.
A. Buffa and E. Zilli, Istituto Gas Ionizzati, Internal Report 88/04 (1988).
A. Buffa, P. Innocente, S. Martini, M. Moresco, E. Spada and E. Zilli, Proceedings of the 16th European Conference on Controlled Fusion and Plasma Physics, Venice, Italy, 1989, (European Physical Society), Part IV, p.1493.
P. Innocente, S. Martini and E. Zilli, Istituto Gas Ionizzati, Internal Report 91/02 (1991).
E. Zilli, Istituto Gas Ionizzati, Internal Report 90/01 (1990).
E. Zilli, “Diagnostics for Contemporary Fusion Experiments”, Proceedings of the International School of Plasma Physics, Varenna, Italy, 1991 (Editrice Compositori, Bologna), p. 633.
S. L. Prunty, M.C. Sexton and E. Zilli, Int. J. Infrared and Millimetre Waves 12, 591, (1992).
M. Bagatin et al., Fus. Eng. Design 25 (1995) 425.
G. Gadani et al., Rev. Sci. Instrum. 66 (1995) 4613.
L. Giudicotti, et al., Proceedings of the 8th International Symposium on “Laser-Aided Plasma Diagnostics”, Doorwerth, The Netherlands, (1997), 293.
P. Innocente and S. Martini, Rev. Sci. Instrum. 63 (1992) 4996.
M. Moresco, R. O'Dubhghaill and E. Spada, Int. J. Infrared and Millimetre Waves 12 (1992) 609.
E. Marcolin, F. Milani, I. Molon, E. Zilli, Istituto Gas Ionizzati, Consorzio RFX Internal Report IGI 98/01, (1998).
E. H. Putley, The Pyroelectric Detector, from “Semiconductors and Semimetals”, R.K. Willardson and A.C. Beer Eds., Academic Press, N.Y., Vol. 5, (1970), pp.259-285.
M. Breda, et al. Istituto Gas Ionizzati, Consorzio RFX Internal Report IGI 2000/01, (2000).
S. Ortolani, Course on Mirror-based and Field-Reversed Approaches to Magnetic Fusion, International School of Plasma Physics, Varenna, Italy, 1983 (Monotypia Franchi, Città di Castello, Perugia, Italy, 1983), Vol.II, p.513.
H. Soltwisch, Nucl.Fusion 23,(1983) 1681.
P. Martin, et al. Phys.Plasmas 7, 1984 (2000)
P. Zanca, S. Martini, Plasma Phys. Control Fusion 41 (1999) 1251
A. Buffa et al.: Proceedings of the 21st European Conference on Controlled Fusion and Plasma Physics, Montpellier, France, 1994, (European Physical Society), Part II, p.458.
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Zilli, E., O'Gorman, M., Giudicotti, L. et al. Realization, Operation and Results of the Multichannel Far-Infrared Polarimeter on RFX. International Journal of Infrared and Millimeter Waves 21, 1673–1696 (2000). https://doi.org/10.1023/A:1006624012176
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DOI: https://doi.org/10.1023/A:1006624012176