成大物理系徽
高能組博士班專題討論 (Seminar)
演講題目: The Status And Prospects Of The Q & A Experiment With Some Applications
演講人: 梅賢豪 博士
Dr. Hsien-Hao Mei
清大物理系
演講時間: 2009 年 4 月 16 日
星期四  下午 4 : 10
演講地點: 國家理論科學研究中心二樓演講廳(R203)
內容摘要:  
Abstract
We proposed our Q & A (QED[Quantum Electrodynamics] and Axion) experiment in 1991 [1] and started in 1994 [2] to probe vacuum and search for pseudoscalar-photon interaction [3-11]. In this apparatus a polarized light (wavelength 1,064 nm Nd-YAG laser) experiences a polarization rotation [12, 13] or becomes elliptical polarized [1, 14-18] after traveling through a transverse magnetically polarized zone with field strength B and length of interest L. The signal strength is predicted to be proportional to B and L to different powers by QED (B2L) [15], ALPs (Axion-Like Particles, B2L2) [3-11,19], MCPs (Milli-Charged Particles, B2/3L) [20, 21], or gaseous CMEs (Cotton-Mouton Effects, B2L) [22-24]. We introduces a pair of high-extinction-ratio (92.87 dB) [25] polarizers to probe the amplified ellipticity or polarization rotation change of light under such magnetic field by multiple reflections within a suspended high-finesse (F ~ 30,000) Fabry-Perot interferometer (FPI). The 3.45 m FPI prototype has accomplished the measurement of CME and Verdet effect of air at 1 atm under L = 0.23 m and B = 1 T [26], the CMEs of N2 at 2-50 Torr [27] and N2, O2, CO2, Ar, Kr at 0.5-300 Torr [28] under L = 0.6 m and B = 2.3 T, as well as our first result in vacuum dichroism for ALPs and MCPs [27]. Recently we are in our phase transition for setting up a new magnet with L = 1.8 m and B = 2.3 T within a 7 m FPI. Together with the current magnet and additional upgrades in laser system (wavelength 532 nm) and cavity finesse (F = 100,000), an improving factor of 27/107 is expected in measurements proportional to L/L2. Here we report on applications in gaseous CME/Verdet effect measurements [28]. Optical model [29] verification is undertaking through optimization of the residue intrinsic birefringence from cavity mirrors. Some prospects of the apparatus in the LSW (Light Shining-through Wall) experiment are discussed in the end.

References
[1] W.-T. Ni, K. Tsubono, N. Mio, K. Narihara, S.-C. Chen, S.-K. King, and S.-s. Pan 1991, Mod. Phys. Lett. A 6 3671.
[2] W.-T. Ni 1996, Chin. J. Phys. 34 962.
[3] W.-T. Ni 1973, A Nonmetric Theory of Gravity (Bozeman: Montana State University), preprint http://gravity5.phys.nthu.edu.tw/webpage/article4/index.html.
[4] W.-T. Ni 1974, Bull. Am. Phys. Soc. 19 655.
[5] W.-T. Ni 1977, Phys. Rev. Lett. 38 301.
[6] R. D. Peccei and H. R. Quinn 1977, Phys. Rev. Lett. 38 1440.
[7] S. Weinberg 1978, Phys. Rev. Lett. 40 233.
[8] F. Wilczek 1978, Phys Rev. Lett. 40 279.
[9] J. Kim 1979, Phys. Rev. Lett. 43 103.
[10] M. Dine et al 1981, Phys. Lett. B 104 1999.
[11] M. Shifman et al 1980, Nucl. Phys B 166 493.
[12] L. Maiani, R. Petronzio, and E. Zavattini 1986,Phys. Lett. B 175 359.
[13] G. Raffelt and L. Stodolsky 1988, Phys. Rev. D 37 1237.
[14] O. Halpern 1933 Phys. Rev. 44 855.
[15] E. Euler 1936, Ann der Phys. (Leipzig) 26 398; W. Heisenberg and E. Euler 1936, Zeits. Fur Phys. 98 714.
[16] Z. Bialynicka-Birula and I. Bialynicki-Birula 1970, Phys. Rev. D 2 2341
[17] S. L. Adler 1971, Ann. Phys. (USA) 67 599.
[18] E. Iacopini and E. Zavattini 1979, Phys. Lett. B 85 151.
[19] R. Cameron et al 1993, Phys. Rev. D 47 3707.
[20] B. Batell and T. Gherghetta 2006, Phys. Rev. D 73 045016.
[21] H. Gies, J. Jaeckel, and A. Ringwald 2006, Phys. Rev. Lett. 97 140402.
[22] A. Cotton, H. Mouton 1905, Ct. r. hebd. Seanc. Acad. Sci. Paris 141 317, 349.
[23] A. D. Buckingham, W. H. Prichard, and D. H. Whiffen 1967, Trans. Faraday Soc. 63 1057.
[24] C. Rizzo, A. Rizzo, D. M. Bishop 1997, Int. Rev. Phys. Chem. 16 81.
[25] H.-H. Mei, S.-J. Chen, and W.-T. Ni 2006, J. Phys.: Conf. Series 32 244.
[26] J.-S. Wu, W.-T. Ni, and S.-J. Chen 2004, Class. Quantum Grav. 21 S1259.
[27] S.-J. Chen, H.-H. Mei, and W.-T. Ni 2007, Mod. Phys. Lett. A 22 2815.
[28] H.-H. Mei, W.-T. Ni, S.-J. Chen, and S.-s. Pan 2009, Chem. Phys. Lett. 471 216.
[29] H.-H. Mei 2008, PhD Thesis (Hsinchu: National Tsing Hua University).