用修正双晶技术诊断激光等离子体X射线极化度

研制了激光等离子体极化光谱仪, 用于诊断波长为0.2~20 nm的激光等离子体X射线的极化度并推断等离子体内部的各向异性状态。设计的谱仪在电子束垂直入射面内正交布置的色散元件均为PET晶体, 两通道均用成像板接收光谱信号, 其有效面积为30 mm×80 mm, 从光源经晶体到成像板的光程分别为980 mm和310 mm。在中国工程物理研究院激光聚变研究中心20 J激光器上进行固体靶实验, 获得了Al离子类氦谱线, 经过对类氦共振线和互组合线校正, 推算出两谱线的极化度分别为0.123 3和0.148 1。结果表明, 激光等离子体内部存在弱各向异性, 该谱仪适用于激光等离子体极化光谱的诊断。

Abstract

A polarized spectroscopy was designed and manufactured based on the laser-produced plasma experiments to diagnose the X-ray polarization of a laser-produced plasma in 0.2-20 nm. The experiment was performed at the 20 J laser facility in Research Center of Laser Fusion, China Academy of Engineering Physics (CAEP). In the experiment, Poly Ethylene Terephthalate(PET) crystals were used as dispersive elements in the two orthogonal directions and the imaging plates with the effective area of 30 mm×80 mm were taken as detectors. The optical paths of the X-ray beam were about 980 mm and 310 mm from the source to the detectors via the PET crystals, respectively. The X-ray spectrum emitted from the aluminum plasmas was recorded by the image plates. It shows that the polarization of the two Al Ⅻ spectra are about 0.123 3 and 0.148 1 after correcting helium resonance and combination spectrum. The experimental results demonstrate that there is anisotropic phenomenon in the laser-produced plasma, and the proposed method is effective to diagnosis of the polarized spectrum of high-temperature plasma.

参考文献

[1] 王淦昌、王淦昌全集第4卷, 惯性约束核聚变［M］. 石家庄：河北教育出版社, 2004.

WANG G CH.4th Wang Ganchang Collection, Inertial confinement fusion［M］.Shijiazhuang: Hebei Education Press, 2004.(in Chinese)

[2] 孙景文, 高温.离子体X射线谱学［M］. 北京:国防工业出版社, 2003.

SUN J W, GAO W. High Temperature Plasma X-ray Spectroscopy［M］. Beijing:National Defence Industry Press, 2003.(in Chinese)

[3] 江少恩, 丁永坤, 缪文勇, 等．我国激光惯性约束聚变实验研究进展［J］．中国科学G辑, 2009, 39(11):1571-1583.

JIANG SH E, DING Y K, MIAO W Y, et al..Recent progress of inertial confinement fusion experiments in China［J］.Science in China(Series G:Physics, Mechanics & Astronomy), 2009, 39(11):1571-1583.(in Chinese)

[4] BEIERSDORFER P, CRESPO LO′PEZ-URRUTIA J, DECAUX V, et al.. Polarization spectroscopy of X-ray transitions from beam-excited highly charged ions［J］. Rev. Sci. Instrum., 1997, 68 (1):1073-1077.

[5] CLOTHIAUX E J, OKS E, WEINHEIMER J, et al.. Measurement of the polarization of line profiles in the X-ray region and the diagnostic possibilities［J］.J.Quant. Spectrosc. Radiat.Transfer, 1997, 58(4-6):531-536.

[6] HITOKI Y, NOBORU H, SHU-ICHI K, et al.. Large anisotropy of the electron distribution function in the high-density plasma produced by an ultrashort-pulse UV laser［J］. Physical Review E, 1997, 56(1):998-991.

[7] TOHRU K, TAKESHI K, FUMIHIRO K, et al.. Polarization of He-radiation due to anisotropy of fast-electron transport in ultraintense-laser-produced plasmas［J］. Rev. Lett., 2007, 99:115003.

[8] WALDEN F, KUNZE H J, PETOYAN A, et al.. Polarization measurements of the Al Ⅻ resonance line emitted from micropinch plasmas of a vacuum spark discharge［J］.Phys. Rev. E, 1999, 59:3562.

[9] 赵孟春. 原子激发辐射光的极化［J］.光谱实验室, 1997, 14(5):8-12.

ZHAO M CH. Larization of radiation light from excited atom［J］.Chinese Journal of Spectroscopy Laboratory, 1997, 14(5):8-12.(in Chinese)

[10] TAKAHASHII N, ARAI S, KOUCHI N, et al.. Angular intensity distribution of Balmer-a emission excited by electron impact on H2［J］. J. Phys. B: At. Mol. Phys., 1983, 16：L547-L552.

[11] LOFFE A, MANOSHINB S. Larmor labelling by thin spin flippers with rotating magnetic field: simulations of performance of neutron scattering instruments［J］. Nucl. Instrum. Methods Phys. Res. A, 2004, 529(1-3):45-49.

[12] LAMOUREUX M, JACQUET L, PRATT R H. Angular distribution and polarization of the continuum emission in anisotropic plasmas［J］. Phys.Rev.A., 1989, 39(12):6323-6334.

[13] ROBBINS D L, FAENOV A Y, PIKUZ T A, et al.. Measurement of the polarization of the K-shell resonance line emission of S13+ and S14+ at relativistic electron beam energies［J］. Phys. Rev. A, 2004, 70:022715.

[14] ZHANG H L, SAMPSON D H, CLARK R E H. Relativistic cross sections for excitation of highly charged ions to specific magnetic sublevels by an electron beam［J］. Phys. Rev. A, 1990, 41(1):198-206.

[15] KIEFFER J C, MATTE J P, CHAKER M, et al.. X-ray-line polarization spectroscopy in laser-produced plasmas［J］. Rev. Sci. Instrum., 1993, 48(6):4648-4658.

[16] 熊先才, 钟先信, 肖沙里, 等.用于测量激光等离子体X射线的椭圆弯晶谱仪［J］.光学精密工程, 2006, 14(5):754-758.

XIONG X C, ZHONG X X, XIAO SH L, et al..Elliptically bent crystal spectrometer for measuring laser-produced plasma X-ray［J］.Opt. Precision Eng., 2006, 14(5):754-758.(in Chinese)

[17] 王洪建, 肖沙里, 施军, 等. 激光等离子体X射线极化光谱研究［J］. 光学精密工程, 2008, 16(15)：822-826.

WANG H J, XIAO SH L, SHI J, et al..X-ray polarization spectroscopy in laser-produced plasmas ［J］. Opt. Precision Eng., 2008, 16(5)：822-826.(in Chinese)

[18] 梁文锡, 李玉同, 徐妙华, 等. 成像板在超强激光与等离子体相互作用产生超热电子研究中的应用［J］. 中国科学G辑: 物理学力学天文学, 2009, 39(1): 37-42.

LIANG W X, LI Y T, XU M H, et al..Imaging plate in the interaction of intense laser-plasma of hot electrons in the application［J］.Science in China(Series G:Physics, Mechanics & Astronomy), 2009, 39(1): 37-42.(in Chinese)

[19] INAL M K, DUBAU J. Polarization of Fe xxv 1s2-1s2l lines: collisional resonances and radiative cascade contributions to 1s2l magnetic-sublevel excitation rates［J］.Phys. Rev. A, 1993, 47(6): 4794-4806.

[20] YUICHI I, HIROAKI N, MASAYUKI O, et al.. X-ray polarization spectroscopy for measurement of anisotropy of hot electrons generated with ultraintense laser pulse［J］. Rev. Sci. Instrum., 2004, 75(10):3699-3671.作者简介：

王洪建, 肖沙里, 施军. 用修正双晶技术诊断激光等离子体X射线极化度[J]. 光学精密工程, 2011, 19(12): 2821. WANG Hong-jian, XIAO Sha-li, SHI Jun. Diagnosis of X-ray polarized spectrum of laser-produced plasma by modified double-crystal method[J]. Optics and Precision Engineering, 2011, 19(12): 2821.

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