Laser cooling of one-component plasma and drive of troidal flow

单组分等离子体激光冷却及环形流驱动

基本信息

  • 批准号:
    15540472
  • 负责人:
  • 金额:
    $ 2.05万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    2003
  • 资助国家:
    日本
  • 起止时间:
    2003 至 2004
  • 项目状态:
    已结题

项目摘要

The purpose of this experiment is (1)to confine Ca^+ ions in a toroidal rf trap (the major radius is 40 mm) and achieve Coulomb coupling parameter Γ>1 by laser cooling and (2)to control a potential of the rf trap in a troidal direction to drive laser-cooled Ca^+ ions in the troidal direction.In order to cool Ca^+ ions, 397 nm and 866 nm radiation were produced by diode lasers with a grating-laser-stabilization systems, in which feedback stabilization from holographic grating in the Littrow configuration was used. The 397 nm laser light was produced by doubling the 794 nm light of a diode laser. For this purpose, an external enhancement cavity containing the nonlinear crystal (LBO) was used. The 397 nm and 866 nm laser beams were collinearly overlapped and focused tangentially on the trapped ions. The optical feedback phase and the frequency of the grating-stabilized 397 nm laser were simultaneously controlled by 1f and 3f electric feedbacks, respectively, using a proportional and integ … More ral(PI) feedback method. The frequency scan of nearly 5 GHz was achieved. The laser-induced fluorescence (LIF) of the 397 nm radiation was used for the detection of Ca^+ ions.We improved confinement of Ca^+ ions by changing an one-side-grounded(OG) rf trap to a center-grounded(CG) rf trap. When the OG rf trap was used, possibly due to a residual electric field caused by the charging of the rf trap, Ca^+ ions were confined in narrow regions of rf voltage(V_<RF>) and current(I_b) of electron-gun, by which Ca^+ ions are ionized. When the CG rf trap was used, the residual electric field was removed and confinement of Ca^+ ions were achieved in wide regions of V_<RF> and I_b. As a result, we have observed the reduction of both the number of confined ions and confinement time caused by the nonlinear-resonance effect. However, laser cooling of Ca^+ ions was not achieved since the confinement time at high vacuum, which is necessary in laser cooling, was short and ions were lost during the wavelength-scan of the 397 nm laser. Further improvement of rf trap is required. Less
本实验的目的是(1)将Ca^+离子限制在环形射频阱中(长半径为40 mm),并通过激光冷却实现库仑耦合参数Γ>1,以及(2)控制射频阱在回旋方向上的电势以驱动激光冷却的Ca^+离子在回旋方向上。利用光栅激光稳定系统,利用Littrow结构的全息光栅反馈稳定,通过二极管激光器产生397 nm和866 nm的辐射。397 nm的激光是通过将二极管激光器的794 nm的光加倍而产生的。为此,使用了包含非线性晶体(LBO)的外部增强腔。397 nm和866 nm的激光束共线重叠,切向聚焦在捕获的离子上。采用比例积分反馈法,分别用1f和3f电反馈同时控制光栅稳频397 nm激光器的光反馈相位和频率。 ...更多信息 PI反馈控制方法。实现了近5GHz的频率扫描。利用397 nm的激光诱导荧光(LIF)对Ca^+离子进行了检测,通过将一侧接地(OG)的RF阱改为中心接地(CG)的RF阱,改善了对Ca^+离子的限制。当使用OG射频阱时,可能由于射频阱充电产生的残余电场,Ca^+离子被限制在电子枪射频电压(V_<RF>)和电流(I_B)的狭窄区域内,Ca^+离子被电离。当使用CG射频阱时,残余电场被去除,Ca^+离子被限制在V_<RF>和I_B的宽范围内。结果,我们观察到的非线性共振效应所造成的限制离子的数量和限制时间的减少。然而,由于激光冷却所必需的高真空约束时间很短,并且在397 nm激光的波长扫描过程中离子会丢失,因此没有实现Ca^+离子的激光冷却。射频陷波器还需要进一步改进。少

项目成果

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SAKAWA Youichi其他文献

SAKAWA Youichi的其他文献

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{{ truncateString('SAKAWA Youichi', 18)}}的其他基金

Collisionless shock generation using large-scale laser systems
使用大型激光系统产生无碰撞冲击
  • 批准号:
    24340141
  • 财政年份:
    2012
  • 资助金额:
    $ 2.05万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Collisionless shock generation using high-power laser produced super-sonic plasma jet
使用高功率激光产生超音速等离子射流产生无碰撞冲击
  • 批准号:
    21340172
  • 财政年份:
    2009
  • 资助金额:
    $ 2.05万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Pulsed-laser ablation of hydrogen-dposited graphite target
氢沉积石墨靶材的脉冲激光烧蚀
  • 批准号:
    17540468
  • 财政年份:
    2005
  • 资助金额:
    $ 2.05万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Statistical properties of laser-cooled Ca ions in a quadrupole toroidal rf trap
四极环形射频阱中激光冷却 Ca 离子的统计特性
  • 批准号:
    13680555
  • 财政年份:
    2001
  • 资助金额:
    $ 2.05万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

相似海外基金

Two-Dimensional One Component Plasma and Non-Hermitian Random Matrices
二维单分量等离子体和非厄米随机矩阵
  • 批准号:
    1941742
  • 财政年份:
    2017
  • 资助金额:
    $ 2.05万
  • 项目类别:
    Studentship
Characteristics of laser cooled one component plasma
激光冷却单组分等离子体的特性
  • 批准号:
    07458091
  • 财政年份:
    1995
  • 资助金额:
    $ 2.05万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
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