DIAGNOSTICS FOR ULTRA-LOW EMITTANCE BEAMS*
DIAGNOSTICS FOR ULTRA-LOW EMITTANCE BEAMS*
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发表时间：
2011
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通讯作者：
Sr Monitors
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作者：
Sr Monitors
近年来，在许多电子存储环中实现了几皮米弧度垂直发射率的电子束，这对能够在这种情况下测量电子束尺寸的诊断提出了挑战。已经针对各种机器开发了许多不同的方法，例如激光线、干涉仪、Shintake 监视器、编码孔径、复合折射透镜。本演讲将回顾和比较不同的方法，并讨论它们的优点、缺点、最终局限性以及它们可能适用的情况；并考虑未来可能的方向。低发射光束 当前正在运行或建造中的低发射轻子环（其中一些列于表 1）已在很大程度上收敛到一组类似的参数：垂直发射率为 3-30 pmrad，能量为 1 到几个 GeV。大多数环上的光束尺寸在几微米到 10 微米的范围内，在对撞机或对撞机研究机器的情况下，在相互作用点处被压缩到几十纳米。 （注：意大利SuperB对撞机正在
The achievement in recent years of beams with vertical emittance of a few pico-meter-radians in a number of electron storage rings has presented challenges for diagnostics capable of beam size measurements in this regime. A number of different approaches have been developed for various machines, e.g., laserwire, interferometer, Shintake monitor, coded aperture, compound refractive lens. This presentation will review and compare the different methods, and discuss their strengths, weaknesses, ultimate limitations, and the situations where they might be appropriate; and consider possible future directions. LOW-EMITTANCE BEAMS The current generation of low-emittance lepton rings in operation or construction, a few of which are listed in Table 1, have converged to a remarkable extent to a similar set of parameters: vertical emittances of 3-30 pmrad, energies of one to a few GeV. The beam sizes over most of their rings are in the range of a few to 10 m, being squeezed down to a few tens of nm at the interaction point in the case of colliders or collider study machines. (Note: the SuperB collider in Italy is being