Abstract
A synchrotron radiation (SR) interferometer with Herschelian reflective optics has been developed for the measurement of beams of several $\ensuremath{\mu}\mathrm{m}$ in size. In a conventional refractive SR interferometer, the dispersion effect of the objective lens limits the instrument to a smaller range of beam-size measurements. To avoid this problem, we designed a Herschelian arrangement of reflective optics for the interferometer. The effectiveness of the reflective SR interferometer was confirmed at the KEK Accelerator Test Facility (ATF) damping ring. The measured vertical beam size obtained using the reflective SR interferometer was $4.7\text{ }\ensuremath{\mu}\mathrm{m}$ and the estimated vertical emittance was $0.97\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}\text{ }\mathrm{m}$.
Highlights
An extremely low-emittance beam is required for the international linear collider to increase the luminosity of high-energy physics experiments [1]
We have already succeeded in measuring a vertical beam size of 14 m in the damping ring (DR) using an synchrotron radiation (SR) interferometer [8,9]
We developed Herschelian reflective optics instead of refractive optics for the SR interferometer
Summary
An extremely low-emittance beam is required for the international linear collider to increase the luminosity of high-energy physics experiments [1]. The expected beam size at one location is 26 m and 5 m in the horizontal and vertical directions, respectively. We have already succeeded in measuring a vertical beam size of 14 m in the DR using an SR interferometer [8,9]. The SR interferometer with refractive optics showed a limitation in small beam-size measurements of around 7 m. This limitation is mainly due to the dispersion effect of the objective lens. The dispersion effect introduces a visibility change, especially in the case of small beam-size measurement. This problem cannot be solved by refractive optics using an optical lens. A result of emittance tuning using this monitor is described
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