在束流输运系统中,快速而精确地测定束流的发射度,对于提高束流传输效率、调节并保证束流达到预期的场所,是十分重要的。通常在测定束流发射度时采用移动缝隙法或电磁偏转方法。这些方法不仅需要附加一些较复杂的装置,而且测量时费时费力。特别是这些方法都必须采用缝隙装置,在测量时截留了大部分束流流强,因而必须强迫冷却,而在测量后,这些缝隙装置又带有很强的放射性。除了以上这些问题以外,由于束流在缝隙上的散射,又使测量结果的误差增大。Fermi实验室的E.R.Gray、CERN的G.Baribaud和C.Metzger曾用测量束流剖面的方法来测定束流的发射度。他们测量一段漂移空间内三点的 In the beam transport system, measuring the emittance of the beam quickly and accurately is very important for improving the beam transmission efficiency, adjusting and ensuring that the beam reaches the expected location. Usually used in the determination of beam emittance mobile gap method or electromagnetic deflection method. These methods not only require the addition of some more complex devices, but also time-consuming measurement. In particular, these methods require the use of a gap device that retains most of the beam current during the measurement and must therefore be forced to cool, which are again highly radioactive after the measurement. In addition to the above problems, the error of the measurement result increases due to the scattering of the beam in the gap. E.R. Gray of Fermi Labs, G. Baribaud and C. Metzger of CERN, used to measure the beam profile by measuring the beam profile. They measure three points in a drift space