上游充通大兽 From Synchrotrons to Storage Rings SHANGHAI JIAO TONG UNIVERSITY THE REVIEW OF SCIENTIFIC INSTRUMENTS Letters to the Editor Prompt publication of brief reports of NEW ideas in measurement and instrumentation or comments on papers appearing in this Journal may be secured by addressing them to this department.No proof will be sent to the authors.Communications should not exceed 500 words in length.The Board of Editors does not hold itself responsible for the opinions expressed by the correspondents. Use of Synchrotron Orbit-Radiation in X-Ray Physics* L.G.PARRATT Cornell University,Ithaca,New York (Received December 1,1958) paee四h the orbit of a high-energy synchrotron.:Comparison is made here of the prospective usefulness of this radiation in the range of wavelengths 0.1 to 20 A with the x-rays obtainable from a conventional x-ray tube. I.Calculations of the spectral distribution for three typical synchrotron energies and orbit radii are shown in Fig.1.2.The spectral power is shown averaged over one-half of an acceleration cycle in which the electron energy is taken as proportional to the square of a sinusoid. The power is expressed in ergs per second per 4 solid angle per x unit per electron,and must be trimmedFrom Synchrotrons to Storage Rings 5