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A High Dynamic Range Bunch Purity Tool
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216 |
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- B. Joly, G.A. Naylor
ESRF, Grenoble, France
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The European synchrotron radiation facility uses a
stored electron beam in order to produce x-rays for the
study of matter. Some experiments make use of the time
structure of the x-ray beam which is a direct reflection of
the time structure in the electron beam itself. Avalanche
photo-diodes have been used in an x-ray beam in a photon
counting arrangement to measure the purity of single or
few bunch filling modes. Conventional techniques
measuring the photon arrival times with a time to
analogue converter (TAC) achieve dynamic ranges in the
10-6 range. We report here the use of a gated high count
rate device achieving a measurement capability of 10-10.
Such high purity filling modes are required in synchrotron
light sources producing x-ray pulses for experiments
looking at very weak decay signals as seen in M”ssbauer
experiments..
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