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The remaining obstacle is measuring the rate of Touschek scattering. There are three obvious ways to do this: Measure the current of the beam (its derivative is the loss rate), use scintillation monitors which register a pair of Touschek scattered electrons outside of the vacuum chamber or measure the beam intensity by analyzing the signal from the beam position monitors (BPMs). The former methods were used in our experiments. The beam current and lifetime were used to monitor the change of Touschek losses and the scintillation counters were used to monitor loss rates of Touschek scattered electron pairs.


Simon Leemann