Decay Rate Plot of Stored Beam Current and Touschek Limit of Current-Lifetime Product

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Abstract
It is demonstrated that the decay rate of the stored beam current I is a good means for indicating the gas-pressure conditions of a storage ring and the stored beam loss due to the Touschek effect. A new analytical method for evaluating the Touschek lifetime of the stored electron beam is also presented. The observed Touschek limit of the current-lifetime product I 0τ T is 5 Ah at 500 MeV for TERAS. This value is fifty times as large as the theoretical value. I 0τ T is proportional to the fourth power of the electron energy E and becomes of the order 0.12 Ah at 205 MeV. A computer-made decay-rate plot against I is very useful for indicating the decay modes and the 1/e lifetime of the stored beam current.

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