Spin Echo and Interference in Synchrotrons Alex Chao 1 JUMP CROSSING A DEPOLARIZATION

Spin dynamics in crossing a single depolarization resonance is a well-studied subject. One well-known example is that of Froissart and Stora in 1960 [1]. More is needed to complete the understanding, particularly of the transient effects, when crossing a single resonance [2]-[4], but question arises what happens if we cross two resonances or cross a single resonance twice. When a resonance is crossed twice, the particle’s spin dynamics encounters two additional phenomena. First, the two crossings will interfere with each other, leading to an interference effect. Second, there will be a spin echo effect. We discuss these two effects in this report. Two proposals to test these effects experimentally are made at the end. Presented at the 17-th International Spin Physics Symposium Kyoto, Japan October 2-7, 2006 SLAC-PUB-12228 November 2006