Synchronization Process PSB example Synchronization using a Modulo

Synchronization Process PSB example Synchronization using a Modulo 360 o phase discriminator with adiabatic frequency changes 1

Synchronization Process u Only small frequency steps are tolerated Þ Df small when closing the loop or small loop gain Þ u Avoid the non-linear region of the Phase discriminator when closing the phase synchronization loop Þ Wait until DF crosses a value far enough from the non-linear point High loop gain Þ Solution chosen in the PSB: v v Impose Df before closing the synchro phase loop Wait until DF zero crossing to close the loop 2/04/2007 Section meeting A. Blas AB/RF/FB 2

Synchronization in the PSB Start Flat-Top Start Freq. Beating Start Phase Synchro. 2/04/2007 Section meeting A. Blas AB/RF/FB 3

Weaknesses of the PSB synchronization process. u It starts only at the extraction top field when the rf frequency is close enough to the reference value. u It lasts long to be adiabatic 2/04/2007 Section meeting A. Blas AB/RF/FB 4

What signals are available in the LEIR type digital beam control ? Real-time frequency and phase (with respect to the cavity rf) are available for the beam and the reference 2/04/2007 Section meeting A. Blas AB/RF/FB 5

Synchronization with the LEIR type beam control (#1) With this method, the system undergoes a transient at the loop closure 2/04/2007 Section meeting A. Blas AB/RF/FB 6

Synchronization with the LEIR type beam control (#2) No phase transient ! 2/04/2007 Section meeting A. Blas AB/RF/FB 7

Synchronization with the LEIR type beam control (#3) End Setup Start Setup Synchronization can be started any time without transient nor radial steering 2/04/2007 Section meeting A. Blas AB/RF/FB 8