1. Synchronization Process PSB example
Synchronization using a Modulo 360o phase discriminator with adiabatic frequency changes
2/04/2007 Section meeting
A. Blas AB/RF/FB

2. Synchronization Process
Only small frequency steps are tolerated
Df small when closing the loop
or small loop gain
Avoid the non-linear region of the Phase discriminator when closing the phase synchronization loop
Wait until DF crosses a value far enough from the non-linear point
High loop gain
Solution chosen in the PSB:
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

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

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

5. 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

6. 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

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

8. 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