Speaker
Dr
Harald Klingbeil
(GSI RF Department)
Description
A cavity synchronization system has been realized which allows the synchronization
of the gap signals
of different cavities. The system is designed in such a way that the cavities may
run at different
harmonics. In future it will also be possible to synchronize the cavity with the
beam, i.e. to realize
closed-loop beam phase control.
In order to fulfill these requirements, the overall system is based on different
scalable modules which
can flexibly be used in completely different applications. The key modules are the
following ones:
* DSP System: This subsystem is used for high-precision phase and amplitude
detection and fast
closed-loop control algorithms. It includes analog preprocessing in the IF range,
ADC and DAC modules,
suitable digital interfaces and comfortable diagnostics features.
* FPGA Interface Board (FIB): This module provides an interface to the central
control system and several
other interfaces which are used as a standard in the GSI synchrotron RF group.
The interface protocols
are realized by an FPGA which allows one to implement routing, control and signal
processing
applications.
* DDS unit: This module is used for the generation of RF master signals and can
also be used as
actuator in a closed loop RF control. Furthermore, it will be used in future to
realize the
functionality which is currently performed by an analog offset LO (local
oscillator). The DDS module
is realized by combining an FIB with a dedicated piggyback PCB.
These key modules are described here. Furthermore, the status of the following
applications is reported:
* Digital cavity synchronization for single-harmonic operation
* Dual harmonic operation
Finally, an outlook to other applications is given.
Author
Dr
Harald Klingbeil
(GSI RF Department)
