Speaker
Description
Superconducting RF crab cavities will be implemented in the upcoming High-Luminosity LHC upgrade to compensate the luminosity loss due to a large crossing angle at the interactions points. In order to be beneficial for luminosity, the crab cavity system must have extremely good RF noise performance, else the emittance blow-up from its own noise may further degrade the luminosity.
Required noise performance of the Low-level RF and High-power RF systems is beyond the limit of what is possible with current technology.
An active "noise feedback" in the LLRF system was therefore proposed to help mitigate the emittance growth from the crab cavity system. We present the challenges of very demanding noise feedback LLRF system design, proposed processing algorithms and preliminary results from the proof of concept testing phase.
The challenge is not only the ultra low noise digitizer with large bandwidth and low ENOB converters, but also implementing a high performance, strictly beam synchronous bunch by bunch measurement into an asynchronous, fixed clock LLRF system.
| Abstract Category | Measurement and Control |
|---|
