Low Level RF Workshop 2013

Session

Session 2: SRF & Piezo

4 Oct 2013, 10:40

22. Development and Test of Digital LLRF Control Procedures and Techniques in Scope of ILC

Mr Mathieu Omet (Graduate University for Advanced Studies)

04/10/2013, 10:40

Oral

In order to operate the superconducting cavities at the International Linear Collider (ILC) near their maximum gradients, cavity input (PK) and cavity loaded Q (QL) have to be controlled individually (PKQL control). In this scope a fully automated PKQL operation procedure was developed and demonstrated at cavity gradients of 16 MV/m and 24 MV/m with Q_L values of 9e6 and 3e6 at the linear...

20. Application of Active Disturbance Rejection Control in Superconducting Radio Frequency Cavities

Dr Shen Zhao (Facility for Rare Isotope Beams, Michigan State University)

04/10/2013, 11:05

Oral

In this talk, the previous results on the mitigation of microphonics using Active Disturbance Rejection Control (ADRC) is briefly reviewed first to show the benefit of this new control method, followed by the introduction of ADRC in more details. Then the application of ADRC at Facility for Rare Isotope Beams (FRIB)/ National Superconducting Cyclotron Laboratory (NSCL) to other problems, such...

82. Piezo characterization, tests and operation at FLASH

Dr Mariusz Grecki (DESY)

04/10/2013, 11:30

Oral

The superconducting cavities operated at high Q level need to be precisely tuned to the RF frequency. The TESLA cavities at FLASH accelerator are tuned using slow (step motors tuners) and fast (piezo tuners) driven by the control system. The goal of this control system is to keep the detuning of the cavity as close to zero as possible even in the presence of disturbing effects (Lorentz force...