Theoretical analysis and experimental validation of double wedge tuner performance at cryogenic temperature

A new type of tuner with double wedge mechanism for tuning of cryo-module cavity has been theoretically analyzed and tested at CDM, BARC. The tuner is a candidate for incorporation in International Linear collider (ILC) operations for tuning and micro-phonics stabilization of RF cavities by changing its length. Mathematical model of tuner performance has been developed for performance estimation at different temperatures. The system has been characterized for various temperatures and its performance has been tested at lower temperatures. In this paper, the performance characteristics of tuner and its dependence on various factors like tuner material, manufacturing and assembly parameters, external environment including external temperature and resistive forces has been discussed. It also describes the low temperature testing of the system.