TFTR neutral beam bellows redesign and calorimeter upgrade

The TFTR (Tokamak Fusion Test Reactor) has experienced calorimeter bellows failures at lower duty cycles than anticipated. The history of the problems, and the analysis and testing that went into the solution of the problems within present design constraints are described. Guidelines for future bellows designs of this type and application (long stroke and vertical operation) are presented. Improvements incorporated in the other components associated with the calorimeter assembly are also described