Patent ID: 8280684
Filing Date: 2012-10-02
Classification: G01R,H05H

Abstract:
1. An apparatus for obtaining diagnostic information about a particle beam circulating in an accelerator, comprising: a) for at least one location on a circumference of a vacuum chamber comprising a part of the accelerator, at least one actuator disposed outside the vacuum chamber; b) for each actuator, at least one conducting electrode associated with it and disposed inside the vacuum chamber; c) for each conducting electrode, a lead connected thereto; d) at least one feedthrough on a surface of the vacuum chamber; and e) for each actuator, a shaft and connecting means disposed to connect the actuator outside the vacuum chamber to each conducting electrode inside the vacuum chamber associated with it; wherein the vacuum chamber encloses an evacuated region; wherein the vacuum chamber encircles a portion of an induction core; wherein the vacuum chamber comprises an electrically conductive portion and a non-conducting gap; wherein each conducting electrode communicates through the lead connected to it to information gathering means disposed outside the vacuum chamber, wherein each lead passes from inside the vacuum chamber to outside through a feedthrough; and wherein each conducting electrode is movable by means of rotation or lateral movement of the shaft connected to it, and is disposed to be movable from a first position where it does not intercept the particle beam circulating in the evacuated region in the vacuum chamber and accelerated by a voltage imposed across the non-conducting gap, to a second position where it intercepts the particle beam; and wherein in at least one of the first position and the second position, the conducting electrode is disposed so as to be in position to sense electromagnetically the particle beam.