to this wheel so that they could be rotated into the beam one at a time preferably under computer control fig3 shows a preferred embodiment for computer control of the rotary wheels using computer or workstation 312 and tool controller 307 tool controller 307 could preferably contain logic for controlling the friction drive motors 107 using logic or analog lines 307 and 309 shown in accordance with the first and third rotary wheels in fig2 equipment for processing and amplifying the signals from a faraday cup in 303 or a camera or ccd signal from detector 310 using lines 306 or 311 respectively an algorithm in the workstation 312 could be used to process the radial positions of each and every one of the wheels shown in fig2 so that the proper degrader collimator diagnostic tool and chip would be in place before the beam stop is opened it is to be understood that the present invention in accordance with at least one presently preferred embodiment includes an arrangement for automatically altering a configuration of a main body adapted to hold a plurality of components which may be implemented on at least one general purpose computer running suitable software programs these may also be implemented on at.