Shutter designed to block high-energy particle beams

Claim 1

A shutter for a high-energy particle beam, which makes it possible to close off an opening formed in a wall of a given thickness, comprising a metal block K of cylindrical form having a radius R and an axis XX, said block K being equipped at each of its ends and on the axis XX, with pivots, said block K being arranged in a cylindrical metal cage closed at its ends respectively by a first plate and by a second plate, each of said plates being equipped with a central hole in which there can engage one said pivots of the block K, and with an eccentric hole, said eccentric holes being disposed mutually opposite one another and having a common axis YY parallel to the axis XX of said central hole located at an interval L therefrom, said cylindrical block K being provided with longitudinal passage of cylindrical form, having a diameter d and axis Y 1 Y 1 parallel to said axis XX and located at an interval L from the latter, and also containing a blind hole, referred to as a "pit," having a diameter substantially equal to said diameter d and having an axis Y 2 Y 2 parallel to said axis XX and symmetrical with said axis Y 1 Y 1 in relation to said axis XX, said distance L being chosen in such a fashion that the relationship: ##EQU3## is satisfied.