Electron multiplying devices and circuit arrangements therefor

Claim 1

AN ELECTRIC CIRCUIT ARRANGEMENT INCLUDING AN ELECTRON MULTIPLYING DEVICE COMPRISING A RADIATION SENSITIVE ELECTRON EMISSIVE CATHODE ON THE INNER SURFACE OF A DOMED SUPPORT, A FORAMINATED ELECTRODE SUBSTANTIALLY CO-EXTENSIVE WITH SAID CATHODE AND ARRANGED TO FACE SAID CATHODE AT A SUBSTANTIALLY UNIFORM DISTANCE THEREFROM, A DYNODE FOR RECEIVING ELECTRONS EMITTED FROM SAID CATHODE, ACCELERATING ELECTRODE MEANS AND DECELERATING ELECTRODE MEANS ARRANGED IN SUCCESSION AROUND THE PATH FROM SAID FORAMINATED ELECTRODE TO SAID DYNODE, AND MEANS FOR APPLYING POTENTIALS TO SAID CATHODE, SAID FORAMINATED ELECTRODE, SAID ACCELERATING ELECTRODE MEANS, SAID DECELERATING ELECTRODE MEANS AND SAID DYNODE SUCH THAT THE FORAMINATED ELECTRODE HAS A POTENTIAL WHICH IS POSITIVE WITH RESPECT TO SAID CATHODE, SAID ACCELERATING ELECTRODE MEANS HAS A POTENTIAL WHICH IS POSITIVE WITH RESPECT TO SAID FORAMINATED ELECTRODE, AND SAID DECELERATING MEANS AND SAID DYNODE HAVE POTENTIALS WHICH ARE POSITIVE WITH RESPECT TO SAID CATHODE BUT ARE NEGATIVE WITH RESPECT TO SAID ACCELERATING ELECTRODE MEANS, SAID POTENTIALS BEING PREDETERMINED TO SET UP A SUBSTANTIALLY UNIFORM RADIAL ELECTROSTATIC FIELD BETWEEN SAID CATHODE AND SAID FORAMINATED ELECTRODE TO CAUSE THE TRANSIT TIMES TO THE DYNODE OF ELECTRONS PROCEEDING RADIALLY FROM SAID CATHODE TO BE SUBSTANTIALLY EQUAL.