An electrostatic quadrupole array for focusing 16 ion beams

Summary form only given. The ILSE (Induction Linac System Experiments) engineering study defined an applications of 16-beam electrostatic quadrupole focusing arrays. Since the assembly is made of several components whose fabrication tolerances tend to stack up, the tolerances of each part should be held close to ±0.0001 in. To determine the present day tolerances that can be achieved, a prototype quad array was fabricated and tested. Measurements showed that each electrode was located within 0.00001 to 0.00310 in. in x-y direction. The ILSE specification called for maximum deviation of 0.004 in. in x-y direction. The true center of the overall quad assembly was located within 0.00017 in. in the x-direction and 0.00002 in. in the y-direction compared with a theoretical origin of 0.0. The individual piece part´s dimensional tolerances were held to within 0.0005 in. The design and fabrication techniques used in this prototype development stage demonstrated the capability of meeting the ILSE tolerance requirements