Patent Number: 062918281
Section: claims

1. An electrode assembly (60) for an ion implanter (10), comprising: at least one electrode (84);  a housing (62) having a mounting surface (64) for mounting the assembly (60) to the implanter, said housing residing at a first electrical voltage;  at least one electrical lead (104) for providing electrical power to said at least one electrode (84), said at least one electrode residing at a second electrical voltage;  at least one electrically insulating member (92) for attaching said at least one electrode (92) to said housing (62), said electrically insulating member comprised of a glass-like material.  four electrodes (84a-84d) oriented radially outward from the axis (86), approximately 90.degree. apart from each other, such that a first pair of electrodes (84a and 84c) oppose each other approximately 180.degree. apart and reside at a first electrical voltage, and a second pair of electrodes (84b and 84d) also oppose each other approximately 180.degree. apart and reside at a second electrical voltage;  a housing (62) having a mounting surface (64) for mounting the assembly (60) to the implanter, said housing at least partially enclosing the four electrodes (84a-84d) and residing at a third electrical voltage;  a first electrical lead (104) for providing electrical power to said first pair of electrodes (84a and 84c);  a second electrical lead (108) for providing electrical power to said second pair of electrodes (84b and 84d); and  a plurality of electrically insulating members (92) formed of a glass-like material, comprising at least a first electrically insulating member for attaching said first pair of electrodes (84a and 84c) to said housing, and at least a second electrically insulating member for attaching said second pair of electrodes (84b and 84d) to said housing. 2. The assembly (60) of claim 1, wherein said electrically insulating member (92) is comprised of quartz (SiO.sub.2). 3. The assembly (60) of claim 1, wherein said electrically insulating member (92) is comprised of a heat resistant and chemical resistant glass material. 4. The assembly (60) of claim 3, wherein said insulating member (92) is comprised of Pyrex.RTM.. 5. The assembly (60) of claim 1, wherein said electrode assembly is a quadrupole lens through which an ion beam (15) passes during operation of the ion implanter (10), wherein said at least one electrode (84) comprises four electrodes (84a-84d), wherein said at least one electrical lead comprises a first lead (104) for electrically energizing a first pair of electrodes (84a and 84c) and a second lead 108 for electrically energizing a second pair of electrodes (84a and 84c), and wherein said at least one electrically insulating member (92) comprises at least a first member for connecting said first pair of electrodes to said housing and at least a second member for connecting said second pair of electrodes to said housing. 6. The assembly (60) of claim 5, wherein said quadrupole lens is positioned within a radio frequency (RF) linear accelerator (18) in the ion implanter 10. 7. The assembly (60) of claim 5, wherein said first pair of electrodes operates at approximately +20 kilovolts (KV) and said second pair of electrodes operates at approximately -20 KV, and said housing (62) is electrically grounded. 8. The assembly (60) of claim 5, wherein said electrodes (84a-84d) are comprised of graphite, and wherein said first and second electrically insulating members (92) comprise a plurality of electrically insulating standoffs that attach said electrodes to said housing (62). 9. The assembly (60) of claim 8, wherein said plurality of electrically insulating standoffs (92) resist accumulation of graphite sputtered off of said electrodes (84a-84d) as the ion beam passes through said quadrupole lens. 10. An electrostatic quadrupole lens assembly (60) for an ion implanter (10) having an axis (86) along which an ion beam passes, comprising: 11. The assembly (60) of claim 10, wherein said plurality of electrically insulating members (92) are comprised of quartz (SiO.sub.2). 12. The assembly (60) of claim 10, wherein said plurality of electrically insulating members (92) are comprised of a heat resistant and chemical resistant glass material. 13. The assembly (60) of claim 12, wherein said plurality of electrically insulating members (92) are comprised of Pyrex.RTM.. 14. The assembly (60) of claim 10, wherein said first pair of electrodes operates at approximately +20 kilovolts (KV) and said second pair of electrodes operates at approximately -20 KV, and said housing (62) is electrically grounded. 15. The assembly (60) of claim 10, wherein said electrodes (84a-84d) are comprised of graphite, and wherein said plurality of electrically insulating members (92) comprises a plurality of electrically insulating standoffs that attach said electrodes to said housing (62). 16. The assembly (60) of claim 15, wherein said plurality of electrically insulating standoffs (92) resist accumulation of graphite sputtered off of said electrodes (84a-84d) as an ion beam passes through said quadrupole lens.