Quartz quadrupole for mass filter

Details Quartz quadrupole for mass filter Quartz quadrupole for mass filter

1988-03-28

1989-12-05

Boudreau, Leo H.

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For plural electrodes of discharge device

250281, 250292, 250293, H01J 188

Patent

active

048855006

ABSTRACT:
A quartz quadrupole comprises a quartz substrate, conductive strips and low-conductivity strips. The substrate includes hyperbolic inner surfaces which provide the geometry for the conformed conductive strips to produce an appropriate electric field for mass filter operation. The use of quartz as a substrate material provides the thermal and electrical characteristics required by high performance mass filtering operations, including scanning mode operation to 800 amu and above. During such operation, potential field distortions by accumulated charge in cusp sections of the substrate are minimized by the low-conductivity strips, which are arranged to overlap longitudinal edges of the conductive strips. Formation of the quartz substrate is made possible by high precision machining, grinding and polishing of a refractory metal mandrel. The actual step of forming the substrate is simplified by the low thermal coefficient of expansion of the quartz. The conductive strips are applied by firing metal-glass frit tape. The low-conductivity strips are applied by firing a metal-oxide slurry including a bonding agent.

REFERENCES:
patent: 3757115 (1973-09-01), Ball
patent: 3819941 (1974-06-01), Carrico
patent: 4032782 (1977-06-01), Smith et al.
patent: 4106744 (1978-08-01), Lawrence, Jr. et al.
patent: 4117321 (1978-09-01), Meyer
"Materials and Techniques for Electron Tubes", by Kohl, General Telephon & Electronics, Technical Series 1960, TK 6565.V3.K65 C4, pp. 20-68.

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