Mass analyzer lenses - TSQ Quantis Plus MS - TSQ Fortis Plus MS - TSQ Series - TSQ Altis MS - TSQ Quantis MS - TSQ Altis Plus MS - TSQ Fortis MS - Mass analyzer lenses - TSQ Quantis Plus MS - TSQ Fortis Plus MS - TSQ Series - TSQ Altis MS - TSQ Altis MS - TSQ Quantis MS - TSQ Quantis MS - TSQ Altis Plus MS - TSQ Fortis MS

The quadrupole region (Q1, Q2, and Q3 chambers) has three lens sets:

• The lenses between Q1 and Q2 are designated as EL21, EL22, and EL23.
• The lenses between Q2 and Q3 are designated as EL31, EL32, and EL33.
• The lens between Q3 and the ion detection system is designated as EL4.

Circular holes in the center of the lenses allow the ion beam to pass through.

The lens assemblies also retain the three rod assemblies to ensure accurate and automatic axial alignment of the rod assemblies.

The EL2x lens set (between quadrupoles Q1 and Q2) and the EL3x lens set (between quadrupoles Q2 and Q3) serve the following functions:

• To minimize the amount of collision gas that enters the main quadrupole chamber (Q1 and Q3) from the collision cell (Q2).
• To shield Q1 from the RF voltage applied to Q2 and vice versa (EL2x lens set) and to shield Q3 from the RF voltage applied to Q2 and vice versa (EL3x lens set).
• To focus the ion beam: The three lenses between Q1 and Q2 (and those between Q2 and Q3) together form a three-element aperture lens.

Lens EL4 is located between Q3 and the ion detection system. Lens EL4 has its own wire in the system and is at ground potential. Its purpose is to shield Q3 from the high voltage applied to the ion detection system and to shield the ion detection system from the high RF voltages applied to Q3.