Patent ID: 9721779
Date: 2017-08-01
CPC Classifications: G01N,H01J

Claim:
1. A Time of Flight mass analyser comprising: an annular ion guide having a longitudinal axis and comprising a first annular ion guide section and a second annular ion guide section; a first device arranged and adapted to introduce ions into said first annular ion guide section so that said ions form substantially stable circular orbits within said first annular ion guide section about said longitudinal axis; a second device arranged and adapted to orthogonally accelerate ions from said substantially stable circular orbits within said first annular ion guide section into said second annular ion guide section such that ions follow substantially spiral paths as they pass through said second annular ion guide section; and an ion detector disposed within said annular ion guide and having an ion detecting surface arranged in a plane which is substantially perpendicular to said longitudinal axis whereby the time of flight of the ions is measured.