A new type of multi-turn time-of-flight mass spectrometer was constructed,
consisting of four cylindrical electric sectors and 28 electric quadrupole
lenses, the size of the vacuum chamber being 60 x 70 x 20 cm. It was demons
trated that the mass resolution can be increased according to the number of
cycles of the ions through the ion optical system. Copyright (C) 2000 John
Wiley & Sons, Ltd.