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We demonstrate an atom detector based on field ionization and subsequent ioncounting. We make use of field enhancement near tips of carbon nanotubes toreach extreme electrostatic field values of up to 9x10^9 V/m, which ionizeground state rubidium atoms. The detector is based on a carpet of multiwallcarbon nanotubes grown on a substrate and used for field ionization, and achannel electron multiplier used for ion counting. We measure the fieldenhancement at the tips of carbon nanotubes by field emission of electrons. Wedemonstrate the operation of the field ionization detector by counting atomsfrom a thermal beam of a rubidium dispenser source. By measuring the ionizationrate of rubidium as a function of the applied detector voltage we identify thefield ionization distance, which is below a few tens of nanometers in front ofnanotube tips. We deduce from the experimental data that field ionization ofrubidium near nanotube tips takes place on a time scale faster than 10^(-10)s.This property is particularly interesting for the development of fast atomdetectors suitable for measuring correlations in ultracold quantum gases. Wealso describe an application of the detector as partial pressure gauge.

Integrated Atom Detector Based on Field Ionization near Carbon Nanotubes