Working Principle
The ion bunch from REXTRAP is slowed down in a pulsed drift cavity in the vertical beamline. After this the bunch is injected into the 9 T magnetic field. Here the ion cloud is trapped in the first Penning trap (for cooling). Its purpose is to cool down the ions with buffer gas. In this trap, it is possible to apply different excitation modes (dipolar, quadrupolar and octupolar). The ions are then transferred to the second Penning trap (in which decays are studied).
When an ion decays, it can escape the decay trap into the spectrometer. The spectrometer consists out of a set of electrodes to create an electrical potential barrier. If the decayed ion's energy is high enough, it will be able to overcome this barrier to be detected at the top of the setup.
Read more about this topic: WITCH Experiment
Famous quotes containing the words working and/or principle:
“Dad, if you really want to know what happened in school, then you’ve got to know exactly who’s in the class, who rides the bus, what project they’re working on in science, and how your child felt that morning.... Without these facts at your fingertips, all you can really think to say is “So how was school today?” And you’ve got to be prepared for the inevitable answer—”Fine.” Which will probably leave you wishing that you’d never asked.”
—Ron Taffel (20th century)
“The only principle that does not inhibit progress is: anything goes.”
—Paul Feyerabend (1924–1994)