A thin wire ion trap to study ion–atom collisions built within a Fabry–Perot cavity
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We report on the implementation of a thin wire Paul trap with tungsten wire electrodes for trapping ions. The ion trap geometry, though compact, allows large optical access enabling a moderate finesse Fabry–Perot cavity to be built along the ion trap axis. The design allows a vapor-loaded magneto-optical trap of alkali atoms to be overlapped with trapped atomic or molecular ions. The construction and design of the trap are discussed, and its operating parameters are determined, both experimentally and numerically, for Rb+. The macromotion frequencies of the ion trap for 85Rb+ are determined to be f r = 43 kHz for the radial and f z = 54 kHz for the axial frequencies, for the experimentally determined optimal operating parameters. The destructive off axis ion extraction and detection by ion counting is demonstrated. Finally, evidence for the stabilization and cooling of trapped ions, due to ion–atom interactions, is presented by studying the ion-atom mixture as a function of interaction time. The utility and flexibility of the whole apparatus, for a variety of atomic physics experiments, are discussed in conclusion.
KeywordsCold Atom Trap Depth Paul Trap Channel Electron Multiplier Resonant Charge Exchange
The authors acknowledge Prof. E Krishnakumar, TIFR, Mumbai for technical assistance. Arijit Sharma and Ravi K. are acknowledged for useful discussion and thoughtful inputs. The authors acknowledge the excellent technical support provided by Mr. Narayanaswami and the other members of the RRI machine shop for the fabrication of this experiment. Ms. S. Sujatha, RAL, RRI is acknowledged for crucial electronics fabrication.
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