1,385 research outputs found
Manufacturing a thin wire electrostatic trap (TWIST) for ultracold polar molecules
We present a detailed description on how to build a Thin WIre electroStatic
Trap (TWIST) for ultracold polar molecules. It is the first design of an
electrostatic trap that can be superimposed directly onto a magneto optical
trap (MOT). We can thus continuously produce ultracold polar molecules via
photoassociation from a two species MOT and instantaneously trap them in the
TWIST without the need for complex transfer schemes. Despite the spatial
overlap of the TWIST and the MOT, the two traps can be operated and optimized
completely independently due to the complementary nature of the utilized
trapping mechanisms.Comment: 5 pages, 8 figures, updated conten
Research Prospectus: Screening for Cervical Cancer
From our proposed study on screening for cervical cancer, we expect to obtain guidelines for improving the design of cervical cancer screening programs. This can be accomplished by achieving four intermediate objectives.
(a) Resolve important uncertainties in our knowledge of the natural history of cervical cancer. (b) Elucidate relations between design factors of a screening program and the composition of the population which volunteers to be screened. (c) Formulate an optimization model using information developed in the first two activities. This model would choose an optimal screening policy given an assumed steady-state population and given various levels of resources. (d) Create a simulation model (or adapt an existing one) to study questions of time-phasing and implementation of the policies developed in the third activity.
The methods we anticipate using and the data we will require for each of the four objectives are discussed
Trapping of ultracold polar molecules with a Thin Wire Electrostatic Trap
We describe the realization of a dc electric-field trap for ultracold polar
molecules, the thin-wire electrostatic trap (TWIST). The thin wires that form
the electrodes of the TWIST allow us to superimpose the trap onto a
magneto-optical trap (MOT). In our experiment, ultracold polar NaCs molecules
in their electronic ground state are created in the MOT via photoassociation,
achieving a continuous accumulation in the TWIST of molecules in low-field
seeking states. Initial measurements show that the TWIST trap lifetime is
limited only by the background pressure in the chamber.Comment: 4 pages, 3 figure
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