Microwave cavity resonance spectroscopy of ultracold plasmas

Abstract

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Photoionization-cross-section measurement of the Rb85 5 P3/22 excited state usi

“…Finally, the uncertainty in the wavelength of the photoionization laser and the stability of the other parameters in the fit function (16) seem to have a negligible effect on the photoionization cross section when correcting for this. Hence, for future experiments the earlier-mentioned effects should therefore be taken into consideration first when repeating a measurement.…”

“…1. The main part consists of an ultrahigh vacuum (UHV) chamber with a microwave cavity inside (labeled 1) in which a cloud of 85 Rb atoms is laser cooled and trapped using a grating chip MOT, as discussed in previous papers [16,17]. This is done with a 780-nm cooling laser, which drives the 5 2 S 1/2 (F = 3) to 5 2 P3/2(F = 4) cooling transition nonresonantly and which enters the cavity through the hole shown in Fig.…”

“…The shift in the resonance frequency ω of the cavity was measured as a function of time t with the data-acquisition system discussed in previous papers [16,17,19] and is related to the electron density of the ultracold plasma by [20]…”

Collisional microwave heating and wall interaction of an ultracold plasma in a resonant microwave cavity

“…To compare our model with the self-similar expansion model, we performed a simulation in which we track the positions of 3000 particles as a function of time, during the first 100 μs of the plasma decay, in time steps of 100 ns. We created a particle distribution with initial conditions resembling the conditions of the measurement reported in a previous paper [16]; we chose T e (0) = 50 K, N e (0) = 5.2 × 10 6 electrons, r 0 = (0, 0, 3.5) T mm, and, since our model assumes the plasma to have a spherical instead of ellipsoidal shape, we set σ(0) to the geometrical mean of the rms sizes of the plasma created in reference [16], which is 410 μm.…”

“…Recently, we introduced a new type of diagnostic for the study of UCPs that combines some of the advantages provided by previous UCP diagnostic techniques; it allows the plasma to be followed simultaneously in a non-destructive manner, with nanosecond temporal resolution, high sensitivity, and is, as a technique, applicable to UCPs of all atomic species [16,17].…”