(a) The Cryomech PT407 cryocooler, with low vibration stage (remote motor and helium reservoirs not shown). Ion traps are anchored to the low-vibration stage, which is thermally linked to the 4 K second stage of the cryocooler. (b) The cryostat (with side panels removed) and superstructure.
Section view of the cryostat including the cold-head, vacuum enclosure, radiation shield, and trap.
Cross-sections showing optical access to the trap. (a) Side view. (b) Bottom view, with typical laser paths indicated.
The trap socket (with trap installed) and fan-out PCB used to couple DC and RF voltages to the trap electrodes.
The two-stage oven. Applying current to the reservoir and reflector projects calcium flux onto the trap without risking oxide dust or fragments falling to the trap below.
The GTRI “Gen II” surface electrode trap. Reprinted with permission from Related Article(s): S. C. Doret et al. , New J. Phys.14, 073012 (Year: 2012)10.1088/1367-2630/14/7/073012
. Copyright 2012 IOP Publishing.
Thermal performance as a function of RF drive voltage. Trap temperatures are measured on the top ground plane at the periphery of the trap chip; thermal modeling suggests that the RF electrodes are 10-20 K higher in temperature.
Single ion lifetime in the absence of Doppler cooling in a harmonic (ω z = 1 MHz) well with calculated trap depth 32 meV.
Motion of the low-vibration stage. (a) and (b) Cryostat vibration in the plane of the ion trap as measured using a razor blade, with directions matching the trap axes indicated in Fig. 6 . (b) shows the shaded region from (a). High frequency noise is due to detection electronics and motion is negligible along . (c) Ion motion mapped by triggered CCD fluorescence images. Each point is separated in time by 50 ms. The circled cluster of points approximately matches the shaded region in (a). (d) and (e) Fluorescence images of the ion averaged over one cycle of the cryocooler vibration or triggered during the low-motion window, respectively. The “comet tail” extending down and to the right is due to optical aberration rather than vibrations.
Compensation of stray electric fields. (a) Micromotion sidebands may be probed perpendicular to the trap plane using a laser tuned to the S 1/2 → D 5/2 transition at 729 nm. (b) Stray electric fields are compensated when both the first- and second-order sidebands are simultaneously minimized. (c) Measured stray electric fields in three dimensions.
Ion heating. Fitted heating rates are 41(3), 24(3), and 110(3) quanta/sec for the axial, lower radial, and upper radial secular modes, respectively.
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