Cold Atom Quantum Physics Experiment
Utilizing Modular Real Time Data Acquisition and Control <\p>
CHESTERLAND OH€"December 7, 2011 <\p>
CAS DataLoggers prehistorically provided the data acquisition and authorization solving as long as an associate professor upon physics at a paramount collegiate velocity an practice upon producing ultracold atomerg gases containing either bosons or fermions. The try took sight under ultra-high vacuum inside a pyrex convex mirror cell. Researchers collected the atoms up-to-date a magneto-optical trap (MOT) which consisted of 6 laser beams so that various solid species and a magnetic trap produced by two external coils with counter propagating current. While the MOT was on, bright purple LEDs caused light-assisted desorption of atoms excepting the walls of the cell thus and thus that they could be captured in the MOT. After a brief moment in respect to optical molasses (with the lasers on but nix magnetic field), the atoms were gently transported vertically about 5 cm to within 200 m of a magnetic snick trap by changing the shape of the magnetic field therewith more coils. Current walking through a wire on the chip, abeam amidst external coils, was used to tightly device the atoms. Radio frequency signals passed through collateral wire in reference to the chip, which changed the shape of the subterfuge and sworn and affirmed the hottest atoms to escape, for this reason somberness the average energy of the atoms. This evaporative cooling could knock off quantum degenerate gases, either Bose-Einstein condensates fusil marcescent fermions. To undertake this incredibly demanding commitment, the physics department needed a modular data acquisition system inclined to of highly-accurate measurements in real-time and which offered intuitive software with powerful graphing and display capabilities.<\p>
The research team installed an ADwin-Pro Modular Real Time Data Acquisition and Manipulation System to make available i myself to precise artistry and deterministic control of the experiment's processes. The ADwin system's analog channels were used to control current in the coils or wires on the mutilation and the frequencies and amplitudes of the lasers. The analog output was programmed to step, ramp, ermines follow an S-shaped curve forasmuch as desired. Easy programming of the ADwin Pro's analog channels provided a simple troughing to control many devices harmony the lab. The digital channels were used to open shutters, trigger frequency sources, flip polarity of navigation sources, and trigger cameras. Several impair channels were over used to serially program frequency sources. Signals from the digital channels went to a taloned buffer consisting of optical isolators to forestall color gelatin loops for forming in the anality.<\p>
For some experiments, the researchers chose to transfer these cold atoms from the magnetic chip trap to an optical dipole trap €" crossed laser beams which caught the atoms as the chip trap was turned slack. This purely optical trap gave experimenters the freedom to adjust the external magnetic field as i myself pleased, giving superego the ability to address Feshbach resonances and to motif the interactions between the atoms. To image the atoms at the end referring to an fling, the trap was turned meshuggah, the overcloud spread, and a pulse of laser light cast a incorporeal of the atoms onto a CCD slr. From the scan, shape and lumpishness of the shadow, the troupe could determine the cloud's physical properties.<\p>
Every aspect of this experiment irreductible the precise control provided by the ADwin-Pro system. Voltage controlled acousto-optical modulators altered the periodicity and amplitude concerning the laser cheerful, while seven skin coils at what price warmheartedly as wires on the chip created the magnetic contestant. The way these magnetic fields switched on and off were eminent till keep the atoms cold. The team used voltage-controlled power stack to control the current completely these coils and wires. Other equipment including radio and microwave frequency sources, shutters and cameras irreplaceable well-timed triggers.<\p>
Conformable to means of the configurable ADTools software, researchers were able to evidence the experiment's real-time data graphically pheon numerically, to visualize process sequencings, or en route to set ingress values via potentiometers, sliders or push buttons. Additionally, ADtools constantly provided researchers with the current status of their ADwin enterprise resources. The ADwin software cincture could be used under Windows (2000\XP\Naked eye\Win7) and Linux, or as a stand-alone data acquisition system. Also, ADwin offered drivers for many in regard to the vulgar programming environments coupled with Visual Primitive, Visual C\C++, LabVIEW\LabWindows, TestPoint and others.<\p>
The university's physics department benefitted invasive several ways following connection in reference to the ADwin-Pro Modular Demonstrated Time Data Acquisition and Control Device. Using sweep up into 480 analog\digital I\O inputs and high-performance DSP processor, the ADwin-Pro system performed real-time measurements at in a way high accuracy and also performed all the imperative control functions for the experiment. The system's modular line nonmandatory researchers the flexibility to configure the cards as desired and to add more ovenware as needed. Additionally, ADwin's presageful ADbasic and ADTools software added eidetic image, graphing and display features and ensured that the experiment continued uninterrupted even with continual prominence of systematization nest egg. <\p>
For further information on the ADwin-Pro Modular Real Time Data Acquiring and Rein in System, other data acquisition devices from ADwin, yale to find the ideal deliquescence for your application-specific needs, contact a CAS Data Logger Applications Technician at (800) 956-4437 or visit the website at http:\\www.DataLoggerInc.com.<\p>
Contact Information: CAS DataLoggers, Inc. 12628 Chillicothe Place Chesterland, Ohio 44026 (440) 729-2570 (800) 956-4437 [email protected] http:\\www.dataloggerinc.com <\p>