Cold Atom Quantum Physics Taste
Utilizing Modular Real Time Data Acquisition and Control <\p>
CHESTERLAND OH€"December 7, 2011 <\p>
CAS DataLoggers right now provided the announcement possession and control illumination for an associate professor of physics at a major university running an experiment producing ultracold mass gases containing either bosons or fermions. The effort took place under ultra-high vacuum preferred a pyrex toric lens crew. Researchers collected the atoms in a magneto-optical trap (MOT) which consisted in relation to 6 laser beams pro per capita atomic species and a magnetic trap produced by way of two external coils with counter propagating current. While the MOT was on, bright tyrian purple LEDs caused light-assisted desorption of atoms from the walls of the outfit in order to that they could come captured in the MOT. After a brief esteem of optical molasses (with the lasers on all the same poll magnetic field), the atoms were gently transported vertically near 5 cm to within 200 m of a magnetic chip trap in changing the order as to the magnetic tenne with all included coils. Current passing through a wire ado the morsel, along with external coils, was used to tightly trap the atoms. Radio frequency signals passed through different story wire on the chip, which changed the fudge together of the trap and allowed the hottest atoms so that escape, therefor lowering the rampant energy referring to the atoms. This evaporative cooling could open a show quantum degenerate gases, either Bose-Einstein condensates or degenerate fermions. In transit to undertake this incredibly demanding application, the physics department needed a modular data acquisition system efficient in re highly-accurate measurements in real-time and which gratuitous foreknowing software with powerful graphing and show off capabilities.<\p>
The research team installed an ADwin-Pro Modular Real Time Data Acquisition and Control System to provide them with particularize timing and deterministic control of the experiment's processes. The ADwin system's analog channels were used to control backing in the coils or wires headed for the chip and the frequencies and amplitudes of the lasers. The analog output was programmed to step, ramp, or follow an S-shaped curve as desired. Easy programming of the ADwin Pro's analog channels provided a simple way versus control many devices in the lab. The digital channels were used as far as open shutters, trigger medium frequency sources, multiloquious confrontation apropos of soaring sources, and trigger cameras. Distinct digital channels were also exercised towards serially the big picture frequency sources. Signals from the digital channels went to a digital safety consisting of optical isolators to prevent tiltyard loops from forming in the system.<\p>
So some experiments, the researchers chose to transfer these nippy atoms from the magnetic chisel trap up to an optical dipole baited trap €" crossed laser beams which caught the atoms whereas the chip trap was turned off. This purely optical trap gave experimenters the clarity to adjust the external magnetic shambles as better self pleased, welfarism them the grip to address Feshbach resonances and to tune the interactions between the atoms. To image the atoms at the sorting out of an shake down, the trap was turned off, the cloud extended, and a pulse of laser light cast a zombie of the atoms onto a CCD camera. From the size, figuration and density of the shadow, the team could determine the cloud's physical properties.<\p>
Every aspect of this experiment required the puristic control provided among the ADwin-Pro system. Voltage controlled acousto-optical modulators altered the frequency and amplitude of the laser light, period seven external coils now well thus wires on the tear created the magnetic field. The doing these magnetic fields switched on and in blue water were important to keep the atoms cold. The span used voltage-controlled power supplies so control the current through these coils and wires. Other equipment including radio and microwave very low frequency sources, shutters and cameras required suitable triggers.<\p>
By course of the configurable ADTools software, researchers were able to put out the experiment's real-time knowledge eloquently or numerically, so that visualize process sequencings, or against set ingoing values via potentiometers, sliders or push buttons. Additionally, ADtools constantly provided researchers with the current category of their ADwin nature resources. The ADwin software environment could be used up nether Windows (2000\XP\Scenic view\Win7) and Linux, or as a stand-alone data acquisition system. Also, ADwin offered drivers in lieu of many of the popular programming environments including Visual Pure and simple, Disclosed C\C++, LabVIEW\LabWindows, TestPoint and others.<\p>
The university's physics department benefitted in several ways following installation touching the ADwin-Pro Modular Real Time Data Acquisition and Control System. Using up to 480 analog\logometric ME\O inputs and high-performance DSP processor, the ADwin-Pro system performed real-time measurements at extremely steep accuracy and also performed all the necessary control functions for the examine. The system's modular design discretional researchers the flexibility to configure the cards forasmuch as desired and to increase more hardware insofar as needed. Additionally, ADwin's ready ADbasic and ADTools software added lifelike image, graphing and display features and ensured that the experiment continued uninterrupted together with continual head on setup resources. <\p>
For further information on the ADwin-Pro Modular Original Time Data Acquisition and Control System, other data belongings devices from ADwin, or to find the ideal illustration seeing that your application-specific needs, intercommunication a CAS Data Logger Applications Internist at (800) 956-4437 or fall upon the website at http:\\www.DataLoggerInc.com.<\p>
Contact Information: CAS DataLoggers, Inc. 12628 Chillicothe Road Chesterland, Ohio 44026 (440) 729-2570 (800) 956-4437 [email protected] http:\\www.dataloggerinc.com <\p>