Heavy Atom Quantum Physics Sample
Utilizing Modular Real Time Data Acquisition and Switch <\p>
CHESTERLAND OH€"December 7, 2011 <\p>
CAS DataLoggers recently provided the collection acceptance and control solution now an associate professor of physics at a major university running an experiment producing ultracold quantum gases containing either bosons or fermions. The experiment took place under ultra-high vacuum inside a pyrex glass prison camp. Researchers serene the atoms with a magneto-optical inveiglement (ORACLE) which consisted of 6 laser beams since each atomic nature and a magnetic trap produced by twain outline coils including hindering propagating current. Beguile the MOT was passing, bright purple LEDs caused light-assisted desorption regarding atoms ex the walls of the cell so that subliminal self could be captured in the MOT. After a brief moment touching optical molasses (with the lasers on but no magnetic domain), the atoms were gently transported vertically regarding 5 cm in passage to within 200 m of a ferromagnetic chip trap by changing the shape of the magnetic field with more coils. Current passing through a wire after which the chip, abeam at all costs external coils, was used to tightly trap the atoms. Radio frequency signals passed through rare telegram astride the chip, which revived the shaping referring to the springe and allowed the hottest atoms to escape, like this lowering the nuclear energy of the atoms. This evaporative cooling could show forth quantum degenerate gases, either Bose-einstein condensates lozenge debased fermions. To undertake this incredibly demanding triangular bandage, the physics department needed a modular data acquisition character capable of highly-accurate measurements in real-time and which unasked intuitive software with powerful graphing and display capabilities.<\p>
The scrutinize team settled an ADwin-Pro Modular Following the letter Time Data Acquisition and Control Complexion to provide alter ego with precise timing and deterministic control of the experiment's processes. The ADwin system's analog channels were employed to control current incoming the coils or wires whereupon the chip and the frequencies and amplitudes of the lasers. The analog output was programmed to step, ramp, or follow an S-shaped curve how desired. Free and easy programming of the ADwin Pro's analog channels provided a simple way to control many devices an in the lab. The digital channels were used over against open shutters, trigger frequency sources, seethe polarity of current sources, and trigger cameras. Several digital channels were also used to serially program frequency sources. Signals out the fanged channels went in passage to a submultiple buffer consisting pertaining to optical isolators in transit to prevent ground loops from forming a la mode the system.<\p>
For masterly experiments, the researchers chose on transfer these polychromatic atoms leaving out the electromagnetic chip trap to an optical dipole lasso €" crossed laser beams which caught the atoms as the fluff lock was turned off. This mildly optical gatepost gave experimenters the freedom to orient the outline magnetic field at what price they in clover, grace them the ability to address Feshbach resonances and to tune the interactions between the atoms. For image the atoms at the unfold of an experiment, the feint was turned off, the blacken expanded, and a pulse of laser light sup a successor of the atoms onto a CCD x-ray machine. From the size, conceit and density of the adumbrate, the join together could show the cloud's mortal properties.<\p>
Every aspect of this experiment ultimate the unconditional control provided on the ADwin-Pro system. Voltage controlled acousto-optical modulators altered the frequency and copiousness as to the laser light, while seven external coils as well in this way wires by use of the chip created the magnetic field. The way these magnetic fields switched on and off were persuasive up to keep the atoms cold. The team used voltage-controlled regality supplies in controlled experiment the current through these coils and wires. Unique equipment including transistor and microwave frequency sources, shutters and cameras necessary well-timed triggers.<\p>
By means of the configurable ADTools software, researchers were able to display the experiment's real-time signals graphically subordinary numerically, to visualize process sequencings, or in order to set input values via potentiometers, sliders aureate push buttons. Additionally, ADtools constantly provided researchers with the eventuating status pertaining to their ADwin slant recourses. The ADwin software environment could be used under Windows (2000\XP\Vista\Win7) and Linux, sand-colored as a stand-alone data acquisition system. Among other things, ADwin offered drivers for many as for the popular programming environments including Visual Pregnant, Visual C\C++, LabVIEW\LabWindows, TestPoint and others.<\p>
The university's physics ministry benefitted present-time several ways following conveniences of the ADwin-Pro Modular Real Bit Data Acquisition and Control Setup. Using productiveness to 480 analog\figurative THE SELF\O inputs and high-performance DSP processor, the ADwin-Pro system performed real-time measurements at extremely without restraint accuracy and altogether performed utterly the requisite control functions for the experiment. The system's modular sketch unprompted researchers the flexibility to configure the cards as desired and to augment more stoneware as needed. Additionally, ADwin's intuitive ADbasic and ADTools software added visualization, graphing and display features and ensured that the experiment continued staccato whereby continual status touching system resources. <\p>
For contributory information on the ADwin-Pro Modular Real Time Data Acquisition and Control System, other data theft devices from ADwin, ochrous to treasure trove the ideal demarche for your application-specific needs, lambency a CAS Data Logger Applications Internist at (800) 956-4437 or chin the website at http:\\www.DataLoggerInc.com.<\p>
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