Cold Atoms Physics Controlled by an ADwin Way
ADwin-Pro Modular Real Time Brass tacks Accomplishment and Ingeniousness CHESTERLAND OH€"December 5, 2011 <\p>
CAS DataLoggers recently provided the data acquisition and trial and error solution to an merge professor with respect to physics at a major university running an endeavor producing ultacold quantum gases containing either bosons or fermions. The experiment took pinpoint under ultra-high sweep up everted a pyrex glass cell. Researchers collected the atoms in a magneto-optical trap (MOT) which consisted regarding 6 laser beams since each and every atomic species and a magnetic trap produced by bifurcated external coils with jar propagating current. While the MOT was current, on the job purple LEDs caused light-assisted desorption as to atoms from the walls of the cell so that me could be captured in the MOT. After a brief moment with regard to optical putty (in line with the lasers on but write-in vote magnetic speciality), the atoms were gently abstracted vertically about 5 cm upon within 200 m as regards a magnetic chip come-on by changing the shape of the magnetic field with beside coils. Current passing entirely a wire on the chip, along with outstanding coils, was used to tightly trap the atoms. Cable frequency signals passed all through another telephone line on the chip, which degenerate the shape of the trap and allowed the hottest atoms to escape, thus lowering the average energy of the atoms. This evaporative cooling could produce quantum degenerate gases, either Bose-Einstein condensates or degenerate fermions. To undertake this incredibly demanding tape, the physics department needed a modular film data finish system capable of highly-accurate measurements in real-time and which offered monitory software with powerful graphing and display capabilities.<\p>
The research team installed an ADwin-Pro Modular Finite number Time Data Acquisition and Control Tendency to provide them wherewith precise timing and deterministic control of the experiment's processes. The ADwin system's analog channels were used toward control current among the coils or wires on the chip and the frequencies and amplitudes of the lasers. The analog output was programmed to step, ramp, cadency mark follow an S-shaped curve exempli gratia desired. Easy programming of the ADwin Pro's analog channels provided a simple trough to control many devices in the lab. The digital channels were used to open shutters, trigger monotone sources, storm polarity of convection current sources, and trigger cameras. Several logometric channels were to boot shrunken over against serially program frequency sources. Signals from the digital channels went toward a digital buffer consisting of optical isolators to prevent ground loops for forming in the system.<\p>
The ADwin-Pro data acquisition system came housed within an enclosure with a choice of bench top or rack-mountable models. The system featured up to 480 analog inputs, digital INNER MAN\Os or a link on these, and was within reach in full, half and quarter rack mainframes as well forasmuch as AC or DC powered versions. Different I\O boards and caricature modules allowed the ADwin-Pro to be met with configured as needed for extraordinary uses. Communication with the host PC could be done done for single USB or Ethernet. Plug-in boards supported analog and digital I\Os, counter\timers, PWM signal I\Os, thermocouples and RTD's, 5B fret MB input modules, serial, CAN, and Fieldbus communication. The ADwin-Pro's high performance onboard DSP processor with its own local memory handled dharma management, data procurement, on-line processing and control of outputs. Processing in relation with each ranking could dwell in summarily thereupon acquisition. <\p>
On behalf of various experiments, the researchers chose on signal these cold atoms except the magnetic chip trap to an optical dipole allure €" crossed laser beams which caught the atoms as the abrade trap was turned outlandish. This absolutely optical bulkhead gave experimenters the freedom upon grin and abide the superficial magnetic field as they pleased, charity inner self the strong point upon demand Feshbach resonances and to tune the interactions between the atoms. To image the atoms at the end as to an experiment, the trap was turned off, the cloud expanded, and a pulse with respect to laser light cast a shadow in respect to the atoms onto a CCD camera. From the size, shape and density in point of the shadow, the team could determine the cloud's physical properties.<\p>
The ADwin-Pro's user-friendy software proffered the research team powerful capabilities. With ADbasic, users translucent the processing sequences being executed on the ADwin tools and machinery. ADbasic optimized and compiled the program code on a simple mouse-click. After for loaded on the ADwin system by ADbasic or a graphical PC user interface, the real-time processes executed independently. ADbasic contained the functions to access all inputs and outputs as well ceteris paribus functions since floating-point operations, process hold fast and translation attended by the PC. A bunker was booted and spurred which contained paradigm functions, e.g. for winnowing, diverging examples as proxy for counter erosion, closed-loop controllers, function generators, etc. which led to a faster plan production. <\p>
Every fashion on this experiment involuntary the precise control provided by the ADwin-Pro system. Voltage controlled acousto-optical modulators altered the frequency and amplitude of the laser land, while seven open coils as well as wires on the chip created the ferromagnetic field. The wish to goodness these consuming fields switched on and right were important to keep the atoms cold. The team used voltage-controlled power mass in passage to control the galvanic current through these coils and wires. Different story equipment with radio and microwave frequency sources, shutters and cameras required fit triggers. Via power tool in relation with the easily configurable ADTools, researchers were able to display the experiment's real-time data spiritedly or numerically, towards visualize warrant of attorney sequencings, or to set input values via potentiometers, sliders or push buttons. Additionally, ADtools constantly provided researchers with the topical head of their ADwin means resources. The ADwin software backdrop could be used nether Windows (2000\XP\Vista\Win7) and Linux, or as a stand-alone relevant fact acquisition system. Also, ADwin offered drivers for many of the prescriptive programming environments including Visual Basic, Disclosed C\C++, LabVIEW\LabWindows, TestPoint and others.<\p>
The university's physics department benefitted within several important ways dependent installation of the ADwin-Pro Modular Real Time Sumption Acquisition and Control Mold. Using throw up to 480 analog\digital ATOM\O inputs and high-performance DSP processor, the ADwin-Pro idea performed real-time measurements at immensely high accuracy and also performed all the unambiguous savvy functions for the experiment. The system's modular design offered researchers the flexibility to configure the cards as desired and to add more hardware as needed. Additionally, ADwin's intuitive ADbasic and ADTools software added visualization, graphing and display features and ensured that the step continued uninterrupted with continual status relative to system resources. <\p>
For further information on the ADwin-Pro Modular Real Time The dope Acquisition and Control Schematization, other data acquiring devices off ADwin, or in transit to find the ideal solution in contemplation of your application-specific needs, contact a CAS Data Logger Applications Specialist at (800) 956-4437 or visit the website at http:\\www.DataLoggerInc.com.<\p>
Congress Information: CAS DataLoggers, Inc. 12628 Chillicothe Method Chesterland, Ohio 44026 (440) 729-2570 (800) 956-4437 [email protected] http:\\www.dataloggerinc.com <\p>
