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15 results on '"High voltage amplifier"'

5. Final design and test results of a high voltage amplifier for a gyrotron body power supply.

Author

Tooker, Joseph F. and Huynh, Paul

Subjects
*ELECTRONIC amplifiers design & construction, *ELECTRON cyclotron resonance heating, *HIGH voltages, *TRANSISTORS, *GYROTRONS
Abstract

The design of a high voltage amplifier was being developed that uses series-connected transistors to control the output [Tooker and Huynh, 2013]. Although having many potential applications, this amplifier is designed to meet at a minimum the requirements of a body power supply for depressed collector gyrotrons that are used in electron cyclotron systems on the DIII-D tokamak and other devices worldwide. Therefore, the output voltage needs to be adjustable up to 35 kV DC and be capable of square-wave modulation at frequencies up to 5 kHz. Continuous operating body currents for a gyrotron are on the order of a few tens of milliamps. However, to attain the required speed for modulation with load capacitances as high as 2.5 nF, the ability to both source and sink peak currents as high as 5–10 A is required. The design of a 40 kV, 250 mA high voltage amplifier has now been completed and the amplifier was fabricated. The transistors are configured into modules and the modules are mounted in four card cages within an enclosure that has a size equivalent to a standard electronics rack. The high voltage DC power supply, that provides the input voltage to the amplifier section, and the controls for the amplifier are housed within a separate electronics rack. An 800 kΩ, 2.5 nF dummy load for testing the amplifier was also fabricated, and the amplifier was been tested into this load up to its full output. The description of the recently completed amplifier and the test results will be presented. [ABSTRACT FROM AUTHOR]

Published
2015
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6. Biomedical Circuits and Signal Analysis Systems for Measurement within Microsystems

Subjects
Cryptosporidium parvum, On-chip Monitoring, DEP, Contactless DEP, Microfluidics, Forensic Sciences, Dielectrophoresis, Impedance, Cell Separation, Wideband Amplifier, iDEP, Biomedical Circuit Design, cDEP, Acoustophoresis, Acoustic Trapping, Amplifier, High voltage Amplifier, Piezoelectric, Instrumentation, Insulator-based DEP
Abstract

Microsystems are especially well-suited to the study of biological tissues, cells, microbials, and molecules, due to their capability for enabling microfluidic separation towards selective enrichment, high levels of parallelization, and highly sensitive spatially and temporally resolved measurements. However, current innovations to enhance biomedical measurements are chiefly focused in the sphere of materials chemistry and device design. We seek to advance biomedical measurements within microsystems integrating key technologies from electronics and signal analysis fields. Conventional techniques for cell separation are predominantly based on hydrodynamic methods applied to fluorescence- and magnetic-activated cell sorting. However, these techniques suffer from a lack of specificity, high cell loss, use of labels, and high capital/operating cost. Dielectrophoresis (DEP) over an insulator layer (iDEP) or contact-less DEP (cDEP) offers unique advantages for the sorting and analysis of biosystems due to its label-free ability for selective transport based on inherent dielectric properties, which can advance usability, throughput, and efficiency of cell separations. One of the main bottlenecks in iDEP-based cell separation is the physical separation of the electrodes from the sample for reducing the destruction of cells, leads to the need for a higher voltage AC signal (>100 V_RMS) at MHz level. Furthermore, the microfluidic device geometry and architecture of the sample and electrode channels need to be optimized to maximize the fraction of the applied voltage available for DEP manipulation. Despite the technological capabilities of forensic laboratories, the backlog in samples await DNA analysis has become a severe problem. This ever-growing backlog will not be reduced without new techniques that provide automation and enhanced throughput. This dissertation is focused on the design and implementation of electronic circuits and signal analysis systems to address the current limitations in a variety of micro- or bioanalytical systems. Innovations presented here include designing a wideband high voltage AC generator that addresses the performance degradation of commercial amplifiers, an impedance analyzer for optimization of frequency-selective electrokinetic manipulation in microfluidic systems, and a compact and more efficient circuit for real-time tracking of resonance frequency for sample manipulation by acoustophoresis.

Published
2021
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7. The 384-channel prototype of DM Electronics for ELT AO systems

Author

Kris Caputa, Jenny Atwood, P. Spanò, Glen Herriot, Adam Zielinski, and Jean-Pierre Véran

Subjects
Drive electronics, ELT, Computer science, Wavefront corrector, Piezoelectricity, Deformable mirrors, Deformable mirror, Vision aids, Electronics, Piezoelectric actuators, Voltage regulators, Output channels, Wavefront, business.industry, Technological advancement, NFIRAOS, Deformation, Mirrors, Amplifiers (electronic), High voltage amplifier, business, Actuator, Adaptive optics, Actuators, Computer hardware, Communication channel
Abstract

High order AO subsystems of the ELT require technological advancements in the Deformable Mirror (DM) construction and corresponding improvements in the drive electronics. Advanced prototyping is currently under way at NSI-Herzberg to reduce risks of deploying untried technology in the TMT AO subsystem NFIRAOS. We have developed a 96-channel output module and constructed a sub-scale DM Electronics prototype NDME384 with 384 output channels based on 4 such modules. French DM vendor Cilas has fabricated the NFIRAOS DM Breadoboard with 360 piezoelectric actuators in a 60×6 matrix, to demonstrate the DM technology to be deployed in NFIRAOS wavefront correctors. We present the results of testing our NDME384 prototype while driving the NFIRAOS DM Breadoboard., Adaptive Optics Systems IV, June 22-27, 2014, Series: Proceedings of SPIE; no. 9148

Published
2014
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8. Reference design of deformable mirror electronics for ELT systems

Author

Adam Zielinski, Glen Herriot, Kris Caputa, and Joel Niebergal

Subjects
ELT, Computer science, business.industry, Reference design, Deformable mirrors, Electrical engineering, Astrophysics, NFIRAOS, Deformable mirror, High voltage amplifier, Research council, TMT, Electronics, Piezoelectric actuators, Voltage regulators, Laser pulses, Adaptive optics, business, Thirty Meter Telescope, Simulation
Abstract

One of the first ELT AO systems to be deployed will be NFIRAOS of the Thirty Meter Telescope (TMT). NFIRAOS is currently being designed at the National Research Council of Canada's Herzberg Institute of Astrophysics (HIA). NFIRAOS incorporates deformable mirrors with much larger number of actuators than in current AO systems. To aid the procurement of electronics for NFIRAOS DMs, a reference design is under way at the HIA. We have designed the overall architecture, defined a command communication interface and developed a compact and cost-efficient high voltage amplifier suitable for duplicating in 7673 copies for driving the two NFIRAOS DMs., Adaptive Optics Systems III, July 1-6, 2012, Amsterdam, Netherlands

Published
2012
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9. Low Temperature Scanning Tunneling Microscope for Single Atom Manipulation

Author

Babonis, Gregory S.

Subjects
Physics, Condensed Matter, Scanning Tunneling Microscope, Atomic Manipulation, High Voltage Amplifier, LT-STM, Ag[111], Low-Temperature Scanning Tunneling Microscopy
Abstract

In this thesis a low temperature scanning tunneling microscope will be constructed to explore the possibilities of atomic manipulation. In doing so we need to gain an understanding of the quantum mechanical theory of STM operation, set up a complex architecture of specialized equipment to achieve UHV conditions within the STM, control the tip of the microscope through the design and construction of a low noise high voltage amplifier, and record data conclusively demonstrating the ability of the STM to resolve nanoscale surface structures, while more importantly manipulating atoms in a controlled fashion.

Published
2003

10. Ovladač tříosého nanometrického manipulátoru

Author

Drexler, Petr, Jedlička, Petr, Pernica, Lukáš, Drexler, Petr, Jedlička, Petr, and Pernica, Lukáš

Abstract

Tato diplomová práce se zabývá popisem piezoelektrického jevu a jeho využití pro polohování s nanometrovou přesností v laboratorním využití. V práci je popsán přímý a nepřímý piezoelektrický jev, různé druhy piezoelektrických aktuátorů a způsoby jejich ovládání se zaměřením na eliminaci jejich hystereze. Cílem je návrh ovladače pro piezoaktuátory v tříosém nanometrickém manipulátoru Thorlabs MAX341/M., This diploma thesis describes the piezoelectric phenomenon and its use for positioning with nanometric precision in laboratory use. In the thesis is description of direct and indirect piezoelectric phenomenon, various types of piezoelectric actuators and ways of their control with the aim of eliminating their hysteresis. The goal is to design a controller for piezo actuator built in the three-axis nanometric manipulator Thorlabs MAX341/M.

11. Ovladač tříosého nanometrického manipulátoru

Author

Drexler, Petr, Jedlička, Petr, Pernica, Lukáš, Drexler, Petr, Jedlička, Petr, and Pernica, Lukáš

Abstract

Tato diplomová práce se zabývá popisem piezoelektrického jevu a jeho využití pro polohování s nanometrovou přesností v laboratorním využití. V práci je popsán přímý a nepřímý piezoelektrický jev, různé druhy piezoelektrických aktuátorů a způsoby jejich ovládání se zaměřením na eliminaci jejich hystereze. Cílem je návrh ovladače pro piezoaktuátory v tříosém nanometrickém manipulátoru Thorlabs MAX341/M., This diploma thesis describes the piezoelectric phenomenon and its use for positioning with nanometric precision in laboratory use. In the thesis is description of direct and indirect piezoelectric phenomenon, various types of piezoelectric actuators and ways of their control with the aim of eliminating their hysteresis. The goal is to design a controller for piezo actuator built in the three-axis nanometric manipulator Thorlabs MAX341/M.

12. Ovladač tříosého nanometrického manipulátoru

Author

Drexler, Petr, Jedlička, Petr, Drexler, Petr, and Jedlička, Petr

Abstract

Tato diplomová práce se zabývá popisem piezoelektrického jevu a jeho využití pro polohování s nanometrovou přesností v laboratorním využití. V práci je popsán přímý a nepřímý piezoelektrický jev, různé druhy piezoelektrických aktuátorů a způsoby jejich ovládání se zaměřením na eliminaci jejich hystereze. Cílem je návrh ovladače pro piezoaktuátory v tříosém nanometrickém manipulátoru Thorlabs MAX341/M., This diploma thesis describes the piezoelectric phenomenon and its use for positioning with nanometric precision in laboratory use. In the thesis is description of direct and indirect piezoelectric phenomenon, various types of piezoelectric actuators and ways of their control with the aim of eliminating their hysteresis. The goal is to design a controller for piezo actuator built in the three-axis nanometric manipulator Thorlabs MAX341/M.

13. Ovladač tříosého nanometrického manipulátoru

Author

Drexler, Petr, Jedlička, Petr, Drexler, Petr, and Jedlička, Petr

Abstract

Tato diplomová práce se zabývá popisem piezoelektrického jevu a jeho využití pro polohování s nanometrovou přesností v laboratorním využití. V práci je popsán přímý a nepřímý piezoelektrický jev, různé druhy piezoelektrických aktuátorů a způsoby jejich ovládání se zaměřením na eliminaci jejich hystereze. Cílem je návrh ovladače pro piezoaktuátory v tříosém nanometrickém manipulátoru Thorlabs MAX341/M., This diploma thesis describes the piezoelectric phenomenon and its use for positioning with nanometric precision in laboratory use. In the thesis is description of direct and indirect piezoelectric phenomenon, various types of piezoelectric actuators and ways of their control with the aim of eliminating their hysteresis. The goal is to design a controller for piezo actuator built in the three-axis nanometric manipulator Thorlabs MAX341/M.

14. Ovladač tříosého nanometrického manipulátoru

Author

Drexler, Petr, Jedlička, Petr, Drexler, Petr, and Jedlička, Petr

Abstract

Tato diplomová práce se zabývá popisem piezoelektrického jevu a jeho využití pro polohování s nanometrovou přesností v laboratorním využití. V práci je popsán přímý a nepřímý piezoelektrický jev, různé druhy piezoelektrických aktuátorů a způsoby jejich ovládání se zaměřením na eliminaci jejich hystereze. Cílem je návrh ovladače pro piezoaktuátory v tříosém nanometrickém manipulátoru Thorlabs MAX341/M., This diploma thesis describes the piezoelectric phenomenon and its use for positioning with nanometric precision in laboratory use. In the thesis is description of direct and indirect piezoelectric phenomenon, various types of piezoelectric actuators and ways of their control with the aim of eliminating their hysteresis. The goal is to design a controller for piezo actuator built in the three-axis nanometric manipulator Thorlabs MAX341/M.

15. Ovladač tříosého nanometrického manipulátoru

Author

Drexler, Petr, Jedlička, Petr, Pernica, Lukáš, Drexler, Petr, Jedlička, Petr, and Pernica, Lukáš

Abstract

Tato diplomová práce se zabývá popisem piezoelektrického jevu a jeho využití pro polohování s nanometrovou přesností v laboratorním využití. V práci je popsán přímý a nepřímý piezoelektrický jev, různé druhy piezoelektrických aktuátorů a způsoby jejich ovládání se zaměřením na eliminaci jejich hystereze. Cílem je návrh ovladače pro piezoaktuátory v tříosém nanometrickém manipulátoru Thorlabs MAX341/M., This diploma thesis describes the piezoelectric phenomenon and its use for positioning with nanometric precision in laboratory use. In the thesis is description of direct and indirect piezoelectric phenomenon, various types of piezoelectric actuators and ways of their control with the aim of eliminating their hysteresis. The goal is to design a controller for piezo actuator built in the three-axis nanometric manipulator Thorlabs MAX341/M.

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