A design of a compact and low-cost programmable high-voltage pulser for a linear piezo-stepper motor, using an 8 bit reduce instruction set computers (RISC) microcontroller, a high-voltage complementary metal oxide semiconductor (HVCMOS) converter, and an adjustable three-terminal high-voltage regulator is presented. The design consists of 12 independent digital channels of high-voltage output ...

Two constant current models of Permanent Magnet Brushless Direct Current Motor (PM BLDC) are presented in the paper. In the first part of the paper principle of operation, basic properties and mathematical equations describing PM BLDC models are given. Then, two different constant current models of PM BLDC motor are considered: In the first model, PM BLDC motor is approximated with dc motor; in...

1 Supported by the Nuclear Physics Division of the U. S. Dept. of Energy through the SBIR Program 2 E-mail: [email protected] Abstract Energen, Inc. has developed and demonstrated an SRF cavity tuning mechanism based on magnetic smart materials. Magnetic “smart” materials change their shape in a reversible and repeatable manner when exposed to a small magnetic field. A fine-tuning mechanism w...

Protein structure prediction is a central problem in current biophysics. Understanding the energy landscape roughness would shed light on the physics behind protein folding. The theory for extracting energy landscape roughness from temperature dependent unfolding measurements is reviewed. Improvements facilitating temperature dependent single molecule protein unfolding experiments are described...

Abstract The magnetic structure of the proposed variable period undulator consists cylindrical magnets. Each magnet can be rotated by a small stepper motor, in order to adjust field and form an arbitrarily shaped profile on-axis. Meanwhile, short prototype exists, equipped with scalable control system drive large amount motors. This paper describes details implementation, results tests on diffe...