Constant current pulsed power supply for long pulse arc discharge positive hydrogen ion source.

The simplest way to produce high density hydrogen plasmas is to form an arc between the arcing electrode and the plasma chamber (cathode). For arc-based hydrogen plasma generation, a pulsed power supply that delivers 2 ms-long constant current pulse has been developed. This pulsed power supply employs a high frequency buck converter topology with a nonlinear filter inductor.

A novel method for Lorentz force detuning compensation in multi-cell superconducting RF cavity and its validation at room temperature.

A tuner is an important element of a superconducting radio frequency (SCRF) cavity, which is used to tune the cavity at resonance frequency. The measurement and control of the pulsed detuning phenomenon is very challenging and can be measured in the superconducting state of the cavity at a high voltage gradient. This paper describes an innovative method and unique approach for the measurement of dynamic changes in resonance frequency of the SCRF cavity even at room temperature.

Development of a pulsed radio frequency ignited multicusp-free negative hydrogen ion source.

A multicusp-free external antenna based radio frequency (RF) negative hydrogen (H) ion source was developed to produce 16 mA of H ion current at -50 kVDC accelerating voltage operated with a pulse width of 2 ms at 2 Hz repetition rate. A pulsed RF igniter system is devised for generating the initial electron and ion pairs required to generate the main plasma in the pulsed mode. This pulsed RF igniter reliably starts ignition with a hydrogen gas flow rate in the range of 18-50 standard cubic centimeter per minute (SCCM).

New multiplexed all solid state pulser for high power wide aperture kinetically enhanced copper vapor laser.

A novel multiplexed scheme is demonstrated to combine two or more pulsed solid state pulsers of moderate capabilities. Pulse power supply comprising of two solid state pulsers of ~6 kW rating each in multiplexed mode with common magnetic pulse compression stage was demonstrated and optimized for operating with a wide aperture kinetically enhanced copper vapor laser. Using this new configuration, the multiplexed pulsed power supply was capable of operating efficiently at net repetition-rate of ~13 kHz, 12 kW (wall plug average power), 18-20 kV discharge voltage and pulse rise-time of ~80 ns.