NRL Materials Testing Facility

Meger, R. A.; Huhman, B. M.; Neri, J. M.; Brintlinger, Todd; Jones, H.N.; Cairns, Richard L.; Douglass, S.R.; Lockner, T.R.; Sprague, J.A.

doi:10.1109/tps.2013.2250313

Cited by 9 publications

(2 citation statements)

References 7 publications

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“…For a long time, NJUST has been committed to the research of PPS, The PPS based on the circuit topology above has successfully proved its performance in the previous EM launch experiments [4][5][6][7][8][9][10]. Differing from the past, however.…”

Section: Figure 1 Circuit Topology Of Pfumentioning

confidence: 99%

Design and test of a compact capacitor-based energy storage pulsed power module with high repetitive discharge frequency

Wang

Liu

Feng

et al. 2023

J. Phys.: Conf. Ser.

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Advance in electromagnetic launch have put forward higher requirements for the pulsed power supply(PPS). A capacitive PPS for electromagnetic launcher has been constructed in NJUST recently with a basic cell of 220kJ energy storage, which has a good scalability. Design of integrated 220kJ pulsed power unit (PFU) was demonstrated in the paper. To meet the requirement of compact structure of PPS, the device design and system layout are considered and combined with simulation to optimize the magnetic field distribution in the constrained space. In order to achieve the function of continuous discharge, the reliability of thermal management system, control system and safety protection system are focused on. System description was presented in the paper. A series of experiments were conducted to verify the performance of the module. The results show that the PFU shows good reliability in 10 consecutive burst-shot tests. Due to the modular setup of this pulse formation network, it can be extended to a larger-scale pulse forming network. Flexible current pulse shapes can be formed by controlling the charging voltage and the trigger time of the PFU.

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Section: Figure 1 Circuit Topology Of Pfumentioning

confidence: 99%

Design and test of a compact capacitor-based energy storage pulsed power module with high repetitive discharge frequency

Wang

Liu

Feng

et al. 2023

J. Phys.: Conf. Ser.

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“…The MTF [1] is a 6.1 m long (240") rail gun that is designed to test various rail and armature materials under high stress launch conditions. To facilitate testing of these materials the MTF uses six 1 m (40") solid containments that can be removed and replaced relatively easily.…”

Section: Mtf Descriptionmentioning

confidence: 99%

Diagnostics for kinematics on MTF at NRL

Douglass

Meger

Neri

et al. 2014

2014 17th International Symposium on Electromagnetic Launch Technology

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The Material Test Facility (MTF) houses a medium caliber EM railgun that is designed for ease of access. As such it is ideal for developing diagnostics for measuring the performance of EM launchers. Multiple, in-situ diagnostics have been fielded on the MTF railgun including field sensors for position location and thermal sensors. Kinematics of the launch package are of particular interest. B-dot loops are the usual method but many such B-dots are required to obtain a detailed evolution of position and velocity. This requires many channels and consumes data acquisition resources. NRL has developed several versions of a Flux Ladder diagnostic which include many pick up loops on one data channel. Some versions have multiple flux ladders interleaved to maintain pulse separation in a single channel but increase overall spatial resolution. On MTF 58 positions were monitored in just three channels.Careful processing has yielded velocity and even acceleration. NRL is also developing a Flux Loop diagnostic that has the potential for continuous kinematics with the time resolution of the digital sampling rate. However, Flux Loops are more sensitive to spurious signal sources. Preliminary results are presented.

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Electromagnetic launch experiments using a 4.8 MJ pulsed power supply

Yang

Kim

Lee

et al. 2014

2014 17th International Symposium on Electromagnetic Launch Technology

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After preliminary tests using a small 25 mm-caliber electromagnetic launcher, a larger mid-caliber launcher has been designed and fabricated. The launcher has a rectangular bore of 40 mm x 50 mm where the rails are separated by 50 mm each other and are 5.6 m long. To deliver an electrical current to the launcher, a new 4.8 MJ pulsed power supply (PPS) consisting of eight 600 kJ segments has been constructed. The 600 kJ segment is a basic building block of PPS operated independently. It contains a controller, a charger, a safety circuit, and six 100 kJ unit modules. Each unit module in the segment is composed of a 100 kJ capacitor bank, a thyristor switch, a crowbar diode, and a pulse-forming inductor. The modules in a segment are charged to the same voltage, but they are designed to have different triggering times to make a flexible shape of current waveform. Electrical parameters of the PPS were determined through the discharges of the unit modules, and those of the rails were done by launch experiments or short circuit tests at the ends of the rails. Launch experiments have been done using several current waveforms. The current of 1 MA in a few ms made the armatures of several hundred grams in mass accelerate to velocities near 2 km/s. In this paper, the design and basic performance of the constructed PPS and the electromagnetic launcher are presented.

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NRL Materials Testing Facility

Cited by 9 publications

References 7 publications

Design and test of a compact capacitor-based energy storage pulsed power module with high repetitive discharge frequency

Design and test of a compact capacitor-based energy storage pulsed power module with high repetitive discharge frequency

Diagnostics for kinematics on MTF at NRL

Electromagnetic launch experiments using a 4.8 MJ pulsed power supply

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