This paper develops a new setup and procedure for obtaining and verifying the real CDM ESD waveform from MR Heads. Data shows that previously reported double peaks are an anomaly of the setup and procedure. The new setup separates (location) the paddle-board from the suspension and uses a thin dielectric to avoid arc-over to the metallic suspension. This will allow for the proper development of a CDM standard for MR Heads.
We have designed an economical device to measure the power time history in the National Ignition Facility's (NIF) 192 beam laser. The heart of the system is a commercial, high-speed, four-channel digitizer with a 15,000 point record length. Samples of several beams are taken with fiberoptic pickoffs, separated in time with appropriate fiberoptic delays and presented to high-speed vacuum photodiodes, which convert the samples to electrical signals for the digitizer. Amplitude and time multiplexing are used to cover the required dynamic range and to record 12 samples on the digitizer, making the cost per sample competitive with alternative approaches. Forty-eight digitizers can record the required three samples from each of the 192 beams. An additional similar but lower bandwidth system is used to record the backreflected light from the main laser amplifiers and elsewhere. The recording electronics are discussed in detail.
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