Three recent articles (1, 2, 3) describe methods of heat control which seem unnecessarily complicated in view of the present technical development of control tubes in the radio industry. Those methods, just mentioned, use mechanical relays and have wiring schemes which, although not complicated to those acquainted with radio, are nevertheless too difficult for many people to construct. One of t...

As design studies and various R&D efforts continue on Next Linear Collider (NLC) systems, much R&D work is being done on X-Band klystron development, and development of pulse modulators to drive these X-Band klystrons. A workshop on this subject was held at SLAC in June of 1998, and a follow-up workshop is scheduled at SLAC June 23-25, 1999. At the 1998 workshop, several avenues of R&D were pro...

A. Abstract In 1995, an improvement project was completed on the 244 klystron modulators in the linear accelerator. The modulator system has been previously described [ 11. This article offers project details and their resulting effect on modulator and component reliability. Prior to the project, we had collected four operating cycles (1991 through 1995) of MTTF data [2]. In this discussion, th...

The apparatus described below was used during the past year to provide first-year medical and graduate students with an opportunity to observe and study for themselves basic phenomena characteristic of the excitable tissues in general and nerve in particular. The apparatus represents the culmination of numerous attempts on our part to design and develop an arrangement that would be relatively s...

In neurophysiological investigation there is often need for a device which can precisely control the duration and repetition rate of a volley of electrical stimuli delivered to the tissue under observation. An electronic circuit (Fig. 1 ) was designed and built to meet that need. The circuit has three main components-the gating, univibrator, and pacemaker tubes. The gating tube (6SN7) is a cath...

The main aim of this investigation is to assess the suitability of modern power semiconductor devices for pulse power applications. Pulse power system involves the storage of energy, which is released in form of high power pulse to the load by means of a switching device. Hence the basic components of pulse power system are an energy storage element, a switch, and a load circuit. The energy sto...

Dowex 50. The resin, kindly supplied by Dow Chemical International Ltd., Midland, Michigan, U.S.A., was stated to be of nominal 12% cross-linking and 200-400 mesh. Sodium phosphate buffer pH 6-8, 0.1M. This buffer was adjusted to pH 6-75 in order to delay slightly the emergence of the histidine peak. At the lower pH, histidine emerges separated from and almost mid-way between hydroxylysine and ...

A bsnact A discussion of the operation and reliability of the 244 modulators in the SLAC linac with an emphasis on the past three years of operation. The linac modulators-were desi ned and built in the 60's, upgraded f for the SLAC Linear Collider (S C) in the mid 8Os, and despite their age are still reliable accelerator components. The 60s modulator qpcrated at 65 MW peak and 83 kW average pow...

A Pulsed Power System is characterized by its energy storage system, the energy can be released in the form of a high power pulse to the load, by means of a switching device. The energy storage is usually either of an inductive or a capacitive nature. The limiting device in a Pulsed Power System is often the switch, which limits the pulse peak power and the repetition rate. The conventional app...