H A Deruyter

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BACKGROUND Left ventricular dysfunction after myocardial infarction is associated with an increased risk of death. Other studies have suggested that a potassium-channel blocker might reduce this risk with minimal adverse effects. We investigated whether d-sotalol, a pure potassium-channel blocker with no clinically significant beta-blocking activity, could(More)
This paper reports continuing work on high-gradient ac--celerator structures for future TeV linear colliders. A prerequisite of these structures is that they heavily damp wakefield modes which can be induced by e* bunch trains. Disk-loaded waveguide structures under investigation have radial slots in the disks and/or radial rectangular waveguides in the(More)
An experimental station for an X-band Next Linear Collider has been constructed at SLAC. This station consists of a klystron and modulator, a low-loss waveguide system for rf power distribution, a SLED II pulse-compression and peak-power multiplication system, acceleration sections and beam-line components (gun, pre-buncher, pre-accelerator, focussing(More)
In order to obtain high luminosity and energy efficiency in future linear colliders, it is desirable to accelerate a train of closely spaced bunches on each rf pulse of the machine. There can be severe multibunch beam break-up in such a collider unless some means of strongly suppressing the transverse wakefield is incorporated into the design of the(More)
The MINAC series portable linear electron accelerator systems designed and manufactured at American Science and Engineering, Inc. High Energy Systems Division (AS&E HESD) are discussed in this paper. Each system can be configured as either an X-ray or electron beam source. The 4 MeV and 6 MeV linacs powered by a 1,5 MW magnetron permit operation in a(More)
Three light-weight, x-band, electron accelerators have been developed to provide a series of highly portable sources of x-rays and neutrons for nondestructive testing. The 1.5 MeV x-ray unit has a 200 kW magnetron for an RF source and an air-cooled, traveling wave accelerating structure to minimize Its weight. The 4 and 6 MeV units share the same drive(More)
This paper is a progress report on studies carried out at SLAC to assess the high-gradient behavior of 11.4 GHz copper accelerator structures for future linear colliders. The structures which have been examined in the last year are a 7-cavity standing wave (SW) section and a 30-cavity traveling-wave (TW) section. Both st&tures are of the constant-impedance(More)
Relativistic klystrons are being developed as a power source for high gradient accelerator applications which include large linear electron-positron colliders, compact accelerators, and FEL sources. We have attained 200MW peak power ‘at 11.4 GHz from a relativistic klystron, and 140MV/m longitudinal gradient in a short 11.4 GHz accelerator section. We(More)
We are investigating the RF properties of thin films of materials which are known to have low secondary emission coefficients, such as NbC, NbN and TiN. Preliminary measurements on the latter material have been performed by depositing a 15 nm film on parts of a doubly re-entrant Nb cavity designed to favor electron multipacting which, in the uncoated(More)