Roland F Koontz

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The design for the Next Linear Collider (NLC) at SLAC is based on two 11.4 GHz linacs operating at an unloaded acceleration gradient of 50 MV/m increasing to 85 MV/m as the energy is increased from 1/2 TeV to 1 TeV in the center of mass[1]. During the past several years there has been tremendous progress on the development of 11.4 GHz (X-band) RF systems.(More)
When crops are grown intensively, insect pests frequently become a serious problem. Over 100 insect species are reported to be injurious to potatoes, (Dudley, Landis and Shands 6). Some of these insects have been introduced from foreign countries; others are native pests which have adapted to new host plants. A classic illustration of a potato insect that(More)
The next linear collider will require 200 MW of RF power per meter of linac structure at relatively high frequency to produce an acc.elerating gradient of about 100 MV/m. The higher frequencies result in a higher breakdown threshold in the accelerating structure hence permit. higher a.ccelerating gradients per meter of linac. The lower frequencies have 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)
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)
The design for the Next Linear Collider (NLC) at SLAC is based on two 11.4 GHz linacs operating at an unloaded acceleration gradient of 50 MV/m increasing to 85 MV/m as the energy is increased from 1/2 TeV to 1 TeV in the center of mass[1]. During the past several years there has been tremendous progress on the development of 11.4 GHz (X-band) RF systems.(More)
G. A. THE SLC ENERGY UPGRADE PROGRAM AT SLAC’ LOEW, M. A. ALLEN, R. L. CASSEL, N. R. DEAN, G. T. KONRAD, R. F. KOONTZ AND J. V. LEBACQZ _ Stanford Linear Accelerator Center Stanford Univekty, Stanford, California ~305 Introduction The SLAC Linear Collider (SIX.?) must reach a nominal center-of-maas energy of 100 GeV to fulfill its high energy physics(More)
of the present SLAC injector including the latest beam chopping equipment. Two off-axis guns can each be grid-modulated with trains of pulses as short as 5 nanoseconds. An initial 39.667 MHz beam deflector has sufficient deflecting field to reject adjacent electron bunches of the 2856 MHz prebunched beam, thereby loading one RF bucket of the accelerator(More)
Radiation from high-pressure sodium (HPS) lamps provided more than a 50% increased yield (fresh and dry weight of tops) of loose-leaf lettuce cultivars Grand Rapids Forcing and RubyConn, compared to that obtained by radiation from cool-white fluorescent (CWF) lamps at equal photosynthetic photon flux; yet, input wattage was approximately 36% less. It was(More)