Heather Hogg

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Over the past few years, several schemes for *. making significant increases in the energy of the SLAC beam have been proposed. Two of the proposals, namely the use of superconducting accelerating sections1 and recirculation 1 of the beam for a second pass through the existing acceler. &or,’ have been abandoned for technical and economic reasons after(More)
A novel series of indole/indazole-aminopyrimidines was designed and synthesized with an aim to achieve optimal potency and selectivity for the c-Jun kinase family or JNKs. Structure guided design was used to optimize the series resulting in a significant potency improvement. The best compound (17) has IC50 of 3 nM for JNK1 and 20 nM for JNK2, with greater(More)
The first observation of beam break-up at SLAC was made on April 27, 1966, one week after the beam was first turned on over two-thirds of the accelerator’s two-mile length. I The event caused more astonishment than panic because the observed beam break-up current threshold of 10 to 20 mA peak, while much lower than in other shorter accelerators, was not far(More)
The purpose of this paper is to describe recent developments at SLAC which have contributed to improvements in beam operation. The paper will be divided into two parts. The first will summarize overall beam performance and operational efficiency in delivering beams to various experiments. The second will be devoted to specific developments such as the(More)
Introduction The purpose of this paper is to review the progress that has been made in the last six months in understanding and remedying the beam break-up effect (BBU) at SLAC. No attempt will be made to give a comprehensive summary of earlier work on this subject published elsewhere. 1,2,3,4 As described in these references , the BBU effect observed and(More)
Measurements at 8.6 GHz on TM mode superconducting niobium cavities have been carried out at SLAC in an attempt to establish definitive conditions for reproducibly attaining high peak electric and magnetic fields and high residual &Is. Four cavities, processed by techniques which insure thepresence of an oxi& layer on the niobium surface before final high(More)
The automatic phasing system for the Stanford two-mile linear electron accelerator is designed to be capable of adjusting the phases of 240 high power klystrons so that they each contribute maximum energy to the bunched electron beam being accelerated. The two-mile linear accelerator is at present being built by Stanford University, under contract with the(More)
  • 1969
A materials research program is described. The program objectives are to evaluate materials and develop processing and fabrication techniques which it will be economically feasible to use in the construction of a high-gradient (10 MeV/ft) two-mile linear accelerator. RF properties are evaluated by cavity Q measurements at selected frequencies in the range 3(More)