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HELIA - high energy linear induction accelerators
A novel approach to providing high voltage (>10 MV), high current (>200 kA), short duration (20-40 ns), particle beam pulses is described. The approach uses 1 MV Metglas isolated cavities driven by water pulse lines. These are stacked in series by using a magnetically insulated cathode stalk. Results from modeling of the cavity and cores and from a full sized single-cavity experiment are discussed. Plans for a four-cavity experiment to prove the principle of voltage addition by stacking cavities on a magnetically insulated transmission line are also described. The single-cavity experiments produced a 1.1 MV, 30 ns FWHM, 12 ns rise time, 250 kA electron beam. The HELIA pulsed power system and cavities are described. Particle-in-cell (PIC) computer simulations of the four-cavity experiment and the four-cavity conceptual design are discussed. 13 references, 14 figures
The transatlantic Thames: Anglo-American tensions on the Victorian “stream of pleasure”
While it is widely understood that rivers took on new symbolic power as avatars of nationalism in the late nineteenth century, less examined is their use as a space for Transatlantic cultural flow, and transnational commentary and critique. This article explores the ways in which a variety of Americans abroad in this period centred the Thames – newly charged with nationalist sentiment – in their accounts of Britain. In particular, it analyses Elizabeth Robins and Joseph Pennell’s travel narrative The Stream of Pleasure, first published as the lead article in the ‘Midsummer Holiday Issue’ of The Century Magazine in 1889, as an exemplary text in which both artist and writer play with the image of the river in ways that chime with much wider Transatlantic debates at this moment
SEEDS Adaptive Optics Imaging of the Asymmetric Transition Disk Oph IRS 48 in Scattered Light
Stars and planetary system
Molecular basis for the differential anti-metabolite action of d-tyrosine in strains 23 and 168 of Bacillus subtilis
50S ribosomal subunit synthesis and translation are equivalent targets for erythromycin inhibition in Staphylococcus aureus
Evernimicin (SCH27899) Inhibits both Translation and 50S Ribosomal Subunit Formation in Staphylococcus aureus
Significance of Altered Carbon Flow in Aromatic Amino Acid Synthesis: an Approach to the Isolation of Regulatory Mutants in Pseudomonas aeruginosa
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