Magnetic shielding for the Fermilab Vertical Cavity Test Facility

A superconducting RF cavity has to be shielded from magnetic fields present during cool down below the critical temperature to avoid freezing in the magnetic flux at localized impurities, thereby degrading the cavity intrinsic quality factor Q{sub 0}. The magnetic shielding designed for the Fermilab vertical cavity test facility (VCTF), a facility for CW RF vertical testing of bare ILC 1.3 GHz 9-cell SRF cavities, was recently completed. For the magnetic shielding design, we used two cylindrical layers: a room temperature 'outer' shield of Amumetal (80% Ni alloy), and a 2K 'inner' shield of Cryoperm 10. The magnetic and mechanical design of the magnetic shielding and measurement of the remanent magnetic field inside the shielding are described

Design and commissioning of Fermilab's vertical test stand for ILC SRF cavities.

As part of its ILC program, Fermilab is developing a facility for vertical testing of SRF cavities. It operates at a nominal temperature of 2K, using a cryoplant that can supply LHe in excess of 20g/sec and provide bath pumping capacity of 125W at 2K. The below-grade cryostat consists of a vacuum vessel and LHe vessel, equipped with magnetic shielding to reduce the ambient magnetic field to <10mG. Internal fixed and external movable radiation shielding ensures that exposure to personnel is minimized. The facility features an integrated personnel safety system consisting of RF switches, interlocks, and area radiation monitors

Differences in anti-malarial activity of 4-aminoalcohol quinoline enantiomers and investigation of the presumed underlying mechanism of action

International audienc

Optimization Studies for Radiation Shielding of a Superconducting RF Cavity Test Facility

Test facilities for high-gradient superconducting RF cavities must be shielded for particle radiation, which is generated by field emitted electrons in the cavities. A major challenge for the shielding design is associated with uncertainty in modeling the field emission. In this work, a semi-empirical method that allows us to predict the intensity of the generated field emission is described. Spatial, angular and energy distributions of the generated radiation are calculated with the FISHPACT code. The Monte Carlo code MARS15 is used for modeling the radiation transport in matter. The detailed distributions of the generated field emission are used for studies with 9-cell 1.3 GHz superconducting RF cavities in the Fermilab Vertical Cavity Test Facility. This approach allows us to minimize the amount of shielding inside cryostat which is an essential operational feature

I Can't Believe It's Not Bakhtin!: Literary Theory, Postmodern Advertising and the Gender Agenda

Taking the literary theories of Mikhail Bakhtin as a starting point, the authors offer three gendered readings of a postmodern advertisement for Moët & Chandon champagne. They commence with a discussion of the influence of gender on textual interpretation; continue with an outline of Bakhtin's key concepts, with particular reference to gender; present three contrasting readings of Moët's postmodern advertisement; and conclude with a discussion of their interpretations together with some reflexive reflections on the gender agenda. Though not claiming to offer a comprehensive introduction to Bakhtin, they do try to exemplify, in a quasi-carnivalesque mode of exposition, something of the character of that supremely gifted thinker and to demonstrate the insights his concepts provide in relation to gendered readings of advertising texts