Review: <i>Silence at Boalt Hall: The Dismantling of Affirmative Action</i>, by Andrea Guerrero

Graaf, Lawrence B. de

doi:10.2307/25161715

Cited by 1 publication

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“…Three blocks of vacuum-cast polycrystalline beryllium and one block of "pseudo" single-crystal bismuth, each 10 cm in length and 16.5 cm × 6.4 cm in cross section, are used to remove fast neutrons and suppress core gamma-ray (γray) radiation. [12] Vacuum-cast beryllium is known to produce half the beam broadening for a given length of filter at a given wavelength than does the hot-pressed grade of beryllium. [13] This implies fewer neutrons will be lost through the guide walls downstream after they have passed through the filter.…”

Section: A Neutron Source and Straight Guidementioning

confidence: 99%

The high-flux backscattering spectrometer at the NIST Center for Neutron Research

Meyer

Dimeo

Gehring

et al. 2003

Review of Scientific Instruments

281

236

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We describe the design and current performance of the high-flux backscattering spectrometer located at the NIST Center for Neutron Research. The design incorporates several state-of-the-art neutron optical devices to achieve the highest flux on sample possible while maintaining an energy resolution of less than 1 µeV. Foremost among these is a novel phase-space transformation chopper that significantly reduces the mismatch between the beam divergences of the primary and secondary parts of the instrument. This resolves a long-standing problem of backscattering spectrometers, and produces a relative gain in neutron flux of 4.2. A high-speed Doppler-driven monochromator system has been built that is capable of achieving energy transfers of up to ±50 µeV, thereby extending the dynamic range of this type of spectrometer by more than a factor of two over that of other reactor-based backscattering instruments.

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Section: A Neutron Source and Straight Guidementioning

confidence: 99%