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Worlds brightest cold neutron spectrometer: MACS Collin Broholm, Johns Hopkins University, DMR 0116585. Neutral and magnetic, neutrons are an ideal probe of materials. Neutron – solid interactions are however weak so intense beams are needed for small samples.

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  1. Worlds brightest cold neutron spectrometer: MACSCollin Broholm, Johns Hopkins University, DMR 0116585 • Neutral and magnetic, neutrons are an ideal probe of materials. Neutron – solid interactions are however weak so intense beams are needed for small samples. • NSF funded MACS now holds the world record for cold monochromatic neutron flux. (b) shows that the flux on sample exceeds current state of the art by more than an order of magnitude. • The central component is the doubly focusing MACS monochromator (see (a)). Built at the Johns Hopkins University with the involvement of graduate and undergraduate students, it comprises 357 orientable graphite platelets that direct neutrons to the sample (a) (b)

  2. Multi-channel energy dispersive neutron detectionCollin Broholm, Johns Hopkins University, DMR 0116585 (c) • Each neutron scattered from the sample carries structural and/or dynamic information. MACS optimizes detection through multiplexing. • The key component is the double crystal analyzer (b-c). It is as effective as a conventional single bounce analyzer yet compact to enable multiplexing. • With 40 times the neutrons and 20 times the detectors, MACS may be 2-3 orders of magnitude more efficient than a conventional triple axis spectrometer. • The increased efficiency will provide access to exotic quasi-particles in small samples plus spin waves and phonons in confined in engineered nano-structures. (a) (b)

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