Abstract
Neutron interferometry at the National Institute of Standards and Technology is a well-established program that performs experiments in a wide range of areas including materials science, quantum information, precision measurements of coherent and incoherent scattering lengths, and dark energy/fifth force searches. Central to the continued success of this program is the further understanding and elimination of instabilities and coherence-losses whether they are from thermal, vibrational, or dynamical sources. We have spent considerable effort in fabricating new interferometer crystals which have higher maximum fringe visibilities and that can be tailored to specific experiments. We describe the current facilities and a new post-machining fabrication process of crystal annealing.
Highlights
Perfect-crystal silicon interferometers remain the workhorse of the field
We will mention the improvements to stability and noise suppression at the two neutron interferometer facilities at NIST
We have successfully demonstrated that annealing interferometer crystals has a positive effect on the interferometer’s performance and is the first nonchemical method to do so
Summary
Perfect-crystal silicon interferometers remain the workhorse of the field. In this proceeding, we discuss recent advances in the fabrication and post-fabrication of silicon interferometers.
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