Thermal stabilization of neutron Larmor diffractometers

International Conference on Polarised Neutrons for Condensed Matter Investigations

Keller, T.^1,2 ; Tralmer, F.^1,2

Max Planck Institute for Solid State Research, Stuttgart

D-70569, Germany^1

Max Planck Society Outstation at the FRM II, Garching

D-85748, Germany^2

关键词: Accuracy level;    Low thermal expansion;    Radio frequency coils;    RF coil;    Support structures;    Thermal stabilization;    Zerodur;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/862/1/012012/pdf
DOI  :  10.1088/1742-6596/862/1/012012

来源: IOP

【 摘 要 】

We report on the design of a support unit for the radio frequency (RF) coils of a Larmor diffractometer (LD) eliminating fluctuations of the Larmor phase resulting from thermal expansion of the support structures. The key component defining the spacing between the RF coils is a Zerodur bar with a very low thermal expansion coefficient (α = 7 × 10-8K-1). This support unit will allow for LD measurements on the 10-6accuracy level even if the ambient temperature is fluctuating.