BerILL The ultimate humidity chamber for neutron scattering

Abstract

We present the design and the performances of a precision humidity chamber for neutron diffraction which is the result of a very fruitful collaboration between the Helmholtz Zentrum Berlin and the Institut Laue Langevin. The sample temperature can be set between 10 and 85 C. The relative humidity is controlled from 10 to 99.9 0.01 by controlling the temperatures of the sample and a water bath at the millidegree Celsius scale. Sample exchanges are extremely easy and the operation only requires entering two parameters sample temperature and relative humidity. The performances are confirmed by neutron diffraction measurements performed on DMPC and DOP