Three-wall piston-cylinder type pressure cell for muon-spin rotation/relaxation experiments

Abstract

A three-wall piston-cylinder type high pressure cell for muon-spin rotation/relaxation experiments was designed, manufactured, tested and commissioned. The outer cylinder of the cell body is made from MP35N and the middle and the inner cylinders are made from NiCrAl nonmagnetic alloys. The mechanical design and performance of the pressure cell are evaluated and optimised using finite-element analysis. The outcomes of the experimental testing closely match the modelling results. The high-pressure cell is shown to reach pressures of up to 3.3 GPa at ambient temperature, corresponding to 3.0 GPa at low temperatures, without irreversible damage.

Optical setup for a piston-cylinder type pressure cell: a double-volume approach

“…2 (a). The pressure cell body (with the inner and the outer diameters ∅6 and ∅24 mm, respectively) and the top part of the pressure seal [the mushroom, the tungsten carbide (WC) piston, the WC support pad, and the fixing bolt] are the same as currently used in clamped cells for muon-spin rotation/relaxation experiments, 6,7,14 and are not discussed here.…”

“…The pressure seal can lead to a large amount of friction due to the piston sliding past the cell, 5 so the real pressure inside the cell becomes smaller compared to the applied one (p < p ap ) during the cell pressurisation process, and it is higher than p ap (p > p ap ) during the cell depressurisation procedure. 14 The setup of our test experiments is shown schematically in Fig. 6 (a).…”