Simulations of a convergent bender as neutron polariser for NSE spectrometers

• Published in: Physica. B, Condensed matter Vol. 335; no. 1; pp. 270 - 273
• Main Authors: Manoshin, S, Zsigmond, G, Lieutenant, K, Mezei, F
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.07.2003; Elsevier
• Subjects: Convergent bender; Exact sciences and technology; Experimental methods and instrumentation for elementary-particle and nuclear physics; MC simulation; Neutron spectroscopy; Nuclear physics; Physics; Spectrometers and spectroscopic techniques; Convergent bender; MC simulation; Neutron polarization; Neutron spectroscopy; Digital simulation
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/S0921-4526(03)00254-0

Soller-type collimators with supermirror coating may be used for polarisation of neutron beams. The disadvantage of such devices is a high level of gamma background and fast neutrons in the case of pulsed neutron sources. In order to increase the neutron flux, the collimator was made convergent. Generally, benders make it possible to suppress the fast neutron and gamma background completely. The combination of a bender and a convergent Soller collimator (convergent or focusing bender) is proposed for polarisation of the neutron beam for future NSE spectrometers at the cold source of ESS. Simulations and optimisation of convergent benders as neutron polarisers for NSE spectrometers are presented. The VITESS software package proved to be a powerful tool for the optimisation of polarising devices.