TY - JOUR
T1 - Using Fermi choppers to shape the neutron pulse
AU - Peters, J.
AU - Champion, J. D.M.
AU - Zsigmond, G.
AU - Bordallo, H. N.
AU - Mezei, F.
PY - 2006/2/15
Y1 - 2006/2/15
N2 - This work is part of a series of papers [H.N. Bordallo, G. Zsigmond, J.D.M. Champion, Physica B 350 (2004) e717; J. Peters, Nucl. Instr. and Meth. A 540 (2005) 419] about benchmarking studies related to Fermi choppers (FC) used for pulse shaping of neutron scattering instruments. Here, we discuss the comparison of simulated and analytical results to experimental data of the pulse shape observed immediately after the FC in the High Energy Transfer (HET) instrument at ISIS. From the simulation side, there is a combination of a better moderator description, new absorbing B4C apertures and a new geometrical description of the FC that enhanced the original results [H.N. Bordallo, G. Zsigmond, J.D.M. Champion, Physica B 350 (2004) e717]. Besides, the analytical formalism, recently derived in [J. Peters, Nucl. Instr. and Meth. A 540 (2005) 419], is applied to the FC module of the Monte Carlo (MC) software package VITESS used in versions 2.5 and 2.5.1. The overall agreement is now very good.
AB - This work is part of a series of papers [H.N. Bordallo, G. Zsigmond, J.D.M. Champion, Physica B 350 (2004) e717; J. Peters, Nucl. Instr. and Meth. A 540 (2005) 419] about benchmarking studies related to Fermi choppers (FC) used for pulse shaping of neutron scattering instruments. Here, we discuss the comparison of simulated and analytical results to experimental data of the pulse shape observed immediately after the FC in the High Energy Transfer (HET) instrument at ISIS. From the simulation side, there is a combination of a better moderator description, new absorbing B4C apertures and a new geometrical description of the FC that enhanced the original results [H.N. Bordallo, G. Zsigmond, J.D.M. Champion, Physica B 350 (2004) e717]. Besides, the analytical formalism, recently derived in [J. Peters, Nucl. Instr. and Meth. A 540 (2005) 419], is applied to the FC module of the Monte Carlo (MC) software package VITESS used in versions 2.5 and 2.5.1. The overall agreement is now very good.
KW - Fermi chopper
KW - Monte Carlo simulation packages
KW - Neutron instruments
UR - http://www.scopus.com/inward/record.url?scp=31444453555&partnerID=8YFLogxK
U2 - 10.1016/j.nima.2005.11.111
DO - 10.1016/j.nima.2005.11.111
M3 - Journal article
AN - SCOPUS:31444453555
SN - 0168-9002
VL - 557
SP - 580
EP - 584
JO - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 2
ER -