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McStas: StatisticalChopper

[ Identification | Description | Input parameters | Links ]

The StatisticalChopper Component

Statistical (correlation) Chopper

Identification

  • Site:
  • Author: C. Monzat/E. Farhi/S. Rozenkranz
  • Origin: ILL
  • Date: Nov 10th, 2009

Description

This component is a statistical chopper based on a pseudo random sequence that the user
can specify. Inspired from DiskChopper, it should be used with SatisticalChopper_Monitor component.

Example: StatisticalChopper(nu=1487*60/255) use default sequence

Input parameters

Parameters in boldface are required; the others are optional.
NameUnitDescriptionDefault
radiusmRadius of the disc0.5
yheightmSlit height (if = 0, equal to radius). Auto centering of beam at half height.0
nuHzFrequency of the Chopper, omega=2*PI*nu
jittersJitter in the time phase0
delaysTime 'delay'.0
isfirst0/1Set it to 1 for the first chopper position in a cw source0
abs_out0/1Absorb neutrons hitting outside of chopper radius?1
phasedegAngular 'delay' (overrides delay)0
verbose1Set to 1 to display Disk chopper configuration0
n_pulse1Number of pulses (Only if isfirst)1
sequencestrSlit sequence around disk, with 0=closed, 1=open positions."NULL"
AT ( , , ) RELATIVE
ROTATED ( , , ) RELATIVE

Links

  • Source code for StatisticalChopper.comp.
  • R. Von Jan and R. Scherm. The statistical chopper for neutron time-of-flight spectroscopy. Nuclear Instruments and Methods, 80 (1970) 69-76.

[ Identification | Description | Input parameters | Links ]

Generated on 2024-01-03 11:47:43


Last Modified: Tuesday, 16-Apr-2024 20:05:21 CEST
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