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McStas: StatisticalChopper Component

[ Identification | Description | Input parameters | Output parameters | Links ]

The StatisticalChopper Component

Statistical (correlation) Chopper

Identification

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

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

WARNING: This is a contributed Component.

Input parameters

Parameters in boldface are required; the others are optional.
Name Unit Description Default
radius m Radius of the disc 0.5
yheight m Slit height (if = 0, equal to radius). Auto centering of beam at half height. 0
nu Hz Frequency of the Chopper, omega=2*PI*nu (algebraic sign defines the direction of rotation)  
jitter s Jitter in the time phase 0
delay s Time 'delay'. 0
isfirst 0/1 Set it to 1 for the first chopper position in a cw source (it then spreads the neutron time distribution) 0
abs_out 0/1 Absorb neutrons hitting outside of chopper radius? 1
phase deg Angular 'delay' (overrides delay) 0
verbose 1 Set to 1 to display Disk chopper configuration 0
n_pulse 1 Number of pulses (Only if isfirst) 1
sequence str Slit sequence around disk, with 0=closed, 1=open positions. NULL or "" will set a default sequence. "NULL"

Output parameters

Name Unit Description Default
delta_y  
height  
omega  
Sequence  
SequenceIndex  
nslit  
m  

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 | Output parameters | Links ]

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Wed Apr 19 10:57:33 2017


Last Modified: Wednesday, 19-Apr-2017 12:57:33 CEST
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