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McStas: Moderator

[ Identification | Description | Input parameters | Links ]

The Moderator Component

A simple pulsed source for time-of-flight.

Identification

  • Site:
  • Author: KN, M.Hagen
  • Origin: Risoe
  • Date: August 1998

Description

Produces a simple time-of-flight spectrum, with a flat energy distribution

Example: Moderator(radius = 0.0707, dist = 9.035, focus_xw = 0.021, focus_yh = 0.021, Emin = 10, Emax = 15, Ec = 9.0, t0 = 37.15, gamma = 39.1)

Input parameters

Parameters in boldface are required; the others are optional.
NameUnitDescriptionDefault
radiusmRadius of source0.07
EminmeVLower edge of energy distribution
EmaxmeVUpper edge of energy distribution
distmDistance from source to the focusing rectangle0
focus_xwmWidth of focusing rectangle0.02
focus_yhmHeight of focusing rectangle0.02
t0musdecay constant for low-energy neutrons37.15
EcmeVCritical energy, below which the flux decay is constant9.0
gammameVenergy dependence of decay time39.1
target_index1relative index of component to focus at, e.g. next is +1 this is used to compute 'dist' automatically.+1
flux1/(s cm 2 st meV)flux1
AT ( , , ) RELATIVE
ROTATED ( , , ) RELATIVE

Links


[ Identification | Description | Input parameters | Links ]

Generated on 2023-09-19 20:01:36


Last Modified: Wednesday, 03-Jan-2024 19:59:10 CET
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