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McStas: ESS_2001_bispectral Instrument at ESS

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

The ESS_2001_bispectral Instrument

Instrument short description Bispectral extraction system

Identification

  • Site: ESS
  • Author: Henrik Jacobsen, contact: hjacobse@fys.ku.dk
  • Origin: NBI, ESS
  • Date: October 2012.
  • Version:(Unknown)

Description

Bispectral extraction: A thermal and a cold source at the same time. The neutrons from the cold source are reflected into the guide by a ~2.5m long mirror in front of the guide.


mcrun --mpi=2 bispectral_monitors -p flat_flatm_156m_bispectral_5deg.par -d flat_flatm_156m_bispectral_5deg -n 1e8




Input parameters

Parameters in boldface are required; the others are optional.
Name Unit Description Default
man_lam 1 0: use standard wavelength, overrides input parameters. 1: use input parameters 1
thermal 1 Choose which sources to use. 0: only cold source. 1: only thermal source. 2: both sources. 2
cold_Lam_min AA Minimum wavelength emitted by the cold moderator 0.1
cold_Lam_max AA Maximum wavelength emitted by the cold moderator 10
thermal_Lam_min AA Minimum wavelength emitted by the thermal moderator 0.1
thermal_Lam_max AA Maximum wavelength emitted by the thermal moderator 10
thermal_hotspot_fac 1 Intensity increase in thermal hot spot 1.0
cold_hotspot_fac 1 Intensity increase in cold hot spot 1.0
use_full_guide_flag 1 1: Use full guide. 2: Remove left part of guide to let cold neutrons through 0
guide_start m Distance from thermal moderator to guide start 2
Length m Distance from source to sample 150
focus_start_w m First horizontal focus in real space -1.2620
focus_end_w m Second horizontal focus in real space 150.3187
smallaxis_w m Width of small axis 0.2550
focus_start_h m First vertical focus in real space -2.1415
focus_end_h m Second vertical focus in real space 150.0778
smallaxis_h m Height of small axis 0.3847
maxdiv deg Maximum divergence detected 2.0
coldperthermal 1 Amount of simulated cold neutrons per thermal neutrons 30
mirror_type 1 The type of mirror. 0: no mirror. 1: flat mirror. 2: curved mirror. 2
mirror_coating_type 1 The coating distribution of the mirror. 1: same for all plates. 2: parabolic 1
mirror_offset m The offset of the center of the mirror in the x direction 0
theta1 deg The angle of the first mirror plate 1.25
theta2 deg The angle of the central mirror plate 1.25
theta3 deg The angle at the end of the mirror 1.25
m_mirror 5
h_mirror m The height of the part of the mirror that is outside the guide 0.15
Pulse_width s Length of the long pulse. 0.00286
frequency Hz Frequency of source 14.0
gravity m/s^2 Gravitational acceleration -9.81
substrate_thickness m The thickness of the substrate of the mirror 0.0005
coating_thickness m The thickness of the coating of the mirror 10e-6
m1 5
m2 4

Links


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

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Mon Jun 26 12:27:17 2017


Last Modified: Monday, 26-Jun-2017 14:27:17 CEST
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