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Computing for Science

The Computing for Science (CS) group supports ILL scientists, students and visitors in a number of activities including data analysis, instrument simulation and sample simulation.

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ILL Reactor models

ILL H5 beam tube (horizontal cold source, feeding guides to ILL22)

  • Diameter: 242 mm
  • Angle from RHF origin: 186.36 deg
  • Type: cold HCS
  • Distance from D2O vessel to the Bouchon: 4.72 m
  • Distance from noze to the D2O vessel: 0.774 m
  • Instrument using it: IN14, IN16, D16, D22, IN15, SuperADAM, ...
  • Reactor cut showing MCNP geometry [ pdf ]

This is ILL Data. Simulated by E. Farhi, P.A. Harraud (DS/CS) and S. Fuard (DPT/BPC), 2006.

Simulation overview


Beam tube

Measurement Capture Flux
[1010 n/s/cm2 gold foil]

(dist from core center, date)

Comment

MCNP Capture Flux 
[1010 n/s/cm2]

Tripoli Capture Flux
[1010 n/s/cm2]

H5 (IN14, IN16, D16, D22, IN15, ...)


2.0 (Dec 2006)

most guides m=2, starting at 2.33 m.

10.0 +/- 0.1 [Phi=7.8]
1.88 +/- 0.05 [Phi=0.74]

10.1 +/- 0.6 [Phi=7.6]
2.18 +/- 0.04 [Phi=.66]

Flux measured and simulated with MCNP and Tripoli at 5.2 m from the core (bouchon). Phi is the integrate rwa flux. The Capture flux is the integrated weighted flux (lambda/1.8). Fluxes given here assume NO guide.


Flux distributions at the Vanne de securite/Bouchon (5.2 m from core). No guide model.

  • Spatial: homogeneous.
  • Divergence: gaussian, 0.95 deg half width horizontally and vertically.
  • Wavelength is not correlated to position
  • Wavelength is correlated to divergence


Simulation results

All tallies/monitors are given at L+5.2 m from the reactor core, per cm2, and usually as log10(intensity).

Overview
[ ps ][ raw ]


Wavelength spectrum [0-10 Angs]
[ ps ][ raw ]

Angular distribution (divergence)
[ ps ][ raw ]


Spatial distribution

[ ps ][ raw ]


Horizontal divergence - wavelength correlation

[ ps ][ raw ]