[ Identification | Description | Input parameters | Links ]

The ILL_SALSA Instrument

Identification

• Site: ILL
• Author: Daniel Lomholt Christensen
• Origin: ILL, Grenoble, France
• Date: 14:28:08 on January 23, 2024

Description

ESCRIPTION
SALSA is a instrument developed mainly for measuring residual stress
in a gauge volume defined by its collimators.
The instrument has three possible collimator positions, with three available collimators at each position.
This allows the gauge volumed to be defined in height, width and depth.
The size of the gauge volume is chosen in the collimator parameters. The following values correspond to sizes
in a dictionary format.
The vertical collimator {0: 2mm, 1: 4mm, 2: 10mm}
The horizontal collimator {0: 0.6mm, 1: 2mm, 2: 4mm}
The depth collimator {0: 0.6mm, 1: 2mm, 2: 4mm}

The instument showcases the Monochromator_bent component,
and the focusing use of the Collimator_radial component.

Some of the monitors used in this instrument are not actually present in the real instrument.
The only detector that is actually there, is the final monitor.
Furthermore the sample environment is of course variable depending on the sample
in question.

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
lambda_mean	Å	Desired wavelength of neutrons coming off of the monochromator.	1.66795
lambda_spread	Å	Range over which the neutrons are produced. lambda_mean +- lambda_spread.	0.0224372
m	1	m-value of whole guide coating. 0 absorbing, 1 for Ni, 1.2 for Ni58, 2-4 for SM	2
mip	1	m-value of in-pile guide coating	2
monochromator_horizontal_radius	m	Radius of the horizontal cylinder the monochromator is bent on.	2.6
takeoff_angle	deg	Takeoff angle of the instrument	75.8
mono_rotation	deg	Rotation of monochromator in the horizontal plane. Omega angle in SALSA	37.9
lamellas	1	Number of lamellas in the monochromator array	16
monochromator_slabs	1	Number of slabs of lamellas placed on top of each other in the monochromator array	39
vertical_mono_radius	m	Radius of the cylinder the monochromator is bent on vertically	2.2
vertical_focus	mm	Choice of collimator focus in mm. Choose either 2, 4, or 10.	2
horizontal_focus	mm	Choice of collimator focus in mm. Choose either 0.6, 2, or 4.	0.6
outgoing_focus	mm	Choice of collimator focus in mm. Choose either 0.6, 2, or 4.	0.6
measuring_angle	deg	Angle between the outgoing collimator and sample. Rotates in the negative direction of revolution. I.E with the clock.	50
Debug			0

Links

• Source code for ILL_SALSA.instr.

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[ Identification | Description | Input parameters | Links ]

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Last Modified: Monday, 30-Jun-2025 11:05:10 CEST