[ Identification | Description | Input parameters | Links ]

The ISIS_MERLIN Instrument

Identification

• Site: ISIS
• Author: Rob Bewley
• Origin: ISIS (UK)
• Date: May 2017.

Description

Merlin has been in user operation since 2008. It was designed to be a high intensity, medium energy
resolution spectrometer that would complement the high-resolution MAPS spectrometer, and replace
the HET spectrometer. Merlin's design exploited recent advances in technology with a supermirror
guide to enhance flux, as well as 3 m long position-sensitive detectors in a vacuum, making it
ideal for the study of single crystals. The detector bank covers a massive \pi steradians of solid
angle with an angular range from -45 to 135 degrees in the horizontal plane, and \pm 30 degrees in
the vertical plane. This allows large swathes of Q,\omega space to be accessed in a single run.

Since 2014, Merlin has been running in event mode, and by using the new Gd chopper combined with a
disk chopper, it is able to run in repetition-rate multiplication (RRM) mode, allowing users to
simultaneously measure with several incident energies.

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
E_min	meV	lowest energy sampled [meV]	1.0
E_max	meV	highest energy sampled [meV]	2000.0
m	float	m value of guides	3.0
E_foc	meV	energy selected by chopper [meV]	80.0
nu_hz	Hz	frequency of chopper rotation [Hz]	200.0
type	int	chopper package selected sloppy chopper = 1, B chopper = 2, Gd chopper = 3	3

Links

• Source code for ISIS_MERLIN.instr.
• http://www.isis.stfc.ac.uk/instruments/merlin

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[ Identification | Description | Input parameters | Links ]

Generated on 2024-01-03 11:47:43

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Last Modified: Tuesday, 17-Sep-2024 05:31:14 CEST