CASSIOPEE | WayForLight

Synchrotron SOLEIL

CASSIOPEE

The CASSIOPEE beamline is a soft X-ray beamline dedicated to high resolution ARPES, spin-resolved photoemission and resonant spectroscopies in the 8 eV-1500 eV photon energy range. This wide energy range allows both surface and bulk studies of condensed matter. The beamline uses two undulators as a source with high flux and adjustable polarisation. The energy is selected by a high resolution PGM (Plane Grating Monochromator) with VLS (Variable Line Spacing) and VGD (Variable Groove Depth) gratings for best efficiency and spectral purity of the light. After the monochromator, the beamline is divided into two branches, supplying photons to two end stations (Spin-resolved Photoemission, and High Resolution Angle-resolved Photoemission), both connected to a Molecular Beam Epitaxy chamber for sample growth and caracterisation.

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Beamline Energy Resolution

6 * 10^-3 [eV] @ 20 [eV]

Beamline Resolving Power

3 * 10^-4 [E/deltaE] @ 20 [eV]

Beamline Energy Range

8 - 1500 [eV]

Max Flux On Sample

5.5 * 10¹⁰ [ph/s] @ 50 [eV]

Spot Size On Sample Hor

50 - 75 [um]

Spot Size On Sample Vert

25 - 50 [um]

Angle Of Incidence Light On Sample Value

0 - 90 [degrees]

Photon Sources

HU256

Type

Undulator

Available Polarization

Linear horizontal, Linear vertical, Circular

Variable Polarization

Yes

Energy Range

8 - 150 [eV]

Number Of Periods

Period

256 [mm]

HU60

Type

Undulator

Available Polarization

Linear horizontal, Linear vertical, Circular

Variable Polarization

Yes

Energy Range

100 - 1500 [eV]

Number Of Periods

Period

60 [mm]

Monochromators

Monochromator

Energy Range

8 - 1500 [eV]

Type

SX700

Resolving Power

2.5 * 10⁴ [deltaE/E]

Grating Type

Plane, VLS, VGD

Endstations or Setup

ARPES

Description

6-axis manipulator
Temperature from 17 to 300K

Spectrometer

Scienta R4000

Base Pressure

1 * 10¹⁰ [mbar]

Endstation Operative

Yes

Sample

Sample Type

Crystal

Mounting Type

Omicron plate

Required Sample Size

X = 8 [mm], Y = 8 [mm]

Techniques usage

Photoelectron emission / Angular Resolved PES

Yes

Photoelectron emission / UPS

Yes

Photoelectron emission / XPS

Yes

Manipulator or Sample stage

Description

In-house developped cryogenic sample holder. Temperature from 17 to 300 K

Degrees Of Freedom

Translator Stages

Cradles

Positioning Precision

X = 0.01 [mm], Y = 0.01 [mm], Z = 0.01 [mm]

Range Of Movement

X = 8 [mm], Y = 8 [mm], Z = 10 [mm]

MBE

Description

The CASSIOPEE MBE chamber is equipped for surface science: Ion gun, LEED, RHEED, Auger Spectroscopy and 3 sample stages:
1. Electron bombardment heating and phi rotation for RHEED measurement
2. Simple stage
3. Direct current heating

Base Pressure

1 * 10¹⁰ [mbar]

Endstation Operative

Yes

Sample

Sample Type

Crystal, Liquid, Other:

Mounting Type

Omicron plate

Required Sample Size

X = 8 [mm], Y = 8 [mm]

Manipulator or Sample stage

Degrees Of Freedom

Translator Stages

Cradles

Spin-resolved photoemission

Description

The Spin-Resolved Photoemission setup is equipped with a MBS-A1 electron analyzer coupld to a spin manipulator and a V-LEED type FERRUM detector from FOCUS allowing the measurment of the spin polrization along three directions.

Spectrometer

MBS-A1

Base Pressure

1 * 10¹⁰ [mbar]

Detectors Available

FERRUM

Endstation Operative

Yes

Sample

Sample Type

Crystal

Mounting Type

Omicron plate

Required Sample Size

X = 8 [um], Y = 8 [um]

Techniques usage

Photoelectron emission / Angular Resolved PES

Yes

Photoelectron emission / Spin-resolved ARPES

Yes

Photoelectron emission / UPS

Yes

Photoelectron emission / XPS

Yes

Manipulator or Sample stage

Degrees Of Freedom

Translator Stages

Cradles

Detectors

FERRUM

Type

FERRUM V-LEED type spin detector

Description

Two axis V-LEED spin detector

Atomic Composition

FeO

Detection

Detected Particle

Electron

contacts

Bertran François

Le Fèvre Patrick

Julien Rault

Techniques

Photoelectron emission

Angular Resolved PES
Spin-resolved ARPES
UPS
XPS

Disciplines

Physics

Hard condensed matter - electronic properties
Nanophysics & physics of confined matter
Surfaces, interfaces and thin films

control/Data analysis

Control Software Type

Igor pro

Data Output Type

spectra or images

Data Output Format

ascii or Igor pro packed experiments

Softwares For Data Analysis

Igor pro

Equipment That Can Be Brought By The User

Vacuum suitcase
Evaporators