IFAE-ALBA | Alba, 13th December, 2012BL29 - BOREAS 1 of 20

BOREAS, Beamline Of REsonant Absorption and Scattering: status report

Javier Herrero

Contributions from M. Valvidares, E. Pellegrin, P. Gargiani

“Boreas running”, (460 b.c., Yale Univ.)

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HECTOR MAGNET

Absorption Endstation: XMCD/XMLD

Exitslit

RefocusingMirrror(KB)

Mono

Gascell

Optics hutch

General viewBOREAS

Scattering endstation (in prog.):XRMS,…

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MS XS PE1 PE2MS XS PE1 PE2MS XS PE1 PE2

• Full x-ray polarization control (APPLE-II undulator)

• 80-4000 eV energy range (~soft)

• Variable x-ray beam size and focal distance (KB system)

• (ES1) High-field SC vector magnet: 6T, 2T with 1.5K-370K sample temp.

• (ES2) UHV scattering chamber, 2T magnet, large angular access, 20K-350K

Beamline designed for soft x-ray polarization-dependent spectroscopy & scattering

highlights optical layout

BL overview – scientific case & optical layout

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E resolution with MEG

BL optics – photon energy resolution

BOREAS

- Instrumental resolution (E/E) ~ 10,000 for typically used 15/15 µm (entrance/exit) slits opening

Photon flux with MEG)

- Flux varying from 1010 to 1012 ph/s @ sample (depending on E)

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“HECTOR” 6 Tesla magnet @ UHV

- Running full experiments since May 2012

Scope

- X-ray absorption measurements with:

a) variable polarization incoming light

b) variable sample temperature

c) variable applied magnetic field

Detection systems:

- Electron drain current @ sample - working

- Si diode (transmission mode) - working

- Si diode (total fluorescence yield) - in progress (Si diodes made by IRD, model AXUV100)

Detection, planned:

- Si drift diode (or other) (partial fluorescence yield)

BOREAS

BL endstations – XMCD cryomagnet

Requirements: E window selection, E range ca. 200-3000 eV

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BOREAS

BL endstations– Scattering chamber

“MaReS” endstation concept. Expected end 2013

In-vacuum CCD by XCAM (CFT awarded)

In-vacuum magnet

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BOREAS

BOREAS

“MaReS” endstation concept Expected end 2013

In-vacuum CCD by XCAM (CFT awarded)

2D detection upgrade project

Alternatives for 2D detection

- Backthinned CMOS (comercially unavailable for soft x-rays when decission on CCD taken)

Requirements: large dynamic range, fast reading time, UHV compatible

Foreseen Detection systems:

a) Point detection (~“0D”)

- Si diode, from “IRD”, model SXUV700

- GaAsP diode, from “Hamamatzu”

- Channeltron (for high E, photon counting)

a) Spatially resolved detection (2D)

- Microchannel plate, from “Hamamatzu”

- CCD by “e2v”, 2k x 2k pixel, 20 micron pixel size; “XCAM” mouting (awarded)