Unified Data Sheet

P64 - High Flux EXAFS Beamline

P64 is dedicated to EXAFS experiments, which require high flux, like QEXAFS in the sub-second timescale, EXAFS on highly-diluted systems, and to high-resolution resonant x-ray emission spectroscopy. The energy range covers 4-45keV.

 


GENERAL SPECIFICATIONS

techniques available

EXAFS, QEXAFS, RXES

photon source
undulator
period
number of periods
max power

32.9 mm
       60

source brilliance 
10 18 ph /s / 0.1% bw / mA    (max. 100mA)
polarization available
linear horizontal
energy range 


       4 keV - 44 keV

beamline energy resolution


       deltaE/E = 1.4 x 10-4 resp. 0.6 x 10-4

max flux ON SAMPLE

1x1013 ph/s at 8.9 keV
(calculated, tuned undulator)
1x1012 ph/s at 8.9 keV
(calculated, tapered undulator)

spot size ON SAMPLE 

150 μm x 50 μm 2 mm x1 mm

sample type


       any

 

OPTICS

type

liq. N2 cooled Double Crystal Monochromator

available reflections
Si111  and  Si311
energy range         
4.5 keV - 70 keV
resolving power 
E/deltaE : 1x104 ... 2x104

type


       Mirror 1 and 2


Coating

Silicon
Platinum
Rhodium

Energy Range

4-25keV

Usage

Harmonic rejection (4-10keV, 9keV-20keV, 14-25keV)
focussing (4-20keV)


        



       ENDSTATION


EXAFS, QEXAFS

Experimental Table

Breadboard with X95 rail

Beam height over rail 

28cm

Sample environment 

Vacuum sample cross with standard motorized sample holder for 5 samples
Closed cycle cryostat with sample cell and He exchange gas, T range 4K - 290K, LakeShore temperature controller, motorized sample holder for 5 samples, sample load lock
sufficient space for user equipment

RXES

Experimental Table

Aluminum plate

Beam height

28cm

Sample
environment
 

Vacuum
user-defined equipment

DETECTOR(S)

Detection modes
Transmission 

yes

Refraction   

no

Fluorescence           

yes

Total electron yield

no

Grazing incidence angle    

yes



Point Detector(s)
Type 


        Ion Chambers

energy resolution 
 none
count rate 


       linear up to 1013 cts/s  


       Beam Size   


       given by slits


         typical collection time


       50ms to 300s per EXAFS scan

Fluorescence Detector
Type 
Canberra 100 element 
energy resolution 

250 eV at 5.6keV 

count rate 


       105 Hz per element 

2theta range  


       fixed at 90°

  typical collection time

0.1s - 5s

 

CONTROL/DATA ANALYSIS

Software type


       Spok, Tango, Taurus

Data output type


       spectra, parameters such as temp., press, etc.

Data output


       ASCII

Software(s) for quantitative analysis


       Athena, Artemis, FEFF


        



       SUPPORT LAB



       A chemical lab with a hood and a glove box is adjacent to the control hutch.A typical pellet press and most basic equipment is available.


PreAmps
Preamps of the 100 Element Ge-Detector