Technical information (XAS)

 

Photon delivery system

 Source

1.9T Wiggler
 Available Energy range 4 - 50 keV
 Optimal Energy range # 4 - 22 keV focussed with Si(111)
5.5 - 37 keV focussed with Si(331)
4 - 45 keV unfocussed
 Resolution deltaE/E Crystal dependent:
Si(111) ~ 1.5x10-4
Si(311) ~ 4x10-5
Si(333) reflection from Si(111)
Nominal beam size at sample
(horizontal x vertical)

 Variable from 2 (h) x 1 (v) mm
 to 0.5 (h) x 0.2 (v) mm

 Photon flux at sample  > 5x1012 ph/s (4 - 22 keV)
> 1x1011 ph/s using Si(311)
Harmonic content at 5-20 keV   < 10-5

# Mode 1 4 - 10 keV focussed ~ 0.5 x 1mm Si(111) 1010 - 1012 ph/s
   Mode 2 8 - 18 keV focussed ~ 0.5 x 1 mm Si(111) 1010 - 1012 ph/s
   Mode 4 15 - 35 keV focussed ~ 0.5 x 1 mm Si(311) 109 - 1011 ph/s
   Mode 5 10 - 42 keV unfocussed < 3 x 15 mm Si(311)

Note that Mode 5 uses no mirrors and thus there is limited control over harmonic content (not ideal for XAS experiments).

 

 Detectors and Ancillaries

The beamline consists of two experimental stations: 1st hutch and 2nd hutch.

In the 1st hutch standard experiments are run. These are experiments requiring little or no modification from one user group to the next in terms of hardware setup. That limits the type of experiments to samples prepared in our standard sample holders to be measured either at ambient temperature and pressure or in our cryostat in transmission or fluorescence mode.

In the 2nd hutch non-standard experiments may be run. This type of experiments include users having their own apparatus (e.g. sample cells or detectors) or special samples (e.g. large, fragile, radioactive, toxic or bio-hazards).

 

1st HUTCH
2nd HUTCH (from 2013)
 
Optical table, 1.2 by 2.4 m
 
Optical table, 1.2 by 2.4 m
100 element Ge fluorescence detector
Fluorescence detector not yet available
3 flow through ion chambers
3 flow through ion chambers
Cryostat, 12K to 300K
Heating stage (no liquids), ambient to 1200°C
Room temperature holder
Room temperature holder
Energy calibration sample holder
Energy calibration sample holder
Harmonic rejection mirror
 
Fast shutter