Next generation instrument

A leap in functionality

 

We consider the GANESHA to be a next generation SAXS system for the home laboratory due to the incorporation of significant leaps in functionality and user friendliness, compared to prior commercial systems.

We consider particularly the following functionality leaps to be most significant :

 

• The possibility for the detector to be moved automatically inside the vacuum-tank to cover a wide range of scattering angles from low-q SAXS to true WAXS.

 

• The motorization of collimator, sample positioning, and the detector means that user alignment can be completely automated, and the instrument can make intelligent use of the various achievable intensity and resolution combinations, specifically:

     o The motorization of the pinholes allows the system to automatically 

          - change between different pinhole configurations 

          - optimize the intensity in the beam without user interaction

     o The motorization of the detector and associated beam stop allows for both

          - automated alignment of the beam stop in the beam

          - automatically shifting the position of the detector to acquire additional data in a different q-range

          (a total q-range of 2E-3 Å-1 to ~3Å-1 is possible) - see note 1 -

 

• The use of the Pilatus detector - see note 2 - provides the following advantages over existing SAXS detectors (gas, image plate and CCD)

     o Low background on par with (or better than) gas-detectors due to individual Photon counting capability with rejection of noise 

and cosmic radiation

     o No parallax

     o A very fine detector resolution (172 microns)

     o A high detection efficiency at 8 keV

     o A very high maximum pixel count rate (2 million counts per second per pixel)

     o No damage to the detector if hit by the primary beam in the laboratory

 

• Changing between SAXS, WAXS, GISAXS, and Reflectometry configuration is only a software issue, not requiring any alteration to the instrument hardware - see note 3 -

 

• The possibility to control and monitor the measurement process remotely

 

NOTES:

1 - Limits will depend on actual detector size and sample environment

2 - The Pilatus detector is a revolutionary imaging solid state detector, developed at the Swiss Light Source, and now sold by the Swiss company Dectris

3 - Requires a sample stage with a rotation and a GISAXS/Reflectometry beam stop

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