The marmuXTM system
Complete turn-key system for X-ray crystallography
Chapters: Overview | Performance | Specifications | Downloads
1. Overview
Please, click the small images for a full scale image.
Source, table and mar345dtb
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Source tower
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Interface optics/dtb
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Generator controller
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- a micro-beam X-ray generator operating at 50 Watts, producing a microfocus spot with a size of 50 by 50 microns
- a modern multi-layer optic producing a spot size at the sample of approx. 200 by 200 microns
- a marresearch desktop beamline TM (mardtb) multi-purpose goniometer system
- a mar345TM image plate detector with 345 mm diameter
- an Oxford Cryostream low temperature unit
- a functional and stable table with plenty of space for all electronics and attachments.
- an optional table top radiation enclosure
The marmuX is modular built and can easily be expanded to include the mardtb easymount or the marcsc sample changer.
2. Performance
In experiments that we have carried out very carefully, we could show that the marmuX system can produce data comparable to traditional high-power rotating anode systems. In a test using lysozyme crystals it was possible to collect data of good enough quality for sulfur-SAD-phasing using only 90 degrees of data. The experiments are describer in detailed in the application note mar.AN260107 from Jan 26, 2007
In a second application note mar.AN070207 from Feb 07, 2007, a direct comparison between the marmuX system and a rotating anode generator using the same experimental conditions (same crystals, exposure times, detector, etc.) revealed that small crystals produce superior data with the marmuX system while the results for larger crystals are virtually identical.
3. Specifications
| X-ray source: | GeniX micro-beam 50 kV/1 mA |
| Optics: | Xenocs multi-layer optic |
| Beam size at sample | 210 x 210 microns |
| Beam divergence | < 5 mrad |
| Anode coupling | built-in water/air refrigerated chiller |
| Mirror protection | diaphragm vacuum pump with interlock to shutter |
| Detector: | mar345 image plate |
| Plate diameter | 345 mm |
| Pixel size | 100 or 150 micron (software selectable) |
| Cycle times | 36-108 sec (depending on diameter and pixelsize) |
| Dynamic range | 17 bits (1-131000) |
| Sensitivity | 1.5 X-ray photons equivalent |
| Goniometer | mardtb 2-axis multi-purpose goniometer with automatic X-ray bea alignment and continuous monitoring of the primary beam intensity |
| Optional accessories for mardtb |
- built-in motorized goniometer head - easymountTM automatic mounting system - marcscTM (cryogenic sample changer) |
| Cryo-cooler: | Oxford Cryostream 700 |
| Liquid nitrogen auto-refill system | Capacitance based level control |
| Experimental table: | - 1700 x 1000 x 800 mm (w:d:h), stainless steel - magnetic table top and aluminum table frame |
| Options: | Radiation enclosure with sliding doors and shutter interlock system |
4. Downloads
Please, download the marmuXTM product brochure for a summary of the product properties and specifications as well as product application notes that demonstrate the capabilities of the system.
| Description | Size (MB) | Action |
| Product brochure | 1.4 | |
| Sulfur-SAD-phasing of hen egg lysozyme with Cu-radiation obtained in-house with a GeniX micro-beam generator | 2.6 | |
| Comparison of a conventional rotating anode generator with a Xenocs GeniX micro-beam generator | 1.3 |
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