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![[Figure 4]](kv5005fig4mag.jpg)
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Figure 4
The helium-purged beam path (HePBP) at the XRD1 beamline at Elettra. (a) Schematic representation of the HePBP. The helium atmosphere reaches from the end of the beamline vacuum system all the way to the detector without any windows in the path. Helium is supplied into the system by the use of a modified cryostream cooler which uses gaseous He cooled to liquid-nitrogen temperature for cooling the crystal. The collimation system C (containing the slit system, the collimator and the ionization chambers IC1 and IC2 for table alignment) is also part of the HePBP. (b) Photograph showing the opened HePBP. A plastic PVC box encloses the rotation axis, the collimation system C and the modified cryostream cooler. A flexible rubber bellow mounted on the MarCCD165 detector is pressed against the PVC enclosure by the detector itself, when the sample-to-detector distance is in the range between 35 and 80 mm, ensuring a helium atmosphere produced and maintained by the cryostream cooler. A valve at the bottom of the box allows a regulation of the pressure within the HePBP. (More photographs of the HePBP mounted on the Marresearch standard base can be seen on the web pages of the Structural Biology Laboratory at Elettra, https://www.elettra.trieste.it/organisation/experiments/laboratories/structural_biology/softxrays/). |
![[Figure 4]](kv5005fig4.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
