SampleEnvironment

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Sample environment at SINQ

Staff

Stephan Fischer, Walter Latscha (technicians)
Markus Zolliker (software)
Ben van den Brandt (group leader "Sample Environment and Polarized Targets")

Equipment

The broad range of research topics investigated at SINQ requires not only a large zoo of neutron scattering instruments but also a large collection of sample environment devices. At present, any temperature between 100 mK to 1400 K, any magnetic fields up to 9 T and any high pressure up to 30 kbar may be achieved. The PSI-Risų collaboration helped to complete the sample environment park in the direction to higher magnetic fields and very low temperatures for single crystals.

For details see the table with specific information about sample environment devices.

Closed Cycle Refrigerators

For temperatures between 4 K and 325 K, in general, closed cycle refrigerators are the best choice, as they are very easy to use. Our closed cycle refrigerators are mostly from CTI-Cryogenics, and from APD Cryogenics. The 4 K closed cycle machines are from Sumitomo Heavy Industries. The accuray of the temperature in a closed cycle machine (cold finger principle) is limited. See Test Report on a CTI.

Helium Cryostats

For temperature down to 1.5 K, or if a precise temperature is required, helium cryostats should be used. The working horse is the ILL Orange cryostat, manufactured at AS Scientific Products Ltd.

Dilution Cryostats

Dilution cryostats are used for very low temperatures down to millikelvin temperatures.
  • Two dilution cryostats for powder neutron diffraction were built in house. The two devices are to be used one after the other on the same instrument. This enables to change the sample on the instrument every 3 days with only a short loss of beam time.
  • From Risų we have a dilution stick for single crystals. They may be entered into a Helium-4 cryostat or into one of the Oxford Instruments Cryomagnets MA02 and MA09.

Furnaces

Actually, three furnaces are available covering the temperature range between RT and 1800 K. Two are constructed at the PSI. A third device was manufactured at the ILL (now available for AS Scintific). Please contact the sample environment group before any experiment with a furnace, as different aspects have to be discussed in advance.

Magnets

Supraconducting magnets are used to achieve magnetics fields up to 15 Tesla. The old 4 Tesla Magnet manufactured by Thor is limited in the temperature range, but has less stray fields and is therefore preferred on instruments with a magnetic environment. The Oxford Instruments Cryomagnets MA02 and MA09 from Risų may be used with sample temperatures from 300 K down to 0.1 K when combined with the dilution stick. For details see Magnet List.

Pressure Devices

The clamp cell pressure devices are manufactured at the Institute for High Pressure Physics (RAS Moscow). Pressures up to 30 kbar (3 GPa) may be achieved.

The temperature devices are controlled with the TECS software. A quick online-help for TECS is available.

Additional information: vapor pressure
calibration curves


Attachments:  furs.gif  mag.gif  ill.gif  dil_cryomagnet.jpg  ccr.gif 
This particular version was published on 26-Jan-2005 12:57:51 UTC by MarkusZolliker.