Melanie and Robert Battery Cell

Sample Environment of the POWGEN Instrument

Sample Holders

Various sample holders are used for the sample environment equipment mentioned below. For photos and detailed information about materials and dimensions, please refer to the document Powgen sample cans.

Powgen Automatic Changer

The Powgen Automatic Changer (PAC) is the second generation sample changer that was developed for Powgen. The changer has a carousel that holds a maximum of 24 sample-filled vanadium cans, and data may be collected in a temperature range of 10 to 300 K.  The cool down time from room temperature to 10 K is 30 minutes. However, samples can be changed at 10 K, which takes about 20 minutes.

Vacuum Furnace

A traditional vacuum furnace built with vanadium heating elements is available for high-temperature measurements from room temperature to 1200°C. Cooling to 100°C takes approximately 4 hours. The vacuum level of the furnace is ~2 x 10-5 torr. The aluminum tail of the furnace has been modified with vanadium windows for the primary beam.  Installing a niobium heating element increases the maximum temperature to 1600ºC; however, Q coverage is limited due to the Nb peaks observed in the back- and forward-scattering detectors.

This furnace can also be configured to have a quartz insert that allows flow of various gas mixtures through the sample using the gas handling system. The sample is loaded in a quartz basket with frit at the bottom and quartz wool on top for easy flow of gas through the sample. The furnace is capable of heating up to 850°C with this insert.

Orange Cryostat

This is a standard 50 mm bore orange cryostat with modified tails similar to the vacuum furnace to eliminate aluminum in the path of the primary neutron beam. Temperature range is 2 to 300 K.

Cryo-Furnace (JANIS)

This is a top loading CCR which has two sticks. The cold stick has a temperature range of 5K-500K and the hot stick can go from 30K-750K.  PAC cans shown above are used with the cold stick. The hot stick uses NIST furnace cans.

Slim Sam (5T Magnet)

Slim Sam is a 5T vertical magnet with a cryo-stick that can go down to 2K. However, this has aluminum in the path of the primary beam and hence has substantial Al peaks. Users are strongly encouraged to discuss with instrument staff before requesting the magnet for their proposals.