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TRIPLE AXIS

NSF: Triple Axis Spectrometer (TAS)

 

Schematic of NSF on BT-7 with Shielded Solenoid as polarizer and analyzer devices.
Schematic of NSF on BT-7 with Shielded Solenoids as polarizer and analyzer devices.
Credit: Wangchun Chen

 

 

The schematic shown above illustrates the use of NSFs on the BT-7, triple axis spectrometer. In this configuration, a NSF is used as both the polarizer and the analyzer. On the polarizer side (upstream of sample), a 3He cell is located inside a mumetal shielded box or "MAGIC" Box or a mumetal shielded solenoid. On the analyzer side (downstream of sample), a 3He cell is located inside a mumetal shielded solenoid. The polarization of each 3He cell is monitored using in-situ NMR. All Triple Axis publication can be found here.

PDF slide provided for presentation use: Neutron Spin Filters on BT-7

 

Specifications or NSF on BT-7 Triple Axis
BT7 Pol Beam Instrument Setup
Credit: Wangchun Chen
  • 3He cell as polarizer and analyzer
  • 3He polarization flipping capability
  • Elastic and inelastic measurements
  • Sample field magnitude: H ~ 10G
    • P \({\parallel}\) Q or P \({\perp}\) Q
  • Superconducting Magnet field: up to 2 T
  • Four cross-section polarization efficiency correction
    • both horizontal and vertical field
  • 3He transmission: \({\leq}\) 50% (for desired spin state)
  • Flipping ratio: \({\leq}\) 60

 

Contacts

Spin Filters

Instrument

Created May 17, 2018, Updated April 2, 2025