Progress on the NMR interaction region for a Schiff moment measurement in 205TlF with CeNTREX
POSTER
Abstract
The Cold Molecule Nuclear Time-Reversal Experiment (CeNTREX) aims to search for time-reversal-symmetry violation in the hadronic sector by measuring the Schiff moment of the $^{205}$Tl nucleus. In the CeNTREX interaction region, nuclear magnetic resonance (NMR) is performed in the presence of a 30 kV/cm electric field using a Ramsey-type separated oscillatory fields technique, where a non-zero Schiff moment would introduce a frequency shift.
The electric field is produced between a pair of 3-m-long glass electrodes machined with a Rogowski profile and coated with a conductive layer composed of a graphite-potassium silicate mixture. This coating has been tested to withstand electric field strengths of up to 60 kV/cm while maintaining vacuum compatibility. Achieving a highly uniform electric field and structural stability over the interaction region requires precise electrode alignment and careful control of electrode geometry.
This poster presents recent progress on the construction of the CeNTREX interaction region, including high-voltage testing of the conductive coating, mechanical alignment of the electrodes, and geometrical calibration of the glass vacuum chamber. The development of a precision calibration system for electrode positioning and field uniformity is also described. These efforts establish the electric-field environment required for the CeNTREX Schiff moment search.
The electric field is produced between a pair of 3-m-long glass electrodes machined with a Rogowski profile and coated with a conductive layer composed of a graphite-potassium silicate mixture. This coating has been tested to withstand electric field strengths of up to 60 kV/cm while maintaining vacuum compatibility. Achieving a highly uniform electric field and structural stability over the interaction region requires precise electrode alignment and careful control of electrode geometry.
This poster presents recent progress on the construction of the CeNTREX interaction region, including high-voltage testing of the conductive coating, mechanical alignment of the electrodes, and geometrical calibration of the glass vacuum chamber. The development of a precision calibration system for electrode positioning and field uniformity is also described. These efforts establish the electric-field environment required for the CeNTREX Schiff moment search.
*This work is funded by the Heising-Simons Foundation, a NIST Precision Measurement Grant, NSF-MRI grants PHY1827906, PHY-1827964, and PHY-1828097, NSF grant PHY-2110420, and the Department of Energy (DOE), Office of Science, Office of Nuclear Physics, under contract number DEAC02-06CH11357 and grant number DE-SC0024667.
Presenters
-
Junlin Wu
- University of Massachusetts Amherst