2022 JLAB REVIEW

2022 C1 Status Review of Tensor Spin Observables Experiments

Request to remove the C1 conditional to the b1 and Azz experiments

Figure 1. The left panel shows tensor enhancement using the technique of semi-saturating RF (ss-RF) with continuous rotation of the target material. The points corresponds to the measured NMR data and the red line is the lineshape fit of the NMR spectra. This fit was used to extract the tensor polarization value of 36+-3.5%. The full lineshape is composed of the magnetic sublevel transitions m=1 → 0 (Blue) and m=0 → -1 (pink) lines. The right panel shows the predicted vector and tensor enhanced polarizations as a function of accumulated dose during experimental conditions. The vertical dotted line indicates the dose at which an anneal will be performed in order to keep the overall tensor polarization at 30%. Full details for these plots and supporting documentation is provided in the links on this wikipage.

The b1 and Azz experiments were C1 conditionally approved by PACs 41&44, respectively, with the requirement that: "a tensor polarization of at least (close to) 30% be achieved and reliably demonstrated under experimental conditions." Links to the PAC reviews are provided below. Our collaboration has recently demonstrated that a tensor polarization of at least 30% will be achieved under experimental conditions. So we request Jefferson Lab to fully approve these two experiments.

The details supporting our request to remove the C1 conditionals are available here.

Recent Tensor Enhancement Papers by the Collaboration

Modeling alignment enhancement for solid polarized targets	Eur. Phys. J. A 53, 155 (2017) (arXiv)
Enhanced tensor polarization in solid-state targets	NIM A 981, 164504 (2020) (arXiv)

Experiment Information

Experiment	Scientific Rate	PAC Decision	PAC Results
The Deuteron Tensor Structure Function b1 (pdf)	A-	C1	link
Measurements of the Quasi-Elastic and Elastic Deuteron Tensor Asymmetries (pdf)	A-	C1	link