Difference between revisions of "2022 JLAB REVIEW"

Revision as of 14:42, 20 May 2022

The b1 and Azz experiment collaborations request that Jefferson Lab remove the C1 conditional approval assigned by the PAC and fully approve these experiments. On this page we provide a summary of the progress that has been made to address the conditional status.

Progress in Tensor Enhancement

Figure 1. (Left) NMR spectra after ss-RF and target rotation resulting in a tensor polarization of 36.5+-3.5%. (Right) Vector and tensor polarizations with respect to the dose in beam. The vertical line indicates when annealing will be performed in the target.

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.

As a brief summary, the left panel of the figure above 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 of the figure 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.

Recent Tensor Enhancement Papers by the Collaboration

Experiment Information