Polarimetry of the polarized hydrogen deuteride HDice target under an electron beam

Abstract

The study of the nucleon structure has been a major research focus in fundamental physics in the past decades and still is the main research line of the Thomas Jefferson National Accelerator Facility (Jefferson Lab). For this purpose and to obtain statistically meaningful results, having both a polarized beam and a highly efficient polarized target is essential. For the target, this means high polarization and high relative density of polarized material. Retrospectively, I am really happy and feel lucky that I had the chance to meet and work with such great people. I know I have a lot of ups and downs, and that I am not easy to live with every day, thus I would like to thank everybody I have met until now for putting up with me. viii

First Measurement of the E Double-polarization Observable for the γη to Κ⁺Σ^- with CLAS & a New Forward Tagger Hodoscope for CLAS12

“…The following sections outline these cryogenic containers, a far more detailed description of these can be found in [87] [93].…”

Polarization Observables from two-pion and ρ meson photoproduction on polarized HD target at JLab

“…and it depends on the the magnetic field B, the Temperature T, the nuclear magnetic moment µ and the Boltzmann constant K B . For maximum available values of B and the minimum values of T obtainable in a magnetic dilution refrigerator (B=15 Figure 3.2: Thermal equilibrium polarization (TE) for hydrogen and Deuterium vs B/T ratio [47].…”

“…Since the cells were different (having different amounts of HD an different number aluminum wires) the calibration was done fore every cell separately. The calibration was done at thermal equilibrium because this is the predictable known polarization [47]. The thermal equilibrium was reached within few relaxation times, typically (before aging) this was of the order of seconds for H and 10s to 100 s of D, depending on the concentration of impurities as well as the temperature and the magnetic field in the PD; consequently H and D quickly reached their respective thermal equilibrium polarizations.…”

Polarization observables for single and double charged pion photo-production with polarized HD target

“…In [49], the error is estimated using the flat noisy background and is related to the size of the integration range. The uncertainty on one data point in the background region can be computed as:…”