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Title: Boosting Deuteron Polarization in HD Targets: Experience of moving spins between H and D with RF methods during the E06-101 experiment at Jefferson Lab

Abstract

Solid HDice targets are polarized by bringing the HD crystal to thermal equilibrium at low temperature and high magnetic field, typically 10-20 mK and 15 Tesla, at Jefferson Lab. In this regime, due to its smaller magnetic moment, the resulting polarization for D is always at least three times smaller than for H. The controlled amount of polarizing catalysts, o-H2 and p-D2, used in the process of reaching a frozen-spin state, further limit the maximum achievable D polarization. Nonetheless, H and D polarizations can be transferred from one to the other by connecting the H and D sub-states of the HD system with RF. In a large target, the RF power needed for such transitions is effectively limited by non-uniformities in the RF field. High efficiency transfers can require substantial RF power levels, and a tuned-RF circuit is needed to prevent large temperature excursions of the holding cryostat. In this paper, we compare the advantages and limitations of two different RF transfer methods to increase D polarization, Forbidden Adiabatic and Saturated Forbidden RF Transitions. The experience with the HD targets used during the recently completed E06-101 experiment in Hall-B of Jefferson Lab is discussed.

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1136931
Report Number(s):
JLAB-PHY-14-1789; DOE/OR/23177-2951
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Conference
Journal Name:
PoS PSTP2013
Additional Journal Information:
Conference: PSTP 2013, Charlottesville, VA, USA, September 9-13, 2013
Country of Publication:
United States
Language:
English

Citation Formats

Wei, Xiangdong, Bass, Christopher, D'Angelo, Annalisa, Deur, Alexandre, Dezern, Gary, Kageya, Tsuneo, Laine, Vivien, Lowry, Michael, Sandorfi, Andrew, Teachey, Robert, Wang, Haipeng, and Whisnant, Charles. Boosting Deuteron Polarization in HD Targets: Experience of moving spins between H and D with RF methods during the E06-101 experiment at Jefferson Lab. United States: N. p., 2014. Web.
Wei, Xiangdong, Bass, Christopher, D'Angelo, Annalisa, Deur, Alexandre, Dezern, Gary, Kageya, Tsuneo, Laine, Vivien, Lowry, Michael, Sandorfi, Andrew, Teachey, Robert, Wang, Haipeng, & Whisnant, Charles. Boosting Deuteron Polarization in HD Targets: Experience of moving spins between H and D with RF methods during the E06-101 experiment at Jefferson Lab. United States.
Wei, Xiangdong, Bass, Christopher, D'Angelo, Annalisa, Deur, Alexandre, Dezern, Gary, Kageya, Tsuneo, Laine, Vivien, Lowry, Michael, Sandorfi, Andrew, Teachey, Robert, Wang, Haipeng, and Whisnant, Charles. 2014. "Boosting Deuteron Polarization in HD Targets: Experience of moving spins between H and D with RF methods during the E06-101 experiment at Jefferson Lab". United States. https://www.osti.gov/servlets/purl/1136931.
@article{osti_1136931,
title = {Boosting Deuteron Polarization in HD Targets: Experience of moving spins between H and D with RF methods during the E06-101 experiment at Jefferson Lab},
author = {Wei, Xiangdong and Bass, Christopher and D'Angelo, Annalisa and Deur, Alexandre and Dezern, Gary and Kageya, Tsuneo and Laine, Vivien and Lowry, Michael and Sandorfi, Andrew and Teachey, Robert and Wang, Haipeng and Whisnant, Charles},
abstractNote = {Solid HDice targets are polarized by bringing the HD crystal to thermal equilibrium at low temperature and high magnetic field, typically 10-20 mK and 15 Tesla, at Jefferson Lab. In this regime, due to its smaller magnetic moment, the resulting polarization for D is always at least three times smaller than for H. The controlled amount of polarizing catalysts, o-H2 and p-D2, used in the process of reaching a frozen-spin state, further limit the maximum achievable D polarization. Nonetheless, H and D polarizations can be transferred from one to the other by connecting the H and D sub-states of the HD system with RF. In a large target, the RF power needed for such transitions is effectively limited by non-uniformities in the RF field. High efficiency transfers can require substantial RF power levels, and a tuned-RF circuit is needed to prevent large temperature excursions of the holding cryostat. In this paper, we compare the advantages and limitations of two different RF transfer methods to increase D polarization, Forbidden Adiabatic and Saturated Forbidden RF Transitions. The experience with the HD targets used during the recently completed E06-101 experiment in Hall-B of Jefferson Lab is discussed.},
doi = {},
url = {https://www.osti.gov/biblio/1136931}, journal = {PoS PSTP2013},
number = ,
volume = ,
place = {United States},
year = {Sun Jun 01 00:00:00 EDT 2014},
month = {Sun Jun 01 00:00:00 EDT 2014}
}

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