Polarization measurement in the COMPASS polarized target

Continuous wave nuclear magnetic resonance (NMR) is used to determine the target polarization in the COMPASS experiment. The system is made of the so-called Liverpool Q-meters, Yale-cards, and VME modules for data taking and system controlling. In 2001 the NMR coils were embedded in the target mater...

Descripción completa

Detalles Bibliográficos
Autores principales: Kondo, K, Ball, J, Baum, G, Berglund, P, Doshita, N, Gautheron, F, Görtz, S, Hasegawa, T, Horikawa, N, Ishimoto, S, Iwata, T, Kisselev, Yu V, Koivuniemi, J H, Le Goff, J M, Magnon, A, Meyer, W, Reicherz, G, Matsuda, T
Lenguaje:eng
Publicado: 2004
Materias:
Detectors and Experimental Techniques
Acceso en línea:https://dx.doi.org/10.1016/j.nima.2004.03.153
http://cds.cern.ch/record/816647
Descripción
Sumario:Continuous wave nuclear magnetic resonance (NMR) is used to determine the target polarization in the COMPASS experiment. The system is made of the so-called Liverpool Q-meters, Yale-cards, and VME modules for data taking and system controlling. In 2001 the NMR coils were embedded in the target material, while in 2002 and 2003 the coils were mounted on the outer surface of the target cells to increase the packing factor of the material. Though the error of the measurement became larger with the outer coils than with the inner coils, we have performed stable measurements throughout the COMPASS run time for 3 years. The maximum polarization was +57% and -53% as the average in the target cells.

Ejemplares similares