The Katrin experiment and the pre-spectrometer at reduced retarding potential

作者：Prall M^*

来源：Progress in Particle and Nuclear Physics, 2011, 66(2): 418-423.

DOI：10.1016/j.ppnp.2011.01.044

• Neutrino mass
• Tritium beta decay
• MAC-E filter
• Astroparticle physics
• Particle physics

The KArlsruhe TRItium Neutrino experiment, KATRIN [21] will determine the mass of the (nu) over bar (e) with a sensitivity of 0.2 eV (90% C.L.) via a measurement of the beta-spectrum of gaseous tritium near its endpoint of 18.57 key. An ultra-low background of a few mHz and an energy resolution of 0.93 eV are among the requirements to reach the sensitivity. These demands are fulfilled with the main spectrometer being of the MAC-E filter type and which is equipped with a 650 m(2), two-layered and quasi-massless wire electrode presented in this article. We also report on a recent background related test experiment: the investigation of the possibility to reduce the retarding voltage of the pre-spectrometer in order to diminish a Penning trap leading to increased background.

• 出版日期2011-4