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Dynamic tunable notch filters for the Antarctic Impulsive Transient Antenna (ANITA)

2018; Elsevier BV; Volume: 894; Linguagem: Inglês

10.1016/j.nima.2018.03.059

1872-9576

P. Allison, O. Banerjee, J. J. Beatty, A. Connolly, C. Deaconu, J. Gordon, P. W. Gorham, Michael Kovacevich, C. Miki, E. Oberla, Jason L. Roberts, Björn Rotter, S. Stafford, K. Tatem, L. Batten, K. Belov, D. Besson, W. R. Binns, V. Bugaev, Pinlu Cao, C. Chen, P. Chen, Y. Chen, J. Clem, L. Cremonesi, B. Dailey, P. F. Dowkontt, Shih‐Ying Hsu, J. Huang, R. Hupe, M. H. Israel, J. Kowalski, J. Lam, J. G. Learned, K. M. Liewer, Taiyuan Liu, Andrew Ludwig, S. Matsuno, Katharine Mulrey, J. W. Nam, R. J. Nichol, A. Novikov, S. Prohira, B. F. Rauch, J. Řípa, A. Romero‐Wolf, John W. Russell, D. Saltzberg, D. Seckel, Jen‐Chieh Shiao, J. Stockham, M. Stockham, B. Strutt, G.S. Varner, A. G. Vieregg, S. Wang, Stephanie Wissel, Fan Wu, R. Young,

Gyrotron and Vacuum Electronics Research

The Antarctic Impulsive Transient Antenna (ANITA) is a NASA long-duration balloon experiment with the primary goal of detecting ultra-high-energy (>1018eV) neutrinos via the Askaryan Effect. The fourth ANITA mission, ANITA-IV, recently flew from Dec 2 to Dec 29, 2016. For the first time, the Tunable Universal Filter Frontend (TUFF) boards were deployed for mitigation of narrow-band, anthropogenic noise with tunable, switchable notch filters. The TUFF boards also performed second-stage amplification by approximately 45 dB to boost the ∼μV-level radio frequency (RF) signals to ∼ mV-level for digitization, and supplied power via bias tees to the first-stage, antenna-mounted amplifiers. The other major change in signal processing in ANITA-IV is the resurrection of the 90° hybrids deployed previously in ANITA-I, in the trigger system, although in this paper we focus on the TUFF boards. During the ANITA-IV mission, the TUFF boards were successfully operated throughout the flight. They contributed to a factor of 2.8 higher total instrument livetime on average in ANITA-IV compared to ANITA-III due to reduction of narrow-band, anthropogenic noise before a trigger decision is made.