19 July 2016 The QUIJOTE TGI control system
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Abstract
The QUIJOTE-CMB experiment (Q-U-I JOint TEnerife CMB experiment) has been described in previous publications. In particular, the architecture of the MFI instrument control system, the first of the three QUIJOTE instruments, was presented in [1]. In this paper we describe the control system architecture, hardware, and software, of the second QUIJOTE instrument, the TGI (Thirty GHz Instrument), which has been in the process of commissioning for a few weeks now. It is a 30 pixel 26-36 GHz polarimeter array mounted at the focus of the second QUIJOTE telescope. The polarimeter design is based on the QUIET polarimeter scheme, implementing phase switches of 90° and 180° to generate four states of polarisation. The TGI control system acquires the scientific signal of the four channels for each of the 30 polarimeters, sampled at 160 kHz; it controls the commutation of the 30 x 4 phase switches at 16 kHz or 8 kHz; it performs the acquisition and monitoring of the health of the complete instrument, acquiring housekeeping from the various subsystems and also controls the different operational modes of the telescope. It finally, implements a queue system that permits automation of the observations by allowing the programming of several days of observations with the minimum of human intervention. The acquisition system is based on a PXI-RT host from NI, the commutations of the phase switches are performed by a PXI-FPGA subsystem and the telescope control is based on an EtherCAT bus from Beckhoff.
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M. F. Gómez-Reñasco, M. F. Gómez-Reñasco, Y. Martín, Y. Martín, M. Aguiar-González, M. Aguiar-González, J. Cozar, J. Cozar, N. González-Cobos, N. González-Cobos, R. Hoyland, R. Hoyland, M. Núñez Cagical, M. Núñez Cagical, M. R. Pérez-de-Taoro, M. R. Pérez-de-Taoro, V. Sánchez-de la Rosa, V. Sánchez-de la Rosa, A. Vega-Moreno, A. Vega-Moreno, T. Viera-Curbelo, T. Viera-Curbelo, } "The QUIJOTE TGI control system", Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 991432 (19 July 2016); doi: 10.1117/12.2232871; https://doi.org/10.1117/12.2232871
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