INSTITUTO DE ESTRUCTURA DE LA MATERIA

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INSTITUTO DE ESTRUCTURA DE LA MATERIA DPTO FÍSICA MOLECULAR TEST OF THE SEMITRANSPARENT VANE CALIBRATION SCHEME J. Martín-Pintado Design and construction of the device: S. Navarro, M. Carter (IRAM) Implementation : W. Brunswig and A. Sievers (IRAM) Tests: J. Martín-Pintado, J. Cernicharo, J.R. Pardo, A. Rodríguez (IEM-CSIC) 12/5/2018

INSTITUTO DE ESTRUCTURA DE LA MATERIA DPTO FÍSICA MOLECULAR Device Rotary actuator (switch time 1 s) 90 and 230 GHz observations Standard calibration system Position 1 * 1.5 m from the receiver * Orthogonal linear polarizations Position 2 * 10-15 cm from the receiver * No polarization 1 2 12/5/2018

INSTITUTO DE ESTRUCTURA DE LA MATERIA DPTO FÍSICA MOLECULAR Vane material (B.Lazareff and F.Mattiocco, IRAM, June 2001) Polymer foams 1 cm thickness Transmission 0.9 at 100 GHz 12/5/2018

INSTITUTO DE ESTRUCTURA DE LA MATERIA DPTO FÍSICA MOLECULAR Testing the main hypothesis (Position 1) Tvane = f´ * Tamb+(1-f)*TN2 f’=f Measurement of the transmission (1-f) of the S/T vane Continuum sources using beam switching with vane-on and off 0.5% accuracy in 30 s for a 6 Jy source at 100GHz Polarization effects (0.3% ?) Measurement of Tvane Calibrated with N2 and ambient loads Accuracy: <3%: 1.5% saturation of 10% on the ambient load 1.2% for 1 K in the N2 load 1.8% for 0.5% in the transmission coefficient 12/5/2018

INSTITUTO DE ESTRUCTURA DE LA MATERIA DPTO FÍSICA MOLECULAR Effects of standing waves (Position 2) Tilt the semitransparent vane: Measurements of the stable ambient load (bandpass) calibrated with the semitransparent vane-N2 load Accuracy: <3% IF THE MAIN ASUMPTION OF THE S/T VANE CALIBRATION SCHEME IS FULFILL TO BETTER THAN 3%? Comparison of the accuracy of the S/T vane calibration relative to the dual-load and chopper wheel calibration systems 12/5/2018

INSTITUTO DE ESTRUCTURA DE LA MATERIA DPTO FÍSICA MOLECULAR Comparison of calibration schemes (Position 2) Measurements of the intensity of astronomical sources at different elevations calibrated with: Dual-load with atmospheric opacity from ATM+sky emission Semitransparent vane with 2nd order correction ATM+water Chopper wheel with 2nd order correction ATM+water Check the relative accuracy of the three schemes to correct for elevation effects 12/5/2018