ARRAY CONFIGURATION AND TOTAL POWER CALIBRATION FOR LEDA
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1 ARRAY CONFIGURATION AND TOTAL POWER CALIBRATION FOR LEDA Frank Schinzel & Joe Craig (UNM) on behalf of the LEDA Collaboration USNC-URSI National Radio Science Meeting Boulder,
2 What is LEDA? Experiment focusing on the detection of the dark ages signal from the Lyα coupling era (z~20) Challenges: Greater diffuse structure in sky brightness A weak line against bright continuum Calibration and sky mapping Approach: Use individual outrigger cross-dipoles to measure sky total power Construct large-n FPGA/GPU correlator for sky-mapping PI: Lincoln Greenhill (CfA) Dan Werthimer (Berkeley) Greg Taylor (UNM) Steve Ellingson (VT) LEDA (Schinzel) Boulder,
3 First Station of the Long Wavelength Array LWA1 Technical Specifications: 5-88 MHz usable Galactic noise-dominated (>4:1) MHz 4 independent beams x 2 pol. x 2 tunings each 19.6 MHz bandwidth SEFD 3 kjy (zenith); Smin 5 Jy (5, 1 s, 16 MHz zenith) All sky (all dipoles) modes: TBN (70 khz-bw; continuous) TBW (78 MHz-bw, 61 ms burst) See also presentations by Steve Ellingson Friday afternoon: SEARCHING FOR SHORT DISPERSED PULSES WITH LWA1 (J3-11) ELECTROMAGNETIC CHARACTERIZATION OF THE LWA1 ANTENNA ARRAY (BJ1-3) LEDA (Schinzel) Boulder,
4 Array Configuration Science Array - measure total power - 5 outrigger (cross-dipoles) Calibration Array LWA1 dipoles - Sky mapping (w/ science array) LEDA Concept Correlator & Post-processing FPGA/GPU based large-n correlator (512 inputs) w/ pulsar gating Full correlation backend Warped snapshot calibration/imaging LEDA (Schinzel) Boulder,
5 LEDA Correlator First 32 input prototype operational at LWA1 (first light wide-field map around Cyg A). Kocz, Bernardi et al. (CfA) LEDA 64 expected to deploy over the next few months at LWA1. LEDA (Schinzel) Boulder,
6 Constraints for LWA1 National Elevation Dataset Placement of additional outrigger around LWA1 is constrained: Required to stay within NRAO owned land Minimize mutual coupling effects (nearby structures) Interference from overhead powerlines and VLA operations Co-planarity with LWA1 (<1-5 m) LEDA (Schinzel) Boulder,
7 Array Configuration Study For sparse arrays, following the legs of a Reuleaux triangle is a good choice (Keto 1997) Tested configurations with 2-5 outriggers: Triangle Diameter 450 m Two elements per leg One leg across LWA1 Max. Baseline ~510m LEDA (Schinzel) Boulder,
8 Construction of 4 LWA1 built configuration #3 Cabling: 2x LMR400 1x DC power 1x 6 strand single-mode fiber #2 #4 #5 #1 LEDA (Schinzel) Boulder,
9 LEDA OVRO LWA type station under construction at Caltech Owens Valley Radio Observatory. Station footprint increased by a factor of 2 & 5 outrigger in half circle config. Antenna locations and elevation contours (u,v) snapshot coverage LEDA (Schinzel) Boulder,
10 LEDA Antenna Front Ends New FEEs w/ three state switching to calibrate T sky : Antenna (P A ) Load (P L ) Noise (P C ) J. Craig et al. (UNM) LEDA requires absolute power measurements from multiple outriggers. The ability to calibrate these outriggers are implemented through newly designed front end electronics (FEEs). Requires a priori knowledge of T C and T L which will be determined in the Lab. All remaining parameters are determined in the field during data acquisition. LEDA (Schinzel) Boulder,
11 Comparitor circuit Front End Circuit 4:1 Balun Switch 25 db Amp Filter 12 db Amp Temp. stab. attenuator & noise diode Specifications: LEDA FEE Gain 37 db NF 29 db IP 3-2 dbm State Selection w/ Bias DC: BiasDC Position 15 V Antenna 16 V Load 17 V Noise & Load LEDA (Schinzel) Boulder,
12 Lab Setup 8192 channels/100 ms LEDA (Schinzel) Boulder,
13 Switching States Total Power vs Time Pre level detection Power Spectral Densities Post level detection Sample clock/pps not locked: level detection, clock drift correction applied 25 MHz bandwidth (23.9 khz/channel), Integration time: 200 s each state weak interference below 55 MHz LEDA (Schinzel) Boulder,
14 Calibrated Antenna Temperatures Calibrated T sys after bandpass removal Calibrated dynamic spectrum Noise level ~1 K LEDA (Schinzel) Boulder,
15 Summary Completed deployment of four additional LWA1 providing additional baselines ranging from m Developed new front end electronics to be outrigger Demonstrated three state switching total power calibration scheme with achieved T sys stability of ~1 K Deep integrations & field testing in 1 st quarter of 2013 together w/ deployment of LEDA 64 channel LWA1 LEDA developments are important for ongoing and future experiments targeting EoR and dark ages science stay tuned! LEDA (Schinzel) Boulder,
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