The Arecibo L-Band Feed Array ALFA Front-End Optics
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1 The Arecibo L-Band Feed Array ALFA Front-End Optics Germán Cortés Medellín Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
2 Outline ALFA Specifications Feed Horn Characteristics Antenna Performance Far Field Beam Characteristics Drift-Scan Sampling Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
3 ALFA Specs. Frequency Band to GHz Number of Pixels 7 Return Loss (RL) > 20 db Polarization Linear, Dual Polarization Isolation >20 db Edge Illumination >12 db Gain variation over the band +1/-2 db Horn Aperture Diameter 250 mm Center-to-Center Horn Spacing 260 mm Dewar Rotation ± 100 Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
4 ALFA Receiver System Block (Preliminary Design) Courtesy: Lisa Wray Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
5 TEMPER ATURE TEMPERATURE DATASET MO NITO R MONITOR INTERFACE 4 ANALOG MUX ON OFF +3 2V TXD BUSY PARITY ERROR RESET F93 F25 FRONT DC INTERFACE CSI RO OFF ON OFF CRYODYNE ACTIVE ON PFEIFFER DualGauge PARA MON +2 0V ON OFF LNA 1 2 VACUUM CH SUBRACK DC INTERFACE ON OFF SUPPLY NOISE SOURCE DRIVER Loc/Rem CSIRO TRANSLATOR CAL AUX DRIVE PADDLE COM +20V +9V 20V Test Tone Aux 1 Aux 2 Cal RF Switch Cal RF Switch E 18 20V AUX ALFA Overall Dimensions OOOOO ALFA Top View Side View Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
6 ALFA Focal Plane Layout ALFA Layout in Focal Plane Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
7 Arecibo Gregorian Optics I Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
8 Arecibo Gregorian Optics David Parker 1997, Science photo Library Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
9 Arecibo Gregorian Optics Gregorian Dome Detail Gregorian General View Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
10 Aperture Illumination and Radiation Pattern with feed at Design Phase Center Aperture Illumination Far Field Beam Pattern X U db V -14 db Edge Taper On Tertiary Ellipse 236 x 206 m Area 50 x 50 (1.375 GHz) Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
11 0.0 Arecibo Gregorian Focal Plane Scanning Losses at GHz Scanning Loss [db] Along X-Axis Along Y-Axis 26cm C-C, 2.7cm X-Offset GHz Displacement along X/Y Axis [cm] Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
12 0.0 Arecibo Gregorian Focal Plane Scanning Losses: Other Frequencies Relative Power [db] Xscn, GHz Yscn, GHz Xscn, GHz Yscn, GHz Xscn, GHz Yscn, GHz Xscn, GHz Yscn, GHz Feed Displacement along X/Y axis [wavelengths] Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
13 ALFA: Feed Horn Characteristics Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
14 ALFA: Feed Selection Aeff/Tsys Collaboration: NAIC Cornell with CSIRO More than 7 designs were tried Two Competing Technologies: Coaxial vs. TE11 Mode Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
15 ALFA: Feed Selection Aeff/Tsys 32 Averaged in Frequency 31 10xLog10{Aeff/T [m²/k]} Pixel #0 Average[Pixels>0] 26 Horn 0 Type: Coax cm Coax cm TE cm TE cm TE cm Spacing: x cm x cm x cm x cm x cm Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
16 32 Averaged in Frequency ALFA: Feed Selection Aeff/Tsys 31 10xLog10{Aeff/T [m²/k]} Pixel #0 Average[Pixels>0] Pixel #0 + Noise Skirt Average[Pix>0] + Noise Skirt 26 Horn 0 Type: Coax cm Coax cm TE cm TE cm TE cm Spacing: x cm x cm x cm x cm x cm Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
17 ALFA Feed Horn Characteristics DESIGN: Stepped TE11 Mode Horn 25cm x 26cm DESIGN: CSIRO Horn and OMT Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
18 0 ALFA Feed Horn Characteristics Calculated Return Loss Reflection coefficient [db] Frequency [GHz] CSIRO Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
19 CSIRO TE11 Mode Horn 25 cm x 26 cm Radiation Patterns GHz Amplitude [db] Phase [deg] Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
20 CSIRO TE11 Mode Horn 25 cm x 26 cm Radiation Patterns GHz Amplitude [db] Phase [deg] Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
21 CSIRO TE11 Mode Horn 25 cm x 26 cm Radiation Patterns GHz Amplitude [db] Phase [deg] Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
22 ALFA Antenna Performance Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
23 ALFA Calculated Antenna Sensitivity CSIRO TE11 Mode Horn 25cm x 26cm, 2.7cm X-OffsetX Antenna Sensitivity [K/Jy] GHz GHz GHz Horn Angle [deg] Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
24 ALFA Calculated System Temperature CSIRO TE11 Mode Horn 25cm x 26cm, 2.7cm X-OffsetX Antenna System Temperature [K] Tscatt Trec GHz GHz GHz 4.00 K 8.00 K Horn Angle [deg] Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
25 60 ALFA Calculated G/Tsys CSIRO TE11 Mode Horn 25cm x 26cm, 2.7cm X-OffsetX GHz GHz GHz 10 Log10 [G/T] Horn Angle [deg] Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
26 ALFA Antenna Multi Beam Characteristics Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
27 Far Field Beam Characteristics r ϕ Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
28 Multi Beam Sky Footprint Focal Plane Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
29 Far Field Beam Characteristics Ω Aperture Spacing X- Offset Feed Type TE cm 26.0 cm 2.7 cm Angle Position Position φ FPL HPBW 1 HPBW 2 Ω r SKY φ SKY [arcsec] [arcsec] [deg] [arcsec] [deg] Pix ϕ Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
30 Sky Footprint Pixel # GHz Sky Area 50 x 50 Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
31 Sky Footprint Pixel # GHz Sky Area 50 x 50 Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
32 Sky Footprint Pixel # GHz Sky Area 50 x 50 Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
33 Sky Footprint Pixel # GHz Sky Area 50 x 50 Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
34 Sky Footprint Pixel # GHz Sky Area 50 x 50 Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
35 Sky Footprint Pixel # GHz Sky Area 50 x 50 Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
36 Sky Footprint Pixel # GHz Sky Area 50 x 50 Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
37 Sky Footprint Pixel # GHz Sky Area 50 x 50 Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
38 Total Incoherent Multi Beam Pattern TE11 Mode Horn 25.0 cm x 26.0 cm -3.0 db U -6.9 db -8.5 db -6.7 db -5.9 db Sky Area 25 x 25 Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
39 ALFA Calculated Beam Comatic Level 0-2 SLL -4 Coma SLL [db] Angle [deg] Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
40 ALFA Polarization Characteristics Polarization Probes Orientation in OMT OMT probe positions septum position noise coupler position CISRO OMT Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
41 0-10 ALFA Polarization Characteristics Calculated Cross Polarization GHz GHz GHz Horn Angle [deg] Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
42 ϕ ALFA Drift Scan Sampling Methods ϕ Ideal Circular Path Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
43 ALFA Drift Scan Sampling Methods Error Function ϕ Actual Elliptical Path Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
44 ALFA Drift Scan Sampling Optimum Feed Arm Rotation Angle 6 5 Ideal Circle Footprint Coax 22x23 cm TE11 25 x 26 cm [Σ di-dj /(6xd max)]², {i><j, 1,6} Feed Arm Angle [deg] Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
45 ALFA Drift Scan Sampling Crossover levels at Optimum Feed Arm Rotation Angle 0 TE11 25x26cm -1 Relative Power Level [db] FOV angle [arcsec] Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
46 The End Arecibo L-Band Feed Array G. Cortés, NRAO, Charlottesville,
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