PMO (De Ling Ha) 13.7 m millimeter telescope (DeLingHa telescope webpage )

• Location
• Basic facts
• Receivers
• Backends
• Proposal

Location: (back to top)

De Ling Ha observation stating
                Longitude: 97d 33.6m east;
                Lattitude:  37d 22.4m  north;
                Elevation: 3200m above sea level.
Basic facts: (back to top)

Diameter: 13.7 m
Support system: azimuth system (limited to elevation >= 30deg)
Focus: Cassegrain
Surface rms: 70um
Pointing: tracking error = 1.42" (1"~3" for most sky area);
             elevation error = 1.44";
             pointing error = 5"
Beam size: AZ=59"+-9",EL=66"+-8" (@ LO = 112GHz), as a function of wavelength: beam = k * lambda / D.

Efficiencies: eta_Moon = 66.1(+-2.6)%
                  aperture efficiency: eta_A = 25%
                   beam efficiency: eta* = 67% (at zenith), as a function of elevation due to gravity deformation and the change of optical path coupling:
                         eta*(el) = 0.61(+-0.10) - 0.16 (+-0.16) cos(el)   for 12CO line
                         eta*(el) = 0.55(+-0.10) - 0.06 (+-0.14) cos(el)   for 13CO line
Calibration accuracy: Trms = 0.56 K for 60 integration; relative accuracy  = 3.5%.

Receivers: (back to top)

• Single beam: 3mm SiS receiver (85-115 GHz), Trx = 70~123 K (DSB), Tsys = 250 K (112 GHz)
• 3x3 multi-beam: beam separation ~ 200";

       (Note: observe 90 GHz bands during summer and 113 GHz bands during winter.)

Backends: (back to top)

FFTS: bandwidth: 1000, 500, 250, 200 MHz bandwidths, 16384 channels; Band Width Channel Width (theory) Channel Width (measured) Notes 200 MHz 12.2 kHz 12.2 kHz 基带变换1000 MHz 250 MHz 15.3 kHz 15.3 kHz 1000 MHz 61.0 kHz 61.0 kHz 500 MHz 30.5 kHz 30.5 kHz 基带变换500 MHz

AOS: 3-line system(12CO, 13CO, C18O, 1-0). See below: Backends Bandwidth(MHz) Central freq. (MHz) Channels Channel Width(KHz) Frequency Resolution(KHz) AOS-I(13CO) (110.201353 GHz) 42.691 70.01294 1024 41.73 79.3±2.5 AOS-II(C18O) (109.782183 GHz) 43.077 70.00898 1024 42.13 80.7±4.2 AOS-III(12CO) (115.271204 GHz) 145.337 225.4101 1024 142.06 212.7±5.9 The measured antenna temperature is T_A*, after the correction of atmospheric absorption and Omic loss.

Observation modes: beam switch, position switch, grid mapping, on-the-fly (OTF) mapping, sky dip.

Proposal: (back to top)