- 211 - 272 GHz Single Channel DSB SIS receiver
- The mixer has no response at 252 GHz. This affects the sideband ratios around 252 GHz.
- There is a plan to put in a new mixer to support VLBI observations in the fall. The new mixer have better performance and wider IF bandwith. The tuning range is 211 - 250 GHz (was 211-272 GHz). The lower limit is set by the LO and the upper by the new mixer.
- 325 - 375 GHz 16 Pixel SSB SIS receiver
- 12 of the 16 pixels are operational: H14 and H12 are
dead (H12 as of October 2011). H00 and H10 are also now dead
(as of May 2013).
- Six new mixer block were installed in HARP late
February 2009. These replaced 4 unusable mixers and two
mixers with excessive serial resistance. The replacement
work went very well. However, the pixel H14 is
still unusable due to oscillations. On 20091021 H00, H01 and H02 failed during bias testing. These mixers were replaced the second week of
- Occasional baseline problems
- Sensitivity variations creating striping - worst at 13CO/C18O
|| Not Operational
- Currently warm due to cryogenic issues. Will be kept warm until needed in semester 13B since there are no
observations in the observing queue until then
- Dual channel SIS receiver operating 315-375 GHz (B-band) or 630-710 GHz (D-band).
- The B band is primarily intended for use with the SMA. HARP is in general superior even for single point observations taking RxWB's two channels into account.
- For D band observations SSB is strongly recommended even if DSB mode is possible.
The DSB option has been removed in the latest OT version.
- For D band, channel A is displaced by 10" on the sky from channel B (which is the tracking receptor).
- Only one mixer operational at B-band
- Localized baseline ripple in PSSW mode.
- 850 and 450 micron continuum camera.
- 5120 bolometers (4 sub arrays x 1280 bolometers) at each
- Currently about 3500 bolometers are working at each wavelength band.
- Successfully back in operation after scheduled warm up for cryogenic work (20121029-20121212)
- 16 channel correlator with up to 1.8 GHz bandwidth.
- 183 GHz water vapour monitor installed in receiver cabin.
- Measures the precipitable water vapour along the line of sight at 1.2 second intervals.
- Of the two WVMs available the Silver WVM is currently installed.