In pursuit of advancing large array receiver capabilities and enhancing the 16-element Heterodyne Array Receiver Program (HARP) instrument on the James Clerk Maxwell Telescope (JCMT), we have successfully fabricated 230 GHz finline superconductor-insulator-superconductor (SIS) mixers. These mixers are critical for assessing the potential and prospective for the HARP instrument’s upgrade. Unlike the existing HARP’s mixer, we replace the probe antenna with an end-fire unilateral finline as the waveguide to planar circuit transition. This mixer design is expected to operate from about 160–260 GHz (approximately 47% bandwidth), and the mixer chips’ current-voltage (I-V) curves have been characterized, showing promising results with a quality factor (Rsg/Rn) exceeding 9.3. Evaluation of the double-sideband (DSB) receiver noise temperature (Trx) is currently underway. Once successfully characterised, our immediate aim is to scale the mixer to operate at HARP’s frequency range near 345 GHz to achieve similar broad RF bandwidth performance. Ongoing simulations are currently being conducted for the design of the 345 GHz finline mixer. This work marks a crucial step toward enhancing HARP receiver performance with better sensitivity and wider Intermediate Frequency (IF) bandwidth, enabling higher-frequency observations, and expanding the scientific potential of the JCMT and its collaborative partners.
We present the instrument integration and on-sky commissioning results for Kuntur, the LLAMA 690GHz receiver, on loan to the James Clerk Maxwell Telescope (JCMT). The LLAMA 690GHz receiver is a state-of-the-art sideband-separating (2SB), dual polarization receiver, built by the Netherlands Research School for Astronomy (NOVA) laboratory at Groningen, for the Large Latin American Millimeter Array (LLAMA), Argentina. In collaboration with LLAMA, the Institute of Astronomy and Astrophysics, Academia Sinica, Taiwan (ASIAA) and the Greenland Telescope (GLT), the receiver cartridge and WCA have come on loan to JCMT for on-sky commissioning and future VLBI observing tests. The results reveal the potential for single dish observing science at 690GHz with JCMT on Maunakea and provides a pointer to future 690GHz science for both the GLT and LLAMA.
Namakanui is an instrument containing three inserts in an ALMA type Dewar. The three inserts are ‘Ala’ihi, ‘U’ū and ‘Āweoweo operating around 86, 230 and 345GHz. The receiver is being commissioned on the JCMT. It will be used for both Single dish and VLBI observations. We will present commissioning results and the system.
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