Recent and Future Development of the Nobeyama 45-m Telescope Tetsuhiro MINAMIDANI (Nobeyama Radio Observatory)
Outline • Recent Issues & Actions • Current System of Nobeyama 45-m Telescope • On-going activities • Future Development – Community-Driven / Test for future development – NRO Driven • Summary Dec. 26-27, 2018 | TM | Recent and Future Development of the ALMA/45m/ASTE Users 2 Nobeyama 45-m Telescope Meeting 2018
Outline • Recent Issues & Actions • Current System of Nobeyama 45-m Telescope • On-going activities • Future Development – Community-Driven / Test for future development – NRO Driven • Summary Dec. 26-27, 2018 | TM | Recent and Future Development of the ALMA/45m/ASTE Users 3 Nobeyama 45-m Telescope Meeting 2018
Issues of the Last Season (1/2) • Sub-ref. Z2 Driving System – Season2017-2018 • Frequently stuck in the early phase (= commissioning phase) • Recovered by warming up the cylinder tentatively. • Monitor and alert features were implemented. • No serious troubles during the Open-Use Observations – FY2018 • Recovered with MELCO – Season 2018-2019 • No troubles until now • Regular check and preventive maintenance works (grease-up etc.) is scheduled every two months. Dec. 26-27, 2018 | TM | Recent and Future Development of the ALMA/45m/ASTE Users 4 Nobeyama 45-m Telescope Meeting 2018
Issues of the Last Season (2/2) • FOREST Receiver – Season 2017-2018 • Dewar temperature was raised and unstable from April… – FY2018 • Added additional compressor. • Two compressors are used for the FOREST receiver. – Season 2018-2019 • Quite stable temperature. • Planned warm-up and cooling-down is scheduled in the end of March Dec. 26-27, 2018 | TM | Recent and Future Development of the ALMA/45m/ASTE Users 5 Nobeyama 45-m Telescope Meeting 2018
Recent Issues & Actions (FY2014 -) • Antenna – Replacing sub-ref. servo system (FY2015 done) Surface adjustment (FY2015 done) – Blue: Done • Optics Green: Done (updated) – Put (Stick) metal foils to M2 and M3 (FY2015 done) Red: on-going Replace chopper wheel mechanism (FY2016 done) – – Replace beam switching mechanism (FY2017-2018) Replace mirror switching controller (FY2017-2018) : Done in FY2018 – • Receiver – IF - Backend – So many frontends è Decommissioning of S40, S80, S100, TZ Commissioning of Z45 (Season2015-2016) è Open to Community Season 2016-2017 – Decommissioning of Old IF system – Relocate Continuum Backend (FY2015 - 2016) • – Commissioning of SAM45 spectral window mode (Season2015-2016) è Open to Community Season 2016-2017 Monitor & Control • Expand remote observation: Hokkaido, Nagoya, Kagoshima, ASIAA, KASI – – Metrology system (Wind / Thermal) Observing/Reduction/Analysis Softwares • New programs for generating observing script (nobs): updating – – Toward CASA Dec. 26-27, 2018 | TM | Recent and Future Development of the ALMA/45m/ASTE Users 6 Nobeyama 45-m Telescope Meeting 2018
Replace mirror switching controller • Switching: x3 faster • User interface is updated. – Switching buttons (GUI) are also available on COSMOS machine. Dec. 26-27, 2018 | TM | Recent and Future Development of the ALMA/45m/ASTE Users 7 Nobeyama 45-m Telescope Meeting 2018
New programs for generating observing script (nobs): updating https://www.nro.nao.ac.jp/~nro45mrt/html/obs/nobs/index.html • Line • Continuum • zobs and obs – NOT updated. – will be obsoleted. Dec. 26-27, 2018 | TM | Recent and Future Development of the ALMA/45m/ASTE Users 8 Nobeyama 45-m Telescope Meeting 2018
Other Activities toward Simple and Stable Operation • Reducing the number of synthesizers for 1 st LO – One synthesizer is shared with H40 and Z45 receivers. • FOREST – CLNA Bias circuit was replaced for monitoring and controlling. – Some monitors were added. • Distribution of 10 MHz reference signal in the receiver cabin was updated. • Replacement of Computers – # of servers for COSMOS (Control System): 10 à 1 !! Dec. 26-27, 2018 | TM | Recent and Future Development of the ALMA/45m/ASTE Users 9 Nobeyama 45-m Telescope Meeting 2018
Outline • Recent Issues & Actions • Current System of Nobeyama 45-m Telescope • On-going activities • Future Development – Community-Driven / Test for future development – NRO Driven • Summary Dec. 26-27, 2018 | TM | Recent and Future Development of the ALMA/45m/ASTE Users 10 Nobeyama 45-m Telescope Meeting 2018
Nobeyama 45-m Telescope https://www.nro.nao.ac.jp/~nro45mrt/html/index-e.html • Diameter: 45m Nobeyama Radio Observatory (NRO) • Surface accuracy: 100um rms • 5 Receivers • Frequency coverage: 20 – 116GHz • Beam size: 15” @ 115GHz • Pointing accuracy: ~ 3” • Main beam efficiency: ~ 0.45 @ 115GHz • Aperture efficiency: ~ 0.36 @ 115GHz Dec. 26-27, 2018 | TM | Recent and Future Development of the ALMA/45m/ASTE Users 11 Nobeyama 45-m Telescope Meeting 2018
2018-2019 System OPEN USE Internal Use Commissioning Antenna Optics Receiver IF chain Backend H22 Old IF Continuum BE H40 45m Z45 VLBI BE T70 Switch PolariH New VLBI BE (HINOTORI project) SAM45 New IF FOREST Dec. 26-27, 2018 | TM | Recent and Future Development of the ALMA/45m/ASTE Users 12 Nobeyama 45-m Telescope Meeting 2018
Receivers H22 H40 Z45 T70 FOREST OPEN USE OPEN USE OPEN USE OPEN USE OPEN USE # of 1 1 1 1 4 Beams Polarizatio RHCP/LHCP LHCP H/V H/V H/V n Rx.type HEMT HEMT HEMT SIS (2SB) SIS (2SB) RF 20-25 42-44 42-46 71 - 92 80 - 116 freq.[GHz] IF 5-7 5-7 4-8 4-8 4-12 B.W[GHz] 2 2 4 4 8 Tsys[K] 100 250 100 120 - 270 150 - 300 IF chain Old/New Old/New Old/new New Old/New Continuu OPEN USE Internal OPEN USE Internal OPEN USE m BE VLBI BE x x � � � Dec. 26-27, 2018 | TM | (2018B- ) H22 and H40 can be used simultaneously with a perforated filter. Recent and Future Development of the ALMA/45m/ASTE Users 13 Nobeyama 45-m Telescope Meeting 2018
Backend (Single dish) OCTAD-A Cont. BE + SAM45 OPEN USE OPEN USE Type F-FX type Detector correlator AD IF chain New Old # of Array 16 2 (6) # of ch / array 4096 - Freq. 2000 (1600 eff) / 2000 Coverage 1000 / 500 / 250 / (BW) (MHz) 125 / 63 / 31 / 16 Freq. ~ BW / 4096 x 2 - Resolution (kHz) Channel BW / 4096 - separation (kHz) Dec. 26-27, 2018 | TM | Recent and Future Development of the 14 ALMA/45m/ASTE Users Nobeyama 45-m Telescope Meeting 2018
Outline • Recent Issues & Actions • Current System of Nobeyama 45-m Telescope • On-going activities • Future Development – Community-Driven / Test for future development – NRO Driven • Summary Dec. 26-27, 2018 | TM | Recent and Future Development of the ALMA/45m/ASTE Users 15 Nobeyama 45-m Telescope Meeting 2018
On-going Activities Replace beam switching mechanism • Design phase (with simple test) – Decommissioning of Old IF system: Relocate Continuum Backend • Implementation will be done in FY2019 – Metrology system (Wind / Thermal) • Study phase – Measurements of level differences among the main-dish panels • K-GPU spectrometer • Auto-pointing • API for online data loading is preparing – Design and tests of the Auto-pointing algorithm is on-going. – Telescope test for low-frequency observation is planned in the Season 2018-2019. – Queue observations • COSMOS was updated (JSON-based web API; ~2017) – Python-based queue system is under development (will be tested in the Season 2018- – 2019). Data reduction with CASA • Dec. 26-27, 2018 | TM | Recent and Future Development of the ALMA/45m/ASTE Users 16 Nobeyama 45-m Telescope Meeting 2018
First Spectra with 45-m Telescope (Dec. 25, 2017) SiO (v=2, J=1-0) @ 42.8GHz SiO (v=1, J=1-0) @ 43.1GHz K-GPU Spectrometer SAM45 Dec. 26-27, 2018 | TM | Recent and Future Development of the ALMA/45m/ASTE Users 17 Nobeyama 45-m Telescope Meeting 2018
On-going Activities Replace beam switching mechanism • Design phase (with simple test) – Decommissioning of Old IF system: Relocate Continuum Backend • Implementation will be done in FY2019 – Metrology system (Wind / Thermal) • Study phase – Measurements of level differences among the main-dish panels • K-GPU spectrometer • Auto-pointing • API for online data loading is preparing – Design and tests of the Auto-pointing algorithm is on-going. – Telescope test for low-frequency observation is planned in the Season 2018-2019. – Queue observations • COSMOS was updated (JSON-based web API; ~2017) – Python-based queue system is under development (will be tested in the Season 2018- – 2019). Data reduction with CASA • Dec. 26-27, 2018 | TM | Recent and Future Development of the ALMA/45m/ASTE Users 18 Nobeyama 45-m Telescope Meeting 2018
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