FOREST and Future Development of the Nobeyama 45-m Telescope - - PowerPoint PPT Presentation

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FOREST and Future Development of the Nobeyama 45-m Telescope - - PowerPoint PPT Presentation

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FOREST and Future Development of the Nobeyama 45-m Telescope Tetsuhiro MINAMIDANI Nobeyama Radio Observatory NaConal Astronomical Observatory of Japan Outline FOREST Season 2015-2016 PreparaCons for Season 2016+ Future Development

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SLIDE 1

FOREST and Future Development of the Nobeyama 45-m Telescope

Tetsuhiro MINAMIDANI

Nobeyama Radio Observatory NaConal Astronomical Observatory of Japan

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SLIDE 2

Outline

  • FOREST

– Season 2015-2016 – PreparaCons for Season 2016+

  • Future Development of the Nobeyama 45-m

Telescope

– post FOREST

  • March. 07, 2016

RX Workshop 2015 (Minamidani) 2

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SLIDE 3

Nobeyama 45-m Telescope

  • Diameter: 45m
  • Surface accuracy: 100um

rms

  • 9 Receivers
  • Frequency coverage: 20 –

116GHz

  • Beam size: 15” @ 115GHz
  • PoinCng accuracy: ~ 3”
  • Main beam efficiency: ~

0.41 @ 115GHz

  • Aperture efficiency: ~

0.36 @ 115GHz

  • March. 07, 2016

RX Workshop 2015 (Minamidani)

Nobeyama Radio Observatory (NRO)

3

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SLIDE 4

Current System

  • March. 07, 2016

RX Workshop 2015 (Minamidani) 4

Antenna OpCcs

H22 H40 S40 Z45 T70 S80 S100 TZ FOREST Old IF New IF AOS ConCnuum BE SAM45 VLBI BE PolariS

Receiver IF chain Backend

45m Switch OPEN USE Internal Use Commissioning ROACH

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SLIDE 5

“FOREST”

FOur beam REceiver System on 45-m Telescope

  • 4-beam x 2-pol.(H/V) x 2-sideband = 16 IFs
  • Beam separaCon ~ 50”
  • Beam size ~ 15” @ 115GHz
  • IF: 4-12 (4-11) GHz è simultaneous 12CO, 13CO,

C18O observaCon

  • Dewar rotaCon system to track same sky posiCon
  • March. 07, 2016

RX Workshop 2015 (Minamidani) 5

(Minamidani et al. in prep.)

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SLIDE 6

FOREST

FOur beam REceiver System on 45m-Telescope

  • 4-beam x 2 pol. x 2SB = 16IF
  • Beam separaCon ~ 50”
  • IF 4 – 12 (4-11) GHz

Receiver BEARS TZ FOREST # of Beams 25 2 (1) 4 Sidebands DSB 2SB 2SB PolarizaCon Single Dual Dual IF freq. [GHz] 2 – 2.6 4 – 8 4 – 12 (11) Trx (SSB) [K] ~ 160 ~ 50 ~50 Tsys (SSB) [K] ~ 600 ~ 200 ~ 200 Mapping Eff. 1 0.72 2.9

  • March. 07, 2016

RX Workshop 2015 (Minamidani) 6

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SLIDE 7

Season 2015-2016

  • Updates:

– Co-axial IF cables in Dewar: Replaced

  • “Dip” is disappeared

– CLAN Bias circuit: Replaced – IF chains: Tuned – Control System: Replaced

  • Timeline:

– Oct. 13: Installed to the 45-m Telescope – Set-up, Commissioning – Dec. 22: Started Legacy ObservaCons – Jan. 06: Started Open Use ObservaCons

  • March. 07, 2016

RX Workshop 2015 (Minamidani) 7

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SLIDE 8

Season 2015-2016

  • Status:

– 45-m Status Report

  • hqp://www.nro.nao.ac.jp/~nro45mrt/html/prop/

status/Status_R15.html

– FOREST wiki CSV

  • hqps://www.nro.nao.ac.jp/~nro-devel/secure/wiki/

forest/index.php?FOREST%2FDevelopment%2FCSV

  • （要 ID/password）

– Tsys

  • 250 K @ 12CO (~ 115GHz)
  • 150 K @ 13CO, C18O (~ 110GHz)

– IRR ~ 10 dB

  • March. 07, 2016

RX Workshop 2015 (Minamidani) 8

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SLIDE 9

TZ FOREST H V

beam1 beam2 beam3 beam4 beam1 beam2 beam3 beam4

5 10 15 20 25 30 109 110 111 112 113 114 115 116 117 100 200 300 400 500 600 700 800 IRR (dB) Tsys (K) RF (GHz) 201503071153-TZ1H-USB-110G+115G IRR Tsys 5 10 15 20 25 30 109 110 111 112 113 114 115 116 117 100 200 300 400 500 600 700 800 IRR (dB) Tsys (K) RF (GHz) 201503071153-TZ1V-USB-110G+115G IRR Tsys

Tsys / IRR

青：Tsys 黒：IRR

  • March. 07, 2016

RX Workshop 2015 (Minamidani) 9

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SLIDE 10

Beam Map

  • March. 07, 2016

RX Workshop 2015 (Minamidani) 10

Beam size ~ 19” @ 86GHz SeparaCon ~ 50” Beam1 Beam2 Beam3 Beam4

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SLIDE 11

Season 2015-2016

  • Issues on Cooling System

– He gas leak

  • He lines between compressor and cold-head ?
  • Charge He gas every week / every two weeks

– Temperature fluctuaCon

  • depend on combinaCons of compressor and cold-head ?
  • Temperature fluctuaCon is not so large (50-100mK), but…
  • Affected to IF signal level and spectral baseline
  • March. 07, 2016

RX Workshop 2015 (Minamidani) 11

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SLIDE 12

Test ObservaCon

  • March. 07, 2016

RX Workshop 2015 (Minamidani) 12

12CO 13CO C18O 1 deg x 1deg x 2 regions ~ 5 hours (Minamidani, FOREST CSV Team et al. in prep.) Orion A Horsehead Nebula

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SLIDE 13

PreparaCons for Season 2016+

  • Development of Wideband SIS Mixers @ ATC

– OKY100 (Kozuki et al. ) – Replace SIS Mixers next summer

  • Replace to 67-116GHz SIS Mixers ?!
  • March. 07, 2016

RX Workshop 2015 (Minamidani) 13

４ ６ ８ １０ １２ １４

IF Frequency [GHz]）

２００ １５０ １００ ５０ ０ TRX（DSB） 【K】） ２００ １５０ １００ ５０ ０ TRX（DSB） 【K】）

IF Frequency [GHz]

４ ６ ８ １０ １２ １４

@fLO=100GHz @fLO=100GHz 雑音温度 20[K] 20[K]

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SLIDE 14

Future Development of the Nobeyama 45-m Telescope

  • Diameter: 45m
  • Surface accuracy: 100um

rms

  • 9 Receivers
  • Frequency coverage: 20 –

116GHz

  • Beam size: 15” @ 115GHz
  • PoinCng accuracy: ~ 3”
  • Main beam efficiency: ~

0.41 @ 115GHz

  • Aperture efficiency: ~

0.36 @ 115GHz

  • March. 07, 2016

RX Workshop 2015 (Minamidani)

Nobeyama Radio Observatory (NRO)

14

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SLIDE 15

Current System

  • March. 07, 2016

RX Workshop 2015 (Minamidani) 15

Antenna OpCcs

H22 H40 S40 Z45 T70 S80 S100 TZ FOREST Old IF New IF AOS ConCnuum BE SAM45 VLBI BE PolariS

Receiver IF chain Backend

45m Switch OPEN USE Internal Use Commissioning ROACH

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SLIDE 16

Recent Issues & AcCons

  • Antenna

– Replacing sub-ref. servo system (FY2015 done) – Surface adjustment (FY2015 done)

  • OpCcs

– Put (SCck) metal foils to M2 and M3 (FY2015 done) – Replace mirror switching, chopper wheel mechanisms (FY2015 - 2017)

  • Receiver – IF - Backend

– So many frontends è Decommissioning of S40, S80, S100, TZ

  • S40: Low demand(?) / Replace H40/Z45 CLNA to wider one?
  • S80/S100: A{er checking consistency among 3mm RXs (FY2015-2016)
  • TZ: FOREST covers TZ capability (Deep integraCon, ON-ON mode) (FY2015-2016)

– Commissioning of Z45 to open to community (Season2015-2016) – Decommissioning of Old IF system

  • Check consistency between AOS and SAM45 (Season2015-2016)
  • New/Relocate ConCnuum Backend (FY2015 - 2016)

– Applying 3-bit linearity correcCon to OCTAD-A + SAM45 spectrometer (FY2015) – Commissioning of SAM45 spectral window mode (Season2015-2016) – Commissioning of ROACH spectrometer (Season2015-2016)

  • Monitor & Control

– Expand remote observaCon – Metrology system

  • March. 07, 2016

RX Workshop 2015 (Minamidani) 16

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SLIDE 17

Near Future System

  • March. 07, 2016

RX Workshop 2015 (Minamidani) 17

Antenna OpCcs

H22 H40 Z45 T70 FOREST New IF ConCnuum BE SAM45 VLBI BE PolariS

Receiver IF chain Backend

45m Switch OPEN USE Internal Use Commissioning ROACH

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SLIDE 18

Future Development

  • OpCons/Candidates:

– More beams (pixels) ?

  • Heterodyne Array ?

– More spectrometers (bandwidth) ?

  • ROACH (FPGA) spectrometer ?
  • GPU spectrometer (e.g., KASI developing ) ?

– ConCnuum Camera ?? – VLBI at millimeter wavelengths ?

  • CooperaCon with other projects and/or

universiCes is essenCal.

  • March. 07, 2016

RX Workshop 2015 (Minamidani) 18

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SLIDE 19

Summary

  • FOREST

– Performance is improved – Provided to Open Use ObservaCon

  • Future Developments of the Nobeyama 45-m Telescope

– Nobeyama 45-m Telescope: One of the largest radio telescope which covering 20 – 115GHz. – On-going/planned updates will be finished in coming 2-3 years

  • These will improve observing efficiency by factor ~ 7

– OpCons/Candidates:

  • More beams (pixels) ?
  • More spectrometers (bandwidth) ?
  • ConCnuum Camera ??
  • VLBI in millimeter wavelengths ?
  • etc. ?

– Highly depend on the demands from community. – CompeCCve ? – CooperaCon with universiCes and/or other projects in NAOJ is essenCal.

  • March. 07, 2016

RX Workshop 2015 (Minamidani) 19