Current Status of Nobeyama 4545‐mmTelescopep
Masao Saito
Nobeyama Radio Observatory45‐m45m antenna• 45m Diameter• Beam waveguide optics• Pointing accuracy: 2‐3”
(under decent conditions)• Receivers (20 – 116 GHz)
• Digital/VLBI/
Backend• Open sky policy

Oct3‐4, 2016

Mizusawa Users Meeting2Current System

OPEN USE
Commissioning

Antenna

Optics

ReceiverIF chain

H22

Backend
Continuum BE

H4045mZ45
Switch

T70
TZ

SAM45

PolariS
New IFFOREST
Oct3‐4, 2016

Mizusawa Users Meeting

VLBI BE3

Performance improved• Large surface errors: 180 m (A,110 GHz :0.25)– Improved
pto be 100 m (A,110A 110 GHz :0.35))• High antenna noise temperature: 30 K
– ReducedR d d to b
be 19 K (w/o( / atmosphere)h )• Single
g p
pixel Rx onlyy at 3 mm
– Expanded to be 4 pixels
Overallnearlya factorstructureof 10 improvement in 3 mm mapping• Ruston mount– Painting mount structureOct3‐4, 2016

Mizusawa Users Meeting4

Oct3‐4, 2016

Mizusawa Users Meeting5

Put (Stick) metal foils to M2 and M3• Put (Stick) metal foils to M2 and M3 (3 um thick)• Tsys is reduced by ~ 11K @ 3mm
Oct3‐4, 2016

Mizusawa Users Meeting

6

Painting white
Different thermal behavior?

Oct3‐4, 2016

Mizusawa Users Meeting

7

FUGIN (GPS)Columbia Survey in CO(1-0)
1°b0°

-1°

UmemotoOct3‐4, 2016 et al.

lMizusawa Users Meeting8

Future Development• Near Future Developmentp– Analysis ported to CASA (Pipeline)– Archive System– Remote observations– VLBI at 86 GHz– Z45/Polaris capability• FutureFDevelopment
D l– Metrology System– FOREST with wider frequency coverage– More advanced spectrometersp(bandwidth/bits)(/ )Oct3‐4, 2016

Mizusawa Users Meeting

9Metrology goal
Push wind limit further from 3 to 5 m/s by meterology
GoallG
Very goodCurrent
Very good

Oct3‐4, 2016

Mizusawa Users Meeting

10

LED

Measurement Setup
KKuno
2006

Sep. 19‐24, 2016

Metrology and Control of Large Telescopes

OPT+CCD

11

YX

Left

Y
X
Bottom
Sep. 19‐24, 2016

Metrology and Control of Large Telescopes

12Pointing error and dish movement
Azimuth/Elevation

20”

Top X [Pi[Pixel]
el]Sep. 19‐24, 2016

天X ｖｓ ｄAZ
dEEl [arcssec]

Good correlation seen (sometimes)

KKuno
2006

Metrology and Control of Large Telescopes

2020”

Leftf X [Pixel][]
13

Wind Metrology• Update the previous wind metrology system– Set more stable LED mount structure– Enclosure around LET to avoid unwanted sunlight– Simplify pointing telescopes• Jupiter or Venus observations with FOREST yields
accurate pointing errors in both Az/El to confirm
metrology performance.
• Large Aperture Metrology Project was proposedin the metrology/control WS in Sep2016.
Oct3‐4, 2016

Mizusawa Users Meeting14

45 m telescope and VLBI
45‐m
• Open‐skyO
k policyli – observing
bi proposals
l fromfVLBIcommunity are welcome.
• Observing Time– Currently up to 100 hrs per season– Possible to increase: Science Does Matter
Matter.

• Remote Observations from Mizusawa is possible,
but needs to be validated.
validated• NRO provide infrastructure and interface
information for outside groups if highly evaluatedby JSAC.
Oct3‐4, 2016

Mizusawa Users Meeting15

Toward successful VLBI Obs.
Obs• Do
D we hhave a consistenti t t andd efficiently
ffi i tl planl tto
use Nobeyama 45‐m as a VLBI element?
• Organization– Mizusawa, KASI, others?

• System‐wiseSystem wise
– System Design and Requirements• Commissioning– Commissioning plan/manpower• Operation/Maintenance Plan
– With KaVA, VERA, EVN These are key issues for success!
Oct3‐4, 2016

Mizusawa Users Meeting16Summary• Nobeyama 45‐m
45 m telescope (34 yrs old)
– One of the largest single dish antennas operated at
20 116 GHz.
20‐116GH• Performance has been significantlygy enhanced at
3 mm will be further improved.
• Nobeyama 45‐m45 m telescope has high potential toconduct VLBI observations at 43 GHz and higher..

Oct3‐4, 2016

Mizusawa Users Meeting17