ASTE Status Report
Shin’ichiro Asayama and ASTE team1

Atacama Submillimeter Telescope Experiment (ASTE)••••

10-m sub-mm telescope located at Pampla La Bola
within Chajnantor area
Specifications of telescope:– Surface accuracy: 19um
– Pointing accuracy: 2” rms– Scientific Observing Time: 2,200h/year
Infrastructure:– Diesel generators x 2 (max 150kw – 220V)– Fuel tanks (15,000 L x 2, consumption 300L/d)– Satellite Network (1Mbps)– Weather Station, web cameras, etc
The prime objectives of ASTE operations:– to strength the proposals for the ALMA
– to provide advanced science capabilities for theEast Asian astronomers

ASTEALMA2ASTE Organization

Takeshi Okuda(JAO Sr Instrument Engineerfrom April,2016)

Masumi Yamada

Daisuke Iono

Shin’ichiro Asayama

Yasunori Fujii

The University of Chile,and many Japanese Universities:
The University of Tokyo,
Hokkaido University,
Nagoya University,
Keio University,
Osaka Prefecture University,
Ibaraki University,
The University of ElectroCommunications, andJoetsu University of Education.
3

Science Operation Policy• NAOJ Chile Observatory TAC: 90%– Detailed operation plan discussed at JSAC.
– 2 semesters of call for proposals provided East Asian community (JP,TW, KR) from 2014.
– Guaranteed Time Observation (GTO)
The ASTE consortium contributes to developments of instrumentation on ASTE,commissioning and science verification, and science operations. In return for doingthese contributions, members of the ASTE consortium can apply for GTO.

– Open Use Observations & GTO proposals are evaluated by samereferees.
– Observers remotely conduct their observations from Mitaka, SPdA
facility, and their institutes (for experts).

• Chilean Time (CT) evaluated by CNTAC: 10%4

ASTE InstrumentationReceiver

Type

Freq.
[GHz]

HPBW
[arcsec]

Npix

Npol

StatusCATS345

Heterodyne

324-37222

11

Decommission in2014

DASH345

Heterodyne

324-3722212

Open from 2015

Band8Heterodyne

385-500

1712

Open from 2015

ASTECAM

TES
Bolometer

270

28

169-

350

22271-

Commissioning
from March 2016

Quantization

Bandwidth[MHz]

Nchan

Δf
[MHz]

Status51210240.5

OpenSpectrometer

MAC
WHSF

TypeXF
FX

2-bit
3-bit

128
4096
2048

0.125
4096*

1.00.5

Open from2014b5

Problems
Data acquisition from the WHSF spectrometer had a 1 second delay from the timing• The effect is negligible for Position Switched observation mode (as the integration
time is reduced by 1 second)• The effect can be seen as a shift in source position for OTF mode, and can benoticeable for fast scan patterns.
The problem is currently fixed, but this problem affects all data taken using WHSF,
during the period 2007 to September 27, 2016.
The correct data (with no shift) have been generated by “re-merging” the dataset
The collected data have been delivered to the PIs.
We apologize for any inconvenience that this have caused.

6ASTE Science Operation –Status

ASTE Science Operation - Status
Trend of the Total open use time and the Number of Proposals.

Total time [h]

2012

2013

2014

2015

2016

FY 2016360

63020202152

900

AppliedAccepted

N. of Proposals

70
60

OpenUse

7

650

Joint

64

GTO

1140
30
20

Chile

100
2012

2013
Open Use

2014
Joint

KSP

2015
GTO

2016
Approved

3 (by Chile TAC)ASTE Science Operation - Status
Trends in the number of publications.
• Publication of CATS345, AzTEC data ongoing.
• The number of Band 8QM data is still not enough.
- Need further promotion.
ASTE instruments (2005-2016)

Refereed papers (2005-2016)
14201812161014128106864422002005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
EA Time

Chilean TimeAll ASTE

2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
ASTE230

SC345

CATS345

BAND8QMAzTEC

ASTE Science Operation - Status
Accepted (ABC-rank) ALMA proposals in EA that used ASTE

250.35N. of Proposals

0.25
150.200.15

100.1050.05
00.00
Cycle 1

Cycle 2
NumberCycle 3
Ratio

Cycle 4

The ratio to the total EA proposals

0.3020ASTE Science Operation –2016 Report

ASTE Science Operation - 2016 Report• Science operation– ASTECAM CSV (Mar – Jul)
• CSV plan reviewed by JSAC.

– Open use observations with DASH345/BAND8 (Sep - Dec)
• Total time: 720 hours for open use
12

ASTE Science Operation- 2016 Report•DASH345
BAND8DASH345– 1-pix 345GHz-band RX (2-pol/2SB)• Tsys (DASH345) < Tsys(CATS345)•

ASTE BAND8– Fixed and upgraded BAND8 QM– Operated by ALMA FEMC (NRAO)
350

Pol0-USB

Pol0-LSB

Pol1-USB

Last year

Pol1-LSB300

Trx [K]

250200This year

150
100500310320330

340

350

360

370

380

390

Frequency [GHz]13

ASTE Science Operation - 2016 Report2016 Open Use ：2016 Sep – Dec (available time ~ 900 hours)• Receivers: 345 GHz and 492 GHz heterodyne receivers.
• Spectrometers : MAC (BW[MHz]: 512/128 )/WHSF (BW[MHz]: 4096/2048)

Total Time(except Chileantime)

Details

Open Use(492GHz time shownin parentheses)

Joint

GTO

Chile

# submitted

147 (3)

61

Request time [h]428262 (117)

121

45# accepted

116 (3)413

Accepted time [h]376

241 (117)

90

45

90

Oversubscription

1.3

1.3 (1.0)

1.5

1.0

Note: One polarization observation was offered at 492 GHz receiver due to a malfunction of one of thereceiver.

Medium-term OperationPlan

Medium-term Operation Plan
• Steady-state science operations with ASTE future
instruments• To maximize observing time for EA and Chilean community.
• To enhance synergy with ALMA and other telescopes
including NRO 45m.
• ASTE Development Project to be extendable to ALMA.

16

ASTE Development and Upgrades• To connect ALMA future developments with a long term vision.
ASTEALMA

0.9/1.3 THz receiverBAND11Multi-beam receiver(4-beam BAND7+8)

Multi-beam receiver for TParray

GPU Spectrometer

Spectrometer for TP array• To supplement ALMA• ASTECAM, Polarimeter on ASTECAM• DESHIMA17

Spectroscopic Observations
Blankingplates• New 3-cartridge cryostat– Operate 3 cartridge-type receivers simultaneously.
– Developed by NAOJ ATC– Operated on ASTE from 2017

• Cartridge-type receivers

B8 Receivers were inserted
to fill with 3 receiver ports– New 345GHz-band (modified DASH345)– ASTE BAND8– 0.9/1.3THz-RX (The University of Tokyo)– 230GHz-RX (The University of Electro-Communications)– 1-beam/4-beam BAND7+8 developed by KASI• GPU Spectrometer developed by KASI
Thermal load test cartridgewith sensors and heaters
18

ContinuumObservations• ASTECAM for open use in 2018.
– Under discussion.
• Polarimeter on ASTECAM (A-Pol)• DESHIMA– On-chip imaging spectrographbased on superconducting resonators– developed by TU Delft– operated with ASTECAM– 326-905 GHz w/ R=500– Mapping Submm Universe

19

Operation schedule 2016-19
Mar2016

2019
2020

MayJunJul

ASTECAM(270GHz/350GHz)

AugSepOctNovDecJanFeb

DASH345
BAND8New 345GHz-RX
BAND82017
2018

Apr.

DESHIMA*ASTECAM+DESHIMA/A-Pol*4-beam BAND7+8 (Science Operations)
345 GHz-RX (backup)
(TBD)

Year

Open UseCommissioning

2016

DASH345/BAND8ASTECAM2017

345GHz/BAND8

BAND7+82018*ASTECAM

Full-DESHIMA/A-Pol

2019*4-beam BAN7+8/345GHz

TBD*To be subjected to reviews and be decided for open use
20Summary• The NAOJ Chile Observatory has steadily established thesteady-state science operations of ASTE with the current
capabilities and is planning the operations to maximize
observing time and to save the resources.
• The medium-term operation plan with ASTE future
instruments has been developed.
• ASTE Development and Upgrades to be connect ALMA
future developments with a long term vision.

21

ASTE | T.O. | 16 March 2016

日本天文学会2016年春季年会

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