kvn/kava/eavn현황 · 2020. 8. 12. · •4 adc (4 x 16gsps) • input freq. 8 -16ghz • digital...
TRANSCRIPT
KVN/KaVA/EAVN 현황
Taehyun Jung (KASI)
On behalf of KVN TEAM
2020 전파망원경 사용자회의 (8월 13일)
Radio Telescope User’s Meeting 2020 (Aug 13, 2020)
Korean VLBI Network (KVN)
• 3 Telescopes (D = 21m)
• 22/43/86/129GHz
• 300 - 500 km
• 𝚯 = 1 - 6 mas
• Science Targets
AGN/SF/Evolved Star
+ microquasar
2
Yonsei
Tamna
Ulsan
θHBPW ~ 6 mas @ 22 GHz~ 1 mas @ 129 GHz
EAVN Status
Up to 16 radio telescopes (KOR 4, CHA 5, JAPAN 10)Observing frequency: 6.7GHz (11), 8GHz (14), 22GHz(15), 43GHz(11)Angular resolutions: 2.4 / 1.5 / 0.6 / 0.3 mas @ 6.7 / 8 / 22 / 43 GHzSensitivity (7-sigma detection, t_int = 60s, BW = 256 MHz)- 1.6 mJy @ 8GHz & 9.5 mJy @ 22GHz (Tianma-KVN)
VERA’s budget crisis
Severe budget cut was expected for 2020Bà 2020B Call for Proposals : KaVA 4 stations only (KVN+Mizusawa)However, VERA will fully participate to KaVA/EAVN observation until 2021 MarchVERA is trying to make a long-term plan for future operation
KVN/EAVN Operation Statistics 2019B/2020A
관측시즌 총관측수 총관측시간Cancel/ Fail
2019B 157 1606 73 / 0
2020A 265 1977 207 / 5
2019B Error Count KYS KUS KTN SUMAntenna control failure 2 18 4 24
Recording error 4 7 11 22Severe weather condition 10 7 15 32
Other problems 12 58 12 82Sum 28 90 42 160
2020A Error Count KYS KUS KTN SUMAntenna control failure 0 17 9 26
Recording error 9 5 3 17Severe weather condition 15 16 31 62
Other problems 59 83 24 166Sum 83 121 67 271
Other problems : mostly due to VFC and AWS (KUS)
KVN/EAVN Operation Status (2019)• VLBI ~ 3300h/yr & SD ~ 600h/yr• KVN Only ~ 1800h• KaVA (KVN and VERA Array) ~ 700h • EAVN/EVN/GMVA/Sejong ~ 800h
• KVN Key Science Projects : 1400h/yr• Evolved Star(1) & AGN (2)
• KaVA/EAVN Large Programs : 300h/yr• AGN, Star formation, Evolved stars, Galactic
astrometry
• Global Common Use : 1000h/yr• KVN(500h/yr) + KaVA/EAVN (500h/yr)
• Proposals status• 2018B: KVN(16), KaVA/ EAVN (15)• 2019A: KVN (12), KaVA/ EAVN (19)• 2019B: KVN (9), KaVA/EAVN (24)• 2020A: KVN (8), KaVA/EAVN(19)• 2020B: KVN (4), KaVA/EAVN(12)
• Total 135 refereed papers were published (since 2013)Toal 106 SCI papers (14 SCI papers/yr)
Radio Telescope User’s Meeting 2020 (Aug 13, 2020)
KVN System Upgrade: Receiver
KVN Receiver Freq. (old) Freq. (new) Trx (new) Installation
K-band 21.24 - 23.25 18 - 26 < 40Completed in ’18(all KVN stations)
Q-band 42.10 - 44.10 35 - 50 < 50KYS (’19)KUS (’21)
KTN (’20 Aug)
W-band 85 - 95 85 - 116 < 80KYS (’19)KUS (’18)
KTN (’20 Sep)
D-band 125 - 142 125 - 172 < 60 ’23 ~
• Upgrade current Rx by replacing narrow band components~ LNA, Feed Horn, Polarizer, tunable LO etc
• Instantaneous Bandwidth = 8GHz
• 4 ADC (4 x 16Gsps) • Input Freq. 8 - 16GHz• Digital Down Conversion• Digital Filtering• 4 x 10GbE output• VDIF format
Bandwidth(MHz)
Max Num of
Channels
Max Data Rate (Gbps)
8192 1 32
4096 2 32
2048 4 32
1024 8 32
512 16 32
256 16 16
128 16 8
64 16 4
32 16 2
16 16 1
• Max 16Gbps recording• 4 disk modules with
8 HDDs each• 4 10GbE input
OCTAD
Mark 6
KVN 4-Frequency Full Polarization
K-DAS (4 CH)+ OCTAD (4 CH) or
OCTAD (4 CH) + FILA10G (4 CH)
22 R/L, 43 R/L, 86 R/L, 129 R/LData rate: 1, 2, 4, 8, 16, 32 Gbps
KVN Baseline/Image Sensitivity
• Note: (baseline) / (image) sensitivity in the unit of mJy• When FTP is applied (maximum integration time of 30min & referenced from K),
the expected improvement of baseline sensitivity is more than 2 times better!
Frequency 22 GHz 43 GHz 86 GHz 129 GHz
SEFD (Jy) 1500 1800 3400 5000
Sensitivity (mJy, 1-sigma)
T_int=100s/ T_int=1hr
T_int=60s/ T_int=1hr
T_int=30s/ T_int=1hr
T_int=30s/ T_int=1hr
1 Gbps(Max 256 MHz)
9.6 / 1.28 14.9 / 1.53 39.8 / 2.89 58.5 / 4.25
2 Gbps(Max 512 MHz)
6.8 / 0.90 10.5 / 1.08 28.1 / 2.05 41.3 / 3.01
4 Gbps(Max 1024 MHz)
4.8 / 0.64 7.4 / 0.77 19.9 / 1.45 29.2 / 2.13
8 Gbps(Max 2048 MHz)
3.4 / 0.45 5.3 / 0.54 14.1 / 1.02 20.7 / 1.50
16 Gbps(Max 4096 MHz)
2.4 / 0.32 3.7 / 0.38 9.9 / 0.72 14.6 / 1.06
32 Gbps(Max 8192 MHz)
1.7 / 0.23 2.6 / 0.27 7.0 / 0.51 10.3 / 0.75
KVN Antenna Position Updates• The accuracy of KVN antenna positions are much improved.
based on Local Survey and KaVA K-band geodesy• Daily antenna positions of KVN is available• Great advantage for VLBI astrometry/geodesy
…
Example: Daily IVP of KVN Yonsei radio telescope (2015. 1. 1 ~ 2020.12.31)
KVN IVP measured by GPS
Important Dates and Notes• Summer maintenance: June 20 ~ August 31• 2020B season: 2020 Sep 1 ~ 2021 Jan 15• 2021A Call for Proposals: 2020 mid-September
• 2nd KVN KSP (16Gbps & full polarization, starting from 2020B)- The world’s largest plasma physics study of AGN with KVN (PI: Trippe)- Simultaneous monitoring of SiO and H2O masers toward evolved stars (PI: Yun)à KVN 2nd KSP meeting (Today! 16:00 – 18:00 via zoom)
• EATING VLBI (KVN/EAVN + Italian telescopes)- 30hrs / season (submit proposals to both KVN and Italy)- https://www.radiotelescopes.inaf.it/
• Simultaneous K/Q-band observing capabilities- open for KaVA and/or Yebes- 1Gbps for KaVA + Yebes (max 8 station, K/Q ~128MHz for each frequency)- 4Gbps for Yebes (K/Q ~ 512MHz for each frequency)- Yebes: http://rt40m.oan.es/
• EAVN low frequency VLBI science working group
KVN Archive DataBaseKVN 데이터 아카이브를 활용한 연구 활성화 : http://data.kasi.re.krà KVN archive
KVN 중장기 발전계획 (2020~2030)
• 국내외 전파관측시설의 KVN 수신기/광대역 시스템 확보 및 성능 향상(국내) 세종우주측지센터 22m, 서울대6m, TRAO14m(국외) EAVN, 이탈리아(Medicina 32m, Noto 32m, Sardenia 64m),
호주 Mopra 22m, 핀란드 Metsahovi 14m
• 광대역화와 e-VLBI를 통한 고감도/고성능 관측 수행• 2단계 핵심과학연구(KSP2) 운영 및 EAVN 대형과제 관측 지원• EHT와 같은 국제공동연구 활성화, KVN 수신시스템 국제확장을 통한 연구분야 선도
Thank you !