Current Status of KVN

Chungsik Oh (KASI)VERA User’s Meeting 2017 @ Mizusawa

Outline• Operation in 2016 and 2017
• New Capabilities• Upgrade Activities– Wideband Backend– Wideband Receiver Project– pre-study of Extended KVN

VERA User’s Meeting 2017 @ Mizusawa

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KVN and KaVA(KVN and VERA Array)
KVN

22/43/86/129GHz
𝚹 ~ 1-6 mas

KaVA (KVN and VERA Array)
22/43(/86/129)GHz , 𝚹 ~ 0.5-1 mas

VERA User’s Meeting 2017 @ Mizusawa

3Operation Summary in 16B & 17A
2500

EVN,GMVAKaVA

EAVN
KVN KSPK-Geo
KVN Only

KaVA LP

2000
1500

1000500
013A

13B

14A

14B15A

15B

16A

16B

17A

• VLBI ~ 4000h / yr ( ~2000 h in 17B)

• KVN Key Science , KaVA Large Program from 2015
• + PaGAN (KSP), MASK, ToO• EAVN, EVN 22/43GHz + GMVA 86GHz > 300h / yr
VERA User’s Meeting 2017 @ Mizusawa

4Common Use Observations
Time1500

1200

Requested

Accepted

Time500

KVN

400

900

300

600

200

300

1000013B 14A 14B 15A 15B 16A 16B 17A 17B

Requested

Accepted

KaVA

14A 14B 15A 15B 16A 16B 17A 17B• KVN ~ 300h, KaVA ~ 250 h / semester• Proposal Deadline : Jun 1 (B) & Nov 1 (A)• Global Open (KVN S/D Domestic Only)• Target of Opportunity, KVN Filler Proposal (< ~8h)
VERA User’s Meeting 2017 @ Mizusawa

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SCI(E) Publications
Single DishPublications

20KVN

KaVA

15

10502010

1112

13

1415

1617Year• VLBI papers are increasing• S/D papers from 86 & 130GHz bands andPolarizations
VERA User’s Meeting 2017 @ Mizusawa

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New Capabilities : 8Gbps Operation• 4 x 512MHz BW• 3 times higher SNR• ~200 h in 2017A• Open for common useby S.-S. Lee
VERA User’s Meeting 2017 @ Mizusawa

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New Capabilities : 130GHz Polarization• Polarization Calibration up to 130GHz - JH Park

VERA User’s Meeting 2017 @ Mizusawa

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New Wideband Sampler: OCTAD• 4 ADC (4 x 16Gsps) + DBBC(DFB)• 4 IF x 2GHz BW (max 32Gbps)• Installation : 2017. 8, Test : 17B, 18A• Field Test at Yonsei• 2 IF x 8Gbps (2GHz BW : 8-10 GHz)
• 43 & 86GHz

Elecs co. (Japan)
VERA User’s Meeting 2017 @ Mizusawa

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KVN Wideband Backends (2018 - )4 x [Divider + BPF]

DigitalE/O

DigitalO/E

ADS1K

BBCDSMㄱㄱ
43 GHz FE

86 GHz FE

ADS1K

BBCADS1K

4 x 1Gsps

IF Selector

ㄱBBC

4 x 2Gbps

OCTAD (32Gbps)

ADC
129 GHz FE

fila10g

ADC

DigitalFilters

DBBC

ADC

4 x 8Gbps

Mark610G Switch

WDM
Optical
MUX

ADS1K

BBC

WDM
OpticalDMUX

ㄱ22 GHz FE

Mark6GPU SMGPU SM

ADC

4 x 16Gsps
10P4T IF Switch

Input Freq : 8-16GHz
VERA User’s Meeting 2017 @ Mizusawa

eVLBI
10wideband Rx Project• Term : 2017 - 2019
• Upgrade current Rx by replacing narrow band components– LNA, Feed Horn, Polarizer, LO etc
Freq(GHz)

Trx(K)

Installation

K16-26< 402017 - 18Q35-50< 502018 - 19

W85-115< 802018 - 19

D125-172< 602019

VERA User’s Meeting 2017 @ Mizusawa

11Upgraded 22GHz Rx for Yonsei• Compact Feed Horn
• Wideband CompactPolarizer• New LNA
• RF 18 - 26.5GHz• IF 8 - 16GHz• Tunable 1st LO

VERA User’s Meeting 2017 @ Mizusawa

12First Light with upgraded 22GHz Rx

NH3 Line at 23.7GHz

VERA User’s Meeting 2017 @ Mizusawa

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KVN-Extended : KVN 4th & 5th Sites
KVN 초기 사업계획(2002 IVS Proceedings)• Why new KVN sites ?
– More baselines 3 -> 6, 10– Amplitude self calibration– 3 times better imaging– better success rate & sensitivity•

Baselines : 40 - 500 km* longer baselines (> 500km) frominternational collaborations•

Frequency : 18 - 172 GHz•

Construction Period : ~3 yrs•

Budgets : ~15M USD / site

VERA User’s Meeting 2017 @ Mizusawa

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UV Coverage (Example)
Dec = -25

VERA User’s Meeting 2017 @ Mizusawa

Dec = -50

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Science Cases• AGNs• AGN Core-Jets, High-z AGN, LLANGs• AGN Feedbacks, Absorptions• Magnetic Field• SFR & Evolved Stars• Faint & extended maser features• Water & SiO, 44/95 Class I Methanol -> Kinematics& Magnetic Field• Microquasars, Pulsar, SNe, ..
• + S/D Sciences
Any ideas and/or suggestions are welcome
VERA User’s Meeting 2017 @ Mizusawa

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KVN + Sejong•

22-m Diameter•

Frequency : 2/8/22/43GHz•

Location: ~20km North from Daejeon•

Baselines between SJ-KVN•

YSUSTNSJYS-305

477

120US305-

358

206

TN477305-367SJ120

206

367

-2017 : Geodesy ~ 100h (2Gbps)
VLBI ~ 200h (1/2Gbps)•2018 : > 300h
- KaVA Geodesy or KVN+Sejong•

Common use from 2018B?

Summary• KVN KSP + KaVA Large Program era• VLBI Operation ~ 4000 h/yr
• Publications are increasing• International Collaboration ~ EAVN, EVN, GMVA
• Upgrade Activities• 8Gbps Mode & 130GHz Polarization are available• Wideband Backend & Receivers• pre-study of KVN-Extended Project• Any ideas and/or suggestions are welcome
VERA User’s Meeting 2017 @ Mizusawa

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