1. VLBI in China and the Collaboration with NL
Zhi-Qiang Shen
Shanghai Astronomical Observatory
Chinese Academy of Sciences
CAS-NWO Workshop on Radio Astronomy
( April 2017, NAOC, Beijing, China )

2. VLBI Development in China
1970s VLBI Network Concept
1980s Shanghai 25m
1990s Urumqi 25m
2000s Beijing 50m & Kunming 40m
+ correlator
pre-study of Space VLBI
2010s Shanghai 65m, FAST (500m), QTT 110m …
Chinese VLBI Network 南山
Shanghai 65m (2012)
FAST (2016)

3. VLBI in China
It takes 30+ years ( ) to establish the so-called Chinese VLBI network (CVN)!
Nowadays, the CVN of five VLBI stations plus a correlation center has gradually performed astrophysical and geodetic observations as well as the VLBI tracking of space probes.
Member of VLBI Networks: EVN, IVS, EAVN …
Participating in international collaborations in sciences and VLBI technologies,
long-term Dutch-Chinese collaboration in VLBI

4. CN-NL collaboration in the area of VLBI
1985 Nan Rendong worked Prof. Win Brouw & Richard the Netherlands Foundation for Radio Astronomy (NFRA)
personnel exchanges in VLBI techniques (Rx engineers/technicians) and sciences (researchers)
2000s initiated various projects by Hong Xiaoyu & Leonid Gurvits & Richard Strom
Members of EVN; JIVE board
Supervision of joint PhD projects
In 2009 NWO awarded JIVE-ShAO grant for collaboration in the development of the Next Generation VLBI correlator and Space Science VLBI applications
Shen Zhiqiang & Zsolt Paragi continued the Dutch-Chinese collaboration, prioritized to well-focused research projects under the CAS-KNAW(Royal Netherlands Academy of Arts and Sciences)-CEP (China Exchange Programme)
Black Holes at the highest resolution: Exploring the scientific potentials of the EVN and the emerging Chinese VLBI Network

5. VLBI topics for the March 2017 joint CAS-NWO call in the field of Radio Astronomy
bilateral cooperation (Sino-Dutch)
in more general terms with broader scientific/technological interests/areas than just one VLBI observing project or a single method
compact structures on the smallest angular scales (through VLBI)
NL: EVN, JIV-ERIC host SFXC
CN: CVN/EVN
Science Targets:
FRB (localization/identification)
space-crafts (tracking & navigation; space sciences )
SMBH shadow …
Developments:
VLBI with FAST
digital backends/correlator, e-VLBI
space VLBI (ultra-long wavelengths, millimeter )
Africa VLBI Network

6. Space Millimeter VLBI Array
Main Scientific Objectives:
High-resolution imaging of emission structure surrounding super-massive black hole (SMBH) to study
SMBH Shadow (e.g. M87)
Disk structure & dynamics, SMBH mass (water mega-masers)
Astrophysical Jet in Active Galactic Nuclei (AGN)
Specifications:
Two 10-m (in diameter) space antennas
Three frequency bands (8, 22 & 43 GHz)
Dual polarization (LCP/RCP)
Date rate (1.2 Gbps , or 2.4 Gbps)
Angular resolution: 20 micro-arc-second
Optimized orbits for a better (u,v) coverage
Apogee: 60,000 km
Perigee: 1,200 km
Inclination: 28.5 deg
Life time: 3 year
相关计划表加入到PPT中 6

7. Review Mtg @CAST in June 2016!
High precision reflector: 10m diameter with a surface accuracy better than 0.4mm (RMS)