1. A brief introduction to QiTai radio Telescope (QTT)
Hello everyone, I name is from Xinjiang observatory.
It’s my pleasure bto be here to give a brief intro to QTT.
Na Wang（王娜） Lang Cui（崔朗）
Xinjiang Astronomical Observatory, CAS
CAS-NWO Workshop, Beijing

2. Outline Project Overview Telescope Scheme QTT site – recent status
Potential Collaborations

3. QTT Project Overview QiTai radio Telescope (QTT)
a Steerable 110-m Aperture Radio Telescope (SmART)
Active Surface
Freq Range 150 MHz – 115 GHz
Qitai
Nanshan
Urumqi
Ulastai
QTT is named after the site location, QiTai county in Xinjiang.
QTT will be a

4. Telescope Scheme Receiver Arrangement Type Band (cm) RF Freq (GHz)
Focus
Feed
Poln
Science Goals
Single
Pixel
100
0.15 – 0.6
Primary
Kildal
Linear
Pulsar, RRT 30
0.6 – 4
Horn
Pulsar, RRT, HI, OH, Galaxies 5
2 – 12
Greg.
Molecular spectrum, Galaxies; VLBI 1
12 – 36
Pulsar, H2O, NH3, VLBI
0.6
36 – 50
Molecular spectrum, High-z CO
0.3
72 – 115
Molecular spectrum, Galaxies
Dual-
13/3.6
2.2 – 2.5
8 – 9
Circular
VLBI, space exploration, System measurement (3.6cm)
3.6/0.9
30 – 34
VLBI, space exploration
Multi- 15
1 – 2
PAF
80 – 115
Horn(7/13 Beam)
There will be single pixel receivers, dual-band receivers and multibeam receivers
To meet different science

5. Telescope Scheme Pointing Accuracy:
6mm wave length: blind pointing ≤ 5arcs, repeatability precision ≤ 2.5arcs (wind speed ≤ 4m/s, temperature drift ≤ 2℃/h, observation time: 69.5% )
1cm wave length: ≤ 10arcs (wind speed ≤ 6m/s, temperature drift ≤ 3℃/h, observation time: 87.7% )
5cm wave length: ≤ 25arcs (wind speed ≤ 10m/s, temperature drift ≤ 5℃/h, observation time: 97.9% )

6. Key technology studies
Servo control and very accurate pointing
Active surface: measurement and adjust: OOF, holography
Reflector: parabolic dish vs. shaped design
Dividing the main reflector and number of actuators
Track and wheels: monolithic track & heavy load
Structure and electronics: environment under －30℃
Rx: wide band, Multi-beam, PAF
RFI shielding
Some key technolgy studies are on going or completed
15°
ring1……
ring22
5m2, 2856
12.5m2, 888

7. QTT site 1.5 kilometers long and 2 kilometers wide rectangle basin
Altitude range from 1730 m to 2250 m
Surrounding ridges form an isolated layer with outside region
刀条岭 北梁
中葛根河
马鞍山
天山山脉
The QTT site is a rectangle basin, located in the TianShan mountain hinterland,
QTT site surroundings
QTT site concept plan

8. QTT site elevation of mountain shelter
This fig gives the el of mountain shelter, the max shelter el is about 12 degree in the east

9. QTT site
Average annual rainfall of area: 180 mm to 200 mm (cf. average evaporation capacity of Xinjiang area is ~2000mm)
Precipitable water vapor:
Summer: ~19 mm
Spring and Autumn: ~8 mm to 9.5 mm
Winter: ~3 mm
Temperature range: maximum °, minimum °
QTT site has good weather conditions for high frequency observations.
The water vaper monitored in the site is about 3 mm in winter, 2 months
Temperature drifting
Ratio
≤ 5 ℃/hr
99.0%
≤ 3 ℃/hr
92.7%
≤ 2 ℃/hr
82.7%

10. QTT site Frequency distribution of extreme wind speed: Wind speed
Ratio
Qitai_Average
Qitai_Day
Qitai_Night
GBT
≤4m/s (3 beaufort scale)
65.9%
48.9%
83.0%
45.9%
≤6m/s (4 beaufort scale)
83.6%
74.3%
92.9%
64.5%
≤8m/s (5 beaufort scale)
93.7%
91.0%
96.6%
79.2%
≤10m/s (6 beaufort scale)
97.5％
96.7%
98.3%
88.9％
≥17m/s (8 beaufort scale)
0.14%
0.21%
0.06%
0.5%
Rare days with extreme wind speed

11. QTT site — Radio Quiet Zone
Proposals for the legislative protection of radio quiet zone are on going
core area (2.5 km × 4 km)
restricted area (10 km × 15 km)
coordination area (< 30 km)
There are three levels of protection in 30 km area

12. QTT site — Infrastructure Progress
Land acquisition: approved
Road flattening: done
Power: 10kV satisfy the infrastructure requirement
Water supply plan: assessed
Fiber connection: done for construction period

13. QTT Potential Collaborations
Science
Pulsar emission properties, and detection of gravitational waves with pulsar timing array (PTA )
Pulsar-like objects searching strategy
Spectral lines and masers single-dish survey and VLBI follow-up
Fine structures of AGNs and galaxies
High accuracy VLBI astrometry, astrodynamics and space VLBI
RRAT, FRB, Magnetar, and so on
We suggest some potential collaborations with QTT.

14. QTT Potential Collaborations
Receivers
(1) Technique of developing the PAF receiver, 7/3mm multi-beam receiver
Ultra-broad band OMT design and fabrication;
Compact LO distributor design;
Calibration signal distributor and calibration method;
Design of the compact heterodyne receiver array.
(2) Technique of developing broad band digital polarimeter

15. Summary QTT is a cooperative project between CAS & XJ
built in an excellent site (easily accessible, radio quiet, good weather conditions)
Outstanding and high sensitivity platform
Site infrastructure is underway
Telescope preliminary design to be finished
Project approval: key period this year
Collaborations welcome
I wanna to give a short summary.

16. Thanks
OK I stop here, Thank you for your attention.