1. Green Bank Telescope Mark M. McKinnon
Structure & Optics
Special Features & Subsystems
Performance
Science
M. McKinnon, Synthesis Summer School, 25 June 2002

2. M. McKinnon, Synthesis Summer School, 25 June 2002

3. M. McKinnon, Synthesis Summer School, 25 June 2002
GBT Features
Unblocked Aperture
High aperture efficiency
Low sidelobes
Active Surface
Laser Metrology System
M. McKinnon, Synthesis Summer School, 25 June 2002

4. M. McKinnon, Synthesis Summer School, 25 June 2002
GBT Active Surface
2004 panels, 2209 actuators
Actuator travel = 51mm
Position Accuracy = 25 um
Actuator Control Room
Surface Actuator
M. McKinnon, Synthesis Summer School, 25 June 2002

5. M. McKinnon, Synthesis Summer School, 25 June 2002
Laser Metrology System
M. McKinnon, Synthesis Summer School, 25 June 2002

6. M. McKinnon, Synthesis Summer School, 25 June 2002
Laser Metrology System
Surface Retroreflectors
Ground Laser
Laser diode 1.5 GHz
Distance via phase detection, mod 10cm
Accuracy = m
M. McKinnon, Synthesis Summer School, 25 June 2002

7. M. McKinnon, Synthesis Summer School, 25 June 2002
Mechanical Drive Systems
Az Wheels & Track
El Gear & Motors
M. McKinnon, Synthesis Summer School, 25 June 2002

8. M. McKinnon, Synthesis Summer School, 25 June 2002
Upper Feed Arm
Subreflector
Prime Focus Boom
Receiver Room
M. McKinnon, Synthesis Summer School, 25 June 2002

9. M. McKinnon, Synthesis Summer School, 25 June 2002
Frequency Coverage
PF 1-1: GHz
PF 1-2:
PF 1-3:
PF 1-4:
PF 2 :
L : GHz
S :
C :
X :
Ku :
K :
K :
Q :
Gregorian Receiver Room
M. McKinnon, Synthesis Summer School, 25 June 2002

10. M. McKinnon, Synthesis Summer School, 25 June 2002
GBT Performance
Low Sidelobes
Excellent Pointing
FWHM = 12’/f(GHz)
M. McKinnon, Synthesis Summer School, 25 June 2002

11. M. McKinnon, Synthesis Summer School, 25 June 2002
Active Surface Performance
M. McKinnon, Synthesis Summer School, 25 June 2002

12. M. McKinnon, Synthesis Summer School, 25 June 2002
GBT First Science
Bistatic radar imaging of Venus
Discovery of 3 millisecond pulsars in M62
Discovery of youngest pulsar, PSR J
M. McKinnon, Synthesis Summer School, 25 June 2002

13. M. McKinnon, Synthesis Summer School, 25 June 2002
GBT Science: Imaging at 8.5 GHz
Orion Nebula
Galactic Center
Omega Nebula
M. McKinnon, Synthesis Summer School, 25 June 2002