1. Keck Observatory Status
William Lupton
EPICS ‘99
SLAC, May 26, 1999

2. Keck Observatory Status (William Lupton)
Keck I
Keck II
26-May-99
Keck Observatory Status (William Lupton)

3. Observatory status Keck I Keck II Operational May 1993
Originally not EPICS
Retrofitted in Mar 1997
Optical instruments
echelle spectrograph
Infra-red instruments
camera
spectrometer
Keck II
Operational Oct 1996
Has always been EPICS
Optical instruments
imaging spectrograph
Infra-red instruments
echelle spectrograph
New project
Adaptive Optics (AO)
Note: no instruments use EPICS
26-May-99
Keck Observatory Status (William Lupton)

4. Keck Observatory Status (William Lupton)
Adaptive Optics (off)
Plane (spherical) wavefront
in space
Beam-splitter passes IR light to camera and reflects visible light to wavefront sensor
Atmosphere distorts wavefront
Infra-red
camera
Deformable mirror (flat because someone forgot to turn it on)
Wavefront sensor measures wavefront error and feeds back to deformable mirror
Wavefront
sensor
~600Hz
26-May-99
Keck Observatory Status (William Lupton)

5. Keck Observatory Status (William Lupton)
Adaptive Optics (on)
Plane (spherical) wavefront
in space
Beam-splitter passes IR light to camera and reflects visible light to wavefront sensor
Atmosphere distorts wavefront
Infra-red
camera
Deformable mirror corrects wavefront
Wavefront sensor measures wavefront error and feeds back to deformable mirror
Wavefront
sensor
~600Hz
26-May-99
Keck Observatory Status (William Lupton)

6. Adaptive Optics Overview (Keck II)
Unix
VME/EPICS
Wavefront controller
uses CA server lib-
rary; is being ported
to VME/EPICS
Instrument
(IR camera)
User
Interface
VME/EPICS
Supervisory
Control
Telescope
Control
Optical
Bench
Wavefront
Controller
Laser
System
26-May-99
Keck Observatory Status (William Lupton)

7. Adaptive Optics first light picture
26-May-99
Keck Observatory Status (William Lupton)

8. Keck Observatory Status (William Lupton)
Laser traffic control
From SPIE 3353 p290; Wizinowich, Simons, Takame, Veillet, Wainscoat
26-May-99
Keck Observatory Status (William Lupton)

9. Interferometer Overview
Interferometry with
two 10-m Keck telescopes (with natural guide star AO)
four to six 1.8-m outrigger telescopes (no AO but with fast tip/tilt correction)
NASA-funded joint project between JPL and Keck
Five-year development; funding started FY98
Broad range of science capabilities
26-May-99
Keck Observatory Status (William Lupton)

10. Site diagram / light pipes
26-May-99
Keck Observatory Status (William Lupton)

11. Interferometer architecture (likely)
Unix
User interfaces (Java,C++,C) CA
Interferometer sequencer (NASA remote agent; Lisp)
IIOP
Telescope sequencer (x6) CA
VxWorks
Interferometer control (JPL; RICST)
Telescope control (x6, 2
with AO) CA
Fast
hard-
ware
Slow
hard-
ware
26-May-99
Keck Observatory Status (William Lupton)

12. Interferometer architecture notes
Telescope sequencers run under Unix
more details in sequencer talk tomorrow
talk both CA and IIOP (via CDEV API?)
VxWorks ORB (ACE/TAO)
interoperability between Java, C++ and Lisp has been demonstrated (Lisp uses ILU)
RICST will use CA to access slow hardware
e.g. transport optics (PMAC, c.f. AO)
26-May-99
Keck Observatory Status (William Lupton)

13. Power PC timing tests (MVME2307)
can process ~100,000 records per second
9 records at 10kHz uses 87% of CPU
round-trip between 2 IOCs (100MHz Ethernet) takes ~700us
at 500Hz uses 34% of sender’s CPU (6% when destination record is on same CPU)
at 1kHz uses 65% of sender’s CPU (10% when destination record is on same CPU)
maximum observed round-trip time < 2ms
26-May-99
Keck Observatory Status (William Lupton)

14. Keck Observatory Status (William Lupton)
Final slide
26-May-99
Keck Observatory Status (William Lupton)
Photo copyright W. M. Keck Observatory