Keck Observatory Status 26 May99 William Lupton wluptonkeck

Keck Observatory Status 26 -May-99 William Lupton [email protected]. hawaii. edu EPICS ‘ 99 SLAC, May 26, 1999 Keck Observatory Status (William Lupton)

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

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

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 26 -May-99 ~600 Hz Wavefront sensor measures wavefront error and feeds back to deformable mirror Keck Observatory Status (William Lupton) 5

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 Deformable mirror corrects wavefront Infra-red camera Wavefront sensor 26 -May-99 ~600 Hz Wavefront sensor measures wavefront error and feeds back to deformable mirror Keck Observatory Status (William Lupton) 6

Adaptive Optics Overview (Keck II) Unix Instrument (IR camera) VME/EPICS Optical Bench 26 -May-99 User Interface Wavefront controller uses CA server library; is being ported to VME/EPICS Supervisory Control Telescope Control Wavefront Controller Laser System Keck Observatory Status (William Lupton) 7

Adaptive Optics first light picture 26 -May-99 Keck Observatory Status (William Lupton) 10

Laser traffic control From SPIE 3353 p 290; Wizinowich, Simons, Takame, Veillet, Wainscoat 26 -May-99 Keck Observatory Status (William Lupton) 12

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 FY 98 • Broad range of science capabilities 26 -May-99 Keck Observatory Status (William Lupton) 13

Site diagram / light pipes 26 -May-99 Keck Observatory Status (William Lupton) 14

Interferometer architecture (likely) Unix User interfaces (Java, C++, C) CA Vx. Works Interferometer sequencer (NASA remote agent; Lisp) Telescope sequencer (x 6) IIOP CA Interferometer control (JPL; RICST) CA Fast Slow hardware Telescope control (x 6, 2 with AO) 26 -May-99 Keck Observatory Status (William Lupton) 16

Interferometer architecture notes • Telescope sequencers run under Unix – more details in sequencer talk tomorrow – talk both CA and IIOP (via CDEV API? ) • Vx. Works 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) 17

Power PC timing tests (MVME 2307) • can process ~100, 000 records per second – 9 records at 10 k. Hz uses 87% of CPU • round-trip between 2 IOCs (100 MHz Ethernet) takes ~700 us – at 500 Hz uses 34% of sender’s CPU (6% when destination record is on same CPU) – at 1 k. Hz uses 65% of sender’s CPU (10% when destination record is on same CPU) • maximum observed round-trip time < 2 ms 26 -May-99 Keck Observatory Status (William Lupton) 18

Final slide 26 -May-99 Photo copyright W. M. Keck Observatory Status (William Lupton) 19