Pasadena Updates March February 2009 PFSMegacam MMIRS FourStar Some of the instruments arriving at Magellan in the next year

LDSS focus encoder Chronic LDSS focus setting errors Chronic LDSS focus setting errors Focus signal was noisy, causing focus seek errors Focus signal was noisy, causing focus seek errors Original LDSS focus encoder (voltage SLVC) Marshall, Estrada, Birk, Uomoto Navarrette, Merino, Quiroz, Alfaro, Cortes, Jones, Bravo, Cerda

LDSS focus encoder New current-loop LVDT encoder installed July 2008 New current-loop LVDT encoder installed July 2008 New LDSS focus encoder (current LVDT)

LDSS focus encoder Also installed a new A/D converter with Ethernet inside LDSS Also installed a new A/D converter with Ethernet inside LDSS Commercial A/D converter

LDSS temperature sensor LDSS focus is sensitive to temperature LDSS focus is sensitive to temperature Using the “dome air” temperature wasn’t quite good enough Using the “dome air” temperature wasn’t quite good enough LDSS focus and temperature sensors

LDSS temperature sensor Added AD592 sensor to LDSS camera Added AD592 sensor to LDSS camera Jorge Bravo maintains focus offset data Jorge Bravo maintains focus offset data LDSS AD592 temperature sensor

LDSS temperature sensor

F/5 secondary Mirror arrived LCO September 2009 Mirror arrived LCO September 2009 Felipe Sánchez works on the F/5 secondary

F/5 secondary Pneumatic mirror supports were manually operated for testing Pneumatic mirror supports were manually operated for testing Pablo Castro inspects the mirror supports

F/5 secondary Aluminized at the Dupont chamber Aluminized at the Dupont chamber Povilas Palunas inspects the mirror surface

F/5 secondary Installed on the Clay telescope Installed on the Clay telescope 1 inch too close to primary 1 inch too close to primary On the telescope

F/5 secondary New truss structure delivered to LCO New truss structure delivered to LCO Engineering with Minicam in April 2009 Engineering with Minicam in April 2009 On the telescope

F/5 baffles February 2009 Pasadena meeting with SAO engineers February 2009 Pasadena meeting with SAO engineers Decided to optimize baffles for Megacam as wider field instruments not scheduled Decided to optimize baffles for Megacam as wider field instruments not scheduled Mounting scheme discussions suggest a re-build of primary mirror shroud Mounting scheme discussions suggest a re-build of primary mirror shroud

F/5 baffles

Smaller Megacam primary baffles can be inserted from the backside of the primary Smaller Megacam primary baffles can be inserted from the backside of the primary New shroud extends through hole far past the primary mirror surface to support mid-height baffles New shroud extends through hole far past the primary mirror surface to support mid-height baffles

Cleanroom LCO Cleanroom excavation

Cleanroom

Cleanroom

Shipping news OCIW ships (exports) equipment to Chile from all over the world Air shipments 2X / month from Pasadena Chile has recently become a bit more formal on import papers; check with Earl Harris Instructions at Layoffs at Schenker have made shipping more difficult; please allow extra lead time

Bibliography

Bibliography 397 refereed publications as of December 31, refereed publications as of December 31, added since December 31, added since December 31, 2007 Papers missed in journals not available to OCIW or without searchable databases Papers missed in journals not available to OCIW or without searchable databases

Crabtree counts to 2007 By permission, Dennis Crabtree

Bibliography IMACS and MIKE swap places in 2008

Pasadena staffing Pasadena staffing news Pasadena staffing news –Alan Bagish returned part-time Jan 2009 –Accounting analyst Gillian Tong is permanent OCIW employee –Jorge Estrada received his bachelor’s degree