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Pasadena Updates. PFS. Megacam. March 2008 - February 2009. FourStar. MMIRS. Some of the instruments arriving at Magellan in the next year. LDSS focus encoder. Chronic LDSS focus setting errors Focus signal was noisy, causing focus seek errors. Marshall, Estrada, Birk, Uomoto

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Pasadena updates

Pasadena Updates



March 2008 - February 2009



Some of the instruments arriving at Magellan in the next year

Ldss focus encoder
LDSS focus encoder

Chronic LDSS focus setting errors

Focus signal was noisy, causing focus seek errors

Marshall, Estrada, Birk, Uomoto

Navarrette, Merino, Quiroz, Alfaro, Cortes, Jones, Bravo, Cerda

Original LDSS focus encoder (voltage SLVC)

Ldss focus encoder1
LDSS focus encoder

New current-loop LVDT encoder installed July 2008

New LDSS focus encoder (current LVDT)

Ldss focus encoder2
LDSS focus encoder

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

Commercial A/D converter

Ldss temperature sensor
LDSS temperature sensor

LDSS focus is sensitive to temperature

Using the “dome air” temperature wasn’t quite good enough

LDSS focus and temperature sensors

Ldss temperature sensor1
LDSS temperature sensor

Added AD592 sensor to LDSS camera

Jorge Bravo maintains focus offset data

LDSS AD592 temperature sensor

F 5 secondary
F/5 secondary

  • Mirror arrived LCO September 2009

Felipe Sánchez works on the F/5 secondary

F 5 secondary1
F/5 secondary

  • Aluminized at the Dupont chamber

Povilas Palunas inspects the mirror surface

F 5 secondary2
F/5 secondary

Installed on the Clay telescope

1 inch too close to primary

On the telescope

F 5 secondary3
F/5 secondary

New truss structure delivered to LCO

Engineering with Minicam in April 2009

On the telescope

F 5 baffles
F/5 baffles

  • February 2009 Pasadena meeting with SAO engineers

  • Decided to optimize baffles for Megacam as wider field instruments not scheduled

  • Mounting scheme discussions suggest a re-build of primary mirror shroud

F 5 baffles2
F/5 baffles

  • 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


LCO Cleanroom excavation


LCO Cleanroom excavation


LCO Cleanroom excavation

Shipping news
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


  • 397 refereed publications as of December 31, 2008

  • 74 added since December 31, 2007

  • Papers missed in journals not available to OCIW or without searchable databases

Crabtree counts to 2007
Crabtree counts to 2007

By permission, Dennis Crabtree


IMACS and MIKE swap places in 2008

Pasadena staffing
Pasadena staffing

  • 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