Pasadena Pasadena UpdatesUpdates

March 2008 - February March 2008 - February 20092009

PFS Megacam

MMIRSFourStar

Some of the instruments arriving at Magellan in the next year

LDSS focus encoderLDSS focus encoder

Chronic LDSS focus Chronic LDSS focus setting errorssetting errors

Focus signal was Focus signal was noisy, causing focus noisy, causing focus seek errorsseek errors

Original LDSS focus encoder (voltage SLVC)

Marshall, Estrada, Birk, UomotoNavarrette, Merino, Quiroz, Alfaro, Cortes, Jones, Bravo,

Cerda

LDSS focus encoderLDSS focus encoder New current-loop New current-loop

LVDT encoder LVDT encoder installed July 2008installed July 2008

New LDSS focus encoder (current LVDT)

LDSS focus encoderLDSS focus encoder Also installed a new Also installed a new

A/D converter with A/D converter with Ethernet inside LDSSEthernet inside LDSS

Commercial A/D converter

LDSS temperature LDSS temperature sensorsensor

LDSS focus is LDSS focus is sensitive to sensitive to temperaturetemperature

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

LDSS focus and temperature sensors

LDSS temperature LDSS temperature sensorsensor

Added AD592 Added AD592 sensor to LDSS sensor to LDSS cameracamera

Jorge Bravo Jorge Bravo maintains focus maintains focus offset dataoffset data

LDSS AD592 temperature sensor

LDSS temperature LDSS temperature sensorsensor

F/5 secondaryF/5 secondary Mirror arrived Mirror arrived

LCO September LCO September 20092009

Felipe Sánchez works on the F/5 secondary

F/5 secondaryF/5 secondary Aluminized at Aluminized at

the Dupont the Dupont chamberchamber

Povilas Palunas inspects the mirror surface

F/5 secondaryF/5 secondary Installed on the Installed on the

Clay telescopeClay telescope 1 inch too close 1 inch too close

to primaryto primary

On the telescope

F/5 secondaryF/5 secondary New truss structure New truss structure

delivered to LCOdelivered to LCO Engineering with Engineering with

Minicam in April 2009Minicam in April 2009

On the telescope

F/5 bafflesF/5 baffles February 2009 Pasadena meeting with SAO February 2009 Pasadena meeting with SAO

engineersengineers Decided to optimize baffles for Megacam as wider Decided to optimize baffles for Megacam as wider

field instruments not scheduledfield instruments not scheduled Mounting scheme discussions suggest a re-build Mounting scheme discussions suggest a re-build

of primary mirror shroudof primary mirror shroud

F/5 bafflesF/5 baffles

F/5 bafflesF/5 baffles Smaller Megacam Smaller Megacam

primary baffles can be primary baffles can be inserted from the inserted from the backside of the backside of the primaryprimary

New shroud extends New shroud extends through hole far past through hole far past the primary mirror the primary mirror surface to support surface to support mid-height bafflesmid-height baffles

CleanroomCleanroom

LCO Cleanroom excavation

CleanroomCleanroom

LCO Cleanroom excavation

CleanroomCleanroom

LCO Cleanroom excavation

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 http://shipping.baade-clay.org/ Layoffs at Schenker have made shipping more

difficult; please allow extra lead time

BibliographyBibliography

BibliographyBibliography 397 refereed 397 refereed

publications as of publications as of December 31, 2008December 31, 2008

74 added since 74 added since December 31, 2007December 31, 2007

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

Crabtree counts to 2007Crabtree counts to 2007

By permission, Dennis Crabtree

BibliographyBibliography

IMACS and MIKE swap places in 2008

Pasadena staffingPasadena staffing Pasadena staffing newsPasadena staffing news

– Alan Bagish returned part-time Jan 2009Alan Bagish returned part-time Jan 2009– Accounting analyst Gillian Tong is permanent Accounting analyst Gillian Tong is permanent

OCIW employeeOCIW employee– Jorge Estrada received his bachelor’s degreeJorge Estrada received his bachelor’s degree