Spectral Imaging of the Coronal Environment (SPICE) Caitlyn Quinn Summer 2010 Gregory Woytko, 547 Caitlyn Quinn Summer 2010 Gregory Woytko, 547

What is SPICE? Imaging coronal spectrograph One of ten instruments to fly on the ESA/NASA Solar Orbiter mission in 2017 Will orbit the sun at closest distances ever attempted, around 1/4 AU SPICE instrument currently in Phase A Imaging coronal spectrograph One of ten instruments to fly on the ESA/NASA Solar Orbiter mission in 2017 Will orbit the sun at closest distances ever attempted, around 1/4 AU SPICE instrument currently in Phase A

Solar Orbiter Mission Goals Evaluate plasma properties and composition of the sun with unprecedented spatial and spectral resolution Improve our understanding of the Sun’s effects on Earth and the solar system Better understand CME and space weather Evaluate plasma properties and composition of the sun with unprecedented spatial and spectral resolution Improve our understanding of the Sun’s effects on Earth and the solar system Better understand CME and space weather

Orbit.23 AU

The Instrument Sun’s light comes in through entrance aperture Ray hits primary mirror and series of optics Pre-slit deflects excess radiation Ray passes through slit mechanism; four slits of varying width Detectors interpret incoming EUV light Sun’s light comes in through entrance aperture Ray hits primary mirror and series of optics Pre-slit deflects excess radiation Ray passes through slit mechanism; four slits of varying width Detectors interpret incoming EUV light

The Detector (Housing and Door)

The Detector Spring-loaded door 2 detector stacks Spring-loaded door 2 detector stacks MCP HASFOC

Detector Stacks Micro Channel Plates (MCP) High voltage Fiber Optic Coupler (FOC) Transmits/focuses image HAS chip Intensified active pixel sensors Off-centered active area Components in stack connected by epoxy bond lines Micro Channel Plates (MCP) High voltage Fiber Optic Coupler (FOC) Transmits/focuses image HAS chip Intensified active pixel sensors Off-centered active area Components in stack connected by epoxy bond lines FOC HAS MCP

The Detector Door opens, EUV radiation hits MCPs MCPs are supplied a high voltage, detect and amplify incoming radiation Radiation and voltage transmit through FOC to HAS chip High voltage activates HAS pixels, which record incoming signal Door opens, EUV radiation hits MCPs MCPs are supplied a high voltage, detect and amplify incoming radiation Radiation and voltage transmit through FOC to HAS chip High voltage activates HAS pixels, which record incoming signal

HAS: Off-Centered Active Area

Bonding the Detector Together Epotek 310M Epoxy Plastic adhesive Transparent, maintains maximum strength down to  m Connection between HAS and fiber optic coupler is CRITICAL Determines resolution of images captured Epotek 310M Epoxy Plastic adhesive Transparent, maintains maximum strength down to  m Connection between HAS and fiber optic coupler is CRITICAL Determines resolution of images captured CRITICAL bond line

Critical Bond: FOC to HAS FOC focus: 4  m HAS pixels: 18  m Light refracts 30° on either side of ray from the FOC to epoxy Distance between FOC and HAS (i.e. bond thickness) determines spread Smaller spread, better resolution FOC focus: 4  m HAS pixels: 18  m Light refracts 30° on either side of ray from the FOC to epoxy Distance between FOC and HAS (i.e. bond thickness) determines spread Smaller spread, better resolution

Critical Bond: FOC to HAS Worst case scenario: bond line  12  m, single focused ray spreads over multiple HAS pixels

Issues With Bonding ESD sensitivity of HAS Accuracy, precision How to ensure precise placement of FOC in active area despite slight variations in HAS chips? 2 bonds on one FOC Expense of HAS Only get “one shot” to do it right during actual fabrication Solution?? ESD sensitivity of HAS Accuracy, precision How to ensure precise placement of FOC in active area despite slight variations in HAS chips? 2 bonds on one FOC Expense of HAS Only get “one shot” to do it right during actual fabrication Solution??

Bonding Fixture Grounded metal plate with HAS-shaped pocket Outer holes to secure fixture and ground plate Holes around pocket for T-shaped alignment bars (adjustable) HAS is removable after bonding is achieved Drawings approved, quote received, solid models in the making! Grounded metal plate with HAS-shaped pocket Outer holes to secure fixture and ground plate Holes around pocket for T-shaped alignment bars (adjustable) HAS is removable after bonding is achieved Drawings approved, quote received, solid models in the making!

SPICE: General Issues Ability of instrument to withstand wide range of temperatures Will the detector and bonds withstand testing: vibration, thermal, acoustic, etc? Passing upcoming CDR Delayed execution of instrument (>3 yrs) Ability of instrument to withstand wide range of temperatures Will the detector and bonds withstand testing: vibration, thermal, acoustic, etc? Passing upcoming CDR Delayed execution of instrument (>3 yrs)

Other Experiences at NASA Working alongside engineers, scientists, machinists Clean room training Disassembling hardware Machine Shop ESDM 5-axis milling Metrology, FARO arms Rapid prototyping:  SLA  Working alongside engineers, scientists, machinists Clean room training Disassembling hardware Machine Shop ESDM 5-axis milling Metrology, FARO arms Rapid prototyping:  SLA 

2 in.

Questions?