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HomeEventsOSSC February Meeting: The Supernova Acceleration Probe (SNAP)

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OSSC February Meeting: The Supernova Acceleration Probe (SNAP)

When:
Wednesday, February 12, 2020
Where:
Joint Forces Training Base MWR
Joint Forces Training Base – Los Alamitos - Banquet Rooms
4748 Yorktown Ave, Building 19 (Militia Room)
Los Alamitos, CA  90720

(562)795-2169
Additional Info:
Event Contact(s):
Sean M Wilson
3109332255 (p)
Category:
OSSC Regular Meeting
Registration is required
Payment in Full In Advance Or At Event
Cancellation Policy:
Please let the Arrangements Chair (Events@ossc.org) know as soon as possible.

Payments made in advance will normally be issued a credit that may be applied to future payments (membership or events). Please contact the Treasurer (Treasurer@ossc.org) if this posses a significant burden.
Activities/Items    (Click the down-arrow to the left of the activity/item to view the details)
Presentation
OSSC Dinner
Sponsor a Table
Sponsor a Student
Donate to the OSSC (Suggested Donation)
Wednesday 12 February
The Supernova Acceleration Probe (SNAP)
Studying Dark Energy in the Universe

by
Dr. Michael Sholl, SpaceX
Abstract:  The Supernova Acceleration Probe (SNAP) was a proposed experiment designed to quantify dark energy by measuring the redshift-magnitude diagram of supernovae and to quantify the growth of structure in the universe by measuring weak gravitational lensing over cosmological distances.  These techniques, along with baryon acoustic oscillation, are used to constrain dark energy density and matter density in modern cosmological models.  The baseline SNAP telescope was an ambient temperature, annular-field, configuration II Korsch, three-mirror astigmat (TMA), designed to fly at the L2 Earth-Sun Lagrange point.  The SNAP project evolved into the Joint Dark Energy Mission (JDEM), and finally the Wide-Field Infrared Survey Telescope (WFIRST).  Stray light analyses of the SNAP telescope included both overall systems engineering and budgeting, and detailed non-sequential modeling of the effects of dust, roughness and thermal infrared emission, as well as stop placement and baffle design.  The goal of the stray light design was to ensure that stray light in the 0.4 to 1.7 micron wavelength range did not exceed a small fraction of Zodiacal radiation within the mission's target field near the North ecliptic pole.  At visible wavelengths, the primary source of stray light was starlight scattered by the telescope mirrors.  In the longest wavelength bands, thermal emission from the mirrors and structure dominated the budget. Scattered stray light and thermal emissions were mitigated by baffles, an internal field stop, and a cold (140K) internal aperture stop.  Stray light scattered by mirror roughness and particulate contamination, as well as scattering from the telescope baffles, were modeled and shown to be less than 10% of Zodiacal levels in all bands.
About Our Speaker:  Michael Sholl earned his Ph.D. in Fluid Dynamics from the University of California at Berkeley in 1995. He was Project Manager of the Orbiting Far and Extreme Ultraviolet Spectrometer (ORFEUS-II), which launched on Space Shuttle Columbia in 1996.  Sholl worked on multiple programs at Lockheed Martin Missiles and Space, including the Trident-II missile and the Airborne Laser wavefront control system. From 1998 to 2003, he was Project Manager and Chief Engineer of the NASA/Berkeley Cosmic Hot Interstellar Plasma Explorer, the first, and only NASA University-Class Explorer mission.  Subsequently, he was DOE Optics and Straylight Lead Engineer for various dark energy missions, including SNAP, JDEM and WFIRST.  Sholl performed optical design trade studies for a prime focus corrector that led to the DESI project, which is currently being commissioned on the Mayall Telescope at Kitt Peak.  Sholl was Propulsion System Lead Engineer for the five hydrazine propulsion systems on the NASA/Berkeley THEMIS mission, which launched in 2007.  Two of these probes are currently operating in lunar orbit.  More recently, he performed optical design, stray light analysis and systems engineering on Google air and spaceborne imaging projects, as well as laser communication and glare reduction for the Google self-driving car cameras.  Sholl is currently Principal Optical Engineer at SpaceX, and he works on the Starlink satellite constellation.
Reception:  6:00pm
Dinner:  7:00pm
Members:  $35    Non-Members:  $40
OSSC Student Members:  $10
Presentation:  8:00pm
Please register by 8 February to avoid $5 late registration fee!

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