SNAP Observatory (S-17 & TMA-65)
SolidWorks native files
load "_SNAP_Model_Rev_F.sldasm" first

SNAP Observatory (S-17 & TMA-65)
STEP AP214 files

SNAP Observatory (S-17 & TMA-65)
eDrawing file

Through-focus plots of PSF and WFE for TMA72

Levi, M., GigaCam - A One Billion Pixel Imager, STScI Workshop, 2000-9-29.

Lampton, M., Draft Optical Specification, 2001-05-25.

Sholl, M., SNAP Secondary Support Diffraction - Report, 2001-08-24.

Kraft, D., Delta IV launch capacity for SNAP mission and dispersion estimate, 2002-01-25.

Concha, M., SNAP Elliptical Orbit and Telemetry, 2002-03-01.

SNAP SUN-EARTH L2 HALO ORBIT OPTION HIGHLIGHTS
A “QUICK LOOK” DRAFT ASSESSMENT
Gabe Karpati's L2 orbit study.
2003-12-11

SNAP L2 Orbit Eclipse/Antenna Study
Patrick Jelinsky
01/07/2004

P. Jelinsky
2004-01-26

SNAP L2 Orbit Scattering Angles
Patrick Jelinsky
01/26/2004

P. Jelinsky
2004-01-26

SNAP L2 Orbit Scattering Angles for near Ecliptic Pole Pointings
Patrick Jelinsky
02/20/2004

P. Jelinsky
2004-03-08

Proposed athermalized mount for spectrograph
Sholl, M.
20 May 2004

Random notes relative to telescope design
Henry Heetderks
2004-07-30

Labyrinth stray light traps for SNAP optics bay
Michael Sholl
13 January 2005

Flatfield irradiance variations, at the focal plane, due to discrete sources on the Ring of Fire (includes Matlab code used for integral computations)

An update of the current (8 March 2005) preferred configurations of the four telescope mirrors.

Considerations for 34deg baffle slice decision

Rockwell H2-RG and SIDECAR power estimate
C. Bebek 6 April 2005

Visible and NIR detector pixel counts
C. Bebek 11 April 2005

Spot size and OPD vary at different radii on the focal plane. Potentially useful performance metrics are the pixel-weighted spot size and OPD. These are computed, and reported herein.

SNAP Telescope Properties, revised 23 July 2007

Ponslet, E., 3D CAD Viewer PC executable of telescope, 2000-8-31.

SNAP L2 Orbit Eclipse/Antenna Study
Patrick Jelinsky
01/07/2004

SNAP L2 Orbit Scattering Angles
Patrick Jelinsky
01/26/2004

SNAP L2 Orbit Scattering Angles for near Ecliptic Pole Pointings
Patrick Jelinsky
02/20/2004

Cassegrain Shutter Exposure
Patrick Jelinsky
04/21/2004

Shutter Exposure Determination
Patrick Jelinsky
06/03/2004

SNAP Telescope Polarization
Patrick Jelinsky
06/09/2004

Fuel Cost to go to L2
Patrick Jelinsky
06/21/2004

L2 Amplitude: Antenna Slew Angle Implications
Patrick Jelinsky
06/28/2004

Scatter Sources for SNAP
Patrick Jelinsky
07/01/2004

SNAP Flight Thermal Sensors
Patrick Jelinsky
09/03/2004

SNAP Reaction Wheel Size
Patrick Jelinsky
12/20/2004

SNAP Observatory E-Drawing (S-17 & TMA-65)
download free software from www.solidworks.com

summary of current (8 March 05) baselined telescope structure

NASTRAN model of SNAP Telescope.
Robert Besuner 13 May 2005

NASTRAN finite element model of fold flat mirror and supports for TMA-65

AutoCAD release 14 solid model of mirror design shown in SNAP-TECH-06008.pdf

Ponslet, E., Trade Studies for the SNAP secondary Mirror Metering Structure, HTN-113005-0002, 2000-8-10.

Levi, M., Optical Telescope Assembly Definition and Requirements, 2000-9-5.

Secroun, A., etal, SNAP Star Guider, 2000-10-26.

Ponslet, E., System Level Modeling of the SNAP Instrument and Analysis of Reaction-wheel-Induced Jitter, 2000-12-14.

Ponslet, E., Design Requirements for the SNAP Telescope Structures, 2001-01-16.

Bebek, C., CCD Testing Status Report, 2001-03-21.

Karcher, A., Proton damage in p-channel CCD's (paper), 2001-11-15.

Kolbe, W., Proton radiation damage in high-resitivity n-type silicon CCDs (2002 SPIE), 2002-01-31.

Report on Preliminary Engineering Design Study for SNAP Stray Light Baffle and Baffle Contamination Cover
April 25, 2002
Robert Besuner

Preliminary Structural Design Study of the SNAP
Secondary Mirror Support Structure
April 27, 2002
Robert Besuner

Lampton, M., SNAP Focal Plane (SPIE 2002), 2002-07-30.

Ealet, A., SNAP Spectrograph (SPIE 2002), 2002-07-30.

Informal Update on Preliminary Engineering Design Study for SNAP Optical Telescope Assembly
September 30, 2002
Robert Besuner

NATURAL ENVIRONMENT NEAR THE SUN/EARTH-MOON L2 LIBRATION POINT
Prepared for the
NEXT GENERATION SPACE TELESCOPE PROGRAM
Steven W. Evans, Editor
Marshall Space Flight Center
MSFC, Alabama
besuner 2003-11-21

STScI NGST Libration Point Introduction
Michael Mesarch
NASA/GSFC
Guidance Navigation and Control Center
March 31, 1999
Uploaded by R. Besuner
2003-11-21

Informal Update on Preliminary Engineering Design Study for SNAP
Optical Telescope Assembly
September 30, 2002

R. Besuner
2004-02-02

Interim Report on Preliminary Engineering Design Study for SNAP
Secondary Mirror Support Structure
April 27, 2002

R. Besuner
2004-02-02

Cemenska, J. - SNAP ACS Sensors & Kalman Filter Studies

Another scheme to reduce residual stresses in bipod to mirror and optic bench attachment system.
Henry Heetderks
2005-01-13

How a pipeline ADC works
Markus Redelstab Thesis 28 Feb 2005

Darrell Zimbleman's GOES gyro modeling notes

SPIE August 2005 PSF STABILITY 5899-04 paper

Analysis of SM corrections to 1-g sagging telescope. Do we need to offload all the mirrors, or just the PM? Both bulk motions and mirror figure changes are analyzed. Bottom line is we will need to offload the figure of the PM, but will not need to offload or support any other mirrors.

SNAP straylight status presentation from March 15 2005

Mirror material grades, thermal gradients and coating distortion for the SNAP PM are investigated.

Folding Flat Mirror Curvature Tolerance

Primary mirror dwg PBZ1845A.pdf

Primary mirror dwg TBRZ1845.pdf

Primary mirror dwg PBZ2050A.pdf

Primary mirror dwg TBRZ2050A.pdf

Primary mirror dwg TBFZ2050A.pdf

Open Back Test Article

Two alternative OBZ primary mirror profiles

Primary Mirror dwg TBF3Z1990.pdf

Strain and figure of 1990mm OBZ primary mirror under horizontal and vertical 1-G loading

Analysis of distortions of the Primary Mirror due to gradients from radiation heat flow from the front face.

Primary mirror dwg 1990PMOB rev A

Discussion of OTA natural frequency.

Cassegrain Mask and Shutters

Design Limit Loads

lightweighting drawing

Lampton, M., SNAP Telescope (SPIE 2002), 2002-07-30.

Tarle, G., SNAP Infrared Detector R&D (SPIE 2002), 2002-07-30.

SPIE August 2005 PSF STABILITY 5899-04 oral presentation

Notes on Graphite Fiber

H. Heetderks
2004-02-13

Pankow, D., Optical Telescope Thermal concept, 2002-01-01.

SNAP Mission Requirements Document
Draft Rev A
R. Digennaro
2003-08-18

Summary of OTA Model 36
complete SNAP FEA model as of 9/15/03
R. Besuner
2003-09-15

Lampton, M., TMA55 Three Mirror Anastigmat Design, 2000-7-20.

Ponslet, E., Structural Engineering for the SNAP Telescope: Status Report, HPS-113005-0001, 2000-11-03.

Sholl, M., SNAP Secondary Support Diffraction - Presentation, 2001-08-24.

Karcher, A., Proton damage in p-channel CCD's (talk), 2001-11-15.

Lampton, M., TMA62A Telescope Optical Concept, 2002-01-01.

Lampton, M., Straylight estimate, 2002-01-01.

Kolbe, W., Proton radiation damage in high-resitivity n-type silicon CCDs, presentation (2002 SPIE), 2002-01-31.

Lampton, M., NASA SEU Technology part 1, 2002-05-07.

Bebek, C., NASA SEU Technology part 2, 2002-05-07.

SNAP Attitude Control -- Level zero Simulation
UCB Mech Engineering Dept
Kim, Jennings, Nawaz, Auslander
2003-04-04

Sholl Hexapod Presentation, rev B

 This describes the forward and backward solutions

for a hexapod. Further, it details strains on the flexure joints from 1mm lateral, and 1deg rotation
motions of the mirror.
M. Sholl
2003-04-28

Libration Orbit Seminar
(AETD Mini Course #27)
David Folta Code 595 GSFC
Mission Engineering and System Analysis
2003-10-22

Mirror Support: Edge, 70%, or both?
M. Lampton

2004-01-29

SNAP Telescope presentation presented to 2004 SPIE Astronomical Telescope Conference in Glasgow

A nice description of the Keck thermally compensated bipods which include an end flexure
Bruce Bigelow
2004-06-04

Primary Mirror Point-Load Offloading.
Number of offloaders varies from zero to 60. Inverted vs. normal bipods. Sensitivity to errors in offloader direction and magnitude.

Strawman Spacecraft Configuration 2005 March 11

Primary mirror frit growth calculations, R. Besuner

Zodiacal rates behind filters
C. Bebek 12 April 2005

SNAP version 2 CCD operational differences
C. Bebek 5 April 2005

Examine behavior of the telescope, mirror shifts, and primary mirror distortions under one g for three cases: no PM offloading; PM offloaders react against telescope; PM offloaders react external to telescope.

Obs 38 free-free modes
jpegs and avi's showing modes of current free-free observatory model. Modes 1-6 are rigid-body. Frequencies, starting at mode 7 are 22.6, 23.2, 27.0, 32.2, 33.9, 35.6, 35.9, 36.2 Hz.
R. Besuner
2004-01-29

OTA Model 36
Nastran model of entire observatory as output by Algor translation utility. Not certain if it has material data in it.
R. Besuner
2003-09-15

STEP file of one sixth of solid model of mirror design shown in SNAP-TECH-06008.pdf