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May 8, 2008 FUSP1 MIC WFF 1

Far Ultraviolet SpectroPolarimeter(FUSP)

Flight #1: 36.173

Target: β and ζ TauK. Nordsieck

University of WisconsinMay 8, 2008

Science Overview Experiment Design Overview Flight Events Schedule & Status

May 8, 2008 FUSP1 MIC WFF 2

FUSP Goals: the first Astronomical Polarimetry below 1300 Ǻ

Scientific Circumstellar envelope geometry in hot stars (supergiants, Oe/Be,

WR, interacting binaries) Look for new continuum polarization effect - H Rayleigh

scattering Nature of very small interstellar dust grains. Test new magnetic field diagnostics

Hanle Effect: polarized stellar emission lines Magnetic Realignment: polarized interstellar absorption

lines

Technology: Develop FUV polarimetric analysers Program: Motivate inclusion of FUV Polarimeters on

orbital missions

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May 8, 2008 FUSP1 MIC WFF 3

Technique

Linear polarization across spectral lines Astro/WUPPE showed unexpected strong line

blanketing effects in Be star polarization. Attributed to FeII absorption in scattering disk.

Far UV has resonance lines which should themselves be polarized, depending on geometry and magnetic field

Continuum linear polarization near Ly α interstellar dust grains

May 8, 2008 FUSP1 MIC WFF 4

Requirements

Resolution: high enough for line profiles => minimize jitter Polarimetry: 0.01% precision Highest possible throughput and exposure time for required S/N Wavelengths: As low as possible

< 1500Å to cover main resonance lines

Specifications Resolution: λ/∆λ = 3000 (∆λ = 0.4 Ǻ) Aperture: 20 inch (F/2.5) Focal Scale 1 pixel = 24µ = 4 arcsec = 0.44 Ǻ Wavelengths: 1050 -1500 Ǻ Polarimetry: Modulated Single-Beam

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May 8, 2008 FUSP1 MIC WFF 5

FUSP Program Targets

Plan 3 - 6 launches Third launch possible high resolution spectrometer

(under development)

0.40.4

0.20.03

0.040.2

0.060.08

%Err

Sep Apr

0.090.09

350350

0.70.7

4.75.1

θ1 andθ2 Ori

AbsPolAbsPol

3b(hi-res)

Jun Sep

110

200150

2.-0.5

3.53

β Lyrσ Sco

IntbinISM

3a- or -

Sep Apr

11

200150

-2.51.0

24

ζ Oriξ Per

HanleHanle

2

Sep Apr

101

50300

-0.5-0.3

23

β Tauζ Tau

UnpolBe

1(36.173)

Window∆λExp m1330VTargetProgramFlight

May 8, 2008 FUSP1 MIC WFF 6

36.173 Science Goals

β Tau: Instrumental Polarization Calibration/ Precision Assessment ζ Tau: Polarization Efficiency verification (Astro/WUPPE overlap) ζ Tau Science: How do hot stars shed enough angular momentum to

allow them to form? Resonance line blanketing profiles => disk geometry/ dynamics H Rayleigh polarization signature => disk ionization NV, SiIV resonance polarization? => polar flow?

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May 8, 2008 FUSP1 MIC WFF 7

ζ Tau Geometric Model

May 8, 2008 FUSP1 MIC WFF 8

ζ Tau FUSP Simulation

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May 8, 2008 FUSP1 MIC WFF 9

Optics Design Telescope: Spectropolarimetry

needs lots of photons! largest possible primary longest possible exposure

Spectrometer fast F/2.5 focal ratio for

pointing insensitivity single reflection aberration-

corrected grating for FUV sensitivity

zero-order sensor for centering in visible. (future: tracking?)

UV-sensitized CCD for high photon rate

Polarimetry: New Technology rotating stressed retardation

plate to for high-precision differential polarimetry

brewster-angle mirror for single-beam FUV polarimetry

May 8, 2008 FUSP1 MIC WFF 10

Optics Section Design

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May 8, 2008 FUSP1 MIC WFF 11

Electronics Design

May 8, 2008 FUSP1 MIC WFF 12

Launch Configuration

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May 8, 2008 FUSP1 MIC WFF 13

36.173 Launch Window

Target RA= 5 37 38 Dec= 21 8 34Zenith Distance constraints "s": Sun < 120"t": Target > 65

Local Time:yyyymmdd 18 19 20 21 22 23 0 1 2 3 4 5 6

| | | | | | | | | | | | |20090901 ssssssssssssssssssssssssttttttttttttttttttttttttttttttt ssssssssss20090915 sssssssssssssssssssssstttttttttttttttttttttttttttt sssssssss20091001 ssssssssssssssssssstttttttttttttttttttttttt sssssss20091015 sssssssssssssssssstttttttttttttttttttt ssssss20091101 ssssssssssttttttttttttttt sssssssssss20091115 sssssssssttttttttttt ssssssssss20091201 ssssssssstttt sssssssss20091215 sssssssss ssssssss20100101 ssssssssss tttttsssssss20100115 sssssssssss tttttttttttsssssss20100201 sssssssssssss tttttttttttttttttssssssss20100215 ssssssssssssss tttttttttttttttttttttsssssssss20100301 sssssssssssssss ttttttttttttttttttttttttttssssssssss20100315 ssssssssssssssss tttttttttttttttttttttttttttttssssssssssss20100401 ssssssssssssssssssssssss tttttttttttttttttttttttttttttttttsssssssss

May 8, 2008 FUSP1 MIC WFF 14

36.173 Flight Events

Veh624Chute DeployVeh604Exp Power Off

10974.0121.8Exp495CCD Bias/ Dark74.0121.8Veh495Door Closed

584.7131.1Veh490Close DoorACS hold on target259287.9300.0Exp23124 ExposuresCenter by uplink command3286.3298.4Upl228On Target ζ TauACS Settled signal10180.5292.6Veh218Arrive ζ Tau

10273.6285.9Veh208Slew to ζ TauACS hold on target199150.0169.2Exp1088 ExposuresCenter by uplink command3144.8164.2Upl105On Target β TauACS Settled signal15116.9138.4ACS90Arrive β Tau

1586.8110.4Veh75Open Door63.188.5Veh64P/L Sep

5726.554.7Exp48CCD Bias/ Dark17.946.7Veh44BB Burnout

Safe for powered flightExp-5Safe54Exp-59CCD Bias/ Dark1Exp-60Clock Start

CommentDurLowAltSrcTimeEvent

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May 8, 2008 FUSP1 MIC WFF 15

Mission Success Criteria

Comprehensive 1) Vehicle: 1000 lb to 300 km apogee minimum 2) ACS: experiment LOS pointing error < 0.1°, updated

to < 1 arcmin; stability ±2 arcsec. 3) Experiment: data on both targets obtained. 4) Payload recovered in good shape.

Minimum 1) Vehicle: 1000 lb to 290 km apogee minimum 2) Experiment: data on one target obtained

May 8, 2008 FUSP1 MIC WFF 16

Schedule

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May 8, 2008 FUSP1 MIC WFF 17

Status - Design Analysis

Rev Date Description

A 28 Aug, 1997 Original. For PIC

B 20 Mar, 1999 Preliminary Design Review

C 2 Nov, 1999 Design Review; update success criteria, mass properties, event list, interface; include test startracker (ST3)

D 14 Jan, 2000 Changes from Design Review: door hinge; ST3 connector

E 2 June, 2006 Update to use MkIID ST5000 for main startracker (ST1) and for ZOD (ST2). Delete ST3. Add uplink requirements

F 5 May, 2008 Reorganize for re-MIC

Data Package History

Applicability of existing design analyses vehicle dynamics OK (mass properties unchanged) ACS: needs updating for change to ST5000 tracker Status of telemetry unknown

May 8, 2008 FUSP1 MIC WFF 18

Status - Structure

Skins: fabricated and delivered Structure:

telescope structure completed electronics section structure completed

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May 8, 2008 FUSP1 MIC WFF 19

Status - Optics/ Electronics

Experiment Optics & detector: delivered Spectrometer: preliminary

design Waveplate pressure fixture

under development

Experiment Electronics In development:

waveplate rotator CCD preamp

Primary in cell

Diamond brewster mirror Aberration-corrected grating