\newif\ifdraft
\def\draft{\drafttrue}

%\draft

\ifdraft
\magnification=1000
\def\newp{\hrule}
\else
\magnification=2880
\def\newp{\vfill\eject}
\vsize=7.0truein
\hsize=10truein
\voffset=-0.75truein
\hoffset=-0.5truein
\fi

\input six.tex
\input eight.tex
\input insfigv.tex
\input insfigw.tex
\input ttable.tex

\def\ixa{\medskip\noindent $\bullet$ }
\def\ixap{\medskip\noindent \phantom{$\bullet$} }
\def\ixb{\item{}-}
\def\ixbp{\item{}\phantom{-}}


%\footline{\hfill Jesper Schou}

\raggedright
%\nopagenumbers

\centerline{\bf Instrument Performance and Requirements}

\bigskip

\centerline{Jesper Schou}
\medskip
\centerline{Stanford University}
\medskip
\centerline{jschou@solar.stanford.edu}
\medskip
\centerline{(650) 725-9826}

\bigskip

\ixa Observing scheme

\ixa Instrument requirements

\ixa Instrument top level description

\newp

\centerline{\bf Observing Scheme}

\medskip

\ixa Observables

\ixb Dopplergrams

\ixb LOS magnetograms

\ixb Vector magnetograms

\ixb Intensity images

\ixb Etc.

\ixa Observables made from filtergrams

\ixb Ground processing only

\ixb Allows for calibration

\ixb Allows for reprocessing, if needed

\ixb Low complexity

\ixb High data rate

\newp

\ixa Filtergram properties

\ixb Wavelength

\ixb Polarization state

\ixb Camera, observing mode, exposure time, ...

\newp

\ixa Framelists

\ixb Basic list repeated during normal operations

\ixb 45s Doppler / 90s magnetic

\ixb Data from two cameras not combined

\ixb Options for \# wavelengths

\ixb Options for polarization scheme

\insfigv{1}{framelist.eps}{}

\newp

\centerline{\bf Instrument Requirements}

\bigskip

{Observable requirements}

{~~~~~~~~~~~~~~$\Downarrow$}

{Filtergram requirements}

{~~~~~~~~~~~~~~$\Downarrow$}

{Instrument requirements}
{$\Leftrightarrow$}
{Spacecraft requirements}

%\bigskip
%
%\ixa Requirements vs. goals vs. design
%
%\ixa Not independent
%
%\ixa Different options
%
%\ixa Some still TBD
%
%\ixa Instrument vs. spacecraft numbers

\newp

\centerline{\bf Requirements Traceability}

\bigskip

\centerline{General Requirements}
\nobreak
\input thead.tex
&Angular resolution:&&Angular resolution:&&Aperture: 14cm &\cr
\sepone
&1.5(1)"&&1.5(1)"&&Jitter: 0.1" &\cr
\septwo
&&&0.5" pixels&&CCD pixels:&\cr
\septwol
&Full disk&&FOV: 2000" x 2000"&&4096$^2$&\cr
\septhree
&99\% complete 95\% time&&99.99\% complete 95\% time&&Packet loss: 0.01\%&\cr
\input ttail.tex

\medskip

\centerline{Continuum intensity}
\nobreak
\input thead.tex
&Cadence: 50(45)s&&I framelist: 50(45)s&&CCD readout &\cr
\noalign{\hrule}
&Noise: 0.3\%&&Intensity noise: 0.3\%&&Full well: 125ke$^-$&\cr
\noalign{\hrule}
&Pixel to pixel accuracy: 0.1\%&&Flat field knowledge&&Offset pointing&\cr
\input ttail.tex

\vfill
{\sixpoint\noindent Numbers in () are goals. $^*$indicates TBD. Most numbers are 1$\sigma$.}

\eject

\medskip

\centerline{Velocity requirements}
\nobreak
\input thead.tex
&Cadence: 50(45)s&&V framelist: 50(45)s&&CCD readout &\cr
\noalign{\hrule}
&Noise: 25(13)m/s&&Intensity noise: 0.6(0.3)\%&&Full well: 30(125)ke$^-$&\cr
\septwo
&&&Filter width: 76 m\AA&&Element widths&\cr
\septwo
&&&Small sidelobes&&7 elements&\cr
\sepone
&&&&&Element widths&\cr
\noalign{\hrule}
&Disk averaged&&$\lambda$ repeatability: 0.3(0.03)m\AA&&HCM repeatability:&\cr
\sepzero
&noise: 1(0.1)$^*$m/s&&&&60(6)"&\cr
\septwo
&&&Exposure knowledge:&&&\cr
\sepzero
&&&200(20)ppm&&Shutter: 50(5)$\mu$s&\cr
\septwo
&&&Each cycle same $\lambda$'s&&Two cameras&\cr
\septwo
&&&Effective $\lambda$ knowledge:&&Orbit info&\cr
\septhree
&Absolute: 10$^*$m/s&&$\lambda$ accuracy: 3m\AA&&HCM accuracy: 10'&\cr
\sepone
&&&&&Filter uniformity, drift&\cr
\septhree
&Range: $\pm$6.5km/s&&Tuning range: $\pm$250m\AA&&3 tuned elements&\cr
\septwo
&(and $\pm$3kG)&&Filtergrams @ 5 or 6 $\lambda$&&CCD readout&\cr
\input ttail.tex

\medskip

\centerline{Line of sight field requirements}
\nobreak
\input thead.tex
&Cadence: 50(45)s&&LOS framelist: 50(45)s&&CCD readout &\cr
\septwo
&&&LCP+RCP each cycle&&LCP+RCP available&\cr
\septhree
&Noise: 17(10)G&&Intensity noise: 0.5(0.3)\%&&Full well: 40(125)ke$^-$&\cr
\septwo
&&&High effective Lande g&&FeI 6173\AA\ (g=2.5)&\cr
\noalign{\hrule}
&Zero point: 0.3(0.2)G&&$\lambda$ repeatability:&&HCM repeatability:&\cr
&&&0.18(0.12)m\AA&&36(24)" or&\cr
&&&&&No move LCP$\leftrightarrow$RCP&\cr
\septwo
&\omit&&Exposure knowledge:&&&\cr
\sepzero
&\omit&&120(80)ppm&&Shutter: 30(20)$\mu$s&\cr
\septhree
&Range: $\pm$3(4)kG&&Tuning range: $\pm$250m\AA&&3 tuned elements&\cr
\septwo
&(and $\pm$6.5km/s)&&Filtergrams @ 5 or 6 $\lambda$&&CCD readout&\cr
\input ttail.tex

\medskip

\centerline{Vector field requirements}
\nobreak
\input thead.tex
&Cadence: 600(90)s&&Vector framelist: 600(90)s&&CCD readout &\cr
\septwo
&&&4 states each cycle&&4 states available&\cr
\septhree
&Polarization: 0.3(.22)\%&&Intensity noise: 0.4(0.3)\%&&Full well: 70(125)ke$^-$&\cr
\input ttail.tex

\newp

\centerline{\bf Instrument Performance Document}

\smallskip

\ixa Purpose

\ixb Capture derivations

\ixb Internal tests and calibration

\ixa HMI overview

\ixb Science and instrument overview

\ixb Observables requirements (Doppler, magnetic, ...)

\ixa Observables to filtergram flow

\ixb Details of derivations

\ixb Derived requirements (pixel size, filter width, ...)

\ixa Filtergram to instrument flow

\ixb Details of derivations

\ixb Derived requirements for each subsystem

\newp
\insfigv{2}{filtersc.ps}{}

\newp

{
\ifdraft
\else
\vsize=8.5truein
\hsize=11.000truein
\hoffset=-1.0truein
\voffset=-1.0truein
\fi
%\insfigv{2}{instrument.ps}{}
%\insfigw{2}{optics1.ps}{}
\insfigw{2}{optics2.ps}{}
}

%\newp
%\insfigv{2}{sigmav.ps}{}


\end

