Development of Alternative X-ray Optics

Webster CashPhil Oakley

University of Colorado&

Randy McEntafferUniversity of Iowa

LaunchedNovember 20, 2006November 13, 2009

Extended X-ray Off-plane SpectrometerEXOS

Optical Design:Wire-grid collimator & Off-plane Grating Array

Extended X-ray Off-plane Spectrograph

• 3.25° FOV + 3 m length = 6.7” opening aperture

• Wire grid collimator

• Off-plane grating array

• Gaseous Electron Multiplier (GEM) detectors

Wire-grid collimator

Off-plane grating array

α β

nλ/d

αγ

Off-plane Grating ArraySuitable for IXO

GEM Detectors(Now Baselined for a SMEX)

Collimator calibration

FWHM ~ 1.7 mm

“scatter” ~ 1%

Target: Cygnus Loop

Miyata et al. 2007

2007 Flight Spectrum

65 seconds, 2 features: 29 counts & 86 counts, 1.8 mm & 1.7 mm FWHM

Detector 0 ~ 40.14±2.39 Å, 43.89±1.96 Å

Detector 1 ~ 44.78±2.34 Å, 48.53±1.91 Å

Efficiency and Resolution TestingProblem has been adequate beam

and enough focal length

8m 8m

• Vacuum test facility at CASA/ARL•Based on a Maxim test facility

• Configuration can be changed for specific tests

OpticsDetectorX-ray source

swings

Optics TestingFirst Up: a Rigaku K-B Optic

8m 8m

• Vacuum test facility at CASA/ARL• Configuration can be changed for specific tests

KB mirrors

Detector

X-ray source

Rigaku K-B Optics

We will be characterizing a 1-D in the next few months

1-D 2-D

IXO Holographic Grating

8m 8m

• Vacuum test facility at CASA/ARL• Configuration can be changed for specific tests

KB spherical mirrorsRadial groove grating

Detector

X-ray source

Raytracing of Test Setup

Summary

• Off-plane Gratings now returning interesting x-ray spectra via rocketry

• New test facility coming on line

• Test of Rigaku Optic

• Test of IXO Holographic Grating

• IXO Grating Designs and Development– McEntaffer next – after coffee break