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ES-SXR EDGE SPECTROGRAPH

bulletErect Field: Small Flat Detection Surface
bulletGrazing Incidence: Soft X-Ray/EUV/FUV
bulletVLS: High Spectral Resolution
bulletFixed Optics: Robust Stability
bulletAstigmatic: High Throughput, Compact
bulletMonochromator Conversion (optional)

OPTO-MECHANICAL DESIGN

A grazing incidence varied line-space (VLS) diffraction grating provides a normal incidence spectrum, allowing efficient use of CCD and other detectors. The Edge Spectrograph is an astigmatic, fixed-optic design, derived from initial applications of analyzing K-edges of Silicon and Oxygen for CCD characterization and those of Aluminum and Oxygen for thin-film filter calibration. There are no feedthrough adjustments of the optics, resulting in a simple, low-cost design.  Each grating is mounted to a dedicated vacuum flange which is exchanged at atmosphere to select the desired spectral region. Fine-tuning of the spectral focus is achieved by the user adjusting his point source position. Alternatively, an optional entrance slit assembly provides a micrometer feedthrough positioning adjustment of the slits, for use with an extended source. Four manually-adjustable honed knife-edges at the entrance port of the optics chamber define the illuminated aperture, and one knife-edge is placed at the position of minimum confusion above the focusing mirror to reduce stray light. The aluminum optics chamber s supplied with mounting legs which can be bolted directly to an inch-spacing threaded hole(1/4-20) user-supplied breadboard. The user also provides a light source and detector (such as a CCD) with their connecting nipples to the optics chamber, and vacuum pumps/gages.

The spectrograph includes 4 gratings (SA/SB/SC/SD or A/B/C/D), each mounted on a dedicated IFC114 knife-edge flange with engraved nameplate and gasket-sealed storage cylinder.

The erect spectrum orientation enables a simple monochromator conversion by adding an exit slit assembly (model VSA-200) translating (75 mm) on an atmospheric crossed-roller manual stage (w/mounts and dial indicator readout), welded bellows nipple coupling to the optics chamber and mounting brackets for horizontal dispersion. Combined with grating set SA/SB/SC/SD, this VUV workhorse provides selection to over two decades in wavelength (6 ~ 2000 Angstroms) covering the soft x-ray, extreme UV and far UV spectral regions. Absolute efficiency-calibrated gratings SA, SB, SC, A, B and C are optional (see Examples); otherwise no representation is made of efficiency.

ES-SXR SPECIFICATIONS

Mounting Hettrick, VLS plane grating
Angle-of-Incidence(Alpha) 87.25° (gratings A/B/C/D)
88.75° (SA/SB/SC/SD)
88.00° (focusing mirror)
Replica Grating Format Gold surface, 62X15 mm
Mirror Format Gold surface, 50 0r 100 mm
Vacuum Chamber 9 inch X 6 inch X5.5 inch, plus legs [Weld-free electroless nickel plated 6061 aluminum]
Vacuum Compatibility 10^-8 torr
User ports Teflon gasket-sealed knife-edge flanges = ICF63(3), ICF114(1)
Weight 12 kg
Source - focal plane 1.75 meters
Meridional Aperture 3.8 mrad (gratings A/B/C/D)
1.75 mrad (SA/SB/SC/SD)
Sagittal Aperture 15 mrad (astigmatic)

GRATING BAND SPECIFICATIONS

g/mm Wavelength Order @source @focal plane
A 600 15Å outside 1.0Å/mm ~0.5Å/mm
SA 600 15Å inside 0.5Å/mm ~1 Å/mm
B 200 45Å outside 3Å/mm ~1.5Å/mm
SB 200 45Å inside 1.5Å/mm ~3Å/mm
C 66.66 135Å outside 9Å/mm ~4.5Å/mm
SC 66.66 135Å inside 4.5Å/mm ~9Å/mm
D 22.22 405Å outside 27Å/mm ~13.5Å/mm
SD 22.22 405Å inside 13.5Å/mm ~27Å/mm

About 5MB introductory documents are as follows:

First page

Second page

 



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