Download LXO-Hardware

Telescope Baseline Configuration:
• Imaging Capability (Micropore Optic)
• Telescope Field of View ~ 30° x 30°
• Angular Resolution ~ 1.5 arcminutes
• Detector Pixel Size < 200 μm
• Detector Energy Range ~ 0.2 to 2.0 keV
• Detector Resolution ~ 50 eV FWHM @ 600 eV
• Detector Geometric Area ~ 13 cm x 13 cm
• Total Instrument Mass ~ 20 – 40 kg
• Instrument Power ~ 20W operational, 2W standby
LXO/MagEX Meeting
Greenbelt, 24/10/07
Micropore Optics, Leicester Heritage:
Optics manufactured to our specification by Photonis (France)
Mercury Imaging X-ray Spectrometer (MIXS) (BepiColombo, ESA)
PI George Fraser (SRC, Leicester)
Status: funded, launch 2013
Wide-Field Auroral Imager (WFAI) (KuaFu, Chinese)
PI Mark Lester (RSPP, Leicester)
Status: proposed, launch ~ 2012
Lobster-Eye Wide-Field Telescope (LWFT) (Spectrum-RG, Russian)
PI George Fraser (SRC, Leicester)
Status: proposed, launch ??
LXO/MagEX Meeting
Greenbelt, 24/10/07
MIXS-T relatively narrow fov ~ few (TBD) degrees
LXO/MagEX Meeting
Greenbelt, 24/10/07
LWFT Prototype Support Structure (left)
LXO/MagEX Meeting
Greenbelt, 24/10/07
LWFT Optic Characteristics
• Focal length = 37.5 cm
• Radius of curvature = 75 cm
• Channel cross-section = 20 µm
• Channel array pitch = 24 µm
• Channel length (MCP thickness) = 1 mm
• MCP size (one plate) = 4 cm x 4 cm
• Channel coating ~ 200 Å Ni
• Support Structure Material = Beryllium Alloy
• Optic Mass ~ < 1 kg
LXO/MagEX Meeting
Greenbelt, 24/10/07
Detector Plane
Detector plane geometric area is half the optic geometric area
LXO/MagEX Meeting
Greenbelt, 24/10/07
Optic and Detector Geometrical Area for FOV & Focal Length
Optic
RC
50.0
FL
25.0
20°
30°
40°
17.5
26.2
34.9
75.0
37.5
26.2
39.3
52.4
100.0
50.0
34.9
52.4
69.8
Optic
(cm)
Area
50.0
25.0
8.7
13.1
17.5
75.0
37.5
13.1
19.6
26.2
100.0
50.0
17.5
26.2
34.9
LXO/MagEX Meeting
Greenbelt, 24/10/07
~ 170 cm2
Detector
~ 380 cm2
(cm)
EPIC-MOS detector plane:
7 x 2.5 cm x 2.5 cm CCDs; Total Geometric Area ~ 44 cm2
Devices, FI MOS CCDs, manufactured by E2V (was EEV)
LXO/MagEX Meeting
Greenbelt, 24/10/07
Large Area focal plane detectors now common in Optical applications
Gaia (ESA)
Cost ~ 50-100 K Euro/Unit
focal plane array (E2V devices)
LXO/MagEX Meeting
Greenbelt, 24/10/07
Large Area Detector (LAD) Program for X-ray Applications
Research joint funded by UK industry (E2V) and PPARC
Application in this case was X-ray macromolecular crystallography
5.5 cm x 4.1 cm active area, 3.2M pixel, 27 µm, 2 MHz pixel readout,
Device is 3-sides buttable
LXO/MagEX Meeting
Greenbelt, 24/10/07
Hamamatsu CCD….BI device, 6.69 cm x 3.15 cm, 4-sides buttable
Designed for proposed
HyperSuprime Camera on
Subaru
Focal plane array has 176 CCDs
Readout is 130 k pixel s-1 readout, so to read out full frame of 2k x 4k
pixels would take ~ 64 s !
On-board binning to 150 µm pixels (~ 2 arc minute on sky) allows
Minimum readout time of 0.64 s (not counting overhead, ~ factor of 2)
Max source count rate ~ 0.8 cts / kilosecond /pixel
LXO/MagEX Meeting
Greenbelt, 24/10/07
CCD arrangement on Focal Plane ?
PSF Optimum
Centre FOV
PSF Optimum
Outer FOV
PSF Optimum
Across FOV
LXO/MagEX Meeting
Greenbelt, 24/10/07
Bottom-line Detector Issues…to be solved
Technical Issue:
Power
How many CCDs can we operate within
the power budget?
Project Issue (assuming technical solution):
Development Cost
Can we use “off-the-shelf CCDs?”
LXO/MagEX Meeting
Greenbelt, 24/10/07