Polarimeter update - public.asu.edudugger/9-19-2014.pdf · optical switch • Vacuum rated down to...
Transcript of Polarimeter update - public.asu.edudugger/9-19-2014.pdf · optical switch • Vacuum rated down to...
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Mike and Brianna
Polarimeter update
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Old design of internal elements
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Converter tray (position: retracted)
Tray allows up to 4 converters
Mounting plate
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Converter tray (position: 1)
• Tray 1: wire
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Converter tray (position: 2)
• Tray 2: beryllium 35 μm
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Converter tray (position: 3)
• Tray 3: beryllium 70 μm
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Converter tray (position: 4)
• Tray 4: thin carbon
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With optical limit switches
• Transfer Engineering
optical switch
• Vacuum rated down to
10-11 Torr
Will use different
limit switches
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Motor • Manufacturer: Phytron
• Vacuum rated to 7.5 x 10-12 torr
• Radiation resistant to 106 J/kg (~3x1018 MeV over
lifetime of ½ kg motor)
• Holding torque: 33 oz-in
• Cost: $5756 (with resolver, and resolver-encoder
converter)
42 mm 69 mm 16 mm 15 mm
Mass = 0.52 kg
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With motor
Note: The teeth on the
gear and rack are not
shown
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With motor mount
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With rack guide
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With rack guide supports
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With detector supports
Building test rail with guide
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• Made miniature rail and guide to
test our basic design and
machining capabilities
• Note: mock up of rail does not
have teeth
• Actual rail we have ordered
Final result
Relative placement of position
system components
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• Motor shown is not the one
that will be used in the
vacuum
• Vacuum rated motor is
about twice as long, but
other dimensions are the
same
• Do not see any conflicts in
the placement of elements
Other developments
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• Finished the power distribution box design
• Still waiting on Methanol (for cleaning chamber surfaces)
• Attached KF-25 fittings to VisiTrap
• Power poles have arrived
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Distribution box: front
• The front of the distribution box supplies voltages to the preamps
• Four preamps and each has a +12 V and -12 V input
• One of the preamps will have a high voltage input
Holes for mounting screws
SMA
SMA
BNC
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Distribution box: right side
SHV
high voltage input
Ethernet
to
Arduino
USB
to
Arduino
D-sub connector
from chamber
(motor controls
and limit switches)
FAN: Right
Red: +12V
Green: Ground
Yellow: Tachometer
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Distribution box: left side
D-sub connector
pass-through
to outside world
FAN: Left
Red: +12V
Green: Ground
Yellow: Tachometer
Low voltage in
Red: +12V
Black: -12V
Green: Ground
Purple: Sense wire (+12 V)
Blue: Sense wire (-12 V)
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Next
• As parts come in we continue to build!