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Test on mirror support prototypes. M. Lenti. News from MARCON. Shipping at CERN of all the mirrors : end of 2010 – beginning of 2011 4 dummy segments ordered to be shaped and drilled as the mirrors ( without any optical threatment ) for our testing. Encoders.

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news from marcon
News from MARCON
  • Shipping at CERN ofall the mirrors: end of 2010 – beginningof 2011
  • 4 dummysegmentsorderedtobeshaped and drilledas the mirrors (withoutanyopticalthreatment) forourtesting

M.Lenti

encoders
Encoders

NANOS InstrumentsGmbH

EncodersdevelopedforPiezoMotor

Twopiecesordered

M.Lenti

leaf springs
Leaf Springs

piezo

  • Full prototyperealized
  • “leafsprings”: mirrorhungthroughtwoholes
  • Mirrormovementaround x and y axis
  • pulled at 0 and 90 degrees
  • Mirrorweight: counterbalanceforverticalmovement
  • Leafsprings: counterbalanceforhorizontalmovement
  • Piezo-motor (final) used
  • 0.25 mm thickaluminiumribbon (directtraction, no 90 degdeviation); l=250mm

piezo

dowel

dowel

dowels

Leafsprings

piezo

dowel

M.Lenti

leaf spring prototype
LeafSpringPrototype
  • For the horizontal plane (actuated by the leaf spring) the "zero" with the ribbon mounted was with a 12 mrad angle deviation with respect to the "free" situation(no horiz ribbon fixed).
  • I measured this both from the displacement at the ribbon fixation point and from the displacement of the laser spot on the photodiode.
  • The force to be exerted to bring all the stuff in the horiz. "zero" position is 60 g (or 0.6 N) measured with a dynamometer; the force is roughly linear with the observed displacement of the laser spot on the photodiode.
  • Use both an aluminum hexagon and a true glass mirror (pre-series mirror are with two holes in the back, lacking the central one)
  • Reduce step size by a factor 5 w.r.t. last meeting

M.Lenti

leaf spring prototype1
LeafSpringPrototype

Fromonepointto the next: 20 microstepmovementsof the Piezo (6.25 μm)

Aluminumhexagon

Glass mirror

Spot position on the Photodiode

65 μm

65 μm

50μrad

50μrad

50μrad

50μrad

Aluminumhexagon

dist. Mirror-phtdiode: 700 mm

Glass Mirror

Dist. Mirror-phtdiode: 770 mm

M.Lenti

single dowel prototype
Single DowelPrototype
  • Put the actuating ribbons “parallel”
  • “twist” the actuating ribbons (90 degree from the segment to the piezo)
  • Use a third ribbon for θZstabilization
  • Reduce stepsizeby a factor 5

M.Lenti

single dowel
Single dowel

piezo

piezo

  • Full prototyperealized
  • “single dowel”: mirrorhung at the center
  • Mirrormovementaround u and v axis (insteadof x and y)
  • pulled at ±45 degrees (axisdecoupling)
  • Mirrorweight: counterbalanceforbothmovements
  • Piezo-motor (final) used
  • 0.25 mm thickaluminiumribbon (directtraction, no 90 degdeviation), 13 mm wide

dowel

dowel

stabilizer

piezo

dowel

M.Lenti

single dowel1

Ribbons are parallel

Twistedribbon

Twistedribbon

Single Dowel

The stabilizerribbonisfixed

on the bottom corner of the

Hexagon and at 500 mm on the

right (availablealso on the left

butnotused)

Actuatingribbonsjoints on the

Hexagonmadehorizontalusing

a level

fixed

free

fixed

θZstabilizer

θZstabilizer

θZstabilizer

M.Lenti

single dowel prototype1
Single dowelprototype

Fromonepointto the next: 20 microstepmovementsof the Piezo (6.25 μm)

Piezoribbon joint on the hexagon: 300 mm from the dowel

6.25 μm/300 mm = 21μrad

16.11.2010

17.11.2010

Aluminumhexagon

65 μm

65 μm

50μrad

50μrad

50μrad

50μrad

Spot position on the Photodiode

Aluminumhexagon: dist. Mirror-phtdiode: 700 mm

40 μm on the photodiode 0.5*40 μm/700 mm = 28 μrad

M.Lenti

conclusions
Conclusions
  • Bothapproaches (leafsprings and single dowel) tested
  • Twoencodersordered
  • 4 Dummyglassmirrorsordered

M.Lenti