CPSHR – Cryo Positioning Stage High Resonance

An xyz stage combining parallel kinematics and CLA technology for extremely stable cavity measurements
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Product description

The Cryo Positioning Stage High Resonance (CPSHR) is a XYZ positioning stage developed for use in a cryo-vacuum environment. Parallel kinematics result in a light and stiff stage with very high internal resonance frequencies, making it less sensitive to floor vibrations (read our application note on Cavity Stability Measurements). The CPSHR1 is the most compact design with small stroke and high resonances. The CPSHR2 has large stroke and improved thermal conductivity but lower resonances. The CPSHR3 combines the best of both worlds with large stroke, further optimized thermal conductivity and high resonances.

Active axes-3
Type of motion-x, y, z with parasitic RxRy
System Range *mm^3approx. 1x1x1approx. 10x10x4approx. 8x8x4
System scan range @4Kµm^3approx. 1x1x0.5N/Aapprox. 10x10x1.6N/Aapprox. 10x10x1.6N/Aapprox. 8x8x1.6N/Aapprox. 8x8x1.6
Parasitic angle from xy strokemrad/mm201417
Coarse actuator-CLA2201CLA2601
Scanning actuator-Piezo ceramicN/APiezo ceramicN/APiezo ceramicN/APiezo ceramicN/APiezo ceramic
Endstops **-at z -0.5mmat z -3mm and z +3mm
Main construction material-TitaniumPhosphor Bronze (improved thermal conductivity, lower resonances)Aluminium (optimal thermal conductivity, high resonances)
1st natural frequencykHzxy:1.5 / z:4,0xy: 1.2 / z: 2.2xy: 0.55 / z: 2.2xy: 1.2 / z: 2.2xy: 0.55 / z: 2.2xy: 2 / z: 3.7xy: 1.5 / z: 3.7xy: 2 / z: 3.7xy: 1.5 / z: 3.7
Specifications are given for individual actuators unless otherwise mentioned. See interface drawing for transformation matrix from actuator outputs to system motion
Coarse rangemm± 0.5± 3
Scan range @ 293 Kµm2.5N/A8N/A8N/A8N/A8
Scan range @ 4 Kµm0.5N/A1.6N/A1.6N/A1.6N/A1.6
Coarse step size @ 293 Knm5-25
Coarse step size @ 4 Knm1-5
Scanner sensitivity @ 293 Knm/V25N/A66N/A66N/A66N/A66
Scanner sensitivity @ 4 Knm/V5N/A13N/A13N/A13N/A13
Load capacitygrams100200
Operating temperatureK0.8-3750.02-3751.5-375
Massgrams300 12301450510570
Coarse actuator spindle pitchmm/turn0.25
Coarse actuator encoder resolution ***PPRN/AN/A850N/A850
Controller/driver-CAB-230(115), CADM(2), MCM
Encoder readout-N/AN/AOEM2N/AOEM2
* Typical volume for positioning. Due to the parallel kinematics the indicated max values are not necessarily simultaneously achievable. On the other hand max values can be bigger when strokes along other axes are limited.
** Endstops are placed close to, but not coincident with each actuator motion axis. Together they define a system z-position, with x and y being 0. Touching multiple endstops in an uncontrolled manner with x and y not being 0 can cause the system to jam and could require manual action to free it.
*** Linear resolution can be found by dividing the spindle pitch by PPR (pulses per revolution)
**** Specified scan ranges assume use of CADM2 -20V to +130V, 10 bits resolution, setpoint rate approx. 10Hz. Alternative: PSM amplifier with PSMIL -20V to +130V. By disconnecting the PSMIL high voltage bipolar operation is possible to increase the range. This is only allowed at cryogenic temperatures and -120V to +120V is not to be exceeded!

The COE (Cryo Optical Encoder) is a fiber based optical encoder that can be added to selected positioners for position feedback. It works by illuminating a grid and detecting high/low intensity transitions from features in the grid. Resolution is determined by the pitch of these features. It is an incremental encoder, which means that it will reset to “zero” at a power shutdown. The COE requires the OEM electronics module as light source and position readout. More info can be found in the Downloads section.

HV rated positioners can realistically be considered compatible with pressures as low as 1E-8 mbar. Lower pressures can be achieved by prolonged baking of positioners in vacuum at 100-150 deg C, depending on the type of positioner. Upon request JPE can provide such service at additional costs.

CPSHR1-S /HV: Cryo Positioning Stage High Resonance 1-Scanner
CPSHR2 /HV: Cryo Positioning Stage High Resonance 2
CPSHR2-S /HV: Cryo Positioning Stage High Resonance 2-Scanner
CPSHR2-COE /HV: Cryo Positioning Stage High Resonance 2-Cryo Optical Encoder
CPSHR2-S-COE /HV: Cryo Positioning Stage High Resonance 2-Scanner-Cryo Optical Encoder
CPSHR3 /HV: Cryo Positioning Stage High Resonance 3
CPSHR3-S /HV: Cryo Positioning Stage High Resonance 3-Scanner
CPSHR3-COE /HV: Cryo Positioning Stage High Resonance 3-Cryo Optical Encoder
CPSHR3-S-COE /HV: Cryo Positioning Stage High Resonance 3-Scanner-Cryo Optical Encoder

How It Works

27 Point Scan Pattern Using Position Control

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