WEPH19
SLAC, Menlo Park, California, USA
THOPMA05
SLAC, Menlo Park, California, USA
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WEPH19 |
Positioning Behavior of a Lead-Screw Type In-Vacuum Actuator | |
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| In-vacuum actuators are under consideration for operating the bending flexturs of the new Kirkpatrick-Baez focusing mirrors as part of the upgrade to LCLS-II. To achieve an mechanical accuracy of better than 104, the characteristics of the actuators need to be explored. We designed a testing procedure in terms of both setup and actuator excursion program to understand various behaviors of the actuator in a simulated typical operating condition. Multiple independent sensors were used, including optical linear encoder, laser interferometer and capacitive sensors. In this presentation, I will show the testing procedure and results obtained for a commercially available high-precision leadscrew type in-vacuum linear actuator with a stroke of 10 mm and a resolution of 2.5 nm. It was found that under typical static operation conditions, an accuracy of 104 can be achieved without external encoder feedback. Detailed behaviors regarding repeatability and backlash are also discussed. | ||
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THOPMA05 |
Using Resistive Element Adjustable Length (REAL) Cooling to Increase Optical Design Flexibility in High Power XFELS | |
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| With the onset of high power XFELs and diffraction limited storage rings, there is a growing demand to maintain sub nanometer mirror figures even under high heat load. This is a difficult issue as the optimum cooling design for an optic is highly dependent on the power footprint on the mirror, which can be highly dynamic. Resistive Element Adjustable Length cooling can be utilized to change the cooling parameters during an experiment to adapt for changing beam parameters. A case study of the new soft x-ray monochromator for the LCLS L2SI program is presented that utilizes this new capability to allow the beam to translate across the mirror for different operation modes, greatly simplifying the monochromator mechanics. | ||
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Slides THOPMA05 [22.095 MB] | |
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