S S R CS S R CS S R CS S R C O. Evdokov, B. Pirogov, B. Tolochko, I. Zhogin Institute of Solid State Chemistry and Mechanochemistry N. Gavrilov, A. Kosov, M. Sheromov, V. Tsukanov Budker Institute of Nuclear Physics A. Shmakov Boreskov Institute of Catalysis Compact Wave Strain-Friction reducers (0.3"–1.5" mini- goniometers) for X-ray optics at Siberian SR Center

Outline Introduction: the problem of precision rotation feedthrough into high vacuum and basics of Wave Strain-Friction (WSF) drive Design: WSF-reducers in drawings and in reality -- vacuum (CF63) and non-vacuum versions Parameters: testing WSF-reducers with encoder LIR-1170A (accuracy of 0.1 mdeg, or 0.36 arc sec) Applications: (1) single-crystal high-vacuum drum- type monochromator (where fast change of crystals is possible); (2) double-crystal high-vacuum fixed- exit monochromator Conclusion and Acknowledgments

Introduction Feedthrough of precision motion (rotation) into high vacuum is a difficult problem (high vacuum mechanics is expensive) a)viton sealing and differential pumping b)piezoceramics c)strain & friction mechanics – most simple way (N Gavrilov) ABC of Wave Strain-Friction (WSF) drive Outer rigid ring Inner flexible ring Wave generator Elastic deformations, D – inner diameter of outer ring d – outer diameter of inner ring k – coefficient of reduction – elastic deformations k k0k0

Design WSF-reducers in drawings: vacuum (CF63) and non-vacuum versions stepper … and in reality

Parameters Testing WSF-reducers with encoder LIR-1170A encoder stepper 0.9 ° (0.45°) period ~ 650 h-steps h-step ~ 0.32±0.35 period ~ 800/3 h-steps period ~650 steps step ~ 0.33 vacuum variant

Applications Single-crystal high-vacuum drum-type monochromator (design: E.I. Pokhlebenin ) Ion chamber Monochromator 2 = 30 ° Si 111 – 7.64 keV Si 220 – keV

Single-crystal high-vacuum drum-type monochromator installed on 6-th beam-line Ion chamberMonochromator

Applications Double-crystal high-vacuum fixed-exit monochromator ( design: N.G. Gavrilov, I.L. Zhogin ) C1 - the first crystal; C2 - the second crystal (Si 111 or 311) 3 - horizontal (Huber) stage (working range of ~190 mm) 4 - bellows; 5 - plunger-rod (with tubes for water cooling of the first crystal); beam offset is h=40 mm; range of energy (Si111) 5–19 keV; L1, L2 - levers clamping to their rollers R1 and R2; Li-lever rotates Ci-crystal SRI-03 proc., p. 691

Laser Ruler & webcam (~10m path to ruler) Optical testing kinematics of monochromator in vacuum

Kinematical part of the double-crystal high-vacuum monochromator (optical testing in air)

WSF-reducer Beam testing DC-monochromator Ion chamber

Fine (de)tuning of the first crystal Correlation of two rock.curves (autocorrelation; XOP) 1 h-step ~ 0.03 ( DShI steps/rot.) time, s (x 50 half-step/s)

Plan view 0 Explo- sion (bunker VEPP-3) Mono1 New top station Mono2 ?

Conclusion WSF-reducers are a good choice (compact and inexpensive) for a feedthrough of precision rotary motion into high vacuum (or other environment) their performance can be improved by increasing the diameters of rings (and with better manufacturing) to be continued later

Acknowledgements Grants: Russian Foundation for Basic Research (N Gavrilov) Bortnik Foundation (A Shmakov, B Tolochko) SSRC Users and staff: Thanks for tolerance and assistance Audience: Thank you for your attention