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WP8.1 UMI Tuner A. Bosotti, N. Panzeri, R. Paparella, F. Puricelli

WP8.1 UMI Tuner A. Bosotti, N. Panzeri, R. Paparella, F. Puricelli. Updates since the last CARE meeting: Life Time Test for PI-P889.90 Cryogenic calibration of a new force sensor CELMI 142-500 Progress on the Blade Tuner (presented by Nicola Panzeri). Piezo Life-Time Test 1/2.

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WP8.1 UMI Tuner A. Bosotti, N. Panzeri, R. Paparella, F. Puricelli

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  1. WP8.1 UMI TunerA. Bosotti, N. Panzeri, R. Paparella, F. Puricelli Updates since the last CARE meeting: • Life Time Test for PI-P889.90 • Cryogenic calibration of a new force sensor CELMI 142-500 • Progress on the Blade Tuner (presented by Nicola Panzeri)

  2. Piezo Life-Time Test 1/2 The purpose of this test is to investigate the behavior of piezoelectric ceramics in condition equivalent to 10 years of operation as actuator in active frequency tuner for ILC superconducting cavities (SC). To do this a Physik Instrumente PI P-888.90 PIC255 piezoelectric ceramic has been cooled down in LN2 and has been excited uninterruptedly for a month up to its limits, sustaining about 1.5x109 cycles of switching, up to nearly the maximum stroke, a good estimate of ten years as actuator for ILC cavities. Main features and parameters of the piezo Experimental apparatus block diagram Insert “functional” scheme

  3. Piezo Life-Time Test 2/2 Main piezo parameters checked Main features of the life time test Sensitivity @20kHz s = 149 mV/V/mm Hysteresis loops comparisons Solartron SM1 LVDT position transducer

  4. Cryogenic calibration of a new force sensor CELMI 142-500 1/3 Previous measurements have showed an unacceptable behavior of standard load cells when operated in a cryogenic environment. • Main problems were: • Glue: plastic deformations appears at low temperature. • Strain Gauge: high virtual load, high hysteresis. Results:Unacceptable lack of stability, uniformity and repeatability in the response As a consequence a custom load cell, manufactured by CELMI srl (Buccinasco, Italy), has been realized and tested in order to verify the performances of cryogenic-devoted sensitive elements (strain gauge & glue) • Main features: • Standard steel case (model 142), high transverse load resistance • Strain gauge and glue suitable for cryogenic applications CELMI load cell mod.142-500

  5. Cryogenic calibration of a new force sensor CELMI 142-500 - 2/3 The setup developed for previous load cell test has been used A stable liquid He T has not been reached because of the high heat transfer through the steel rod that exerts the force • P = 1.4 10-3 mbar • DUT T ranging from 6 to 15 K • > 4000 calibration points • 5 full range load sweeps, 0-200 kg

  6. Cryogenic calibration of a new force sensor CELMI 142-500 - 3/3 This new sensor can be calibrated with an acceptable error, the trend can be assumed to be:

  7. Conclusions • After about one month of operation in LN2 environment under extreme conditions, and after more than 1.5x109 oscillations driven between (nominal) operating voltage limits, the PI P 888.90 piezo is still working with almost the same characteristics. • The test on CELMI prototype has proved that the glue and strain gauge sensors used can work in LHe cryogenic environment with good repeatability and sensitivity. Future developments: • Realization of a new cell hosting the same sensitive elements but with the proper shape and reduced dimensions • Testing and calibration of the new cell with a more accurate DUT thermal stability - some solutions, already adopted for piezo tests, has been discarded due to the CELMI prototype size. • A new insert to perform more accurate tests on piezos and force sensors has been designed and is under construction.

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