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Recent Work in Vibration Measurements at BNL

Recent Work in Vibration Measurements at BNL. Superconducting Magnet Division, BNL BNL-SLAC TeleConference: Feb. 7, 2005. Recent Activities. Preparations are underway to carry out vibration measurements in a RHIC quadrupole using a laser vibrometer.

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Recent Work in Vibration Measurements at BNL

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  1. Recent Work inVibration Measurements at BNL Superconducting Magnet Division, BNL BNL-SLAC TeleConference: Feb. 7, 2005

  2. Recent Activities • Preparations are underway to carry out vibration measurements in a RHIC quadrupole using a laser vibrometer. • Use of a dual-head vibrometer is planned to mitigate effects of laser head motion. • A fixture is designed and built to mount the fiber-optic laser heads on the cold test stand. • Vibration characteristics of the fixture are being studied using geophones. • A visit to PolyTec Inc. will be undertaken in the near future to gain some experience with the dual head vibrometer. BNL-SLAC TeleConference

  3. Laser Holder on the Test Stand UpperGeophone Holder Cold Mass Height Laser Head Holders Cryostat Height LowerGeophone Holder Rotation toAlign Laser Height/Tilt Adjustment BNL-SLAC TeleConference

  4. Laser Holder Adjustment Details Bolts to LockRotation Height/Tilt Adjustment BNL-SLAC TeleConference

  5. Very Low Frequency Motion of Large Plate ~150 mm motion at ~ 0.014 Hz (intermittent) BNL-SLAC TeleConference

  6. Horizontal Motion in “Laser” Direction BNL-SLAC TeleConference

  7. “Laser” Direction “Stiff” Direction BNL-SLAC TeleConference

  8. BNL-SLAC TeleConference

  9. Correlation Between Top & Bottom Plates Horizontal Motion in “Laser” Direction BNL-SLAC TeleConference

  10. Correlation Between Top & Bottom Plates Horizontal Motion in“Stiff” Direction BNL-SLAC TeleConference

  11. Summary of Laser Holder Measurements • Preliminary measurements suggest that the horizontal motion in the “Laser” direction is significantly more than the test stand. • Motion of the upper plate is more than the bottom plate. • Motion in the “stiff” direction is much less, indicating that the “Laser” direction needs to be stiffened. • Modifications are also needed to minimize the motion of the laser holder as a whole. BNL-SLAC TeleConference

  12. Plans for Dual Beam Vibrometer Tests • Shine the two beams from a dual beam laser vibrometer on two horizontal geophones placed near each other. • Compare relative motion derived from geophones data with that measured with the laser. • Repeat for geophone separation of about 30 cm. • Shake one of the geophones at a given frequency and compare the geophone and laser outputs. • Fixtures needed for the tests are being built. • Visit PolyTec Inc. in the next 2 weeks or so. BNL-SLAC TeleConference

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