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Vibration Measurement at ATF2

Vibration Measurement at ATF2. R. Sugahara (KEK) Measured on 17 and 30 June 2008. X. North. Y. West. Layout. QF17X. QM12FF. Instruments. Seismometers MG-102S of Tokkyokiki Corporation (Accelerometer) Sensible frequency region: 0.1 - 400Hz

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Vibration Measurement at ATF2

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  1. Vibration Measurementat ATF2 R. Sugahara (KEK) Measured on 17 and 30 June 2008

  2. X North Y West Layout QF17X QM12FF

  3. Instruments Seismometers MG-102S of Tokkyokiki Corporation (Accelerometer) Sensible frequency region: 0.1 - 400Hz Resolution: 0.1mGal (Gal = cm/sec2) Sensitivity: 1 Gal/V Data logger Graduo of Ono Sokki Co., Ltd.

  4. I On concrete blocks

  5. 1-1 Concrete Block (---) versus Floor (---) PSD (Power Spectrum Density) 10-4 X (N-S) Y (W-E) V 10-8 PSD (mm2/Hz) 10-12 0.1 1 10 100 0.1 1 10 100 0.1 1 10 100 Frequency (Hz)

  6. 1-2 Concrete Block (---) versus Floor (---) Integrated PSD X (N-S) 10-3 Y (W-E) V Integ. PSD (mm) 10-6 0.1 1 10 100 0.1 1 10 100 0.1 1 10 100 Frequency (Hz)

  7. 1-3 PSD Ratio Concrete Block / Floor QM12 Frequency (Hz)

  8. II On magnet without mover

  9. 2-1 QF17X (---) versus Floor (---) PSD (Power Spectrum Density) 10-4 X (N-S) V Y (W-E) 10-8 PSD (mm2/Hz) 10-12 0.1 1 10 100 0.1 1 10 100 0.1 1 10 100 Frequency (Hz)

  10. 2-2 QF17X (---) versus Floor (---) Integrated PSD X (N-S) 10-3 Y (W-E) V Integ. PSD (mm) 10-6 0.1 1 10 100 0.1 1 10 100 0.1 1 10 100 Frequency (Hz)

  11. 2-3 PSD Ratio QF17X (no mover) / Floor (---) Frequency (Hz)

  12. III On magnet with mover

  13. 3-1 QM12 (---) versus Floor (---) PSD (Power Spectrum Density) 10-4 X (N-S) Y (W-E) V 10-8 PSD (mm2/Hz) 10-12 0.1 1 10 100 0.1 1 10 100 0.1 1 10 100 Frequency (Hz)

  14. 3-2 QM12 (---) versus Floor (---) Integrated PSD X (N-S) 10-3 Y (W-E) V Integ. PSD (mm) 10-6 0.1 1 10 100 0.1 1 10 100 0.1 1 10 100 Frequency (Hz)

  15. 3-3 PSD Ratio QM12 (with mover) / Floor QM12 Frequency (Hz)

  16. Summary 1. On the concrete base block • Amplification factor is quite small in the frequency region less than 40Hz, especially in vertical direction 2. On the top of the magnet without mover, QF17X • There are resonances at 35Hz in X direction, and at 55Hz in Y • No obvious resonance is observed in V direction • Amplification factor is about 100 in amplitude at X and Y resonance peaks • Out of resonance region, amplification factor is about 3 or less in the frequency region higher than 15Hz in X and Y direction • Amplification factor is less than 2 in the frequency region less than 15Hz. Especially it is quite small in V direction in the frequency region less than 50HZ

  17. Summary (cont.) 3. On the top of the magnet with mover, QM12FF • There are resonances at 20Hz in X and Y direction, and at 70Hz in V • Amplification factor is about 100 in amplitude at resonance peaks • Out of resonance region, amplification factor is about 3 or less in the frequency region 10 - 45Hz in X and Y direction • Amplification factor is less than 2 in the frequency region less than 10Hz • Especially it is quite small in V direction in the frequency region less than 40HZ except for a small resonance at 21Hz, where the amplification factor is about 3 4. Integrated amplitude (nm) 1Hz X Y V ; 10Hz X Y V ; 20Hz X Y V Floor 60 60 80 ; 06 08 15 ; 02 2.3 03 QF17X 60 60 80 ; 20 17 15 ; 20 15 04 --- Floor 40 40 40 ; 09 04 12 ; 3.4 1.8 4.5 QM12FF 90 55 40 ; 80 30 15 ; 80 12 09

  18. < --- >

  19. 1b-1 Concrete Block (---) versus Floor (---) PSD (Power Spectrum Density) 10-4 X (N-S) Y (W-E) V 10-8 PSD (mm2/Hz) 10-12 0.1 1 10 100 0.1 1 10 100 0.1 1 10 100 Frequency (Hz)

  20. 1b-2 Concrete Block (---) versus Floor (---) Integrated PSD X (N-S) 10-3 Y (W-E) V (W-E) Integ. PSD (mm) 10-6 0.1 1 10 100 0.1 1 10 100 0.1 1 10 100 Frequency (Hz)

  21. 1b-3 PSD Ratio Concrete Block / Floor Frequency (Hz)

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