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  • GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)
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Sushil Sharma GM2000 November 6, 2000 GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES S. Sharma, C. Doose (APS) and G. Portmann (ALS) L. Zhang (ESRF) K. Tsumaki (SPRING-8) D. J. Wang (SRRC) OUTLINE • Vibrational Stability Requirements • Ground Vibrations at Light Sources • Magnet Vibrations • Girder Design and Viscoelastic Damping • Vibrations and Beam Motion • Summary

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Page 1: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES

S. Sharma, C. Doose (APS)

and

G. Portmann (ALS)

L. Zhang (ESRF)

K. Tsumaki (SPRING-8)

D. J. Wang (SRRC)

OUTLINE

• Vibrational Stability Requirements

• Ground Vibrations at Light Sources

• Magnet Vibrations

• Girder Design and Viscoelastic Damping

• Vibrations and Beam Motion

• Summary

Page 2: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

VIBRATIONAL STABILITY REQUIREMENTS

PRESENT GOAL:

• Beam motion to be within 10% of the beam size (5% at APS).

��∆∆∆∆X (beam) ≈≈≈≈ 10 – 25 µµµµm (rms)

��∆∆∆∆Y (beam) ≈≈≈≈ 1 – 5 µµµµm (rms)

• Beam optics magnification

• Budget for vibrations

��ALS - ∆∆∆∆X (magnet) < 0.1 µµµµm (0.1 Hz to 1 kHz)

��APS - ∆∆∆∆X (magnet) ≤≤≤≤ 0.11 µµµµm (4 – 50 Hz) ��ESRF - Reduce Q (50) by a factor of 5

��SPRING-8 - No specific requirement

��SRRC - No specific requirement

• FUTURE GOAL :

��Sub-micron beam stability

Page 3: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

10-10

10-8

10-6

10-4

10-2

0 10 20 30 40 50

APS_Sector12 (25 nm)ALS_Sector4 (16 nm)ESRF_C22/G30 (30 nm)SPRING-8_C28 (25 nm)SRRC_R6Q2 (73 nm)

Frequency (Hz)

Dis

pla

cem

ent

PS

D (

µµ µµ m2 /H

z)

PSD - Horizontal Ground Motion

Page 4: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

10-10

10-8

10-6

10-4

10-2

0 10 20 30 40 50

ALS (20 nm)ESRF (96 nm)SPRING-8 (25 nm)

Frequency (Hz)

Dis

pla

cem

ent

PS

D (

µµ µµ m2 /H

z)

PSD - Vertical Ground Motion

Page 5: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

10-10

10-8

10-6

10-4

10-2

0 20 40 60 80 100

ALS_Sector4ESRF_C22/G30SPRING-8_C28

close to Cell 28 Machine room

Frequency (Hz)

Dis

pla

cem

ent

PS

D (

µµ µµ m2 /H

z)PSD - Vertical Ground Motion

Page 6: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

10-10

10-8

10-6

10-4

10-2

100

0 10 20 30 40 50

Quad_41f (201 nm)Floor_Sector4 (16 nm)

Source: G. Portmann

Frequency (Hz)

Dis

pla

cem

ent

PS

D (

µµ µµ m2 /H

z)ALS

Horizontal Motion Spectra

Page 7: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

10-10

10-8

10-6

10-4

10-2

100

0 10 20 30 40 50

Quad_AQ4_Sector12_d (51 nm)Floor_Sector12_d (25 nm))Quad_AQ4_Sector2_nd (291 nm) Floor_Sector2_nd (37 nm)

Note: Sector 2 near shutdown actvities (Oct.,00)

d: damped; nd: undamped

Frequency (Hz)

Dis

pla

cem

ent

PS

D (

µµ µµ m2 /H

z)APS

Horizontal Motion Spectra - Sectors 2,12

Page 8: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

10-9

10-7

10-5

10-3

0 10 20 30 40 50

Quad_nd (102 nm)Floor_nd (47 nm)Quad_d (40 nm)Floor_d (30 nm)

d: damped; nd: undamped

Source: L. Zhang

Frequency (Hz)

Dis

pla

cem

ent

PS

D (

µµ µµ m2 /H

z)

ESRF Horizontal Motion Spectra - Cell22/G30

Page 9: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

10-9

10-7

10-5

10-3

10-1

0 10 20 30 40 50

Magnet_Q5_C28 (48 nm)Floor_C28 (25 nm)

Source: K. Tsumaki

Frequency (Hz)

Dis

pla

cem

ent,

PS

D (

µµ µµ m2 /H

z)SPRING-8

Horizontal Motion Spectra - Cell 28

Page 10: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

10-11

10-8

10-5

10-2

101

0 10 20 30 40 50

Quad_R5Q2_nd (126 nm)Floor_R5Q2_nd (71 nm)Quad_R6Q2_d (92 nm)Floor_R6Q2_d (73 nm)

d:damped; nd: undamped

Source: D.J. Wang

Frequency (Hz)

Dis

pla

cem

ent

PS

D (

µµ µµ m2 /H

z)

SRRCHorizontal Motion Spectra - R5Q2/R6Q2

Page 11: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification

Floor (nm) Quad (nm) Facility

Undamp. Damp. Undamp. Damp.

Amp. Undamped

Amp. Damped

ALS 16 201 12.6

APS 37 (1) 25 291 (1) 51 7.9 2.0

ESRF 47 (2) 30 102 40 2.2 1.3

SPRING-8 25 (3) 48 (3) 1.9

SRRC 71 (3) 73 126 92 1.8 1.3

Notes:

(1) Location close to shutdown activities.

(2) Vacuum pumping operation during vibration tests.

(3) Location close to mechanical equipment room.

Page 12: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

10-10

10-8

10-6

10-4

10-2

100

0 10 20 30 40 50

Quad_41f (47 nm)Floor_Sector4 (20 nm)

Source: G. Portmann

Frequency (Hz)

Dis

pla

cem

ent

PS

D (

µµ µµ m2 /H

z)

ALSVertical Motion Spectra

Page 13: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

APS Girder Assembly

High Q: • Narrow width

• No mid-point support • Long lever arm for torsional mode

Page 14: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

ESRF Girder Assembly

(Source: L. Zhang)

• Mid-point support

• Damping pads in lateral shear

Page 15: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

Viscoelastic Damping

• Viscoelastic materials (VEMs) absorb vibrational energy by high (up

to 100%) cyclic shear strain. The damping pads are most effective when installed in high shear strain regions.

• Damping pads can reduce ‘Q’ by one order of magnitude.

• Several VEMs tested at the APS showed high creep and radiation

resistance.

• The damping pads are inexpensive, and can be installed as retrofit without breaking vacuum connections.

Page 16: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

Vibrations and Beam Motion

APS Beam Stability Performance to Date (5/98) (Source: Glenn Decker)

Frequency Band

Horizontal Motion

∆X (microns rms) Vertical Motion

∆Y (microns rms) Limitations

Low

Frequency Drift (1.E-06 – 0.017 Hz)

< σ(x) 2.5 to 20

Electronics Intensity Dependence, Mechanical and

Electrical Thermal Effects, RFBPM Bunch Pattern

Dependence, IDXBPM stray radiation

Jitter (.017 – 30 Hz) <4.5, or 1.3% σ(x) <1.8, or 10% σ(y)

High Bandwidth Corrector Availability, IDXBPM stray radiation, [Vibrations]

High Frequency

(30 – 500 Hz) < 12.4 < 7.5

Power Supply, RF Voltage Stability

[Vibrations] Very High Frequency

(0.5 – 135 kHz) 5 6

RF Voltage Stability, Multibunch Instabilities

Broadband Total

14.1 + drift 10.1 to 22.3 Long Term Drift

Beam sizes σ(x) = 335 µm, σ (y)= 18 µm @ 1% coupling

Page 17: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma – GM2000 – November 6, 2000

Page 18: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

10-10

10-7

10-4

10-1

102

0 10 20 30 40 50

BPM91H (2.69 µµµµm)Quad_41f (0. 20 µµµµm)

Source: G. Portmann

Frequency (Hz)

Dis

pla

cem

ent

PS

D (

µµ µµ m2 /H

z)

ALSHorizontal Beam/Quad Motions

Page 19: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

Vibrations and Beam Motion (contd.)

• ALS: 1 to 3 µµµµm due to ground vibration (0.1 to 300 Hz)

• ESRF:

• SPRING-8:

��No effect on horizontal beam size. ��Effect on vertical beam size is being

determined.

• SRRC: No obvious relation.

Page 20: GROUND VIBRATION PROBLEMS AT THE LIGHT SOURCES€¦ · Sushil Sharma GM2000 November 6, 2000 Horizontal Motion Band Power (2-50 Hz) and Band Power Amplification Floor (nm) Quad (nm)

Sushil Sharma GM2000

November 6, 2000

SUMMARY BEAM STABILITY (> 2 Hz) For Present Stability Goal (5-10% beam size):

• Vibration problems have been (or can be) addressed by optimizing girder designs, using damping pads and isolating vibrations from mechanical equipment.


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