11
1 October 21, 2005 Internal LCLS Undulator Alignment and Motion Review Georg Gassner, SLAC / MET [email protected] [email protected] HLS Monitoring System Georg Gassner, SLAC / MET October 21, 2005 HLS Introduction HLS Principle Types of Sensors Integration of HLS with the Undulator

October 21, 2005 Internal LCLS Undulator Alignment and Motion Review Georg Gassner, SLAC / MET [email protected] 1 HLS Monitoring System Georg

  • View
    214

  • Download
    1

Embed Size (px)

Citation preview

Page 1: October 21, 2005 Internal LCLS Undulator Alignment and Motion Review Georg Gassner, SLAC / MET gassner@slac.stanford.edu 1 HLS Monitoring System Georg

1October 21, 2005Internal LCLS Undulator Alignment and Motion Review

Georg Gassner, SLAC / [email protected]@slac.stanford.edu

HLS Monitoring System Georg Gassner, SLAC / MET

October 21, 2005

HLS Monitoring System Georg Gassner, SLAC / MET

October 21, 2005

HLS Introduction HLS Principle Types of Sensors Integration of HLS with the Undulator

HLS Introduction HLS Principle Types of Sensors Integration of HLS with the Undulator

Page 2: October 21, 2005 Internal LCLS Undulator Alignment and Motion Review Georg Gassner, SLAC / MET gassner@slac.stanford.edu 1 HLS Monitoring System Georg

2October 21, 2005Internal LCLS Undulator Alignment and Motion Review

Georg Gassner, SLAC / [email protected]@slac.stanford.edu

Hydrostatic Leveling System Introduction

The free surfaces of bodies of water have been used for several thousand years as a vertical reference.

The proposed Hydrostatic Level Systems (HLS) has several significant advantages over optical methods in determining height differences between two points. Some of these advantages are:

No direct line of sight needs to exist

Not affected by optical refraction

Higher accuracy

Fully automated

Self calibrating

Equipotential surface is the reference

The free surfaces of bodies of water have been used for several thousand years as a vertical reference.

The proposed Hydrostatic Level Systems (HLS) has several significant advantages over optical methods in determining height differences between two points. Some of these advantages are:

No direct line of sight needs to exist

Not affected by optical refraction

Higher accuracy

Fully automated

Self calibrating

Equipotential surface is the reference

Page 3: October 21, 2005 Internal LCLS Undulator Alignment and Motion Review Georg Gassner, SLAC / MET gassner@slac.stanford.edu 1 HLS Monitoring System Georg

3October 21, 2005Internal LCLS Undulator Alignment and Motion Review

Georg Gassner, SLAC / [email protected]@slac.stanford.edu

Motion of Earth Surface

The disadvantage of using the equipotential surface as a reference is that the earth surface itself is not stable but in constant motion.

Earth tides due to sun

and moonAre up to 30m

for a 123 m long

Undulator

Can be modeled

Ocean tide loading

and atmospheric loadingCan reach up to 30 m

Can not be modeled

The disadvantage of using the equipotential surface as a reference is that the earth surface itself is not stable but in constant motion.

Earth tides due to sun

and moonAre up to 30m

for a 123 m long

Undulator

Can be modeled

Ocean tide loading

and atmospheric loadingCan reach up to 30 m

Can not be modeled

Page 4: October 21, 2005 Internal LCLS Undulator Alignment and Motion Review Georg Gassner, SLAC / MET gassner@slac.stanford.edu 1 HLS Monitoring System Georg

4October 21, 2005Internal LCLS Undulator Alignment and Motion Review

Georg Gassner, SLAC / [email protected]@slac.stanford.edu

HLS Principle

Hydrostatic Leveling Systems are based on the principle of communicating vessels or more precisely on the equilibrium of the pressure of the fluid in the communicating vessels. This is mathematically described by the Bernoulli equation.

p + g Z = const.

p = 0.10 hPa => Z = 1.02 mm

Temp = 1°C; Z = 100 mm => Z = 67 m

Hydrostatic Leveling Systems are based on the principle of communicating vessels or more precisely on the equilibrium of the pressure of the fluid in the communicating vessels. This is mathematically described by the Bernoulli equation.

p + g Z = const.

p = 0.10 hPa => Z = 1.02 mm

Temp = 1°C; Z = 100 mm => Z = 67 m

Page 5: October 21, 2005 Internal LCLS Undulator Alignment and Motion Review Georg Gassner, SLAC / MET gassner@slac.stanford.edu 1 HLS Monitoring System Georg

5October 21, 2005Internal LCLS Undulator Alignment and Motion Review

Georg Gassner, SLAC / [email protected]@slac.stanford.edu

HLS Configuration

There are two principle configurations:

Full filled pipe systemFaster damping time <2 min

Easier installation

Half filled pipe systemTemperature differences

do not affect the measurements

Damping time ~10 min

There are two principle configurations:

Full filled pipe systemFaster damping time <2 min

Easier installation

Half filled pipe systemTemperature differences

do not affect the measurements

Damping time ~10 min

Air Circuit

Water Circuit

HLS Sensor

Pipe half-filled with Water

HLS Sensor

Page 6: October 21, 2005 Internal LCLS Undulator Alignment and Motion Review Georg Gassner, SLAC / MET gassner@slac.stanford.edu 1 HLS Monitoring System Georg

6October 21, 2005Internal LCLS Undulator Alignment and Motion Review

Georg Gassner, SLAC / [email protected]@slac.stanford.edu

Types of Sensors - Capacitive Sensor

Principle

Measures the Capacity C of the System

AttributesProven to work for many years

Inexpensive

Precision < 1 m

Accuracy (10 mm range) < 5 m

Possibly affected by drift

Absolute height measurements are only indirectly achievable

Principle

Measures the Capacity C of the System

AttributesProven to work for many years

Inexpensive

Precision < 1 m

Accuracy (10 mm range) < 5 m

Possibly affected by drift

Absolute height measurements are only indirectly achievable

WaterAir CCC

111

D

AC

Ceramic

plate

ElectronicSensing Electrode

Air

Water DWater

DAir

Page 7: October 21, 2005 Internal LCLS Undulator Alignment and Motion Review Georg Gassner, SLAC / MET gassner@slac.stanford.edu 1 HLS Monitoring System Georg

7October 21, 2005Internal LCLS Undulator Alignment and Motion Review

Georg Gassner, SLAC / [email protected]@slac.stanford.edu

Types of Sensors - Ultrasound Sensor

Principle

Measures the runtime of an

ultrasound pulse

AttributesNo drift (self calibrating)

Precision < 0.1 m

Accuracy (10 mm range) < 3 m

Absolute Measurements

More expensive

No long-term experience (10 years)

Principle

Measures the runtime of an

ultrasound pulse

AttributesNo drift (self calibrating)

Precision < 0.1 m

Accuracy (10 mm range) < 3 m

Absolute Measurements

More expensive

No long-term experience (10 years)UltrasoundProbe

Fiducial

Reference surfaces

Page 8: October 21, 2005 Internal LCLS Undulator Alignment and Motion Review Georg Gassner, SLAC / MET gassner@slac.stanford.edu 1 HLS Monitoring System Georg

8October 21, 2005Internal LCLS Undulator Alignment and Motion Review

Georg Gassner, SLAC / [email protected]@slac.stanford.edu

HLS measurements related to the Girder

Any three HLS sensors provide independent monitoring ofHeight of the girder

Roll of the girder

Pitch of the girder

The fourth sensor provides a controlled measurement

Any three HLS sensors provide independent monitoring ofHeight of the girder

Roll of the girder

Pitch of the girder

The fourth sensor provides a controlled measurement

HLS 1 HLS 2

HLS 4 HLS 3Beam

pitch

rollheight

Page 9: October 21, 2005 Internal LCLS Undulator Alignment and Motion Review Georg Gassner, SLAC / MET gassner@slac.stanford.edu 1 HLS Monitoring System Georg

9October 21, 2005Internal LCLS Undulator Alignment and Motion Review

Georg Gassner, SLAC / [email protected]@slac.stanford.edu

Integration of HLS with the Undulator

Three capacitive sensors per girderreliable determination of height, roll and pitch

One ultrasonic sensor per girderAbsolute measurements

Calibration of the system

Controlled measurements

2 inch stainless steel pipes to connect the pots for optimal

damping and maintenance

All sensors are connected with TCP/IP (IEEE 802.3af)Following a standard (off the shelf products)

Power supply included

Each sensor communicates independently from all others

Three capacitive sensors per girderreliable determination of height, roll and pitch

One ultrasonic sensor per girderAbsolute measurements

Calibration of the system

Controlled measurements

2 inch stainless steel pipes to connect the pots for optimal

damping and maintenance

All sensors are connected with TCP/IP (IEEE 802.3af)Following a standard (off the shelf products)

Power supply included

Each sensor communicates independently from all others

Page 10: October 21, 2005 Internal LCLS Undulator Alignment and Motion Review Georg Gassner, SLAC / MET gassner@slac.stanford.edu 1 HLS Monitoring System Georg

10October 21, 2005Internal LCLS Undulator Alignment and Motion Review

Georg Gassner, SLAC / [email protected]@slac.stanford.edu

Conclusion

Reliable and controlled method for monitoring heights of the girders (1 m level small range)

pitches of the girders (0.5 rad)

rolls of the girders (2 rad)

Damping within 10 min

Supplies Wire Positioning System with information to determine the sag

Reliable and controlled method for monitoring heights of the girders (1 m level small range)

pitches of the girders (0.5 rad)

rolls of the girders (2 rad)

Damping within 10 min

Supplies Wire Positioning System with information to determine the sag

Page 11: October 21, 2005 Internal LCLS Undulator Alignment and Motion Review Georg Gassner, SLAC / MET gassner@slac.stanford.edu 1 HLS Monitoring System Georg

11October 21, 2005Internal LCLS Undulator Alignment and Motion Review

Georg Gassner, SLAC / [email protected]@slac.stanford.edu

End of Presentation