Alignment of Magnet Apertures & Alignment of Magnet Apertures - - PowerPoint PPT Presentation

Alignment of Magnet Apertures & Alignment of Magnet Apertures & Surveying with Surveying with Leica Leica Laser Tracker Laser Tracker Module Module

• B.Sasidhar

B.Sasidhar Rao Rao

• Shradha Palod

Shradha Palod

• Raghavendra Gangoor

Raghavendra Gangoor

Warm Measurements with Laser Warm Measurements with Laser Tracker Module Tracker Module

• Alignment of magnet with bench at CFB and

Alignment of magnet with bench at CFB and MRB sides. MRB sides.

• Required when magnetic measurements are done

Required when magnetic measurements are done

• n a magnet , eases insertion of shaft
• n a magnet , eases insertion of shaft
• Especially with SSSS, when the bench is not

Especially with SSSS, when the bench is not exactly confirming to the magnet geometry exactly confirming to the magnet geometry

• Surveying

Surveying

• Required with SSW measurement to find the

Required with SSW measurement to find the position of stretch wire position of stretch wire

LASER Tracker Module LASER Tracker Module

• The laser tracker is a transportable 3D measuring system,

measuring vertical and horizontal angles as well as interferometric or absolute distances.

• The laser tracker used is the LEICA LTD 500.
• Consisting of the central Tracking unit, LT Controller unit,

Reflectors, application s/w, Level meter, Laptop, hardware lock etc.

Introduction to measurement with Introduction to measurement with Laser Tracker Laser Tracker

• This is Laser Interferometer which tracks a

This is Laser Interferometer which tracks a moving retro moving retro-

• reflector via a

reflector via a motorised motorised mirror mirror

• Permits real time distance measurements

Permits real time distance measurements

• Once the laser beam locks onto the reflector it

Once the laser beam locks onto the reflector it tracks and displays reflector tracks and displays reflector’ ’s position s position continuosly continuosly until the beam is broken until the beam is broken

• Reflectors used for different applications

Reflectors used for different applications

• Corner Cube Reflector (CCR)

Corner Cube Reflector (CCR)

• Tooling Ball Reflector (TBR)

Tooling Ball Reflector (TBR)

Trilateration Trilateration principle(2D) principle(2D)

St.Genis Gare Cornavin Checkpost

Alignment of Magnet with Alignment of Magnet with Leica Leica Laser Tracker Laser Tracker

Features Features of

• f Laser

Laser Tracker Tracker

• Fully automatic tracking system as a huge

Fully automatic tracking system as a huge amount of magnets has to be measured amount of magnets has to be measured

• Automatic measurement inside a tube of 50 mm

Automatic measurement inside a tube of 50 mm and 15 m length and 15 m length

• An accuracy better than 0.1 mm and reliability

An accuracy better than 0.1 mm and reliability using redundancy using redundancy

• Transportability as the works take place in

Transportability as the works take place in different places different places

Requirement Requirement for for magnet magnet alignment alignment

Dipoles Dipoles

• Compliance to geometric tolerance limits

Compliance to geometric tolerance limits

• To

To check check bended bended shape shape ( (tolerance tolerance is is +/ +/-

• 1mm) for

1mm) for mechanical mechanical aperture aperture

To To measure measure position position of

• f alignment

alignment references references

• Quadrupole

Quadrupole

• To facilitate smooth insertion of shaft for magnetic measurement

To facilitate smooth insertion of shaft for magnetic measurements s

• Requirements

Requirements

• Compliance to geometric tolerance limits

Compliance to geometric tolerance limits

• High Precision

High Precision

• Measurement Portability

Measurement Portability

• Solution:

Solution: Laser Tracker along with suitable Mole Laser Tracker along with suitable Mole

Alignment Procedure Alignment Procedure

• Leica

Leica Set up Set up

• Orient to Gravity

Orient to Gravity

• Measurement

Measurement

• Analysis of result

Analysis of result

Leica Leica Set up Set up

• Warm up of Laser

Warm up of Laser – – takes about 15 min takes about 15 min

• Start temperature and pressure monitoring

Start temperature and pressure monitoring

• Fixing position of

Fixing position of Leica Leica so that tracking is possible so that tracking is possible till the end of the magnet without losing the beam till the end of the magnet without losing the beam

• 2 to 3 iterations are required for exact positioning.

2 to 3 iterations are required for exact positioning.

• Levelling

Levelling

Orient to Gravity Orient to Gravity

• Orient to gravity is done using NIVEL level

Orient to gravity is done using NIVEL level sensor sensor

• It is used to set

It is used to set leica leica’ ’s s primary( standing) axis primary( standing) axis very close to gravity (vertical) very close to gravity (vertical)

• Any residual tilt is compensated by correcting the

Any residual tilt is compensated by correcting the measured angles such that they appear to come measured angles such that they appear to come from an exactly from an exactly levelled levelled instrument instrument

Measurement Measurement

• Creation of Station for each measurement

Creation of Station for each measurement

• Select the type of reflector being used

Select the type of reflector being used

• Install mole in the magnet aperture and attach

Install mole in the magnet aperture and attach reflector on the mole reflector on the mole

Reflector Mole

Analysis of Result Analysis of Result

• After the

After the leica leica scans for the full magnet length, the scans for the full magnet length, the results are available for analysis results are available for analysis

• Translation of co

Translation of co-

• ordinate axis is done such that
• rdinate axis is done such that

(0,0,0) point is transformed onto the CFB of the (0,0,0) point is transformed onto the CFB of the magnet aperture for which alignment is carried out magnet aperture for which alignment is carried out

• Plotting the results in the excel sheet for analysis

Plotting the results in the excel sheet for analysis

• Repeatation

Repeatation of the measurement till alignment is

• f the measurement till alignment is

within acceptable tolerance ( < 2mm) within acceptable tolerance ( < 2mm)

2 4 6 8 10 12 14 16

• 16000 -14000 -12000 -10000
• 8000
• 6000
• 4000
• 2000

Series1 z z z z z

MRB CF

Scan1 Scan2 Scan3

Alignment Scans for SSS604 Aperture1

Scan4 Scan5 Scan6

Surveying of Magnet axis with Surveying of Magnet axis with Leica Leica Laser Tracker Laser Tracker

Aim Aim

• A laser tracker system is used to survey the

A laser tracker system is used to survey the SSW system and the magnet in order to link SSW system and the magnet in order to link the magnetic axis to the magnet the magnetic axis to the magnet fiducials fiducials

• By this one can get exact location of stretch

By this one can get exact location of stretch wire inside the magnet, which is used to wire inside the magnet, which is used to compute the magnetic axis compute the magnetic axis

• Global Survey Accuracy : 50

Global Survey Accuracy : 50-

• 100 microns

100 microns

Surveying Procedure Surveying Procedure

• Build a network of points in 3

Build a network of points in 3-

• D space

D space

• As it is impossible to

As it is impossible to “ “ see see” ” all all fiducials fiducials of both SSW

• f both SSW

stages and magnet from one single location, the entire stages and magnet from one single location, the entire survey is performed from two different positions survey is performed from two different positions

• Installation of

Installation of Leica Leica and survey at CFB side and survey at CFB side

• Installation of

Installation of Leica Leica and survey at MRB side and survey at MRB side

• Analysis of measured data

Analysis of measured data

Building a network of 3 Building a network of 3-

• D points in

D points in Space Space

• Points used for networking should be carefully

Points used for networking should be carefully identified identified

• The points should be such that at least 3 common

The points should be such that at least 3 common points are visible from both the stations. A large points are visible from both the stations. A large number of points should be measured for better number of points should be measured for better accuracy accuracy

• The points should be stable, fix and should not be

The points should be stable, fix and should not be disturbed till the entire measurement is completed disturbed till the entire measurement is completed

Stage A Survey Points Stage B Survey Points

Tracker location for station 1

Stations Location

SSS

Tracker location for station 2

SSW Stage B SSW Stage A

CFB

MLE MLI MC RP1 RP2 RP3 RP4 RP

Definition of measurement points Definition of measurement points

Point name Description B_Y_1 Stage B, top fiducial used for Y position, magnet aperture 1 B_X_1 * Stage B, side fiducial used for X position, magnet aperture 1 A_Y_1 Stage A, bottom fiducial used for Y position, magnet aperture 1 A_X_1 * Stage A, side fiducial used for Y position, magnet aperture 1 B_Y_2 Stage B, top fiducial used for Y position, magnet aperture 2 B_X_2 * Stage B, side fiducial used for X position, magnet aperture 2 A_Y_2 Stage A, bottom fiducial used for Y position, magnet aperture 2 A_X_2 * Stage A, side fiducial used for Y position, magnet aperture 2 MC Reference point. Magnet fiducial, connection (MRB) side. MLI Reference point. Magnet fiducial, lyre (CFB) side, internal. MLE Reference point. Magnet fiducial, lyre (CFB) side, external. RP1 Reference point 1, C2 yellow structure, CFB side RP2 Reference point 2, C1 yellow structure, CFB side RP3 Reference point 3, C1 yellow structure, MRB side RP4 Reference point 4, C2 yellow structure, MRB side RP Reference point 5, C2 pillar

Surveying of fiducial points Surveying of network points

Station at CFB Side Station at MRB Side

Installation of Installation of Leica Leica and Survey at and Survey at CFB side CFB side

• Set up of

Set up of Leica Leica -

• as already explained

as already explained

• Orient to Gravity

Orient to Gravity

• Static measurements of network points, magnet

Static measurements of network points, magnet fiducials fiducials and SSW stage and SSW stage-

• B X & Y positions

B X & Y positions

• In Static measurements, the distance between home

In Static measurements, the distance between home position (bird bath) of tracker and the respective point is position (bird bath) of tracker and the respective point is measured measured

• Depending on the location of measuring point , appropriate

Depending on the location of measuring point , appropriate reflector holder should be chosen reflector holder should be chosen

Installation of Installation of Leica Leica and Survey at and Survey at MRB side MRB side

• Set up of

Set up of Leica Leica

• Has to be repeated since the position of

Has to be repeated since the position of Leica Leica is is changed changed

• Orient to Gravity not required

Orient to Gravity not required

• Static measurements of network points,

Static measurements of network points, magnet magnet fiducials fiducials and SSW stage and SSW stage-

• A X & Y

A X & Y positions positions

Analysis of measured data Analysis of measured data

• Orient to network

Orient to network

• As soon as all points have been measured on

As soon as all points have been measured on the two stations, a network orientation is the two stations, a network orientation is required, to set all points in one referential required, to set all points in one referential

• Solving the network to achieve Axis

Solving the network to achieve Axis Alignment Alignment

• For the magnet

For the magnet’ ’s s fiducials fiducials to become the to become the coordinate system of the measurement coordinate system of the measurement

Thank You Thank You