Alignment of Magnet Apertures & Alignment of Magnet Apertures & Surveying with Leica Leica Laser Tracker Laser Tracker Surveying with Module Module B.Sasidhar Rao B.Sasidhar 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 � on a magnet , eases insertion of shaft on 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- -reflector via a reflector via a motorised motorised mirror mirror moving retro � 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’ ’s position s position tracks and displays reflector continuosly until the beam is broken until the beam is broken continuosly � 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 principle(2D) principle(2D) Gare Cornavin Trilateration St.Genis Checkpost
Alignment of Magnet with Leica Leica Alignment of Magnet with Laser Tracker Laser Tracker
Features of of Laser Laser Tracker Tracker Features • 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 for for magnet magnet alignment alignment Requirement 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 measure measure position position of of alignment alignment references references To 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 Set up Set up Leica � 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 levelled levelled instrument instrument from an exactly
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 Mole Reflector
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 ordinate 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 of the measurement till alignment is � within acceptable tolerance ( < 2mm) within acceptable tolerance ( < 2mm)
Alignment Scans for SSS604 Aperture1 Series1 16 z z 14 z z MRB z 12 Scan1 CF Scan2 10 Scan3 Scan6 8 Scan4 6 Scan5 4 2 -16000 -14000 -12000 -10000 -8000 -6000 -4000 -2000 0
Surveying of Magnet axis with Surveying of Magnet axis with Leica Laser Tracker Laser Tracker Leica
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 fiducials fiducials the magnetic axis to the magnet � 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 of 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- -D points in D points in Building a network of 3 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
Stations Location Tracker location for station 2 Tracker location for station 1 RP2 RP4 RP1 RP3 MLI MC CFB SSS SSW MLE Stage A SSW Stage B RP
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