Slide 1MARIC – 28th April 2004
First experimental results on stability of cryodipoles with central support post blocked
Introduction
Conclusion
Introduction
Reminder: Conclusion of the workshop of the 16th of March 2004 on LHC dipole geometry and stability [1]
Central foot blockage is implemented unless showstopper
Validation on 10 magnets via additional measurements
Geometry measurement during cold tests
First experimental results on cryodipoles with central foot blocked will be presented
At warm
Initial proposed plan and validation status
CM transport
Evaluation of stability for MD
Central foot blocked
Central foot not blocked
And comparison on the basis of several definite geometry criteria, at each step in the production process
Blocking
STATUS
17 cryodip. for validation
10 Cryodipole done, incl
2 transported and re-fidu.
Note: approx 30 unplanned Fidus done by team of Dominique M.
ITP20 industry meas.
Stability study using sagitta
*1 choice and definition of parameters agreed within team
*2 Work presented is a courtesy of Elena W. et al. [2]
Blocked, 5 magnets
Number of magnets
(dS) : Difference in sagitta between entry into cold tests (WP03)
and after cold tests (WP08) (absolute value) [mm]
Not Blocked, 30 magnets
Stability study using sagitta
-1
0
1
2
1
2
3
4
Number of magnets
(dS) : Difference in sagitta between fidu after cold tests (WP08) and arrival in SMi2 (WP08b) (absolute value) [mm]
the Large Hadron Collider project
Stability study using max difference
Maximum difference between CM shapes (10th order poly fit, support posts superposed) *1 *2
Not blocked, 31 magnets
will improved with time
between 2 steps
Stability study of CM extremity wrt cryostat
-
CM ext. displ.
between 2 steps
Stability study conclusions
Stability seems improved with central support blocked
Validation is not complete yet, more magnets will enable more precise statistics
& Validation team is preparing a joint project note on subject
the Large Hadron Collider project
Cool down measurement set-up in SM18
Cryostat fiducials relative displacements (Leica measurement only)
Leica and magnetic measurement, with a MOLE [3]
Leica 1
Leica 2
Top view
Cryostat fiducial M (middle) horizontal relative displacement during cool down
Chart1
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Contributors: V Bhatnagar, M Buzio, G Deferne, P Kuppusamy, JG Perez
start cool-down 300K
100K
80K
10K
270K
Fixed external ref. leads to meas. max error of 0,08 mm
Middle Cryostat Fiducial
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Contributors: V Bhatnagar, M Buzio, G Deferne, P Kuppusamy, JG Perez
start cool-down 300K
100K
80K
10K
270K
Fixed external ref. leads to meas. max error of 0,08 mm
Middle Cryostat Fiducial
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Contributors: V Bhatnagar, M Buzio, G Deferne, P Kuppusamy, JG Perez
start cool-down 300K
100K
80K
10K
270K
Fixed external ref. leads to meas. max error of 0,08 mm
Middle Cryostat Fiducial
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Contributors: V Bhatnagar, M Buzio, G Deferne, P Kuppusamy, JG Perez
start cool-down 300K
100K
80K
10K
270K
Fixed external ref. leads to meas. max error of 0,08 mm
Middle Cryostat Fiducial
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Contributors: V Bhatnagar, M Buzio, G Deferne, P Kuppusamy, JG Perez
start cool-down 300K
x-th
t
a
b
Middle Cryostat Fiducial
Center of CM in the middle of magnet (estimated from magnetic axis in V1 + thermal contraction a)
Center of CM in the middle of magnet (estimated from magnetic axis in V1 + thermal contraction b
Displacement [mm] - (Positive = towards LHC center)
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Contributors: V Bhatnagar, M Buzio, G Deferne, P Kuppusamy, JG Perez
start cool-down 300K
Middle Cryostat Fiducial
Center of CM in the middle of magnet (estimated from magnetic axis in V1 + thermal contraction b)
Displacement [mm] - (Positive = towards LHC center)
LEICA tracking of dipole 2032 with central foot blocked during cool-down in SM18 Horizontal component (displacement relative to initial position)
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Contributors: V Bhatnagar, M Buzio, G Deferne, O Dunkel, P Kuppusamy, JG Perez
start cool-down 300K
Displacement [mm] - (Positive = towards LHC center)
LEICA tracking of dipole 2032 with central foot blocked during cool-down in SM18 Vertical component (displacement relative to initial position)
0
0
-0.015
0
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0.03
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0.14
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0.225
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0.173
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0.185
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0.166
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0.2
0
0.183
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0.229
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0.201
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0.2
0
0.172
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0
T
Time
total contraction dx (linear)
total contraction dy (linear)
total contraction dx (exponential)
Chart2
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38099.3909259259
Contributors: V Bhatnagar, M Buzio, G Deferne, P Kuppusamy, JG Perez
start cool-down 300K
Thermal contraction correction using Exponential profile A Linear profile B
x-th
t
a
b
Middle Cryostat Fiducial
Center of CM in the middle of magnet (estimated from magnetic axis in V1 + thermal contraction a)
Center of CM in the middle of magnet (estimated from magnetic axis in V1 + thermal contraction b
Absolute Displacement [mm] - (Positive = towards LHC center)
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Contributors: V Bhatnagar, M Buzio, G Deferne, P Kuppusamy, JG Perez
start cool-down 300K
Thermal contraction correction using Exponential profile A Linear profile B
x-th
t
a
b
Middle Cryostat Fiducial
Center of CM in the middle of magnet (estimated from magnetic axis in V1 + thermal contraction a)
Center of CM in the middle of magnet (estimated from magnetic axis in V1 + thermal contraction b
Absolute Displacement [mm] - (Positive = towards LHC center)
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Contributors: V Bhatnagar, M Buzio, G Deferne, P Kuppusamy, JG Perez
start cool-down 300K
100K
80K
10K
270K
Fixed external ref. leads to meas. max error of 0,08 mm
Middle Cryostat Fiducial
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38099.0997685185
38099.1105092593
38099.1212731482
38099.132025463
38099.1427777778
38099.1470601852
38099.1578125
38099.1685763889
38099.1793402778
38099.1901041667
38099.2008680556
38099.2159490741
38099.2267013889
38099.2374421296
38099.2481828704
38099.2589467593
38099.2697106482
38099.2847916667
38099.2955324074
38099.3062847222
38099.3170486111
38099.3277893519
38099.3385416667
Contributors: V Bhatnagar, M Buzio, G Deferne, P Kuppusamy, JG Perez
start cool-down 300K
100K
80K
10K
270K
Fixed external ref. leads to meas. max error of 0,08 mm
Middle Cryostat Fiducial
0
0.0360946597
0.0128694051
0.0457553114
0.6218267443
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Time
Time
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38098.5329282407
38098.5329282407
38098.5350347222
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38099.3767476852
38099.3767476852
38099.3838657407
38099.3838657407
38099.3909259259
38099.3909259259
Contributors: V Bhatnagar, M Buzio, G Deferne, P Kuppusamy, JG Perez
start cool-down 300K
Thermal contraction correction using Exponential profile A Linear profile B
x-th
t
a
b
Middle Cryostat Fiducial
Center of CM in the middle of magnet (estimated from magnetic axis in V1 + thermal contraction a)
Center of CM in the middle of magnet (estimated from magnetic axis in V1 + thermal contraction b
Absolute Displacement [mm] - (Positive = towards LHC center)
0
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