workshop chamonix xiv, elena wildner at/mas1 e. wildner geometry of the main bends and the short...

Workshop Chamonix XIV, Elena Wildner AT/MAS 1

E. Wildner

Geometry of the Main Bends and the Short Straight

Sections


Outline

1. Recall from workshop 20042. Work on the shape3. Results (MB)

1. Shape2. Correctors and spool pieces3. Interconnections

4. Shifts5. The SSS6. Warm-cold relations7. Stability


Outline





Tolerances, centre of cold bore tube

WP08 (af ter coldtest)

near MQ, aperture

Mid cell positions,aperture

Extremities

Critical Positions,aperture

0.8

3.1

0.750.87 0.5

H

V

1.3

0.85

0.60

Extremities

Body

Last WP08 measurement Last industry measurement

15 % can be out horizontally, hard tolerance in industry 1.5

No change w.r.t. Chamonix XIII

H axis points to the centre of the machine


Classification

0 Length

R_rt (y) 0.80.75

R_rt(y)

Silver

SLSR

SLR

MC

MQ

MQMBMBMB

L MC R

0.75 mm

3.1 mm

2.75 mm

h=165v= 35

h=110v=60

h=100v=65

2 4 6 8 10 12 14y

0.25

0.5

0.75

1

1.25

1.5

RaceAp2 2052 silver itp20

Courtesy Bernard Jeanneret approach suggested by Stephane Fartoukh


Important items from Chamonix XIII

1. Shape instability2. Spool piece positioning 3. Data Bases and tools


Shape instability

Example magnet 3041

Workshop in March, outcome:

the central support blocked horizontally

adjustment to last measurement in industry

Plot from web: Geo-data-viewer (courtesy Gregory Bevillard)

Only measurements with blocked support discussed in the presentation


Spool piece positioning The MCS and the MCDO spool piece mechanical axis cannot be measured

after the welding of the end cover. Measurements of the magnetic axis are not made systematically The mechanical axis position can be estimated by assuming rigidity of the

end part of the magnet (hypothesis checked in many different ways). Measurements of the magnetic axis has been made on a set of magnet

from an earlier production. Poor correlation between measurements of magnetic axis and its derived

value from mechanical measurements


Mechanic versus magnetic measurement A campaign was started to verify the measurements of the

magnetic axis and the assembly procedure/measurements in industry

Measurements: The sextupole was measured on a setup similar to industry, at CERN. The mechanic and the magnetic axis of two magnets using Leica and

two different moles were compared. The result of this work is that the magnetic and the mechanic axis

correspond well within 0.15 mm on measurement bench. 5 magnets to be tested at CERN to validate this result (TS/SU and

AT/MTM)Sextupole's Center

X,Z (mm) for Ysext=0

(Magn- mech)

-0.2

-0.15

-0.1

-0.05

0

0.05

0.1

0.15

0.2

-0.2 -0.1 0 0.1 0.2

Hor. axis (X, mm)

Ve

rt. a

xis

(Z

, mm

)

Mole4 (0mrad) Mole 6 (0mrad)Mole4 (3mrad) Mole 6 (3mrad)Mole 4 (8mrad) Mole 4 (13mrad)Mole 6 (13mrad) r=0.15mmr=0.1mm Sextupole acceptation (AT/MEL)

Sextupole's CenterX,Z (mm)

for Ysext=0(Magn- mech)

-0.2

-0.15

-0.1

-0.05

0

0.05

0.1

0.15

0.2

-0.2 -0.1 0 0.1 0.2

Hor. axis (X, mm)

Ver

t. a

xis

(Z, m

m)

Mole4 (0mrad) Mole 6 (0mrad)Mole4 (3mrad) Mole 6 (3mrad)Mole 4 (13mrad) Mole 6 (13mrad)r=0.15mm r=0.1mmSextupole acceptation (AT/MEL)

Courtesy Rocio Chamizo


Data base consolidation, software tools

AT-MAS Geometry Data Base filled immediately after the measurements are available for MB and MQ with all geometrical data and derived entities for analysis.

Data-viewer for all dipole and quadrupole geometric measurements in industry and at CERN available on on the web.

All geometric analysis data for each dipole magnet available as .pdf documents on the web (quadrupoles in progress)

All information for installation available in the AT-MAS geometrical database (shifts etc.)


Outline



4. Shifts5. Warm-cold relations6. Stability


Work on the dipole shape: the model Model needed for extracting different features of the shape for

example: Positioning problems Local deformations

Model: straight mechanical beam supported in three places (no moment)

EI=180 MPa m4

Goal (final measurement)

Initial measurement

With the model we can simulate changes in positioning

In this case no local deformation on this magnet can be seen after simulation of horizontal positioning.


Vertical positioning or local deformations ?

There is a significant local deformation 0.5 m from the end of the dipole. Essentially Ansaldo magnets.


Local vertical deformations, statistics

Vertical flange positions, Alstom (red), Ansaldo (blue), Noell (green). The square represents the mean values and the line the standard deviation.

Statistics from October:


Local vertical deformations, analysis

The difference of the positions of the ends between measurements in industry and measurements at CERN.

Moving average of 15 magnets plotted every 5th magnet. Red curves represent the mean values and the blue the standard deviation.

Positioning differences are modelled to be zero.

The shift in flange position of Ansaldo is now close to zero.

Alstom Ansaldo

Mean -0.14Stdev 0.15

Courtesy Marco La China

Mean 0.11Stdev 0.28

Mean 0.00Stdev 0.20

Noell

Alstom Ansaldo Noell


Local horizontal deformations, statistics

Sagitta adjustment at blocking

Alstom Ansaldo Noell

AlstomAnsaldoNoell



Mean 0.04Stdev 0.27

Statistics from October:


Local horizontal deformations, analysis

Courtesy Marco La China

The non nominal sagitta can be detected on the two lobes after the simulated repositioning (goal last industry measurement)

If a circular initial shape is assumed the model may explain this. Example for 1mm sagitta change of a circular deviation from nominal:

Bias for the ends will be adjusted at the blocking procedure (central support)


Outline

1. Recall from workshop 20042. Work on the shape3. Results from statistics (MB)




Sagitta deviation from nominal

Median 0.00Quantile (85%) [-1.55,1.59] 48 magnets out

Median 0.22Quantile (85%) [-1.59,1.71] 18 magnets out

Median -0.15Quantile (85%) [-1.66,1.38]

Median 0.50Quantile (85%) [-1.17,2.5]

Before Mars 2004 (blocking of central support):

Jan 2005:

Mean 0.02Stdev 1.07

Mean 0.18Stdev 1.11


Mean 0.56Stdev 1.15


Stability of the shape:Difference in sagitta manufacturing-CERN

Jan 2005:

Goal: to reproduce the shape at the last measurement in industry

Before blocking:


Mean 0.66Stdev 0.70


Outline





-0.6 -0.4 -0.2 0.2 0.4 0.6

-0.6

-0.4

-0.2

0.2

0.4

0.6

Sextupoles Ap2

Spool pieces MCS

-0.6 -0.4 -0.2 0.2 0.4 0.6

-0.6

-0.4

-0.2

0.2

0.4

0.6

Sextupoles Ap1

Aperture 2Aperture 1

dx dzMean (0.15, -0.02)Stdev (0.17, 0.21)

dx dzMean (0.14, 0.00)Stdev (0.20, 0.21)

dx dx

dz dz

Tolerance Mean: 0.3 Stdev 0.5


-0.6 -0.4 -0.2 0.2 0.4 0.6

-0.6

-0.4

-0.2

0.2

0.4

0.6

octupoles Ap2

-0.6 -0.4 -0.2 0.2 0.4 0.6

-0.6

-0.4

-0.2

0.2

0.4

0.6

octupoles Ap1

Spool pieces MCDO

Aperture 2Aperture 1

dx dzMean (0.14, -0.03)Stdev (0.17,0.15)

dx dzMean (0.14, -0.03)Stdev (0.17, 0.15)

dx dx

dz dz

Tolerance Mean: 0.3 Stdev 0.5


Outline





-0.75 -0.5 -0.25 0.25 0.5 0.75 1

-0.75

-0.5

-0.25

0.25

0.5

0.75

Flanges lyra ap1

-0.75 -0.5 -0.25 0.25 0.5 0.75 1

-0.75

-0.5

-0.25

0.25

0.5

0.75

Flanges conn ap1

-0.5 0.5 1

-0.75

-0.5

-0.25

0.25

0.5

0.75

Flanges lyra ap2

Flanges, last measurement at CERN

-0.75 -0.5 -0.25 0.25 0.5 0.75 1

-0.75

-0.5

-0.25

0.25

0.5

0.75

Flanges conn ap2Aperture 1 Aperture 2

Connection

Lyra

dx dzMean (0.14, 0.10)Stdev (0.21, 0.23)

dx dzMean (0.19, -0.05)Stdev (0.17, 0.15)

dx dzMean (0.11, 0.12)Stdev (0.22, 0.20)

dx dzMean (0.14, -0.03)Stdev (0.19, 0.17)

dx dx

dx dx

dz dz


Outline

1. Recall from workshop 20042. Work on the shape using

modeling3. Results (MB)




Shifts for installation

Magnets are blocked at the central support in a way to reproduce the shape measured at the manufacturer (horizontal).

If the magnet is out of tolerance for any of the service lines or the cold bore, the magnet may need a shift.

This shift should be tolerable for feed down effects and aperture

magnet

Reference meaurement

dx dz

2012 WP08C 0 -0.2

2017 WP08C 0 -0.2

2018 WP08E 0 -0.1

3002 WP08E 0.45 -0.4

3009 WP08C 0 -0.2

3050 WP08C 0.2 0

1053 WP08D -0.4 0

Total 68 magnets: 7 shifted,

All checked at WP08 (last complete measurement)

Courtesy Bernard Jeanneret


Outline

1. Recall from workshop 20042. Work on the shape using

modeling3. Results (MB)




Geometry measurements available for loading in data base last week measurements from AC mole (magnetic and mechanic) Measurements from stretched wire (warm and cold)

Analysis of geometry-data and geometry just started, tolerances for beam still to be defined.

Difference in magnetic axis measurements (MQ) with AC mole SSW offset and spread.

The SSS

acmole warm - ssw warm horizontal

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0 5 10 15 20 25 30 35 40

magnet aperture

dx

acmole warm-ssw warm vertical

-0.5

0

0.5

1

1.5

2

0 5 10 15 20 25 30 35 40

magnet aperture

dz

Mean: -0.12Stdev: 0.27

Mean: 0.20Stdev: 0.51


MQ axis, mean values

Warm magnetic axis horizontal, SSW

-0.9-0.8-0.7-0.6-0.5-0.4-0.3-0.2-0.1

00.10.2

0 5 10 15 20 25 30 35 40

magnet

dx

Warm magnetic axis vertical, SSW

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

1.2

1.4

0 5 10 15 20 25 30 35 40

magnet

dz

Reference: mechanical measurement


The SSS on the web

Courtesy Gregory Bevillard, Jerome Beauquis


Outline





Cold warm relations

Cold-warm ssw dx Cold-warm ssw dz

Mean -0.09 -1.51 (-1.34)

Stdev

0.22 0.43 (0.12)

MB cold warm relations still need to be measured

Results for MQ (14 magnets)

Vertical warm-cold (SSW)

-3

-2.5

-2

-1.5

-1

-0.5

0

0 5 10 15 20 25 30 35 40

magnet

dz

Horizontal warm-cold (ssw) mean of both apertures

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0 5 10 15 20 25 30 35 40

magnet

dx


Outline





Last check before installation at WP09

Geometry is checked for installation using the last complete measurement (WP08)

At WP09 there is a reduced measurement where only reference points at the cold mass ends are available (beam screen insertion checks).

However this is a last check before installation

Movements are detectable, this should be considered.

We have not seen clear evidence for any time dependence so far


Center EC transversal mvt WP09-WP08

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

1.2

1

Del

taX

[mm

]

connection

lyre

Stability WP08-WP09

Average 0.1 mm

Center EC vertical Mvt WP09-WP08

-2

-1.5

-1

-0.5

0

0.5

Del

ta Z

[m

m]

connection

lyre

roll

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0 10 20 30 40 50 60 70 80 90 100

magnet

roll

[m

rad

]

twist

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0 20 40 60 80 100

magnet

twis

t [m

rad

]

Average 0.04 mm Average 0.04 mm

Average 0.03 mm (without outliers)

Measurement accuracy ~0.1


Summary

Blocking of central support gives good results for the geometry

Interconnectivity: ends within tolerances (WP08).

Aperture: Magnets can be classified to be good for the different LHC positions to take into account all other constraints with good margin.

Data bases and software tools for analysis available for MB and for MQ

SSS still needs efforts (analysis of measurements and geometry). No alarms at the present

Verification set of 5 spool pieces (MCS) in assembled cold mass to be measured and analyzed

Cold-warm relations for MB still to be measured and analyzed

Magnet stability with time has to be monitored (results from WP09)


Acknowledgements

Thanks to the following people:Marco La China Walter ScandaleJerome BeauquisGregory Bevillard

Marta BajkoRocio ChamizoMirco CoccoliJuan GarciaMarco Buzio

Dominique MissiaenPatrick Winkes

Monique DupontBernard JeanneretStephane Fartoukh

Fabien Seyvet

workshop chamonix xiv, elena wildner at/mas1 e. wildner geometry of the main bends and the short...

Documents

measurements of magnetic

mechanic axis

dipole magnet available

cern available

geometric analysis data

chamonix xiiih axis

shaperesults mbshapecorrectors

magnetic measurementa