Agenda

Alignment/Positionning

1Inner triplet review CERN 24-25 april 2007

Agenda

Movements during transport

ReFiducialisation at CERN

Alignement in the tunnel

Conclusions



OVERVIEW

The fiducialisation is done at FNAL with the SSW CERN has received all files with the fiducialisation

values At CERN, only a verification was foreseen to check

the position of the cold mass(blocks)/cryostat(fiducials)

It was done on 10 first magnets No important vert. and trans. movements Some important long. movements

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longitudinalNIP IP NIP IP avg

HCLQXA_001_FL000006 - - - - -0.40HCLQXB_001-FL000010 - - - - -0.69HCLQXC_001-FL000008 - - - - -1.26HCLQXC_001_FL000001 0.16 -0.07 0.24 -0.06 9.18 recryostated after arrival with broken spiderHCLQXB_001-FL000011 - - - - 0.66HCLQXA_001_FL000007 - - - - 0.25HCLQXA_001-FL000009 - - - - -2.45HCLQXB_001-FL000009 - - - - 0.20HCLQXC_001-FL000002 0.40 -0.54 -0.12 -1.18 -1.72HCLQXC_001-FL000004 - - - - -1.34HCLQXB_001-FL000005 -0.17 -0.80 0.44 0.37 -3.74HCLQXA_001-FL000008 - - - - -1.04HCLQXA_001-FL000005 - - - - -0.45HCLQXB_001-FL000003 - - - - 1.07 no CM referencesHCLQXC_001-FL000007 - - - - 4.20HCLQXC_001-FL000003 0.38 0.69 0.43 -0.44 0.96HCLQXB_001-FL000004 -0.32 -0.29 0.85 0.61 0.17HCLQXA_001-FL000001 0.66 0.04 -0.45 0.21 0.93HCLQXA_001-FL000004 -0.41 -0.47 0.07 -0.24 -0.91HCLQXB_001-FL000008 - - - - 0.85HCLQXC_001-FL000006 - - - - 2.99HCLQXC_001-FL000005 - - - - -0.47HCLQXB_001-FL000006 - - - - 1.10HCLQXA_001-FL000002 0.58 -0.25 0.20 -1.12 3.89HCLQXA_001-FL000003 -0.46 -1.38 -2.01 0.75 -26.79 brokenHCLQXB_001_FL000001 0.29 1.05 -0.27 -0.90 - no CM referencesHCLQXB_001-FL000002 - - - - - not at cernHCLQXB_001-FL000007 - - - - - not at cernHCLQXC_001-FL000009 - - - - 2.57

Identifier radial verticalmovement cold mass/cryostat



OVERVIEW

AT CERN between SMI2 and tunnel

The HCLQXC_001-FL000006 in position Q3R8 was measured in the tunnel and a movement of the

CM/cryostat of 6mm in the long. direction was detected wrt the last measurement in SMI2

It was put back to its nominal position just by pushing the CM against the cryostat. No mechanical modification was done

The question was araised by TS/SU : What will happen during a cool down if it moves so easily ? No answer

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OVERVIEW

Because of deviations between FNAL and CERN measurementsUncertainties due to the stability of the spiders

it was decided to remeasure/recalculate the fiducialisation of all the magnets using :

measurements inside the cold bore tubes to determine Y axis (CERN)The roll angle for the xy plane (FNAL)The long. origine (FNAL)with an accuracy of +- 5mm

And in some cases to make complementary Magnetic measurements with AC mole (CERN)Magnetic measurements with SSW (CERN)

Determination of a new set of parameters for all the magnets

This new geometry was used by MEB to approve them

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OVERVIEW

During the fiducialisation operation, the position of the tubes at each extremity are measured and the position determined in the new co-ordinate system

The docs were put in MTF if we were to apply the tolerances used for Arc dipoles/SSSs, there would have been a lot of NCs to openBut we were told not open them because

a new interface spec. was in preparationThe FNAL people were to realise the interconnection work themselves and supposed to cope with their NCs

Effectively, the new spec. LHC-LQX-ES-0012 was established and almost all the NC disappeared. The remaining ones were opened in MTF.Angles of flanges out of tolerance.

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OVERVIEW

Longitudinal position

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NIP IP NIP IP avg NIP IP avgHCLQXA_001_FL000006 -2.1 -3.8 -1.8 -4.1 -2.9 -1.8 -2.7 -2.3HCLQXB_001-FL000010 -6.8 -10.9 -7.0 -10.7 -8.8 -7.6 -7.2 -7.4HCLQXC_001-FL000008 -1.2 -1.3 -1.0 -1.4 -1.2 -1.4 0.5 -0.4HCLQXC_001_FL000001 -6.2 -8.3 -6.3 -8.3 -7.3 -4.4 -4.3 -4.3HCLQXB_001-FL000011 4.2 2.7 4.3 2.4 3.4 -5.9 -5.0 -5.4HCLQXA_001_FL000007 -6.7 -9.0 -6.4 -9.3 -7.9 -7.5 -9.1 -8.3HCLQXA_001-FL000009 -1.0 -2.2 -0.9 -2.4 -1.6 -1.8 -1.3 -1.5HCLQXB_001-FL000009 0.9 -0.3 1.6 -1.0 0.3 - - -HCLQXC_001-FL000002 2.2 -0.2 1.0 -1.0 0.0 -2.1 -1.3 -1.7HCLQXC_001-FL000004 -0.9 -4.5 -0.2 -5.2 -2.7 -0.1 -0.2 -0.1HCLQXB_001-FL000005 5.3 4.4 5.3 4.4 4.9 5.5 7.1 6.3HCLQXA_001-FL000008 -6.8 -8.3 -6.7 -8.5 -7.6 -8.3 -7.8 -8.1HCLQXA_001-FL000005 -7.6 -9.5 -7.3 -9.8 -8.5 -5.2 -4.7 -4.9HCLQXB_001-FL000003 12.7 10.7 11.2 8.8 10.0 0.0 0.6 0.3HCLQXC_001-FL000007 -5.7 -7.7 -5.8 -7.6 -6.7 - - -HCLQXC_001-FL000003 6.7 4.6 6.8 4.5 5.6 3.6 4.7 4.2HCLQXB_001-FL000004 0.8 0.8 1.1 0.4 0.7 4.5 5.2 4.8HCLQXA_001-FL000001 3.7 0.6 4.4 0.3 2.4 -3.8 -3.8 -3.8HCLQXA_001-FL000004 2.7 0.1 3.2 -0.4 1.4 -1.9 -1.8 -1.8HCLQXB_001-FL000008 -0.4 -3.7 -0.1 -4.1 -2.1 -5.0 -6.4 -5.7HCLQXC_001-FL000006 -0.2 -3.2 0.0 -3.4 -1.7 - - -HCLQXC_001-FL000005 3.0 0.6 3.2 0.4 1.8 3.0 3.8 3.4HCLQXB_001-FL000006 -4.6 -7.0 -4.6 -7.1 -5.9 -11.3 -10.1 -10.7HCLQXA_001-FL000002 1.8 0.2 2.0 -0.1 0.9 - - -HCLQXA_001-FL000003 -3.9 -6.1 -4.1 -6.1 -5.1 -1.4 -0.3 -0.9HCLQXB_001_FL000001 - - 2.2 -2.2 0.0 -1.9 -0.5 -1.2HCLQXB_001-FL000002HCLQXB_001-FL000007HCLQXC_001-FL000009

rms 5.0 5.2 4.8 4.9 4.8 4.3 4.7 4.5

Dy deviations to nominal at CERNCryostat FlangeIdentifier

Dy deviation to nominal at FNALCBT CBT



OVERVIEW

Longitudinal problem :- The longitudinal errors of the CBT was solved by giving

shifts-But in several cases , the physics people are not happy with the long.position chosen-The problem is more difficult to solve when the offset is NOT the same for CBT and cryostat : in this case we are not in the middle of the range for the jacks once the magnet is aligned

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OVERVIEW

Modification of design of spiders :- It has to be check that there is no movement of the cold

mass/cryostat- A new fiducialisation is no longer possible because the magnets are equipped with beam screens (and BPM fro Q2)- A check of the cold mass/cryostat could be done in situ but there are not enough references on the cold mass (only two blocks and in some cases 0). Temporary blocks must be installed and measured before and after the modification

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OVERVIEW

Specifications of the alignment are in LHC-G-ES-0016- Inner triplet mean line wrt LHC (LSS) line : 0.3mm(rms) in

X, 0.1mm(rms) in Z- One magnet wrt the inner triplet mean line in stability :

several microns- Inner triplet mean line wrt inner triplet on the other side :

-0.2mm(rms) in X, 0.1mm(rms) in Z for IR2 and 8-0.1mm(rms) in X, 0.1mm(rms) in Z for IR1 and 5

Sequence of the operations :- The first alignment takes place while the magnets are NOT

connected to their neighbours- Installation of the Survey monitoring equipment : HLS +

WPS+ motors- Smoothing operation done when the magnets are

connected and cold. Realignment could be done manually or automatically

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OVERVIEW

Specifications for the motors :- The spec is LGC-GIJ-CI-0003 - There is no possibility to align in the long.(Y) direction. No

constraints should be present in this direction. No test was done for this situation

- Possibility to realign in the vertical (Z) and transversal direction(X) in a range of +- 2mm. The transverse force induced by slope, tilt and the interconnect should not exceed 1T

- Therefore the new design of tie rods should NOT transfer the efforts into the jacks

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Movement during vacuum pumping

• No mvt of jack/floor• Mvt of jack/cryostat• => long. constraint in the jackAlig

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due to tie rod• This has to be avoided



OVERVIEW

Check fiducialisation after modification

To take into consideration for design modification- The reinforcement of the tie rods should not rigidify the

interconnect so that the transverse force exceeds 1T- The modification should not transfer the long. efforts into the jacks

which are not designed for that purpose

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Agenda

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