Movements of the low beta quadrupoles

MOVEMENTS OF THE LOW BETA QUADRUPOLES

D. Missiaen

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LBOC - 21/11/2011 D. Missiaen

-Realignments operations-Vertical and Roll angle position- Tranversal position

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LBOC - 22/11/2011

IR Date reasons1 August 2009 General Survey2 January 2010 General Survey

5 August 2009 General Survey

February 2011 Tilt pb on Q3-Q2LQ2 and Q3R also moved in V

On right side major incident

8 January 2010 General Survey

February 2011 Tilt pb on Q2 and Q1LQ1 and Q2R

D. Missiaen

Realignments

4

LBOC - 22/11/2011

Points in the cavern calculated in Summer 2009 and considered as fixed Relative movements measured with permanent monitoring system D.

Missiaen

Vertical position : calculation principle

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IR1- vertical

Global tendancy to go upwards Realignment ot be envisaged for Q3 and Q2L and Q2 and Q3R

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LBOC - 22/11/2011 All within +-0.2 mrad – No degradation D.

Missiaen

IR1- Roll angle

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IR2- vertical

Very stable except Q1R2

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LBOC - 22/11/2011 Very stable – No degradation D.

Missiaen

IR2- Roll angle

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IR5- vertical

Q2L is a bit strange – otherwise rather stable

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LBOC - 22/11/2011 After correction fo 2011 : OK D.

Missiaen

IR5- Roll angle

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IR8- vertical

Tendancy to go upwards on the Left side – Right is rather stable

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IR8- roll angle

Q3 and Q2L are a bit far

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LBOC - 22/11/2011

In IR 1 and 5, 2 points in the SU gallery were calculated in Summer 2009 and considered as fixed

In pt 2 and 8, calculation is fixed on Q1 and Q3 on each side. For this purpose new sensors, independant from triplets, have been installed beginning 2011D.

Missiaen

Transversal position : calculation principle

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IR1- transversal

Slight degradation - Rotation of many magnets especially Q2L

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IR2- transversal

Very small movements

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IR5- transversal

Relative degradation on the Left side. Ok on right side

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IR8- transversal

Very few data ….. But seems to be stable

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LMC - 02/03/2011

Absolute Vertical measurements will be done during the Winter TS No movement will be done until we have the results IP1 :

V : Q3 and Q2 on each side to be lower H : rotation of Q2L

IP2 V : Q1R to be lowered H : nothing

IP5 V : Q3L to be lowered H : all magnets on the L side

IP8 V : Q3 and Q2L to be lowered, roll angle to be adjusted H : nothing

D. Missiaen

Movements proposed

Movements of the low beta quadrupoles

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