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CLIC Stabilization (Linac and FF)CLIC Stabilization (Linac and FF)

Input for a list of actionsInput for a list of actions

A basis for this afternoon A basis for this afternoon discussions !discussions !

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Tasks (Draft)Tasks (Draft) (see also next talk: FP7 WP3 Task2)(see also next talk: FP7 WP3 Task2)

Demonstrate 1nm quadrupoles stability above 1Hz Demonstrate 1nm quadrupoles stability above 1Hz (Linac)(Linac) Demonstrate 0.1nm stability above 5Hz Demonstrate 0.1nm stability above 5Hz (Final Focus)(Final Focus) Differences compared to previous studiesDifferences compared to previous studies

– 0.1 nm is beyond what we have shown0.1 nm is beyond what we have shown– apply stabilization in an accelerator environmentapply stabilization in an accelerator environment– achieve 1nm with realistic equipment (a complete system), not achieve 1nm with realistic equipment (a complete system), not

simple elements on a special tablesimple elements on a special table– verify performance with (two) different methodsverify performance with (two) different methods

Characterize vibrations/noise sources in an acceleratorCharacterize vibrations/noise sources in an accelerator Compatibility with alignmentCompatibility with alignment Sensitivity to relaxed specifications Sensitivity to relaxed specifications

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Actions list Actions list (1)(1) Apply to quadrupole stabilization (series production) and to final focus Apply to quadrupole stabilization (series production) and to final focus

(technological limit).(technological limit).

Characterize vibrations/noise sources in an Characterize vibrations/noise sources in an accelerator (CERN, DESY,…)accelerator (CERN, DESY,…)

Overall designOverall design– Compatibility of linac supporting system with stabilization (including Compatibility of linac supporting system with stabilization (including

mechanical design): eigenfrequencies, coupling between girders, mechanical design): eigenfrequencies, coupling between girders, coupling of mechanical feedback with beam dynamics feedback,… coupling of mechanical feedback with beam dynamics feedback,… (CERN, LAPP, DESY,…)(CERN, LAPP, DESY,…)

– Integration of all the final focus features: types of supporting Integration of all the final focus features: types of supporting structures, coupling with vertex detector, forward detectors,… structures, coupling with vertex detector, forward detectors,… (LAPP, CERN,…)(LAPP, CERN,…)

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Actions list (2)Actions list (2) SensorsSensors

– Develop and test sensors (Industry, ULB, INSALyon, CERN, LAPP)Develop and test sensors (Industry, ULB, INSALyon, CERN, LAPP)– Calibrate by comparison. Use of interferometer (OXFORD). Use of other Calibrate by comparison. Use of interferometer (OXFORD). Use of other

techniques. Create a reference test set-up (at CERN?).techniques. Create a reference test set-up (at CERN?).

ActuatorsActuators– Understand the behavior of the CERN table. Acquire a second one with Understand the behavior of the CERN table. Acquire a second one with

dimensions better adapted to the final focus.dimensions better adapted to the final focus.– Develop and test various damping techniques (passive and active) Develop and test various damping techniques (passive and active)

(LAPP, CERN,…)(LAPP, CERN,…)

FeedbackFeedback– Develop methodology to tackle with multi degrees of freedom (large Develop methodology to tackle with multi degrees of freedom (large

frequency range, multi-elements) (CERN,…)frequency range, multi-elements) (CERN,…)– Apply software to various combinations of sensors/actuators and Apply software to various combinations of sensors/actuators and

improve resolution (noise level) (LaVista, CERN, …)improve resolution (noise level) (LaVista, CERN, …)

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Actions list (3)Actions list (3)

Overall system analysisOverall system analysis– Stability, bandwidth,… (CERN, LaVista)Stability, bandwidth,… (CERN, LaVista)– Faults analysis and tolerance (CERN, LaVista)Faults analysis and tolerance (CERN, LaVista)– Sensitivity to relaxed specifications (e.g. factor 2 or 5)Sensitivity to relaxed specifications (e.g. factor 2 or 5)

Integrate and apply to linac (e.g. CLEX) and final focus Integrate and apply to linac (e.g. CLEX) and final focus prototypes (e.g. ATF2) (LAPP, OXFORD, CERN, PSI, prototypes (e.g. ATF2) (LAPP, OXFORD, CERN, PSI, DESY,…)DESY,…)