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MTE status and plansMTE status and plans

M. GiovannozziM. Giovannozzi

Recap of situation (from IEFC workshop)Recap of situation (from IEFC workshop)

Orbit measurementsOrbit measurements

PS instrumentation statusPS instrumentation status

List of measurements and studiesList of measurements and studies

ResourcesResources

Milestones (tentative)Milestones (tentative)

AcknowledgementsAcknowledgements: O. Brüning, P. Collier, R. : O. Brüning, P. Collier, R. Garoby, S. Gilardoni, V. Mertens, R. Jones and Garoby, S. Gilardoni, V. Mertens, R. Jones and BI expertsBI experts

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Recap of situationRecap of situation

The effects that blocked MTE in 2010The effects that blocked MTE in 20101.1. Activation of septum 16Activation of septum 162.2. Fluctuation of trapping efficiency in the PSFluctuation of trapping efficiency in the PS3.3. Injection trajectories fluctuations in SPSInjection trajectories fluctuations in SPS

Action plan from IEFC workshop:Action plan from IEFC workshop:Initially mainly focus on the PS toInitially mainly focus on the PS to

Studies for new extraction schemeStudies for new extraction schemeClosure of slow bump and stability of extraction Closure of slow bump and stability of extraction conditions.conditions.Tests of energy fluctuations, POPS, etc.Tests of energy fluctuations, POPS, etc.We should aim at drawing conclusions on new We should aim at drawing conclusions on new extraction/dummy septum by June/July this year.extraction/dummy septum by June/July this year.

Then resume SPS injection to studyThen resume SPS injection to studyInjection (trajectory, optics)Injection (trajectory, optics)Overall performanceOverall performance

Delay of ~ two Delay of ~ two months on months on these itemsthese items

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Orbit measurementsOrbit measurements

Create stables islands and kick a pencil beam Create stables islands and kick a pencil beam in one island to check orbit stability: large in one island to check orbit stability: large cycle-to-cycle fluctuations observedcycle-to-cycle fluctuations observed

Units are Units are tenths of tenths of mm!mm!

Different Different colours refer colours refer to different to different cyclescycles

Crash programme to find Crash programme to find source and, in parallel, source and, in parallel, check whether this was a check whether this was a measurement artifact.measurement artifact.Last Thursday BI experts Last Thursday BI experts found the solution!found the solution!

Same scale as previous case: fluctuations have disappearedSame scale as previous case: fluctuations have disappeared

Now, the real Now, the real measurements measurements can start!can start!

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PS instrumentation status (MTE)PS instrumentation status (MTE)

Instrumentation not (always) performing to Instrumentation not (always) performing to (pushed?) needs of MTE. (pushed?) needs of MTE. Decision to team up with LIU.Decision to team up with LIU.Meeting organised with Rhodri: Meeting organised with Rhodri:

Technical issues (in particular of orbit measurement)Technical issues (in particular of orbit measurement)Structure for follow up of technical issuesStructure for follow up of technical issuesPOPS reconnection and tune measurement issuePOPS reconnection and tune measurement issue

Tune measurement with POPS: Noise Tune measurement with POPS: Noise on pick-up or also effect on beam?on pick-up or also effect on beam?

Orbit measurement seems Orbit measurement seems currently operational.currently operational.Next systems to be used:Next systems to be used:

Tune measurementTune measurementBCTs in TT2BCTs in TT2(FWS are already being (FWS are already being reviewed because of LIU reviewed because of LIU and LHC beams)and LHC beams)

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List of measurements and studies - IList of measurements and studies - I

Trajectory fluctuations in SPSTrajectory fluctuations in SPSClosure of bumps (slow and fast) in the PSClosure of bumps (slow and fast) in the PS

New extraction scheme using SEH31New extraction scheme using SEH31Pursue studiesPursue studies

Trapping fluctuationsTrapping fluctuationsMeasure cycle-to-cycle reproducibility of chromaticity at Measure cycle-to-cycle reproducibility of chromaticity at flat top.flat top.Setting up of trapping, crossing resonance from above at Setting up of trapping, crossing resonance from above at 14 GeV/c. 14 GeV/c. This requires changing the signs of octupoles This requires changing the signs of octupoles and hence Q’’>0 (this allows testing whether local and hence Q’’>0 (this allows testing whether local negative Q’ might be a source of fluctuations).negative Q’ might be a source of fluctuations).Setting up of trapping, crossing resonance at 2 GeV. Setting up of trapping, crossing resonance at 2 GeV. This This configuration is below transition energy, hence Q’<0 for configuration is below transition energy, hence Q’<0 for stability. Hence Q’’<0 (as we have now) should not be an stability. Hence Q’’<0 (as we have now) should not be an issue. Furthermore, we might get rid of PWFs and F8L.issue. Furthermore, we might get rid of PWFs and F8L.Setting up a transverse splitting in SPS?Setting up a transverse splitting in SPS?

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List of measurements and studies - IIList of measurements and studies - II

New extraction scheme using SEH31New extraction scheme using SEH31QKE is mandatory to close the fast bump (not good for QKE is mandatory to close the fast bump (not good for aperture).aperture).Check trajectory extracted beamlets.Check trajectory extracted beamlets.Extraction of fifth turn.Extraction of fifth turn.

Dummy septum in SS15Dummy septum in SS15Check extraction trajectories for MTE in SS15.Check extraction trajectories for MTE in SS15.Check also trajectories of other fast extractions (e.g., nTOF Check also trajectories of other fast extractions (e.g., nTOF and LHC).and LHC).Relocation of Relocation of -jump quadrupole.-jump quadrupole.Very pertinent comment by Oliver at the IEFC workshop: Very pertinent comment by Oliver at the IEFC workshop: source of SPS trajectory fluctuations should not affect PS source of SPS trajectory fluctuations should not affect PS trajectories in SS15!trajectories in SS15!

Faster kickers optionFaster kickers optionMainly for ABT, ABP to check the impact on losses.Mainly for ABT, ABP to check the impact on losses.

0 100 200 300 400 500 600 700

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QK

E73

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BETX new fast31 QKE16BETX new fast31 QKE162

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QK

E5

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QK

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QK

E73

CT

X new fast31 QKE16X new fast31 QKE162

ResourcesResources

Beam dynamics studies: Beam dynamics studies: extremely small group of people: extremely small group of people:

Fraction of two staffFraction of two staff

1 fellow (re-oriented to MTE from PS2 studies in March 2011)1 fellow (re-oriented to MTE from PS2 studies in March 2011)

1 fellow (ending in October)1 fellow (ending in October)

1 PhD starting in September (to be trained)1 PhD starting in September (to be trained)

PS activities: PS activities: we rely heavily on OP for setting up (this year for the new we rely heavily on OP for setting up (this year for the new extraction studies) and systematic data taking.extraction studies) and systematic data taking.

SPS activities: SPS activities: We depend critically on OP for pushing the setting up and We depend critically on OP for pushing the setting up and the studies at the. However, we do not consider to resume the studies at the. However, we do not consider to resume these activities before the end of the summer.these activities before the end of the summer.

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Milestones (tentative)Milestones (tentative)

POPS reconnection might impact on MTE.POPS reconnection might impact on MTE.

To gain flexibility it is proposed not to restrict To gain flexibility it is proposed not to restrict KFA21 polarity change to injectors’ TS (time KFA21 polarity change to injectors’ TS (time required ~1 h access – carefully planned).required ~1 h access – carefully planned).

End of Aug./Beg of Sep.: report on electrostatic End of Aug./Beg of Sep.: report on electrostatic septum extraction scheme and losses vs. kickers’ septum extraction scheme and losses vs. kickers’ rise time.rise time.

End of September: results on special End of September: results on special configurations for trapping.configurations for trapping.

October: SPS tests.October: SPS tests.

November: conclusions on dummy septum.November: conclusions on dummy septum.

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