Summaries and conclusions of the MTE Workshop

MG - MTE Workshop 27/09/2010MG - MTE Workshop 27/09/2010 11

Summaries and conclusions of Summaries and conclusions of the MTE Workshopthe MTE Workshop

S. Gilardoni, M. GiovannozziS. Gilardoni, M. Giovannozzi

General commentsGeneral comments

Short-term actionsShort-term actions

Medium-term actionsMedium-term actions

Long-term actionsLong-term actions

AcknowledgementsAcknowledgements: speakers and participants : speakers and participants to the MTE Workshopto the MTE Workshop


General comments - IGeneral comments - I

Goal of the WorkshopGoal of the Workshop

Review current beam status and issuesReview current beam status and issuesReview current hardware issuesReview current hardware issuesPropose possible mitigation measuresPropose possible mitigation measuresDefine a strategy to have an operational MTEDefine a strategy to have an operational MTE

Very interesting presentations and fruitful Very interesting presentations and fruitful discussions!discussions!Actions grouped into:Actions grouped into:

Short-term -> end 2010: Short-term -> end 2010: understand fluctuations; put back understand fluctuations; put back MTE in operation on one SPS cycle; provide input for MTE in operation on one SPS cycle; provide input for longer-term studies (hardware modifications).longer-term studies (hardware modifications).Medium term -> 2011: Medium term -> 2011: study a new extraction scheme to study a new extraction scheme to mitigate activation of septum 16.mitigate activation of septum 16.Long term -> 2012: Long term -> 2012: make use of the long shut down to make use of the long shut down to implement changes needed for an operational MTE.implement changes needed for an operational MTE.


General comments - IIGeneral comments - II

Review current beam status and issuesReview current beam status and issuesMTE beam successfully delivered to SPS and used till June.MTE beam successfully delivered to SPS and used till June.Typical intensities around 2×10Typical intensities around 2×101313 ppp pppPromising performance in the SPS Promising performance in the SPS Issues:Issues:

Fluctuations in the trapping efficiencyFluctuations in the trapping efficiencyEnergy fluctuations observed in SPSEnergy fluctuations observed in SPSActivation of magnetic septum due to de-bunched beam Activation of magnetic septum due to de-bunched beam

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General comments - IIIGeneral comments - III

Fluctuations in the trapping efficiencyFluctuations in the trapping efficiencyMeasurement campaign launched toMeasurement campaign launched to

optimise parameters optimise parameters find correlationsfind correlationsuncover source of fluctuationsuncover source of fluctuations

Source of fluctuations not found so far.Source of fluctuations not found so far.

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Each colour represents a different study.Each colour represents a different study.

The sample has not exactly the same size for The sample has not exactly the same size for all studiesall studies

Amplitude of Amplitude of fluctuations not fluctuations not much affected by much affected by usual parameters usual parameters (sextupoles, (sextupoles, octupoles, damper).octupoles, damper).Frequency seems to Frequency seems to be affected by be affected by chromaticity…chromaticity…


General comments - IVGeneral comments - IV

Fluctuations in the trapping efficiencyFluctuations in the trapping efficiencyMeasurements of stability of hardware parameters Measurements of stability of hardware parameters launched as well:launched as well:

Analysis of low-energy quadrupoles to be completedAnalysis of low-energy quadrupoles to be completedAnalysis of: sextupoles, octupoles, bumpers, Figure-of-eight Analysis of: sextupoles, octupoles, bumpers, Figure-of-eight loop showed no oscillationsloop showed no oscillationsAnalysis of pole-face-windings (narrow circuits) showed some Analysis of pole-face-windings (narrow circuits) showed some oscillationsoscillations

Correlation with Correlation with trapping to be trapping to be studied.studied.


Short-term actions - IShort-term actions - I

PSPSComplete analysis of hardware data (low-energy Complete analysis of hardware data (low-energy quadrupoles)quadrupoles)Repeat tests of low-energy quadrupole stability with special Repeat tests of low-energy quadrupole stability with special measurement device.measurement device.Study correlation of PFW-N fluctuations with spill.Study correlation of PFW-N fluctuations with spill.Check performance when crossing resonance from above.Check performance when crossing resonance from above.Check impact of longitudinal parameters on adiabaticity of Check impact of longitudinal parameters on adiabaticity of process.process.Repeat tests with different tune curves.Repeat tests with different tune curves.Improve functions of OMTs, ODEs.Improve functions of OMTs, ODEs.


Short-term actions - IIShort-term actions - II

SPSSPSComplete steering of TT10 (including DFAs), improve Complete steering of TT10 (including DFAs), improve injection in the SPS, accelerate, etc., i.e. have again an injection in the SPS, accelerate, etc., i.e. have again an operational MTE beam on one SPS cycle.operational MTE beam on one SPS cycle.Study fluctuations:Study fluctuations:

Determine which islands is measured in TT10.Determine which islands is measured in TT10.Compare with corresponding turn in SPS and verify Compare with corresponding turn in SPS and verify fluctuations.fluctuations.Study systematically fluctuations in SPS for the various Study systematically fluctuations in SPS for the various injected turns.injected turns.Correlate with B-field fluctuation in PS (already done, but to Correlate with B-field fluctuation in PS (already done, but to be repeated in a more systematic way and be repeated in a more systematic way and even with other even with other beams more suited to this type of measurementbeams more suited to this type of measurement).).

Scheduling is difficult (screens and ions not compatible)!Scheduling is difficult (screens and ions not compatible)!Also, intensity should be adapted to the actual needs and Also, intensity should be adapted to the actual needs and the use of the PS internal dump should be minimised.the use of the PS internal dump should be minimised.

We need a strong support from SPS team!We need a strong support from SPS team!


Short-term actions - IIIShort-term actions - III

SPSSPSNB: to complete the previous studies we need:NB: to complete the previous studies we need:

YASP fixed as it seems that there is a discrepancy YASP fixed as it seems that there is a discrepancy between what is sent to the hardware and what is between what is sent to the hardware and what is shown… shown… Key assumption: Key assumption: pick-ups in TT10 are to be considered pick-ups in TT10 are to be considered in working conditions!in working conditions!

It would be nice to have some TT10 pick-ups on It would be nice to have some TT10 pick-ups on samplers!samplers!

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Example of aperture scan performed with TT10 pick-upsExample of aperture scan performed with TT10 pick-upsSampler for TT2 pick-upSampler for TT2 pick-up


Medium-term actions - IMedium-term actions - I

PS-Booster PS-Booster Review the generation of the PS beam Review the generation of the PS beam to reduce vertical emittance.to reduce vertical emittance.

PSPSDamper controlDamper control

Full remote control over parametersFull remote control over parametersNew function generation (CVORG)New function generation (CVORG)

Ppm control of BFA and DFA Ppm control of BFA and DFA (coexistence of CT and MTE). (coexistence of CT and MTE). Prioritisation might be applied Prioritisation might be applied (BFAp, BFAs, DFAs)(BFAp, BFAs, DFAs)TT2 pick-upsTT2 pick-ups

Improve performance, operational Improve performance, operational statusstatusMake YASP compatible with 5-Make YASP compatible with 5-turn steering in TT2turn steering in TT2

Vertical profiles in SPSVertical profiles in SPS

CTCT

MTEMTE


Medium-term actions - IIMedium-term actions - II

INCA stability: MTE user very sensible to parameters INCA stability: MTE user very sensible to parameters change. It is not an MD user!change. It is not an MD user!InstrumentationInstrumentationNew wire scanners in preparation (one to be installed during the New wire scanners in preparation (one to be installed during the next winter technical stop): approval process of the new hardware next winter technical stop): approval process of the new hardware should be launched soon.should be launched soon.Complete tests of new BLMs: essentials to cross-check BCTs data Complete tests of new BLMs: essentials to cross-check BCTs data and extrapolate lossesand extrapolate lossesVigorous plan of improvement of the BCTs. This includes cross-Vigorous plan of improvement of the BCTs. This includes cross-calibration of electronic cards, removal of automatic calibration, calibration of electronic cards, removal of automatic calibration, improvement of the amplifiers. The target is to reach a 1% rms improvement of the amplifiers. The target is to reach a 1% rms reproducibility shot-to-shot. On the longer-time scale the SPS BCTs reproducibility shot-to-shot. On the longer-time scale the SPS BCTs should be deployed (depending n resources). Of course, the relative should be deployed (depending n resources). Of course, the relative performance is more than enough to set-up the splitting process.performance is more than enough to set-up the splitting process.Limitations preventing orbit measurement at extraction for Limitations preventing orbit measurement at extraction for CNGS/SFTPRO beams should be analysed and possible mitigation CNGS/SFTPRO beams should be analysed and possible mitigation measures proposed.measures proposed.


Long-term actions - ILong-term actions - I

Mitigation measures for extraction losses and Mitigation measures for extraction losses and magnetic septum activationmagnetic septum activation

Shorter rise time of the extraction kickers: new PFN, Shorter rise time of the extraction kickers: new PFN, magnets, building!magnets, building!Different longitudinal structure: not acceptable for Different longitudinal structure: not acceptable for SPS.SPS.Thinner magnetic septum: not a real long-term Thinner magnetic septum: not a real long-term solution.solution.Two possibilities (not mutually exclusive)Two possibilities (not mutually exclusive)

Install a dummy septum to shadow the blade of the Install a dummy septum to shadow the blade of the magnetic septum 16 and or install a spoiler in the tank of magnetic septum 16 and or install a spoiler in the tank of septum 16septum 16Use the electrostatic septum 31Use the electrostatic septum 31


Long-term actions - IILong-term actions - II

Install a dummy septum to shadow the blade of the Install a dummy septum to shadow the blade of the magnetic septum 16magnetic septum 16

The extraction scheme would remain conceptually the The extraction scheme would remain conceptually the same as the current one.same as the current one.SS15 is the only choice for installing the deviceSS15 is the only choice for installing the deviceAbout 40 cm availableAbout 40 cm availableDHZ15: dipole for closed DHZ15: dipole for closed orbit distortion correction orbit distortion correction and MTE slow bump (about and MTE slow bump (about 24 cm long)24 cm long)Triplet quadrupole for Triplet quadrupole for --jump (about 24 cm long)jump (about 24 cm long)


Long-term actions - IIILong-term actions - III

Use the electrostatic septum 31. The standard MTE Use the electrostatic septum 31. The standard MTE scheme is modified as follows:scheme is modified as follows:

Two slow bumps are used, around SEH31, around SMH16.Two slow bumps are used, around SEH31, around SMH16.A single fast bump is generated around SEH31.A single fast bump is generated around SEH31.The split beam will cross the foil of the electrostatic septum The split beam will cross the foil of the electrostatic septum (~0.2 mm against ~3 mm of SMH16) .(~0.2 mm against ~3 mm of SMH16) .

Kicked islandKicked island

Beam losses will occur only Beam losses will occur only during the rise of the kickers.during the rise of the kickers.The SEH31 will kick the island The SEH31 will kick the island beyond the SMH16.beyond the SMH16.New fast bump generated by:New fast bump generated by:KFA21, BFA21, KFA9, KFA13KFA21, BFA21, KFA9, KFA13


Long-term actions - IVLong-term actions - IV

Paper work needed for both proposal (studies launched Paper work needed for both proposal (studies launched immediately):immediately):

Dummy septum or spoiler in the tank of septum 16: detailed Dummy septum or spoiler in the tank of septum 16: detailed simulations of beam-septum interaction, layout.simulations of beam-septum interaction, layout.New extraction scheme: check trajectories, aperture, possibility New extraction scheme: check trajectories, aperture, possibility of re-using the existing hardware.of re-using the existing hardware.

Experimental tests to be envisaged for second proposal: Experimental tests to be envisaged for second proposal: to be performed at the beginning of 2011. In case of a to be performed at the beginning of 2011. In case of a polarity change is required, implement a system during polarity change is required, implement a system during the winter shutdown.the winter shutdown.In the meantime:In the meantime:

No intervention implying dismantling of CT should be performed. No intervention implying dismantling of CT should be performed. Coexistence between CT and MTE should be assumed until 2013.Coexistence between CT and MTE should be assumed until 2013.It should be assumed that the magnetic septum is to be replaced It should be assumed that the magnetic septum is to be replaced during the 2012 shut down.during the 2012 shut down.A Phase II for the DFAs is still the option to be pursued.A Phase II for the DFAs is still the option to be pursued.The long-term future of the electrostatic septum will be assessed The long-term future of the electrostatic septum will be assessed in the coming months.in the coming months.

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Summaries and conclusions of the MTE Workshop