mte status and outlook for 2012

MG - IEFC Workshop 2012MG - IEFC Workshop 2012 11

MTE status and outlook for MTE status and outlook for 20122012

M. GiovannozziM. Giovannozzi

IntroductionIntroduction

Recap of 2011 activitiesRecap of 2011 activities

Activities before LS1Activities before LS1

MilestonesMilestones

AcknowledgementsAcknowledgements: G. Arduini, H. Bartosik, J. : G. Arduini, H. Bartosik, J. Borburgh, R. Brown, M. Buzio, S. Damjanovic, S. Borburgh, R. Brown, M. Buzio, S. Damjanovic, S. Gilardoni, C. Hernalsteens, M. Hourican, A. Gilardoni, C. Hernalsteens, M. Hourican, A. Lachaize, Y. Papaphilippou, R. Steerenberg, and Lachaize, Y. Papaphilippou, R. Steerenberg, and many colleagues in BI, OP, RF, DGS-RP, and TE-many colleagues in BI, OP, RF, DGS-RP, and TE-ABT, TE-MSC…ABT, TE-MSC…8/3/20128/3/2012


Introduction - IIntroduction - I

The three fronts that are being investigatedThe three fronts that are being investigatedActivation of septum 16Activation of septum 16

Generated by longitudinal bunch structureGenerated by longitudinal bunch structureImpact on cool down time for intervention in septum Impact on cool down time for intervention in septum areaarea

Fluctuation of trapping efficiency in the PSFluctuation of trapping efficiency in the PSLong campaign of beam measurements to find Long campaign of beam measurements to find source (not yet identified)source (not yet identified)Huge amount of beam data analysed. Huge amount of beam data analysed.

Injection trajectories fluctuations in SPSInjection trajectories fluctuations in SPS

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Introduction - IIIntroduction - II

Mitigation measures proposedMitigation measures proposedActivation of septum 16Activation of septum 16

Dummy septum in SS15 Dummy septum in SS15 Hybrid MTE extraction (re-using electrostatic septum Hybrid MTE extraction (re-using electrostatic septum for CT)for CT)

Fluctuation of trapping efficiency in the PSFluctuation of trapping efficiency in the PSInjection trajectories fluctuations in SPSInjection trajectories fluctuations in SPS

Different strategy for beam measurements in Different strategy for beam measurements in 2011.2011.Possibly same source for both issues (magnetic Possibly same source for both issues (magnetic reproducibility of PS main field).reproducibility of PS main field).

Original proposal by BrennanOriginal proposal by Brennan

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Dummy septum Dummy septum solutionsolution

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Current layout of SS15Current layout of SS15

Items under studyItems under studyExtraction trajectories (TOF should be Extraction trajectories (TOF should be

optimised) and tested with beam. optimised) and tested with beam.

Relocation of elements currently in SS15 is completed. Relocation of elements currently in SS15 is completed. Additional elements installed during last TS: Additional elements installed during last TS:

Additional DHZ in SS03Additional DHZ in SS03

Additional gamma-jump quadrupole in SS99.Additional gamma-jump quadrupole in SS99.

Everything is ready for beam tests.Everything is ready for beam tests.

Hardware designHardware designOptimisation and finalisation of the design.Optimisation and finalisation of the design.

Activation and energy deposition studies (including particle Activation and energy deposition studies (including particle tracking).tracking).

Shielding optimisation.Shielding optimisation.

Impedance.Impedance.

Simulation of setting-up with beam.Simulation of setting-up with beam.

Dummy septum: beam studies - IDummy septum: beam studies - I

To make transverse space for the blade of the To make transverse space for the blade of the dummy septum in SS15dummy septum in SS15

Move outwards the MTE beam (light blue)Move outwards the MTE beam (light blue)

Move inwards the TOF beam (green)Move inwards the TOF beam (green)

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Isl. Slow bump

Nominal TOF

Modified fast bump

Courtesy C. HernalsteensCourtesy C. Hernalsteens

Dummy septum: beam studies - IIDummy septum: beam studies - II

Strategy to reduce amplitude at SS15Strategy to reduce amplitude at SS15Reduce slow bump in SS15Reduce slow bump in SS15

Optimise strength of extraction kicker KFA71Optimise strength of extraction kicker KFA71

It turned out that KFA4 (used for MTE – extraction of fifth It turned out that KFA4 (used for MTE – extraction of fifth turn) was useful in gaining transverse space in SS15 turn) was useful in gaining transverse space in SS15 while reducing amplitude in SS09 (where losses were while reducing amplitude in SS09 (where losses were observed with protons).observed with protons).


SS09SS09

SS15SS15

With KFA4With KFA4With KFA4With KFA4

Without KFA4Without KFA4

Without KFA4Without KFA4Courtesy C. HernalsteensCourtesy C. HernalsteensCourtesy C. HernalsteensCourtesy C. Hernalsteens

Dummy septum: beam studies - IVDummy septum: beam studies - IV

Main results:Main results:Space gained ≈ 7 mm Space gained ≈ 7 mm

Measurements to be repeated with protons to increase Measurements to be repeated with protons to increase statistics and check lossesstatistics and check losses


Dummy septum

Improved TOF

Modified fast bump for MTE


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Courtesy M. HouricanCourtesy M. Hourican

Dummy septum: hardware Dummy septum: hardware design - Idesign - I

Downstream Downstream sideside

Blade material: copper or tungsten. Comparable Blade material: copper or tungsten. Comparable performance in terms of absorption.performance in terms of absorption.

Choice: mechanical or impedance.Choice: mechanical or impedance.

Dummy septum: hardware Dummy septum: hardware design - IIdesign - II

8/3/20128/3/2012 MG - IEFC Workshop 2012MG - IEFC Workshop 2012 99Courtesy M. HouricanCourtesy M. Hourican

Shielding material: concrete and marble.Shielding material: concrete and marble.

Shielding dimensions: to be optimised.Shielding dimensions: to be optimised.

Dummy septum: energy Dummy septum: energy deposition - Ideposition - I

1D projection along the 1D projection along the blade length, averaged blade length, averaged over ±1σover ±1σxx in x and over the in x and over the

blade thickness (3mm).blade thickness (3mm).

Maximum value Maximum value

EEmaxmax = (21.0±0.1) J/cm = (21.0±0.1) J/cm33/s/s


MMU15SS15

E [G

eV

/cm

3/s]

Courtesy S. DamjanovicCourtesy S. Damjanovic

Rate for beam loss intensity of 10Rate for beam loss intensity of 101111 p/s p/s


Emax rate [J/cm3/s]

Dummy septum blade 21.0±0.1

Dummy septum tank (8.0±0.1)×10-3

Vacuum chambers and beam screen (1.84±0.02)×10-2

Dummy septum: energy Dummy septum: energy deposition - IIdeposition - II

vacuum chambers and beam screen

Emax = (1.15±0.005)×10-3 GeV/cm3/primary

Courtesy S. DamjanovicCourtesy S. Damjanovic

Extraction with SEH31Extraction with SEH31: recap of CT: recap of CT

Two slow bumps (SS16, SS31)Two slow bumps (SS16, SS31)One fast bump (pedestal and staircase, between One fast bump (pedestal and staircase, between SS21 and SS9)SS21 and SS9)QKE (in SS5/25 and SS25/73)QKE (in SS5/25 and SS25/73)Two septa (SMH16, SEH31)Two septa (SMH16, SEH31)Two kickers Two kickers in TT2 to in TT2 to correct the correct the turn-by-turn turn-by-turn trajectory trajectory differencesdifferences


Hybrid MTE - IHybrid MTE - I

Phase of KFA13 is not suitable for a closed bump Phase of KFA13 is not suitable for a closed bump between 21 and 13.between 21 and 13.

Kicker in 9 will always work at high strength, with Kicker in 9 will always work at high strength, with KFA13 providing a small correction.KFA13 providing a small correction.

QKEs are needed to “help” the kicker in 9 and QKEs are needed to “help” the kicker in 9 and provide extra kick to the beam deflected by SEH31.provide extra kick to the beam deflected by SEH31.

All this forces to go towards a nearly “carbon copy” All this forces to go towards a nearly “carbon copy” of the CT optics.of the CT optics.

Guidelines for new solution:Guidelines for new solution:Minimise the strength of QKEsMinimise the strength of QKEs

Close the combined SS16+SS31 slow bumpClose the combined SS16+SS31 slow bump

Close the fast bumpClose the fast bump


Hybrid MTE - IIHybrid MTE - II

Tests performed:Tests performed:Slow bump: combine bumps in SS16 and SS31Slow bump: combine bumps in SS16 and SS31


Original bump 31: not Original bump 31: not closed due to magnets closed due to magnets in seriesin seriesNew bump New bump

perfectly closed perfectly closed (also from (also from measurements)measurements)


Hybrid MTE - IIIHybrid MTE - III

Tests performed:Tests performed:Tune control during rise of slow bump and QKEsTune control during rise of slow bump and QKEs


Huge tune Huge tune variation. Difficult variation. Difficult to measure (too to measure (too fast for standard fast for standard tools).tools).

Partial correction using F8L. Partial correction using F8L. Potential issues:Potential issues:

Tune change in vertical plane. Tune change in vertical plane.

Correct response of the circuit.Correct response of the circuit.

Hybrid MTE - IIIHybrid MTE - III

Tests performed:Tests performed:

Kicked beam into islandKicked beam into islandFast tune change induces Fast tune change induces fast islands’ movement. fast islands’ movement. The beam kicked inside The beam kicked inside does not follow and does not follow and filamentsfilaments


No tune correctionNo tune correction

Best tune correctionBest tune correction

Accurate measurement Accurate measurement (special analysis tool) (special analysis tool) and correction of fast and correction of fast tune change are the top tune change are the top priority for 2012 tests. priority for 2012 tests.

Fluctuations - IFluctuations - I


Different strategy to measure PS reproducibility.Different strategy to measure PS reproducibility.

Instead of measuring trapping fluctuations, the position of Instead of measuring trapping fluctuations, the position of the islands is measured:the islands is measured:

Orbit system can be usedOrbit system can be used

Accurate measurement, easier to interpret, and it provides similar Accurate measurement, easier to interpret, and it provides similar information on reproducibility.information on reproducibility.

Measurement of tune vs. Dp/p Measurement of tune vs. Dp/p

Tune vs Tune vs p/pp/p

Small but systematic tune difference as a Small but systematic tune difference as a function of preceding magnetic cycle.function of preceding magnetic cycle.

Curve shape is also different. Curve shape is also different.

Courtesy A. LachaizeCourtesy A. Lachaize


Islands’ stabilityIslands’ stability


Island 1Island 1

Pickup 80Pickup 80 Average Average position (mm)position (mm)

Peak to peak Peak to peak (mm)(mm)

After ZERO cycle (POPS)After ZERO cycle (POPS) -15.34-15.34 1.891.89

After EASTB cycle (rotating After EASTB cycle (rotating machine)machine)

-13.64-13.64 2.712.71

After TOF cycle (rotating After TOF cycle (rotating machine)machine)

-20.75-20.75 0.970.97

After TOF cycle (POPS)After TOF cycle (POPS) -5.98-5.98 3.373.37

Flat-topFlat-top

Programmed Programmed tune ramptune ramp

Huge spread Huge spread for the same for the same preceding preceding cyclecycle

Huge dependence of Huge dependence of island’s position on island’s position on preceding magnetic cyclepreceding magnetic cycle

Reduced variation of island’s positionReduced variation of island’s position

Tests with special supercyclesTests with special supercycles1.1. 13 BPs with 1 MTE (and ZEROs)13 BPs with 1 MTE (and ZEROs)

2.2. 13 BPs with 2 consecutive MTE 13 BPs with 2 consecutive MTE

(and ZEROs )(and ZEROs )

3.3. 26 BPs with 2 MTE (and ZEROs).26 BPs with 2 MTE (and ZEROs).

This case is equivalent to two This case is equivalent to two supercycles of type 1.supercycles of type 1.

4.4. 26 BPs with 13 MTE26 BPs with 13 MTE


Statistics over five days - IStatistics over five days - I

Test reproducibility over long Test reproducibility over long periodperiod

Test with fixed preceding Test with fixed preceding magnetic cyclemagnetic cycle

Different ways to change the Different ways to change the tunetune

8/3/20128/3/2012 2020MG - IEFC Workshop 2012MG - IEFC Workshop 2012 Injectors schedule

In red measurement’s slotsIn red measurement’s slots

Huge tune variation requiring Huge tune variation requiring constant correction!constant correction!


Statistics over five days - IIStatistics over five days - II

October 25October 25thth (before injectors’ MD) (before injectors’ MD)


LHC as preceding cycle seems to improve stability.LHC as preceding cycle seems to improve stability.

Statistics over five days - IIIStatistics over five days - III

October 28October 28thth (after injectors’ MD) (after injectors’ MD)


LHC as preceding cycle does not seems to improve LHC as preceding cycle does not seems to improve stability. Stability seems already better than before MD.stability. Stability seems already better than before MD.

Highlights of Mini-Workshop on PS Highlights of Mini-Workshop on PS Main Magnet Field Issues - IMain Magnet Field Issues - I

Observations from the OP side – O. HansObservations from the OP side – O. Hans

Observations from the MTE side – A. LachaizeObservations from the MTE side – A. Lachaize

B-field regulation and PFW current regulation – F. BoattiniB-field regulation and PFW current regulation – F. Boattini

PS main magnet model and simulations – M. JuchnoPS main magnet model and simulations – M. Juchno

Past and recent main magnet measurements and B-train – M. BuzioPast and recent main magnet measurements and B-train – M. Buzio

Discussion to draw up an action planDiscussion to draw up an action plan8/3/20128/3/2012 2323MG - IEFC Workshop 2012MG - IEFC Workshop 2012

Highlights of Mini-Workshop on PS Highlights of Mini-Workshop on PS Main Magnet Field Issues - IIMain Magnet Field Issues - II

Highlights from the mini-Workshop:Highlights from the mini-Workshop:Magnetic model is mature for predictive use.Magnetic model is mature for predictive use.

Magnetic measurements (dipole and quadrupole Magnetic measurements (dipole and quadrupole components) are provide interesting data!components) are provide interesting data!

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Courtesy M. BuzioCourtesy M. Buzio

0.217

0.218

0.219

0.22

0.221

0.222

0.223

0.224

0.225

0.226

0 100 200 300 400 500 600

QH QH fit exp

B = 12650 GB = 12650 G

2010 measurement campaign by B. Vandorpe2010 measurement campaign by B. Vandorpe

Qualitative agreement!Qualitative agreement!

No decay of dipole componentNo decay of dipole component

Sizeable decay of quadrupolar Sizeable decay of quadrupolar componentcomponent

2424

Highlights of Mini-Workshop on PS Highlights of Mini-Workshop on PS Main Magnet Field Issues - IIIMain Magnet Field Issues - III

Wrap-up session last Tuesday to define actions.Wrap-up session last Tuesday to define actions.

Points relevant for MTE activities:Points relevant for MTE activities:System for measuring dipole and quadrupole components System for measuring dipole and quadrupole components will be available for measurements in two weeks.will be available for measurements in two weeks.

Higher-order (up to decapole) components could be Higher-order (up to decapole) components could be measured in a month.measured in a month.

Possible strategies for improving reproducibility (not Possible strategies for improving reproducibility (not necessarily operational…):necessarily operational…):

Use n (1<n<6) 26 GeV/c before the MTE cycle. Use n (1<n<6) 26 GeV/c before the MTE cycle.

Pre-cycle the main magnets at low current (up-down Pre-cycle the main magnets at low current (up-down between 0 A and 50 A) with several mini-cycles (should be between 0 A and 50 A) with several mini-cycles (should be fast).fast).


Milestones - IMilestones - I

Complete by Complete by mid-2012mid-2012 studies for dummy septum: studies for dummy septum:Paper studies: Paper studies:

Assessing principle Assessing principle Finalise the hardware designFinalise the hardware design

Beam studies: Beam studies: Set up new slow bump (no DHZ15) and new extraction trajectory Set up new slow bump (no DHZ15) and new extraction trajectory for TOF beam -> for TOF beam -> parallel MDparallel MD

Test new gamma-jump scheme (needs high-intensity beams Test new gamma-jump scheme (needs high-intensity beams operational) -> operational) -> dedicated MDdedicated MD

Perform by Perform by mid-2012mid-2012 tests with new magnetic tests with new magnetic measurement system (together with beam measurements):measurement system (together with beam measurements):

Reproducibility of quadrupolar component for Reproducibility of quadrupolar component for

operational and special super-cycles. operational and special super-cycles.

Effect of measures for magnetic reproducibility.Effect of measures for magnetic reproducibility.8/3/20128/3/2012 MG - IEFC Workshop 2012MG - IEFC Workshop 2012 2626

Parallel Parallel MDMD

Milestones - IIMilestones - II

Depending on the success of the mitigation measures (to Depending on the success of the mitigation measures (to be completed by be completed by end-2012end-2012):):

Resume trapping to confirm improved reproducibility -> Resume trapping to confirm improved reproducibility -> parallel MDparallel MD

Transfer to SPS to confirm improved reproducibility -> Transfer to SPS to confirm improved reproducibility -> parallel MDparallel MD

Complete by Complete by end-2012end-2012 studies for hybrid MTE: studies for hybrid MTE:Paper studies: Paper studies:

Assessing principle Assessing principle

Beam studies: Beam studies: Improve tools for tune correction during extraction.Improve tools for tune correction during extraction.

Tests of jumping the electrostatic septum (with CT settings) -> Tests of jumping the electrostatic septum (with CT settings) -> parallel MDparallel MD

Additional tests with special settings of CT elements -> Additional tests with special settings of CT elements -> dedicated dedicated MDMD


mte status and outlook for 2012

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