MTE Conclusions for 2011

MTE Conclusions for 2011MTE Conclusions for 2011

S. Gilardoni, M. Giovannozzi, C. S. Gilardoni, M. Giovannozzi, C. Hernalsteens, A. Lachaize, B. VandorpeHernalsteens, A. Lachaize, B. Vandorpe

Dummy septum studiesDummy septum studies

Hybrid MTEHybrid MTE

Observation of islands at 2 GeVObservation of islands at 2 GeV

Observations of field stabilityObservations of field stability

AcknowledgementsAcknowledgements: M. Buzio, OP-PS crew, R. : M. Buzio, OP-PS crew, R. SteerenbergSteerenberg

13/01/201213/01/2012 11MG - IEFC meetingMG - IEFC meeting

Milestones (from IEFC 21/10/11)Milestones (from IEFC 21/10/11)

End of 2011End of 2011Studies and measurements to confirm feasibility of dummy septum solution Studies and measurements to confirm feasibility of dummy septum solution (ABP/OP/TE-ABT).(ABP/OP/TE-ABT).

Studies almost complete.Studies almost complete.

Measurements: time lost for failure of SMH42. Encouraging results obtained Measurements: time lost for failure of SMH42. Encouraging results obtained with ions. Completions of measurements in March/April (agreed with ABT with ions. Completions of measurements in March/April (agreed with ABT experts).experts).

Prototype magnetic measurements of high-order multipoles of PS main Prototype magnetic measurements of high-order multipoles of PS main magnets (ABP/TE-MSC).magnets (ABP/TE-MSC).

Hardware ready.Hardware ready.

No possibility to find suitable time slot during POPS test at end of 2011. No possibility to find suitable time slot during POPS test at end of 2011. Re-Re-scheduled during hardware tests period in 2012.scheduled during hardware tests period in 2012.

Preliminary beam tests of hybrid MTE (ABP/OP): Preliminary beam tests of hybrid MTE (ABP/OP): DoneDone

Additional work done: Additional work done: Observation of islands at 2 GeVObservation of islands at 2 GeV

Observation of field stabilityObservation of field stability


Milestones (from IEFC 21/10/11)Milestones (from IEFC 21/10/11)

Q1 2012: Q1 2012: Finalisation of studies of hybrid MTE (ABP)Finalisation of studies of hybrid MTE (ABP)

Q2 2012: Q2 2012: Finalisation beam studies of hybrid MTEFinalisation beam studies of hybrid MTE

Conclusions from fluctuations studies (hopefully)Conclusions from fluctuations studies (hopefully)

NB: to continue the tests even after the failure of NB: to continue the tests even after the failure of SMH42, ions were used. Several users were set-up SMH42, ions were used. Several users were set-up with ions (e.g., a clone of TOF) thanks to the efforts with ions (e.g., a clone of TOF) thanks to the efforts

of the OP-PS crew.of the OP-PS crew.


Dummy septum studies - IDummy septum 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)


Isl. Slow bump

Nominal TOF

Modified fast bump

Dummy septum studies - IIDummy septum 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


Dummy septum studies - IIIDummy septum studies - III



With KFA4With KFA4

SS15SS15

• 3.6 mm gain

• RMS: 0.5 mm (KFA71) and 1.5 mm (KFA71 and 04)

Dummy septum studies - IVDummy septum 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

Hybrid MTE - IHybrid MTE - I

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 - IIHybrid MTE - II

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 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.

Observation of islands at 2 GeV - IObservation of islands at 2 GeV - I

Proposed to probe trapping reproducibility for very Proposed to probe trapping reproducibility for very different conditions with respect to nominal (below different conditions with respect to nominal (below transition).transition).

Found islands in V-plane!Found islands in V-plane!

Linear coupling is responsible for this unexpected Linear coupling is responsible for this unexpected behaviour.behaviour.


H-planeH-plane V-planeV-plane

Observation of islands at 2 GeV - IIObservation of islands at 2 GeV - II

Campaign of coupling measurement launched.Campaign of coupling measurement launched.

Different energies probed from ions injection to 14 GeV. Different energies probed from ions injection to 14 GeV.

Data analysis is in progress.Data analysis is in progress.

NB: coupling at injection is used to control instabilities NB: coupling at injection is used to control instabilities for LHC beam. for LHC beam.


2 GeV2 GeV

PreliminaryPreliminary

Observations of field stability - IObservations of field stability - I

These measurements are a complement of These measurements are a complement of measurement of islands’ position vs. time.measurement of islands’ position vs. time.

They provide additional insight of B-field They provide additional insight of B-field components stability.components stability.

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QH QH fit exp

B = 12650 GB = 12650 G

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Series1 QH fit exp

B = 7000 GB = 7000 G

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

Observations of field stability - IIObservations of field stability - II


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WFNI Basic WFNP Basic WFW Basic

WFNI Fast WFNP Fast WFW Fast

2011 measurement 2011 measurement campaign by B. campaign by B.

VandorpeVandorpe

B = 6666 GB = 6666 G B = 6666 GB = 6666 G

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Qh Fast = f(MRP) C1000C1050C1100C1200C1300C1400C1500C1600C1700

Observations of field stability - IIIObservations of field stability - III

Direct magnetic measurements will provide more Direct magnetic measurements will provide more insight in the behaviour of the PS main magnets insight in the behaviour of the PS main magnets (planned for hardware test period).(planned for hardware test period).

Large amount of data available for analysis and Large amount of data available for analysis and discussion with various experts: it would be discussion with various experts: it would be worthwhile organising a half-day discussion (as worthwhile organising a half-day discussion (as proposed by R. Steerenberg) in January/February.proposed by R. Steerenberg) in January/February.


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MTE Conclusions for 2011