MTE roadmap – Beam physics aspects

MG - IEFC Workshop 22/03/2011MG - IEFC Workshop 22/03/2011 11

MTE roadmap – Beam physics MTE roadmap – Beam physics aspectsaspects

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

IntroductionIntroduction

Latest data analysisLatest data analysis

Mitigation measuresMitigation measures

Current activitiesCurrent activities

Situation of resourcesSituation of resources

Future plansFuture plans

AcknowledgementsAcknowledgements: G. Arduini, H. Bartosik, A. : G. Arduini, H. Bartosik, A. Lachaize, M. Newman, Y. Papaphilippou and many Lachaize, M. Newman, Y. Papaphilippou and many colleagues in BI, CO, OP, RF, DGS-RP, and TE-ABTcolleagues in BI, CO, OP, RF, DGS-RP, and TE-ABT

Introduction - IIntroduction - I

•MTE-related increase on septum 16

•Typical CT situation

MTE beam @ 2.2-2.3MTE beam @ 2.2-2.3××10101313 regularly delivered to the SPS for regularly delivered to the SPS for CNGS. CNGS.

Best trapping efficiencies up to 20% as required. PS Best trapping efficiencies up to 20% as required. PS Extraction efficiencies Extraction efficiencies ~ ~ 97-98% (97-98% (typical CT extraction typical CT extraction efficiencies efficiencies ~ ~ 93-94%93-94%))

Beam for CNGS physics delivered exclusively with MTE up to Beam for CNGS physics delivered exclusively with MTE up to about mid-May. Then some mixed operation until beginning about mid-May. Then some mixed operation until beginning of June.of June.Significant reduction of Significant reduction of PS ring irradiation w.r.t. PS ring irradiation w.r.t. CT.CT.

22MG - IEFC Workshop 22/03/2011MG - IEFC Workshop 22/03/2011MTE-related decrease in the PS ring

Introduction - IIIntroduction - II

SPS Transmission efficiency of MTE beam up to 94%, SPS Transmission efficiency of MTE beam up to 94%, practically as a CT beam in the SPS at the start of the practically as a CT beam in the SPS at the start of the run (CT has been optimised since years…).run (CT has been optimised since years…).

CNGS/MTE in May (old inj. optics)CNGS/MTE in May (old inj. optics) CNGS/CT in SeptemberCNGS/CT in September

33MG - IEFC Workshop 22/03/2011MG - IEFC Workshop 22/03/2011


Introduction - IIIIntroduction - III

The effects that blocked MTE operation in The effects that blocked MTE operation in 20102010

Activation of septum 16Activation of septum 16Generated 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 (already) and to Huge amount of beam data analysed (already) and to be analysed. Some new results reported in next be analysed. Some new results reported in next slides. slides.

Injection trajectories fluctuations in SPSInjection trajectories fluctuations in SPS


Latest analysis - ILatest analysis - I

Aim: quantitative comparison of MTE vs. CT Aim: quantitative comparison of MTE vs. CT in PS and SPS and correlation studies.in PS and SPS and correlation studies.Approach:Approach:

PSPSEvaluate extraction efficiency. This is obtained from Evaluate extraction efficiency. This is obtained from the BCT for circulating and several BCTs in the TT2 the BCT for circulating and several BCTs in the TT2 transfer line.transfer line.Evaluate trapping efficiency, i.e., the amount of Evaluate trapping efficiency, i.e., the amount of beam in each island normalised to the total intensity. beam in each island normalised to the total intensity. This is obtained from a number of BCTs in TT2 This is obtained from a number of BCTs in TT2 capable of measuring intensity vs. time over the five capable of measuring intensity vs. time over the five extracted turns.extracted turns.

SPSSPSEvaluate transmission between different times Evaluate transmission between different times in the cycle.in the cycle.


Latest analysis - IILatest analysis - II

Some comments: Some comments: The duty factor was suggested as figure-of-The duty factor was suggested as figure-of-merit to understand the beam performance. merit to understand the beam performance. An analytical estimate for the duty factor for An analytical estimate for the duty factor for an MTE-generated spill with an MTE-generated spill with trapping trapping efficiency xefficiency x is given by: is given by:

0

2

4

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836.001 836.003 836.005 836.007 836.009 836.011 836.013

Inte

nsity

(1010

)

Time (ms)

Single frequency (average over 16 data sets)

No excitation (1 data set)

Noise (average over 9 data sets)

T

T

dttI

dttI

T

0

2

2

0

)(

))((1

220815

1

xx Even if the CT beam is Even if the CT beam is generated differently with generated differently with respect to the MTE, a respect to the MTE, a trapping efficiency was trapping efficiency was defined as well.defined as well.Some plots will show the Some plots will show the time evolution of key beam time evolution of key beam dynamics quantities, dynamics quantities, others the correlation others the correlation between the beam between the beam dynamics quantities. dynamics quantities.


Issues with the cross-calibration of the TT2-TT10 BCTs.

Latest analysis - IIILatest analysis - III

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Ext

ract

ion

Eff

icie

ncy

[%

]

CNGS_September_1_30

2010

-09-

04 0

0:00

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2010

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05 0

7:34

:44

2010

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06 1

5:09

:28

2010

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2:44

:12

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6:18

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3:53

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1:28

:25

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5:03

:09

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14 1

2:37

:53

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15 2

0:12

:37

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3:47

:22

2010

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18 1

1:22

:06

2010

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19 1

8:56

:50

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21 0

2:31

:34

2010

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22 1

0:06

:18

2010

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23 1

7:41

:03

2010

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25 0

1:15

:47

2010

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26 0

8:50

:31

2010

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27 1

6:25

:15

2010

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29 0

0:00

:00

F16.BCT372:INTENSITYFTS.BCT379:INTENSITY212_Spill

Courtesy M. NewmanCourtesy M. Newman


Latest analysis - IVLatest analysis - IV

MTE beam

• No correlation between No correlation between extraction and trapping.extraction and trapping.

• Analytical formula describes Analytical formula describes well the duty factor.well the duty factor.

MTE beam

Perfect correlation between Perfect correlation between two consecutive extractions: two consecutive extractions: time-scale of fluctuations is time-scale of fluctuations is longer than one cyclelonger than one cycle. .



CT beam

MTE beam

Latest analysis - VLatest analysis - V

MTE: Bad MTE performance (huge MTE: Bad MTE performance (huge fluctuations in transmission at fluctuations in transmission at injection flat bottom) is badly injection flat bottom) is badly correlated with trapping (possibly correlated with trapping (possibly correlated with trajectory correlated with trajectory fluctuations?)fluctuations?) Courtesy M. NewmanCourtesy M. Newman


MTE beam

Latest analysis - VILatest analysis - VI

MTE beam

Some correlation between transmission in SPS and Some correlation between transmission in SPS and trapping/duty factor from flat bottom up to front porch. Then trapping/duty factor from flat bottom up to front porch. Then rather uncorrelated for MTE.rather uncorrelated for MTE.

Global transmission in SPS rather correlated with trapping: Global transmission in SPS rather correlated with trapping: mostly dominated by results at front porch.mostly dominated by results at front porch.



Latest analysis - VIILatest analysis - VII

MTE: large spread in MTE: large spread in transmission up to front transmission up to front porch. Then spread porch. Then spread comparable with CT.comparable with CT.



Mitigation measures: activation of Mitigation measures: activation of septum 16 - Iseptum 16 - I

•MAG16•MAG15

•new shielding

Courtesy S. Damjanovic

•new shielding

•SS15


Mitigation measures: activation of Mitigation measures: activation of septum 16 - IIseptum 16 - II

Dummy septumDummy septumIn principle, it provides a reduction acceptable for RP.In principle, it provides a reduction acceptable for RP.Improvement of the radiation released outside the tunnel Improvement of the radiation released outside the tunnel due to the corridor in front of the tunneldue to the corridor in front of the tunnelLinac3 radiation field to be revisedLinac3 radiation field to be revisedRelocation of DHZ15 and gamma-jump quadrupole to be Relocation of DHZ15 and gamma-jump quadrupole to be studied.studied.It can be installed only during It can be installed only during LS1LS1..

New extraction scheme using SEH31New extraction scheme using SEH31Re-use the electrostatic septum and the BFAs.Re-use the electrostatic septum and the BFAs.Principle: paper study in progress.Principle: paper study in progress.Hardware: HV cable connection improved to allow quick Hardware: HV cable connection improved to allow quick polarity change (about 1 hour tunnel intervention, only).polarity change (about 1 hour tunnel intervention, only).The CT elements remain untouched: always possible to The CT elements remain untouched: always possible to use the CT during the new extraction tests.use the CT during the new extraction tests.

Current status of new extraction Current status of new extraction teststests

First tests non-conclusive: losses indicates the First tests non-conclusive: losses indicates the beam jumps beyond the septum jumped.beam jumps beyond the septum jumped.

The kick of the septum is not visible on the The kick of the septum is not visible on the trajectory downstream of the septumtrajectory downstream of the septum

Kick imparted by KFA21+BFA21 is larger than 10 Kick imparted by KFA21+BFA21 is larger than 10 mm as required, but the beam is even largermm as required, but the beam is even larger

Tests to be repeated soon with a smaller beam Tests to be repeated soon with a smaller beam and after verification of CO measurements.and after verification of CO measurements.

Issues:Issues:

RF tree to be re-built after first week of test. RF tree to be re-built after first week of test. Corrupted by a non-clear reasonCorrupted by a non-clear reason

Doubt about the measured orbitDoubt about the measured orbitMG - collaboration meeting 10/03/2011MG - collaboration meeting 10/03/2011 1414


Fluctuations - IFluctuations - I

Some key tests to performSome key tests to performCorrelation with B-field fluctuations. This tests was Correlation with B-field fluctuations. This tests was already performed in 2010 and gave no correlation. already performed in 2010 and gave no correlation. However, during winter technical stop it turned out However, during winter technical stop it turned out that the ADC used for the measurement had a that the ADC used for the measurement had a Firmware issue!Firmware issue!

Perform trapping tests Perform trapping tests without POPS to without POPS to compare performance compare performance with last year.with last year.

First islands First islands of 2011of 2011

Tune Tune measurement measurement to be to be understood. understood.

Fluctuations - IIFluctuations - II

Capture Capture Capture set-up on 2 BP cycleCapture set-up on 2 BP cycle

Capture efficiency at 12-13 % without non-linear Capture efficiency at 12-13 % without non-linear coupling correctioncoupling correction

Issues:Issues:Setting-up delayed by difficulty in setting up a Setting-up delayed by difficulty in setting up a completely new cycle in INCA.completely new cycle in INCA.

Tune measurement not fully available due to noise Tune measurement not fully available due to noise (affects all the beams).(affects all the beams).

Not clear if the noise seen on the tune affects the Not clear if the noise seen on the tune affects the capture.capture.

MG - collaboration meeting 10/03/2011MG - collaboration meeting 10/03/2011 1616

Trajectory fluctuationsTrajectory fluctuations

Analysis of data taken Analysis of data taken last year in progress.last year in progress.

Study with beam the Study with beam the closure of the slow and closure of the slow and fast bumps (for the fast bumps (for the islands) started.islands) started.


Turn numberTurn number

PS circumferencePS circumference

Beam kicked into Beam kicked into islandisland

Situation of resourcesSituation of resources

Beam dynamics studies: Beam dynamics studies: extremely small group of people (recently new people joined extremely small group of people (recently new people joined the team). Barely sufficient for this year, probably insufficient the team). Barely sufficient for this year, probably insufficient by the end of the year. by the end of the year.

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.

Instrumentation and controls: we normally stress the Instrumentation and controls: we normally stress the systems and act as guinea pig. We need support beyond systems and act as guinea pig. We need support beyond what is needed for standard operation.what is needed for standard operation.

SPS activities: SPS activities: we depend critically on OP for pushing the setting up and the we depend critically on OP for pushing the setting up and the studies at the SPS (studies at the SPS (main conclusions of the MTE Workshop main conclusions of the MTE Workshop in September 2010in September 2010))



Schedule: studies in 2011Schedule: studies in 2011

Initially mainly focus on the PS toInitially mainly focus on the PS toPursue studies for new extraction schemePursue studies for new extraction schemeTests closure of slow bump and stability of Tests closure of slow bump and stability of extraction conditions.extraction conditions.Additional tests on trapping (correlation with energy Additional tests on trapping (correlation with energy fluctuations, POPS, etc.)fluctuations, POPS, etc.)

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


Future: some scenariosFuture: some scenarios

The new scheme with SEH31 worksThe new scheme with SEH31 worksWe could aim at putting in operation MTE (after the We could aim at putting in operation MTE (after the list of additional studies to be performed).list of additional studies to be performed).Would the dummy septum still be needed?Would the dummy septum still be needed?Analysis of how to proceed with CT elements to be Analysis of how to proceed with CT elements to be recuperated for MTE (SEH31, BFAs). recuperated for MTE (SEH31, BFAs). Answer to the previous two points would provide Answer to the previous two points would provide input for the activities for LS1.input for the activities for LS1.

The new scheme with SEH31 does not workThe new scheme with SEH31 does not workWe could aim at delivering at most a couple of We could aim at delivering at most a couple of cycles to SPS with MTE before LS1.cycles to SPS with MTE before LS1.Activities during LS1 would be linked to installation Activities during LS1 would be linked to installation of dummy septum, always keeping CT alive for the of dummy septum, always keeping CT alive for the start-up after LS1.start-up after LS1.

MTE roadmap – Beam physics aspects

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