Global analysis of MTE and CT beams in PS and SPS

MG - collaboration meeting 10/03/2011MG - collaboration meeting 10/03/2011 11

Global analysis of MTE and CT Global analysis of MTE and CT beams in PS and SPSbeams in PS and SPS

S. Gilardoni, M. Giovannozzi, M. NewmanS. Gilardoni, M. Giovannozzi, M. Newman

InroductionInroduction

Analysis of PS performance in 2010 for MTE and CTAnalysis of PS performance in 2010 for MTE and CT

Analysis of SPS performance in 2010 for MTE and CTAnalysis of SPS performance in 2010 for MTE and CT

Programme of the coming daysProgramme of the coming days


Introduction - IIntroduction - 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.


Introduction - IIIntroduction - II

Some comments: Some comments: The SPS RF experts suggested to use The SPS RF experts suggested to use also the duty factor as figure-of-merit to also the duty factor as figure-of-merit to understand the beam performance. It is understand the beam performance. It is defined as:defined as:

An analytical estimate for the duty factor An analytical estimate for the duty factor for an MTE-generated spill with trapping for an MTE-generated spill with trapping efficiency x is given by:efficiency x is given by:

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836.001 836.003 836.005 836.007 836.009 836.011 836.013

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T

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dttI

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Introduction - IIIIntroduction - III

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

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F16.BCT372:INTENSITYFTS.BCT379:INTENSITY212_Spill

66MG - collaboration meeting 10/03/2011MG - collaboration meeting 10/03/2011

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

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Average Extraction Efficiency, =98.23, =1.81Average Trapping Efficiency, =19.08, =1.36

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CT beam CT beam

MTE beam MTE beam

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CT beam CT beam

MTE beam

MTE beam


CT beam CT beam

MTE beam MTE beam


CT beam CT beam

MTE beam MTE beam


CT beam CT beam

MTE beam

MTE beam

1414MG - collaboration meeting 10/03/2011MG - collaboration meeting 10/03/2011 MTE beam


CT beam CT beam

MTE beam

MTE beam


CT beam CT beam

MTE beam MTE beam

1717MG - collaboration meeting 10/03/2011MG - collaboration meeting 10/03/2011 MTE beam


CT beam CT beam

MTE beam MTE beam

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Transmission Bin [%]

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SPS Transmissions: ALL Data

Transmission 1: END_FB / AFT_INJ2 [%]Transmission 2: FR_PORCH / END_FB [%]Transmission 3: TRANS / FR_PORCH [%]Transmission 4: RAMP / TRANS [%]Transmission 5: START_FT / RAMP [%]Total: START_FT / AFT_INJ2 [%]


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CT beamCT beam

MTE beam MTE beam


CT beam

MTE beam

Some conclusions - ISome conclusions - I

Better correlation between two extractions for MTE (both Better correlation between two extractions for MTE (both trapping and duty factor). This is due to the relationship trapping and duty factor). This is due to the relationship between trapping and duty cycle for MTE.between trapping and duty cycle for MTE.

Second extraction always better than first one (trapping) Second extraction always better than first one (trapping) for CT. It is a possible consequence of BFA PPM for CT. It is a possible consequence of BFA PPM capabilities – suggested by capabilities – suggested by YannisYannis).).

Not so good correlation for duty factor of two extraction Not so good correlation for duty factor of two extraction for CT. This implies that the shape of the spill can change for CT. This implies that the shape of the spill can change between two extractions (BFA PPM capabilities?).between two extractions (BFA PPM capabilities?).

This means that the trapping fluctuations are on a longer This means that the trapping fluctuations are on a longer time scale than two consecutive cycles. time scale than two consecutive cycles.


Some conclusions - IISome conclusions - II

Bad MTE performance (huge fluctuations in injection flat Bad MTE performance (huge fluctuations in injection flat bottom). Badly correlated with trapping (possibly bottom). Badly correlated with trapping (possibly correlated with trajectory fluctuations?)correlated with trajectory fluctuations?)

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

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



Programme of the coming days - IProgramme of the coming days - I

Antoine:Antoine:Cross-check, verification, and generalisation of the code Cross-check, verification, and generalisation of the code written by A. Franchi for the steering with DFAs in TT2. Test written by A. Franchi for the steering with DFAs in TT2. Test in the CCC tomorrow.in the CCC tomorrow.Help with analysis of trajectory stability taken last yearHelp with analysis of trajectory stability taken last yearClean up and generalisation of codes developed by E. Clean up and generalisation of codes developed by E. Benedetto.Benedetto.

Massimo: Massimo: Transfer information from E. Benedetto on the tool to analyse Transfer information from E. Benedetto on the tool to analyse the measurements in TT2-TT10-SPS (optics, dispersion, and the measurements in TT2-TT10-SPS (optics, dispersion, and trajectory stability). Analysis of trajectories data taken last trajectory stability). Analysis of trajectories data taken last year.year.

Antoine+Massimo:Antoine+Massimo:Simulations of closure of the slow bump for MTE.Simulations of closure of the slow bump for MTE.


Programme of the coming days - IProgramme of the coming days - I

Simone:Simone:Continue study of SEH31 jumpingContinue study of SEH31 jumpingStudy closure of MTE slow bumpStudy closure of MTE slow bump

Myriam:Myriam:Complete MTE/CT comparison studiesComplete MTE/CT comparison studiesComplete analysis of data taken with one missing PSB ring Complete analysis of data taken with one missing PSB ring (simulating barrier bucket)(simulating barrier bucket)Complete analysis of stability test of tuning quadrupoles in Complete analysis of stability test of tuning quadrupoles in the PSthe PS

Documents

Global analysis of MTE and CT beams in PS and SPS