Outcome from 2011 Chamonix workshop New structure of the SPSU Study Group E. Shaposhnikova 17.02.2011 17/02/20111SPSU meeting.

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Presentation transcript:

Outcome from 2011 Chamonix workshop New structure of the SPSU Study Group E. Shaposhnikova /02/20111SPSU meeting

New structure of the SPSU SG SPS Upgrade is a part of the LIU project (leader - R. Garoby, deputy - M. Meddahi) SPS Upgrade coordination - B. Goddard (deputy - E.S., scientific secretary - G. Rumolo ) – more information at the next SG meeting Mitigation of e-cloud (coatings and electrodes) will be studied by separate WG chaired by M. Jimenez (TE/VAC) SPSU SG will be responsible for all Beam Dynamics studies (calculations, simulations, measurements, data analysis) related to the SPS upgrade: SPSU SG → SPSU-BD SG scientific secretary – B. Salvant convener – E. S. new web site? 17/02/20112SPSU meeting

Is it a good name? Google tells… SPSU: Worst Schools Reviewed - Home - [ Diese Seite übersetzen ] Find out why one should avoid SPSU and choose an alternative for higher education… -Diese Seite übersetzen 17/02/20113SPSU meeting

And what about BD? (Beam Dynamics or Bande Dessinee?) 17/02/20114SPSU meeting

Proposed membership for SPSU-BD SG G. Arduini (optics, LHC) T. Argyropoulos (double RF) H. Bartosik (low γ t ) T. Bohl (RF, MDs) F. Caspers (impedance) K. Cornelis (OP, MDs) W. Hofle (FB, MDs) E. Metral (impedance) J. Muller (MDs, long. HOM) Y. Papaphilippou (optics, low γ t ) G. Rumolo (e-cloud) M. Taborelli (e-cloud) B. Salvant (MDs, impedance) E. Shaposhnikova (convenor) plus C. Bhat (LARP) N. Monet (multi-bunch) H. Maury Cuna (e-cloud) N. Biancacci (impedance) 17/02/20115SPSU meeting

LHC beams in SPS Beam parameters 450 GeV/c (intensity maximum injected minus losses) nom bunch spacingns indiv max bunch intensity number of bunches4x724x364x243x724x36 1 total intensity on FT long. emittanceeVs norm. h/v emittanceμmμm * ~10? * double batch injection in PS: 1.1/1.4 17/02/2011SPSU meeting

LHC Performance Estimates 7Chamonix, January 2011 Oliver Brüning BE-ABP Parameternominal 25ns50ns N1.15E+111.2E+111.7E+11 nbnb beam current [A] x-ing angle [  rad] beam separation [  ] 10  * [m]  n [  m]  L [eVs] energy spread1.00E-04 bunch length [m]7.50E-02 IBS horizontal [h]80 -> IBS longitudinal [h]61 -> Piwinski parameter geom. reduction beam-beam / IP3.10E-033.1E-034.4E-036.6E-03 Peak Luminosity nominal emittancesmall emittance Performance reach for existing 7 TeV: Radiation damping: hor: 26h ver: 13h

LHC Performance Estimates 8Chamonix, January 2011 Oliver Brüning BE-ABP Parameternominal 25ns50ns 25ns 50ns N1.15E+112.0E+113.3E+112.0E E+11 nbnb beam current [A] x-ing angle [  rad] beam separation [  ] 10  * [m]  n [  m]  L [eVs] energy spread1.00E-04 bunch length [m]7.50E-02 IBS horizontal [h]80 -> IBS longitudinal [h]61 -> 6021 Piwinski parameter geom. reduction beam-beam / IP3.10E-034.5E-034.9E-037.7E-38.6E-3 Peak Luminosity small  *‘large’  * Performance reach for LINAC4 + LIU + HL triplet:

intensity & emittance from injectors spacing [ns] bunch intensity [10 11 ] transv. rms norm. emittance [  m] nominal available “now” available “now” available “now” w LINAC w LINAC w LINAC4+LIU w LINAC4+LIU talk by O. Bruning could we get 20% more? HL-LHC class F. Zimmerman:

High priority studies in 2011 ultimate intensities at 50 ns and 25 ns bunch spacings losses: statistics → J. Muller, optimisation - everybody e-cloud with intensity and injected trans. emittance → G. Rumolo beam parameters at extraction: – long. → J. Muller, – trans. → K. Cornelis (tbc) transverse emittance blow-up (nominal optics) origin for single bunch (simulations and meas.) → B. Salvant multi-bunch at different spacings → C. Bhat (leaving…) low gamma transition optics optics optimisation during nominal LHC cycle (21.6 s) → Y. Papaphilippou long. stability, voltage program and required long. controlled emittance blow-up for coupled-bunch instabilities → E. S. space charge limit (single bunch measurements) → H. Bartosik effect on e-cloud instabilities → G. Rumolo 17/02/201110SPSU meeting

High priority studies in 2011 – cont. Long. beam stability in a double RF system – single bunch stability → T. Argyropoulos – optimum phase offset during cycle → T.A. Impedance identification: – transverse → E. Metral/B. Salvant/N. Biancacci – longitudinal HOM → J. Muller + N. Monet Beam loading in the 200 MHz RF system: – limitations, optimum voltage partition → T. Bohl Low harmonic RF system in the SPS for PS-SPS transfer optimisation → E.S. … 17/02/201111SPSU meeting

Nominal intensity now VoltagePower 17/02/2011SPSU meeting12

Ultimate intensity (based on 2010 experience with 25 ns beam) VoltagePower 17/02/2011SPSU meeting13

Power/cavity in 4- & 5- section cavities with P 4 =P 5 (but V 4 ≠ V 5 ) nominal intensity & 0.5 eVsultimate intensity & 0.6 eVs 17/02/2011SPSU meeting14