45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York ECLOUD News 1) Bug in SEY model fixed 2) List of present activities.

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Presentation transcript:

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York ECLOUD News 1) Bug in SEY model fixed 2) List of present activities Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education Electron Cloud Simulations Meeting 8 July 2009

ECLOUD News / J.A.Crittenden 2/6 CTA09 Talk Slide 11: ECLOUD Secondary Yield Distribution for TiN The SEY curve for TiN results in a low yield region being populated by the resonant energy enhancement. Off resonanceOn resonance Why is d max = 0.5 rather than the input file value of 0.95 ??

8 July 2009 ECLOUD News / J.A.Crittenden 3/6 ECLOUD Routine Seiler The bug affects only the results using the SEY elastic option 3 (CTA09). if (inel.eq.1.or.inel.eq.2) then enem=yemax if(enem.le.300) then qtelast = frac1(enem)/(1-frac1(enem)) else qtelast = frac2(enem)/(1-frac2(enem)) endif if (inel.eq.2) then ene0=0.1d0 qtene0 = yield(ene0,costheta0,yim,yemax) qtelast = dexp(-enem/4.d0)*(1.-qtene0* & frac1(ene0)/(1-frac1(ene0)))+qtelast endif else if (inel.eq.3) then qtelast = ((sqrt(enem)-sqrt(enem+150))**2/(sqrt(enem)+ & sqrt(enem+150))**2) endif c c rescale delta_max only for inel=2,3, not for inel=1, c to be consistent with Noel's fitting c if (inel.eq.2.or.inel.eq.3) then yim=yim*yim/(yim+qtelast) endif Variable enem not initialized for inel = 3, but used to rescale d max Consequence: d max indeterminate

8 July 2009 ECLOUD News / J.A.Crittenden 4/6 Kanazawa suggestion: Scan d max and Epeak (after bug fix) ECLOUD can produce resonant suppression, but only for lower d max than we expect for TiN  peak = 0.8 E peak = 500 eV

8 July 2009 ECLOUD News / J.A.Crittenden 5/6 List of ECLOUD Activities 1. Repeat modelling of CesrTA chicane data (Improve input parameters with local lattice info) 2. Collaboration with Mauro Pivi on comparing POSINST and ECLOUD results for both CesrTA and PEP-II data 3. Develop predictions for electron beam data in the chicane (Eric Wilkinson)

8 July 2009 ECLOUD News / J.A.Crittenden 6/6 Modelling Electron Beam in Chicane Caveat: ECLOUD bug still here. d max was rescaled from 2.0 to 1.3.  peak = 1.3 E peak = 310 eV ECLOUD can find resonant maxima and minima in the same chicane scan