Friday meeting Nawin Juntong Halloween-2008

σ z = 1 mmσ z = 0.7 mmσ z = 0.3 mm ECHO 2D ABCI Δ (%) ECHO 2D ABCIΔ (%) ECHO 2D ABCI Δ (%) TESLA k L [V/pC] k T [V/pC/m] ICHIRO k L [V/pC] k T [V/pC/m] RE- ENTRANT k L [V/pC] k T [V/pC/m] ECHO 2D and ABCI comparison TESLA – CDR (σ z = 0.7mm) Longitudinal loss factor (k L )10.2 V/pC Transverse loss factor (k T )15.1 V/pC/m TTF – DR (σ z = 1mm) HOM loss factor (k L )9.24 V/pC Values from papers for TESLA structure ICHIRO RE-ENTRANT TESLA ECHO 2D mesh= σ z /5, ABCI mesh= σ z /10,

TTF-Style Coupler Mesh (cells) G.BurtG.Burt modifiedG.HoffstaetterG.Hoffstaetter use scale B i i i i i i i i i i i i i Infinite i i i 9 cells run Mesh (cells) G.BurtG.Burt modifiedG.HoffstaetterG.Hoffstaetter use scale B i i i i i i i i i i i i i i i i Infinite i i i 4.5 cells run Non identical cells

RF Coupler kick comparison kxUpstreamDownstreamOnly Power CP My results i I. Zagorodnov i i-- V.Yakovlev i i i M. Dohlus i-23+52i i 2 N. Solyak i i-- UpstreamDownstream 1 ILC Workshop, DESY, May Wakefest07,RF coupler kick. 3 MOPP013, EPAC08. 4 MOPP042, EPAC08.

k x is constant when vary the phase Φ k

HOM included simulation -Extract HOM geometry from Slava’s sat file in HFSS into new separated sat file for each part. -Import new sat files into MWS. -Tested simulation run with 20 lines/wavelength meshing in eigenmode solution. TDR (Z. NAWIN (MWS drawing by N. Juntong)

NEXT Obtain the rf-kick results from the simulation on fundamental mode and HOM couplers with MWS. Attend CAS2008 at Frascati, Italy on 2-14 November 2008.

BACK UP Slides

1.Combine 2 SW fields to get TW fields 2.Integrate Lorentz force to get the change of momentum 3.Transverse kick factor is a ratio of the change of transverse momentum to the change of longitudinal momentum How to calculate kick factor (Dr. G.Burt method) PEC bc. PMC bc.

1.Combine 2 SW fields to get TW fields 2.Integrate Lorentz force to get the change of momentum 3.Transverse kick factor is a ratio of the change of transverse momentum to the change of longitudinal momentum How to calculate kick factor (B. Buckley and G.H. Hoffstaetter method) MWS from fields theis ˆ A PRST-AB 10,111002(2007),Cornell-ERL-06-02

TESLA-TTF beam pipe cavity TESLA TESLA – CDR (σ z = 0.7mm) Longitudinal loss factor (k L )10.2 V/pC Transverse loss factor (k T )15.1 V/pC/m TTF – DR (σ z = 1mm) HOM loss factor (k L )9.24 V/pC Parameters σ z = 1 mmσ z = 0.7 mmσ z = 0.3 mm ECHO 2DABCIECHO 2DABCIECHO 2DABCI Longitudinal loss factor (k L ) [V/pC] Transverse loss factor (k T ) [V/pC/m]