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XL4 low magnetic field coupler

XL4 low magnetic field coupler. V. Dolgashev 21 April 04. Field distribution in XL4 output structure. Surface electric field distribution in 1/4 th of the structure, max. field in the coupler cell 65 MV/m, output power 50 MW, average gradient in coupler cell < 20 MV/m.

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XL4 low magnetic field coupler

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  1. XL4 low magnetic field coupler V. Dolgashev 21 April 04

  2. Field distribution in XL4 output structure Surface electric field distribution in 1/4th of the structure, max. field in the coupler cell 65 MV/m, output power 50 MW, average gradient in coupler cell < 20 MV/m Surface magnetic field distribution, field on the flat part of the coupler iris ~0.28MA/m (estimated max. field 0.7 MA/m for 80 um radius) H [A/m] s [mm] Max. temperature on surface for output power of 50 MW and different pulse width vs. time, for 50 MW and 1.5 us temperature rise is 260 deg. C. Mesh Surface magnetic field V.A.Dolgashev, C. Pearson, 25 March 04.

  3. Field distribution in XL4 output structure Surface magnetic field distribution in 1/4th of the structure, max. field in the coupler output power 50 MW Surface magnetic field distribution, field on the flat part of the coupler iris ~0.28MA/m (estimated max. field 0.7 MA/m for 80 um radius) Surface electric field distribution, field on the flat part of the coupler iris ~0.23MV/m (estimated max. field 0.6 MV/m for 80 um radius) Surface electric field distribution in 1/4th of the structure, max. field in the coupler cell 65 MV/m, output power 50 MW, average gradient in coupler cell < 20MV/m V.A.Dolgashev, C. Pearson, 25 March 04.

  4. Field distribution in XL4 output structure Surface electric field distribution in 1/4th of the structure, max. field in the coupler cell 65 MV/m, output power 50 MW, average gradient in coupler cell < 20 MV/m Surface magnetic field distribution, max. field 0.21 MA/m. H [A/m] s [mm] Max. temperature on surface for output power of 50 MW and different pulse width vs. time, for 50 MW and 1.5 us temperature rise is 23 deg. C. Mesh Surface magnetic field V.A.Dolgashev, 31 March 04.

  5. Field distribution in XL4 output structure, symmetrized fields Surface electric field distribution in 1/4th of the structure, max. field in the coupler cell 69 MV/m, output power 50 MW, average gradient in coupler cell < 20 MV/m Surface magnetic field distribution, maximum field on the coupler iris ~0.23MA/m H [A/m] s [mm] Mesh Surface magnetic field V.A.Dolgashev, 20 April 04.

  6. Field distribution in XL4 output structure, symmetrized fields Surface electric fields V.A.Dolgashev, 21 April 04.

  7. Fields on coupler irises for 50 MW output Rounded iris, Max. field ~65 MV/m Initial distribution, sharp edged coupler Max. field ~65 MV/m Rounded iris, with symmetrized fields Max. field ~69 MV/m

  8. First iteration of the coupler dimensions No losses 160227 tetrahedra Mesh PML layer test

  9. 23rd iteration !2a 2b t D rr rz !************run parameters******************* _nra: 17 _r_step__i_step: 0.006 0.025 _SearchNotScan(Y/N): Y _Number_of_search_iterations: 4 _WhatToChange(1-b_cpl_w;2-b_cpl_b_1;3-b_cpl_b_2): 1 !******************coupler****************** #d: 2.9464 #b: 10.84006564 #iris_w: 12.594 #iris_r: 0 #a_beam_pipe: 7.2009 #ra_beam_pipe: 0.9398 #l_beam_pipe: 8 #w_wgd: 22.86 #r_wgd: 2. #l_wgd: 8 #iris_th: 4 #race_r: -1 #race_dr: -1 #n_phi: 21 !2a 2b t D rr rz ! regular structure 14.40180 26.4922 1.8796 4.85140 -1.00000 -1.00000 13.80998 25.67432 1.8796 4.8514 -1.00000 -1.00000 11.99896 23.6982 2.1336 5.35686 -1.00000 -1.00000 9.525 10.79500 4.00000 3.00000 1.905 1.905 #define REC_ROUNDING_KLY 0.16 #define REC_X_KLY 1.187 //#define REC_X_KLY 1.3 //#define REC_X_KLY 1.0390 #define REC_Y_KLY_WG 0.601 //#define REC_Y_KLY_WG 0.58

  10. Evaluation of matching of the output cavity using Norman’s method High magnetic field coupler Low magnetic field coupler

  11. Evaluation of matching of the output cavity using Kroll’s method High magnetic field coupler Low magnetic field coupler with racetrack

  12. Dimensions for XL4 low magnetic field coupler, I show only dimensions that different from original design R2mm R2mm 12.515mm/2 4mm 16.2585mm/2 V.A. Dolgashev, 30 March 2004

  13. Dimensions for XL4 low magnetic field coupler with symmetrized fields, I show only dimensions that different from original design 1.1923in/2 R2mm R2mm 4mm 0.6037 in/2 12.546mm/2 V.A. Dolgashev, 20 April 2004

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