Ecloud Simulation Meeting Ecloud Heat Load simulations for

E-cloud Simulation Meeting Ecloud Heat Load simulations for the LHC arcs Humberto Maury Cuna June 16 th, 2011

Simulation parameters for 50 ns Bunch spacing Bunch intensity 50 ns 1. 2 x 1011 p/b Bunch length 9 cm sx, sy SEY Reflectivity 1. 6 2. 4 0. 2 0. 9 Fill pattern Energy 1 Magnetic Pressure field 0. 3 mm 4. 195 T --- 3. 5 Te. V* Energy 3. 5 Te. V * We used a primary photoelectron emission yield =0. 0001233 (1) 36 bunches nistep = 2500 200 ns 36 bunches 1. 1 µs Fill 1704 (13/4/2011 – 12: 16 to 16: 47) X 3

Multipacting 3. 5 Te. V

�Interspace: Times the space charge field is recalculated. (10 30, 100). �Nbstep: Number of intermediate steps per bunch passage. (150 450). �Nistep: Number of intermediate steps per inter bunch drift. (2500 5000). �Npepb: Number of macroparticles/bunch. (500 2000).

Simulation parameters for 50 ns – Drift Bunch spacing 50 ns Bunch intensity 1. 15 x 1011 p/b Bunch length 9 cm sx, sy 0. 3 mm SEY Reflectivity 1. 7 2. 3 0. 3 Fill pattern Energy 1 Magnetic Radius field (mm) 4. 195 T 15 - 50 3. 5 Te. V* Energy 3. 5 Te. V * We used a primary photoelectron emission yield =0. 0001233 36 bunches (1) nistep = 2500 200 ns 36 bunches

Simulations with and without sawtooth pattern 3. 5 Te. V

Simulation parameters sawtooth pattern simulations Bunch spacing 25 ns Bunch intensity 1. 15 x 1011 p/b SEY Reflectivity 1. 2 1. 5 0. 5 Primary photoelectron emission yield Energy 0. 000123 3 3. 5 Te. V 7 Te. V 0. 001233 Bunch length sx, sy 9 cm Magnetic field Primary photoelectron emission yield (w/o pattern) Energy 4. 195 T 0. 0002466 3. 5 Te. V 8. 39 T 0. 002466 7 Te. V 0. 3 mm 7. 55 cm 72 bunches nistep = 2500 200 ns 72 bunches

Simulations with and without sawtooth pattern 7 Te. V

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