Integrating solenoid code & GUINEA-PIG slicing Yngve Inntjore Levinsen CERN 26. of April, 2012
Introduction Status of IR tracking code integration into PLACET (experimental solenoid inclusion) Study of the relevance of slicing in GUINEA-PIG 2 / 7
IR Tracking Overview Separate code by Barbara now rewritten to fit into PLACET. 3 / 7
IR Tracking Overview Separate code by Barbara now rewritten to fit into PLACET. Code has been checked and tracks correctly without solenoid active. Solenoid part still needs some debugging. New command(-s) in the TCL interface ready. 3 / 7
IR Tracking Overview Separate code by Barbara now rewritten to fit into PLACET. Code has been checked and tracks correctly without solenoid active. Solenoid part still needs some debugging. New command(-s) in the TCL interface ready. Simulation procedure kept similar to previous philosophy of Barbara. Development can be followed in cvs branch “irtracking”. 3 / 7
IR Tracking Example: ... TclCall -script {save_beam $name1} ... BeamlineUse -name test.ffs TestNoCorrection -beam beam1 -emitt_file emitt.dat ... BeamRead -file $name1 -beam beam2 BeamlineUse -name test.ffs.last TestIntRegion -beam beam2 -emitt_file emitt.dat -angle 0.007 -step 0.005 -synrad 1 -filename SiD+ antiDID_2005.txt 4 / 7
GUINEA-PIG slicing Noticed by accident when using one script with 20 slices and another with 100 slices giving different luminosity. 5 / 7
GUINEA-PIG slicing Noticed by accident when using one script with 20 slices and another with 100 slices giving different luminosity. Increase in number of slices -> lower peak luminosity higher total luminosity 5 / 7
GUINEA-PIG slicing Noticed by accident when using one script with 20 slices and another with 100 slices giving different luminosity. Increase in number of slices -> lower peak luminosity higher total luminosity Investigations so far points to a required number of slices of around 50-60. Usually, 20 slices have been used in simulations up until now (?) Results have not yet been confirmed, neither fully understood! 5 / 7
GUINEA-PIG slicing Noticed by accident when using one script with 20 slices and another with 100 slices giving different luminosity. Increase in number of slices -> lower peak luminosity higher total luminosity Investigations so far points to a required number of slices of around 50-60. Usually, 20 slices have been used in simulations up until now (?) Results have not yet been confirmed, neither fully understood! Results can be found in http://cern.ch/yngve/placet_testing ... 5 / 7
GUINEA-PIG slicing Increased cut_x,cut_y to 400/35. 600 000 particles in total (constant) -> more than 8000 particles per slice. 6.6 6.4 Total Luminosity [ 10 34 /cm 2 /s ] 6.2 6.0 5.8 5.6 5.4 5.2 0 10 20 30 40 50 60 70 80 Number of slices 6 / 7
GUINEA-PIG slicing Increased cut_x,cut_y to 400/35. 600 000 particles in total (constant) -> more than 8000 particles per slice. 2.35 2.30 Peak Luminosity [ 10 34 /cm 2 /s ] 2.25 2.20 2.15 2.10 2.05 2.00 1.95 0 10 20 30 40 50 60 70 80 Number of slices 6 / 7
GUINEA-PIG slicing Increased cut_x,cut_y to 400/35. 600 000 particles in total (constant) -> more than 8000 particles per slice. 2.35 2.30 Peak Luminosity [ 10 34 /cm 2 /s ] 2.25 2.20 2.15 2.1 2.10 => 5% 2.05 2.0 2.00 1.95 0 10 20 30 40 50 60 70 80 Number of slices 6 / 7
GUINEA-PIG slicing Increased cut_x,cut_y to 400/35. 600 000 particles in total (constant) -> more than 8000 particles per slice. 0.46 0.44 0.42 Peak / Total 0.40 0.38 0.36 0.34 0.32 0.30 0 10 20 30 40 50 60 70 80 Number of slices 6 / 7
GUINEA-PIG slicing Increased cut_x,cut_y to 400/35. 600 000 particles in total (constant) -> more than 8000 particles per slice. 250 200 Simulation time [s] 150 100 50 0 0 10 20 30 40 50 60 70 80 Number of slices 6 / 7
Summary IR Tracking code well on the way. Potential issue with GUINEA-PIG slicing observed, to be checked by experts (Daniel and/or Barbara, thanks in advance for helping!) 7 / 7
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