1. Isabell-A. Melzer-Pellmann ILC-tech meeting, 24.8.2006 Status report of offset and angle studies with Guinea-Pig Status report of offset and angle studies with Guinea-Pig Isabell-Alissandra Melzer-Pellmann ILC tech meeting July 11 th, 2006

2. Isabell-A. Melzer-Pellmann ILC-tech meeting, 24.8.2006 2 Offset and angle scan from TESLA TDR Luminosity drops fast with small change of offset and/or angle TESLA parameters:  y = 5nm,  y = 12  rad How is the luminosity change for the ILC parameters? Results from beam-beam simulation with GUINEA-PIG from TESLA TDR

3. Isabell-A. Melzer-Pellmann ILC-tech meeting, 24.8.2006 3 Offset scan with ILC parameters ILC parameters: ILC 500 NOM:  y = 5.7nm ILC 500 LOW Q:  y = 3.5nm ILC 500 LARGE Y:  y = 8.1nm ILC 500 LOW P:  y = 3.8nm ILC 500 HIGH L:  y = 3.5nm ILC 1000 NOM:  y = 3.5nm ILC 1000 LOW Q:  y = 2.5nm ILC 1000 LARGE Y:  y = 7.0nm ILC 1000 LOW P:  y = 2.7nm ILC 1000 HIGH L:  y = 2.5nm Loss of luminosity falls not so steep, for  y/  y =±1 O(30%) (TESLA: for  y/  y =±1 O(40%))

4. Isabell-A. Melzer-Pellmann ILC-tech meeting, 24.8.2006 4 Offset scan with ILC parameters ILC parameters: ILC 500 NOM:  y = 5.7nm ILC 500 LOW Q:  y = 3.5nm ILC 500 LARGE Y:  y = 8.1nm ILC 500 LOW P:  y = 3.8nm ILC 1000 NOM:  y = 3.5nm ILC 1000 LOW Q:  y = 2.5nm ILC 1000 LARGE Y:  y = 7.0nm ILC 1000 LOW P:  y = 2.7nm Loss of luminosity falls not so steep, for  y/  y =±1 O(30%) (TESLA: for  y/  y =±1 O(40%))

5. Isabell-A. Melzer-Pellmann ILC-tech meeting, 24.8.2006 5 Angle scan with ILC parameters ILC parameters: ILC 500 NOM:  y = 14.3  rad ILC 500 LOW Q:  y = 17.5  rad ILC 500 LARGE Y:  y = 20.2  rad ILC 500 LOW P:  y = 18.9  rad ILC 500 HIGH L:  y = 17.5  rad ILC 1000 NOM:  y = 11.7  rad ILC 1000 LOW Q:  y = 12.4  rad ILC 1000 LARGE Y:  y = 11.7  rad ILC 1000 LOW P:  y = 13.4  rad ILC 1000 HIGH L:  y = 12.4  rad Changing variable angle_y in Guinea-Pig results in almost no change (tested also with TESLA parameters) - contacted Daniel Schulte… waiting for response

6. Isabell-A. Melzer-Pellmann ILC-tech meeting, 24.8.2006 6 Next step: include ‘banana effect’ Banana effect: internal bunch deformations, induced by single-bunch wakefields in the linac. TESLA TDR: single bunch correlated emittance growth expected to be 6% in average. Results from beam-beam simulation with GUINEA-PIG from TESLA TDR

7. Isabell-A. Melzer-Pellmann ILC-tech meeting, 24.8.2006 7 Next step: include ‘banana effect’ For these plots a ‘banana shape’ beam needs to be feeded into Guinea-Pig Simulated ‘banana’ from MERLIN not yet available. Idea: just generate beam with ILC parameters and change it linearly by average of 6% (number from TESLA TDR) Status: generated beam (without change yet) fed into Guinea-Pig, compared beam generated by Guinea-Pig with my generated beam after interaction (output from Guinea-Pig) - see next pages  differences observed need to check this before further simulation can be run. wrong calculation of x’, y’? x/  m y/  m z/  m

8. Isabell-A. Melzer-Pellmann ILC-tech meeting, 24.8.2006 8 Comparison: Guinea Pig generated beam vs my generated beam (after interaction) Guinea-Pig generated With root random number generator generated beam. z/  m x/  m y/  m z/  m y/  m x/  m

9. Isabell-A. Melzer-Pellmann ILC-tech meeting, 24.8.2006 9 Comparison: Guinea Pig generated beam vs my generated beam (after interaction) Guinea-Pig generated With root random number generator generated beam. x/  m y/  m

10. Isabell-A. Melzer-Pellmann ILC-tech meeting, 24.8.2006 10 Comparison: Guinea Pig generated beam vs my generated beam (after interaction) Guinea-Pig generated With root random number generator generated beam. x/  m z/  m z-distribution seems ok x-distribution seems ok exept around 0

11. Isabell-A. Melzer-Pellmann ILC-tech meeting, 24.8.2006 11 Comparison: Guinea Pig generated beam vs my generated beam (after interaction) Guinea-Pig generated With root random number generator generated beam. z/  m y/  m y-distribution has large tails