Isabell-A. Melzer-Pellmann ILC-tech meeting, 24.8.2006 Status report of offset and angle studies...

Isabell-A. Melzer-Pellmann ILC-tech meeting, 24.8.2006

Status report of Status report of offset and angle studies offset and angle studies

with Guinea-Pig with Guinea-Pig

Isabell-Alissandra Melzer-PellmannIsabell-Alissandra Melzer-Pellmann

ILC tech meetingILC tech meeting

July 11July 11thth, 2006, 2006

2Isabell-A. Melzer-Pellmann ILC-tech meeting, 24.8.2006

Offset and angle scanfrom 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 frombeam-beamsimulation with GUINEA-PIGfrom TESLA TDR


Offset scan with ILC parameters

ILC parameters: ILC 500 NOM: y = 5.7nmILC 500 LOW Q: y = 3.5nmILC 500 LARGE Y:y = 8.1nmILC 500 LOW P: y = 3.8nmILC 500 HIGH L: y = 3.5nm

ILC 1000 NOM: y = 3.5nmILC 1000 LOW Q: y = 2.5nmILC 1000 LARGE Y:y = 7.0nmILC 1000 LOW P: y = 2.7nmILC 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%))


Offset scan with ILC parameters

ILC parameters: ILC 500 NOM: y = 5.7nmILC 500 LOW Q: y = 3.5nmILC 500 LARGE Y:y = 8.1nmILC 500 LOW P: y = 3.8nm

ILC 1000 NOM: y = 3.5nmILC 1000 LOW Q: y = 2.5nmILC 1000 LARGE Y:y = 7.0nmILC 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%))


Angle scan with ILC parameters

ILC parameters: ILC 500 NOM: y = 14.3radILC 500 LOW Q: y = 17.5radILC 500 LARGE Y:y = 20.2radILC 500 LOW P: y = 18.9radILC 500 HIGH L: y = 17.5rad

ILC 1000 NOM: y = 11.7radILC 1000 LOW Q: y = 12.4radILC 1000 LARGE Y:y = 11.7radILC 1000 LOW P: y = 13.4radILC 1000 HIGH L: y = 12.4rad

Changing variable angle_y in Guinea-Pigresults in almost no change (tested alsowith TESLA parameters) - contactedDaniel Schulte… waiting for response


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 frombeam-beamsimulation with GUINEA-PIGfrom TESLA TDR


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


Comparison: Guinea Pig generated beam vs my generated beam (after interaction)

Guinea-Pig generated With root random number generatorgenerated beam.

z/mx/m

y/m

z/m

y/m

x/m




x/m x/m

y/m y/m




x/m x/m

z/m z/m

z-distribution seems okx-distribution seems ok exept around 0




z/m z/m

y/m y/m

y-distribution has large tails

Isabell-A. Melzer-Pellmann ILC-tech meeting, 24.8.2006 Status report of offset and angle studies...

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