Rebecca Glaudell CERN REU 2013 beabp cC3 with thanks to rogelio tomas garcia Javier Barranco Garcia BE ABP CC3 Be ams department A ccelerator B eam P hysics ID: 402620
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Slide1
Final focus system optimization
Rebecca Glaudell
CERN REU 2013
be-abp
-
cC3
with thanks to:
rogelio
tomas
garcia
Javier
Barranco
GarciaSlide2
BE – ABP – CC3
Be
ams department
A
ccelerator
B
eam
P
hysics
C
LIC +
C
TF
3Slide3
BE – ABP – CC3
Be
ams department
A
ccelerator
B
eam
P
hysics
C
LIC +
C
TF
3
Rogelio Tomas
Javier
BarrancoSlide4
CLIC is a “compact”
linear collider.Slide5
The Final Focus System
is part of the Beam Delivery System.
The Final Focus System (FFS) is focuses the beam near the interaction point (IP).
Within the FFS, there are nine
sextupoles that can focus a beam with energy spread.Slide6
The
sextupoles
can have their location and strength adjusted to minimize sigma.
The program MapClass2 simulates the beam and the FFS system.
While higher order calculations of the beam spread are necessary, they are time consuming.Slide7
Nelder
Mead’s Simplex Method will be used to minimize beam size.
There is no guarantee that the original
Nelder
Mead’s Simplex Method will look in the right direction, i.e. down the steepest gradient.Improved Nelder Mead method calculates pseudo-gradients to improve the search direction.
We must adjust the original simplex code and apply it to ALL sextupoles’ positions and strengths.Slide8
Anticipated obstacles:
I’m new to Python.
I’ve been calculating
σ
x. I want χ2.
Accuracy increases calculation time.10-dimensional simplexes will be difficult to minimize.Basically, there are many small things to change in the program that optimize the output and it will take a lot of time to find the best parameters.Slide9
I want to see mountains again,
m
ountains
, Gandalf!