UA9 experiment Emelie Nilsson Chalmers University of Technology Sweden Supervisor Dr Walter Scandale OUTLINE 1911 Students coffee session Crystal collimation the theory UA9 experiment in SPS ID: 577839
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Slide1
Beam halo collimation with bent crystals
UA9 experiment
Emelie Nilsson
Chalmers University of Technology, Sweden
Supervisor: Dr. Walter
Scandale
Slide2
OUTLINE1/9/11
Student's coffee session
Crystal collimation- the theory
UA9 experiment in SPS
Experimental results
Simulation of collimation system in ICOSIM
ConclusionSlide3
OUTLINE1/9/11
Student's coffee session
Crystal collimation- the theory
UA9 experiment in SPS
Experimental results
Simulation of collimation system in ICOSIM
ConclusionSlide4
Beam halo collimation
1/9/11
Student's coffee session
HOW?
Clean up momentum spread in beam
e
xtract protons from beam halo
WHY?
Protection and performance of machineSlide5
Particle interaction in crystals
1/9/11
Student's coffee session
Proton sees potential from crystalline planes
Critical angle
Path
of the protons is constrained by the crystal
planes if
Channeling
p
T
<
U
max
Slide6
Bent crystals: Additional effects
1/9/11Student's coffee session
Volume reflection:
Dechanneling
:
Volume capture:Slide7
Bent crystals in UA9
1/9/11Student's coffee session
Silicon crystals
2 mm long
Turned by
goniometers
Bent
crystal
Channeled
beam
Secondary
Tertiary
halo
Primary
beamSlide8
OUTLINE1/9/11
Student's coffee session
Crystal collimation- the theory
UA9 experiment in SPS
Experimental results
Simulation of collimation system in ICOSIM
ConclusionSlide9
Setup of UA91/9/11
Student's coffee session
In 5
th
straight section of SPS
270
GeV
single bunch proton beamSlide10
SPS measurements1/9/11
Student's coffee session
Angular scan: Losses when crystal in amorphous
vs channeling
Dispersive area scan: Study tertiary halo reduction
LHC-type
collimator scan: Crystal channeling efficiency
Exploring properties of crystal collimatorsSlide11
OUTLINE1/9/11
Student's coffee session
Crystal collimation- the theory
UA9 experiment in SPS
Experimental results
Simulation of collimation system in ICOSIM
ConclusionSlide12
LHC-type collimator
scan1/9/11
Student's coffee session
Gradual insertion of collimator, crystal in channeling position
Shower from
collimator
Analyze
halo generated by
crystal
Multi turn channeling efficiency: How many of the particles in the primary halo are
channeled?
Channeling kick: At what angle are the channeled protons directed?Slide13
Data from downstream BLM detector
1/9/11Student's coffee session
After peaks we should have reached 95 % of the particles in secondary haloSlide14
1/9/11
Student's coffee session
Scan detected by downstream
BLM:s
Channeling kick
Multiturn channeling efficiencySlide15
Results:1/9/11
Student's coffee sessionSlide16
OUTLINE1/9/11
Student's coffee session
Crystal collimation- the theory
UA9 experiment in SPS
Experimental results
Simulation of collimation system in ICOSIM
ConclusionSlide17
ICOSIM- simulating collimation systems
1/9/11Student's coffee session
Tracking
program for collimation studies in circular accelerator
Standard, magnetic or crystal collimator
CRYM: Emulation of particle-crystal interaction
Based on experimental
results
What kind of interaction? Channeling, amorphous…Slide18
Define setup of the SPS lattice
1/9/11
Student's coffee session
MAD-
X:
Q
uadrupoles
, collimators, aperture, beam…
Output: -
Betatron
function -Dispersion function -Tune…Slide19
Crystal collimator at 5 sigma
1/9/11Student's coffee sessionSlide20
Crystal collimator at 6 sigma
1/9/11
Student's coffee sessionSlide21
Crystal effects, turn by turn:
1/9/11Student's coffee session
1= No impinge on crystal
2= Impinge on crystal edge
3= Amorphous
behaviour
4= Channeling
5=
Dechanneling
6= Volume reflection
7= Volume capture
8=
Dechanneling
of volume
captureSlide22
Crystal (5σ) + Standard collimator (LHC) (6
σ)
1/9/11
Student's coffee sessionSlide23
OUTLINE1/9/11
Student's coffee session
Crystal collimation- the theory
UA9 experiment in SPS
Experimental results
Simulation of collimation system in ICOSIM
ConclusionSlide24
Conclusion1/9/11
Student's coffee session
Multiturn channeling efficiency of about 70%
Channeling kick to be confirmed by the ongoing experiment in SPS
Experimental results:
Simulations:
Interpret
output
Compare with experimental resultsSlide25
Conclusion1/9/11
Student's coffee session
Multiturn channeling efficiency of about 70%
Channeling kick to be confirmed by the ongoing experiment in SPS
Experimental results:
Simulations:
Interpret
output
Compare with experimental results
Crystal collimation is useful!
Let’s learn more about it!