the hungarian contribution to the planned cern awake experiment
DESCRIPTION
The Hungarian contribution to the planned CERN AWAKE experiment. 5 December 2013, Zimányi SCHOOL’13 Budapest Imre F. Barna. Outline. - Introduction of the problem One possible solution - the AWAKE experiment (some slides are taken from Patric Muggli & Edda Gschwendtner) - PowerPoint PPT PresentationTRANSCRIPT
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The Hungarian contributionThe Hungarian contribution to the to the
planned planned CERN AWAKE experiment CERN AWAKE experiment
5 December 2013, Zimányi SCHOOL’13 Budapest5 December 2013, Zimányi SCHOOL’13 BudapestImre F. BarnaImre F. Barna
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OutlineOutline
- Introduction of the problem- Introduction of the problem
-One possible solution - the AWAKE experimentOne possible solution - the AWAKE experiment (some slides are taken from Patric Muggli & Edda Gschwendtner) (some slides are taken from Patric Muggli & Edda Gschwendtner)
-Our contribution Our contribution experimentalexperimental and and theoreticaltheoretical (it is a group activity not only mine, see later)(it is a group activity not only mine, see later)
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Recent accelerator technology (accelarating in vacuum with radio frequency)like LHC ring reached its physical, geometrical limitsLHC ring is 27 km long, the max. accessible accelarating gradient less than 50 MV/m in ring
What is the way out? Vacuum plasma Radio frequency quick charged particle/short laser pulse
The field of interestThe field of interest
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Laser-driven plasma-based accelarationslaser wake field accelaration (LWFA),
plasma beat wave acceleration (PBWA)
self-modulated LWF
multiple laser pulses in PBWA
Particle-driven plasma-based accelarationsproton-driven plasma wake-field (our field of interest)
electron-driven plasma wake-field
Dielectric Wall Accelarator relativistic particle beam wake in a non- linear dielectric
wave guide
Different accelaration mechanismsDifferent accelaration mechanisms
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Wakefield
All particles in the medium participate = collective phenomenon
Mach cone
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The idea of the AWAKE ExperimentThe idea of the AWAKE Experiment
(Fig. Is taken from Patric Muggli)
Short proton bunches are needed:Not possible to create directly Additional short laser pulse is used to 1) create the Rb plasma with single-ionized atoms 2) and the self-modulation is used to create short proton bunches
L≈ 100 μm
E
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Homogenous ionization is needed!!!
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Birdeye view of the CNGS- AWAKE Spot
CNGS: Cern Neutrinos to Gran Sasso project, Ran between 2006 - 2012
LHC ring
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Rubidium-85 energy levels
Idea:use a short chirped laser pulse to populate the 7s and 5d two-photon resonant excited states to enhance the total single-ionization cross sections in the GeV proton – Rb collisions andcreate a homogeneous plasma
(Model: with a laser-atom calculation coupled to ion-atom collisionincluding propagation phenomena)
Our contribution to improve theOur contribution to improve the AWAKE ExperimentAWAKE Experiment
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Rb dispenser
The experimental setup The experimental setup
The vacuum chamber
The Rb atom beam distribution above the slit
MCP detector
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Primary laser source - fs-duration system:
Ti:sapphire oscillator + regenerative amp.
Clean room: 3000-4000 particles / foot^3 the laboratory is used forHHG experiments, surface plasmons
The laser system The laser system
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Typical values806 nm 4.1W9 mm (1/e2 ,Gauss)Linear, vertical1 kHz 35 fs 0.25%800nm30nm
ParametersMean wavelengthAverage PowerBeam Diameter:Polarisation:Repetition Rate Pulse duration (FWHM):Energy. stab. rms (%): Medium wavelength:Bandwidth (FWHM):
Output parameters of the laser system
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0
The group has experience on manipulating atomic transitions with chirped laser pulses.Dynamics of the populations for positive and negative frequency chirp
I0>
I1>
I2>
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Our theoretical contributions
GP. Djotyan, JS. Bakos, G. Demeter, PN. Ignacz, MA. Kedves, Zs. Sorlei, J. Szigeti, Z.Toth, Phys.Rev A, 68, 053409 (2003)
I3>
I5>
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- there are some scaling laws available for single ionization in ion- atom collision but only from the ground state
from my Phd
http://geb.uni-giessen.de/geb/volltexte/2003/1036/pdf/BarnaImre-2002-07-03.pdf or I.F Barna, N. Grün, W. Scheid, Eur. Phys. J.D. 25, 239 (2002)
from my colleague:
C. Pfeiffer, N. Grün, W. Scheid, J. Phys. B: At. Mol. Opt. Phys. 79, 3621 (1997)
Proton - Rb collision
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-In ion-atom collision the semiclassical approx. is used the projectile is treated classicaly and flies on a straight line
- the Knudsen parameter describes the external field if Zproj/vproj < 0.1 perturbative regime, our case 1st Born approx is valid matrix element:
transition amplitude:
Total ionization cross section:
Work is in progress
- there are some scaling laws for single ionization in ion-atom collision but from the ground state
Proton - Rb collision
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Additional ideas, activity
Prof. Varró has analytic solutions for particles in underdense plasma in Dirac/KG Eq.
Mr. Pocsai Msc. Student studies the classical motion of charged particles in underdense plasma
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PublicationsPublications
or on the Preprint Server: http://arxiv.org/abs/1309.2442
Conference proceedings: First European Advanced Accelerator Concepts Workshop
accepted
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Additional accelerator coupled Additional accelerator coupled activities in Hungary/Wigner activities in Hungary/Wigner
In the planned ELI - ALPS superlaser at Szegedwe plan to accelerateelectrons and protons withshort laser pulses
accelerated protons planned to be used for hadron therapy
On Zimányi 2012 last year we had a bit more detailed talk: Particle accelarator at the ELI ALPS https://indico.cern.ch/conferenceOtherViews.py?confId=218974
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Thank you for your attention!