New group at RWTH Aachen University III. Physikalisches Institut B Prof. Achim Stahl / Prof....
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Transcript of New group at RWTH Aachen University III. Physikalisches Institut B Prof. Achim Stahl / Prof....
New group at RWTH Aachen UniversityIII. Physikalisches Institut B
Prof. Achim Stahl / Prof. Christopher Wiebusch
Main activities:CMS (Si-Tracker, data analysis, Tier-2)Double Chooz / T2K / IceCubeGRID computing & applications in medical physics
beta-beams:group of under-graduate students
Marcel Weifels – Michaela Schaumann – Bastian Kargoll – Jakob Wehner – Markus Lauschergoal: conceptional layout and physics potential for beta-beams at DESY
Achim Stahl – RWTH Aachen University 23-Oct-2008
View beta-beams as part of a European neutrino program
Laguna: Large Neutrino Detector as core of the program
LENA LENA oror GLACIERGLACIER or or MEMPHISMEMPHIS
Physics Goals:Geo-Physics: Neutrinos from the core of the earth; heat release
from the core; relevant for our climatParticle Physics: Proton decay; unification of forces, GUT theories
large volume detector!Particle Physics: Neutrino oscillations; atmospheric , reactor
(depends on detector technology), accelerator :beta-beams & super beam: CP-violation, origin of matter
Astrophysics: Observation of -emission from super-novaeSN1987A hundreds of observations
Nuclear Physics: Understanding -cross sections, i.e. cooling of super novae
Potential tests of discrete symmetries
Potential tests of discrete symmetries
CExample:Test of charge conjugation
C-violation implies P-violation,if CP is conserved.
Potential tests of discrete symmetries
T
Example:Test of time invariance
CPT-theorem:T violation implies CP violation
Need e beam and beam
Potential tests of discrete symmetries
T
Example:Another possibility to test Tinvariance.
Need e beam and beam
Potential tests of discrete symmetries
CPT
Example:additional CPT tests and systematic checks with
neutrino and antineutrinos
Need e beam and beam
conventional -beamfrom pion-decay&&
e / e beam / beam
conventional -beamfrom the SPL
LHC upgrade scenario
Need e beam and beam
conventional -beamfrom pion-decay&&
optimal baseline(1st oscillation max.)
optimal baseline(1st oscillation max.)
134 km @ 1 GeV 300 km @ = 1501000 km @ = 500
e / e beam / beam
detector
optimal baseline
optimal baseline e
1 detector only (price)
hard to accomodate bothbaselines from one lab.
300 km @ = 1501000 km @ = 500
134 km @ 1 GeV
DESY
L=960 km
Kinematics:
Event rate in the detector (for fixed number of decays in the decay ring):
dep. on Opening angle ~ 1/ flux at fixed distance ~ 2
Elab ~ optimal baseline ~ flux at detector ~ 1/2
Elab ~ cross section ~
~
dep. on E*
Opening angle independent of E*
Elab ~ E* optimale Baseline ~ E* flux at detector ~ 1/E*2
Elab ~ E* cross section ~ E*
~ 1/E*
Inside the long HERA tunnel which was just shutdown before we came to DESY. The experiments ( like ZEUS in the previous photo ) are being dismantled. Asking the CEO of DESY what they will do with HERA after they have dismantled the experiments he just shrugged and said that they currently have no idea?!?
Comment from the summer student who took the picture
for beta-beams:
reuse tunnel
dipoles unusable
can we use ?• cryo plant• power supplies• vacuum equipment • …
12 T dipole2 x 35 m length
Injection
Acc
eler
atio
n
Dec
ay s
ectio
n
appr
ox. 2
2% o
f the
ring
, poi
ntin
g do
wn
at 5
°, lo
wes
t poi
nt 1
00m
bel
ow H
ERA
Pre
acc
ele
rato
r„H
alle
West
“
accelerator in HERA tunnel used as
decay ring and for final acceleration
12 T dipole35 m length
Preaccelerators
final energy 50 MeV2 bunch trains: 400 bunches
final energy 4.7 GeV corresponding = 0.8
final energy 120 GeV after 5 turnsTESLA linac 35 MV/m
final energy 1.4 TeV (=500)ramp at 0.5 T/sec (20 sec tot.)500 sec decay at max. energydeaccelerate and dump
Is 6He the best isotope ?500 sec lifetime at =500
Time Structure & Intensity
bunch trains:2 trains800 m long (2.7 sec)3469 bunches1.3 GHz frequency
structure of cycles:creation of ions: 0.1 secpreacceleration: 20 secramp of main ring: 20 sec < 20% lossactive decays: 400 sec ~ 22% in straight sectiondeaccelerate: 20 sec
sum: ~ 500 sec
intensity (100% efficiency !):2.6 1010 ions per bunch2.7 1013 usefull per cycle5.8 1017 per year
We cannot afford a copy of EURISOL at DESY Most likely the largest problem !
Try an idea from T. Hirsch/M. Hass Weizmann
ionization bunching linac
SARAF @ Weizmann: 40 MeV d-Beam 2 mA
we need 3.6 1011 ions/sec
but very different time structure
a dream ?
bunches
thin target
can it work like that ?
I‘ll stop speculating here
Have not thought about 18Ne
FP6 scenario
Plots from Walter Winter / Patrick Huber
beta-beam @ DESYSuper-beam from SPLWater-Cerenkov Det @ Frejus
very similar sensitivity
• We hope to become an associate member of the FP7
project
• Cooperation with FZ Jülich (COSY) has started
• First discussions with DESY
• Workshop on future particle & nuclear physics projects on
13./14. November in Frankfurt
• Will apply for funding starting July 2009
Main topics for our work
• Conceptional layout
• Ion source
• Physics studies