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![Page 1: Neutrino Factories and Muon Ionization Cooling Channels D. Errede HETEP University of Illinois 17 March, 2003.](https://reader036.fdocuments.in/reader036/viewer/2022062423/56649e765503460f94b77696/html5/thumbnails/1.jpg)
Neutrino Factories and
Muon Ionization Cooling Channels
D. Errede
HETEP University of Illinois
17 March, 2003
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Why build a Neutrino Factory?(Physics, of course)
What does a Neutrino Factory look like?
In particular, what is an ionization coolingchannel? What has the University of Illinois been doing with respect to a cooling channel?
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17 March, 2003 3
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The Physics of Neutrinos• Neutrino masses
(pattern of the all fermion masses)
• Neutrino oscillation parameters
(fill in the CKM matrix for leptons)
• CP Violating processes in the Lepton Sector
(origin of baryon-antibaryon asymmetry in
our universe?)
• GUTS: relating properties of quarks and leptons
Is there a grand unified scheme?
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Fermions.ps
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The Physics of Neutrinos
13 12 13 12 13
23 12 13 23 12 23 12 13 23 12 13 23
23 12 13 23 12 23 12 13 23 12 13 23
ic c c s s e
i ic s s s c e c c s s s e c s
i is s s c c e s c s c s e c c
Standard form for Mixing Matrixconnecting weak and mass eigenstates
are the 4 real parameters that describe the mixing… 0 implies CP violation. (phase between 0 and 2
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The Physics of Neutrinos• Connect two weak eigenstates with the
evolution operator – involves Hamiltonian H0
• Use two assumptions: m1 < m2 << m3 and
dM2 = dm2atm = dm2
32 ~ dm231 we get
22 2
13( ) 1 sin (2 )sin ( )4atm
e em L
P v vE
22 2 2
23 13( ) sin (2 )sin (2 )sin ( )4atm
em L
P v vE
22 2 2
23 13( ) cos (2 )sin (2 )sin ( )4atm
em L
P v vE
And something similar but more complicated for
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The Physics of NeutrinosThe sign of m2 : solar neutrinosMatter effects : MSW (Mikheev, Smirnov, Wolfenstein)
e interacts with electrons in matter through the charged current interaction. This adds a term to the evolution operator.
There is a resonance in matter near a = 1 for typical values of sin22 (10-3 - 10-2)
“a” depends on Ne, GF, E, m2 .
= 12 , 13
22
2 2
sin 2sin 2
(cos 2 ) sin 2m
a
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The resonance applies to neutrinos for positive dm2 and antineutrinos for negative m2.
Thus we can get the mass hierarchy.
-----m3 -----------m2 -----------m1
OR-----------m2-----------m1
-----m3
The Physics of Neutrinos
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The Physics of Neutrinos
2 3 3 332
2 5 6 721
223
213
212
2
2
2
3.5 10 3.5 10 3.5 10
5 10 6 10 1 10
sin 2 1 1 1
sin 2 0.04 0.04 0.04
sin 2 0.8 0.006 0.9
0, / 2 0, / 2 0, / 2
sin 0, 1 0, 1 0, 1
sin 2 0.98 0.98 0.98
sin 2 0.04 0.04 0.04
sin 2 0.78 0.78 0
atm
reac
solar
dm
dm
.78
0.02 0.006 0.88J
3 Plausible Sets of Values
1 2 3
J - Jarlskog factor a measure of CP violatioin
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J = c12 c132 c23 s12 s13 s23 sin
Jarlskog J-factor a measure of CP violation
CP Operation: C(eL) = eL
P(eL) = eR
CP Violating Process:
For example: in vacuum
…
( )1
( )e
e
N
N
The Physics of Neutrinos : CP VIOLATION
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The Physics of NeutrinosCP Violating Processes in the Lepton Sector
Why is this interesting/fun/exciting?
A possible explanation for Baryogenesis.(So far CP violating processes in the b quark sector are insufficient to explain baryogenesis)
A SCENARIOHeavy Neutral Leptons: Majorana neutrinos through see-saw mechanism produces a light neutrino pair and a heavy neutrino pair.
N e- H+ or e+ H- (both massless particles because this is occuring before EW symmetry breaking).
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The Physics of NeutrinosN e- H+ or e+ H-
CP Violating processes provides excess of e+,,+
over e-,,- before EW phase transition.
Andrei Sakharov says we also need non-equilibrium conditions so that these processes are not driven to equalize the numbers.
Standard Model nonperturbative processes violate B, L, butconserve B-L. Churns lepton+’s into baryon material.
Thank you Boris Kayser
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The Physics of NeutrinosCP Violation in the Lepton Sector
What would this have to do with CP violating processes in the low mass neutrino sector?
We don’t know, but certainly CP violation in leptons at low mass makes CP violation in leptonic interactions at high mass scales more plausible.
GUTs: one can also imagine unifying quarks and lepton such that their CKM matrices are also related. We won’tunderstand this until all the parameters are measured.
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Neutrino Factory1. High intensity beam on target to produce particles
(’s) for a secondary beam. - Proton Driver + Target
2. Collects ’s, allow them to decay into muons, spread bunch (large E) and then perform phase rotation – Drifts + Induction Linacs
3. Reduce energy (and emittance) between induction linacs – Minicooling
4. Adiabatically change from one lattice to the next lattice – Matching Sections
5. Divide long bunch (~100 m) into short bunches that cooling section can handle - Buncher
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Neutrino Factory
6. Reduce beam emittance – Cooling Channels
7. Accelerate to energy and emittance size that the next recirculating accelerators can handle - Linac
8. Accelerate from 2.8 GeV to 20 GeV – Recirculating Linear Accelerators (RLA’s)
9. Circulate muons and let some decay on production straight – Muon Storage Ring
10. Make measurements on neutrino interactions – Near and Far Detectors
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Neutrino Factory: Proton Driver
• Based on Feasibility Study 2 version of a neutrino factory…hence set at Brookhaven Natl Lab
• AGS proton driver uses existing ring, bypasses existing booster and introduces 3 new superconducting linacs.
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Neutrino Factory: AGS Proton Driver Parameters
Total beam power (MW) 1
Beam Energy (GeV) 24
Average beam current (A) 42
Cycle time (ms) 400
Number of protons per fill 1 x 1014
Average circulating current 6
No. of bunches per fill 6
No. of protons per bunch 1.7 x 1013
Time between extracted bunches (ms) 20
Bunch length at extraction, rms (ns) 3
Peak bunch current (A) 400
Total bunch area (eV-sec) 5
Bunch emittance, rms (eV-sec) 0.3
Momentum spread, rms 0.005
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AGS Proton Driver Layout
To target station
High Intensity Source plus RFQ
116 MeV Drift Tube Linac(first sections of 200 MeV Linac)
Superconducting Linacs
400 MeV
800 MeV
1.2 GeV
Booster
AGS1.2 GeV 24 GeV
0.4 s cycle time (2.5 Hz)6 bunches
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Neutrino Factory: Superconducting Linacs
Period Cryo-Modules
Insertionat room temp
C D
A B
cavity
cavity
A B
Topology of a Period
C D
Configuration of the cavities within the cryo-modules
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Injection turns 360
Repetition rate (Hz) 2.5
Pulse length (ms) 1.08
Chopping rate (%) 65Linac average/peak current (mA) 20/30
Momentum spread +/- 0.0015Norm. 95% emittance (m rad) 12
RF Voltage (kV) 450
Bunch length (ns) 85
Longitudinal emittance (eV-s) 1.2
Momentum spread +/- 0.0048Norm. 95% emittance (m rad) 100
AGS Injection Parameters
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AGS Proton Driver
AGS : Harmonic 2418 bunches
Bunch pattern for using harmonic 24 to create 6 bunches
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Neutrino Factory : TargetEnergy on target 24 GeV, baseline beam power 1 MW,Pion momentum distribution peaks at 250 MeV,
<pT> = 150 MeV large angles coming off target….
Capture with 20 Tesla solenoid (r = 7.5cm, pTmax= 225 MeV).Actually a horn which “tapers” to 1.25 T (r= 30cm,
pTmax= 67.5 MeV)(A horn converts transverse momentum into longitudinal
momentum.)
Target: High Z maximize yield of /p
Goal of 2 1020 muon per year (107 seconds) decaying in detector direction, 50 kT, 1800 km away.
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Neutrino Factory : Target Z
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Neutrino Factory : Target
• Liquid Hg jet target chosen for maximum yield.
• Need to handle 1 – 4 MW beams.
• Want vjet = 30m/s to resupply Hg. Tests achieved 2.5 m/s to date. ( 30m/s only resupplies mercury before next
bunch on average – 6 x 2.5 Hz = 15/sec )
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Target R&D for MW-Scale Proton Beams• Carbon Target tested at AGS (24 GeV, 5E12 ppp, 100ns)
– Probably OK for 1.5 MW beam … limitation: target evaporation
Target ideas for 4 MW: Water cooled Ta Spheres (P. Sievers), rotating band (B. King), conducting target, Front-runner = Hg jet
13 Tesla
CERN/Grenoble Liquid Hg jet tests in 13 T solenoid– Field damps surface tension waves
0 Tesla BNL E951: Hg Jet in AGS beam– Jet (2.5 m/s) quickly re-establishes itself. Will test in 20T solenoid in future.
t = 0 0.75 ms 2 ms 7 ms 18 ms
27
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Neutrino Factory : Drifts and Induction Linacs
• Beam has large energy spread.
• Drift allows beam to spread out to a long bunch length.
• Induction linacs accerlate late muons (lower energy) and decelerate early muons (higher energy).
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Neutrino Factory : Drifts and Induction Linacs
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Neutrino Factory : Drifts and Induction Linacs
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Neutrino Factory : Drifts and Induction Linacs
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Neutrino Factory : Drifts and Induction Linacs
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Neutrino Factory : Drifts and Induction Linacs
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Neutrino Factory : Minicooling in Drifts and Induction Linacs
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Neutrino Factory : Buncher and Cooling Channel
In order to fit muon beam into cooling lattice the Buncher separates the ~100m long trail of muons into rf buckets.
The cooling channel (Pnominal = 200 MeV) then reduces the transverse emittance to a level acceptable for acceleration to 20 GeV.
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Momentum-time distributions through the buncher
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Neutrino Factory : Buncher and Cooling Channel
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Momentum-time distributions through the buncher
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Neutrino Factory : Cooling ChannelLattice Cell
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Neutrino Factory : Cooling Channel
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Neutrino Factory : Cooling Channel
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Neutrino Factory : Cooling Channel
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Neutrino Factory : Cooling Channel
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Neutrino Factory : Cooling Channel
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Neutrino Factory : Cooling Channel
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Neutrino Factory : Cooling Channel
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Absorber : Forced Flow Design
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Approximate Equation Transverse Emittance in a step ds along the particle’s orbit:
2
3
(0.014 )1
2N N T
R
dEd GeV
ds ds E E m L
First term is the Ionization Energy Loss (Cooling) TermSecond term is the Multiple Scattering (Heating) term
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Absorber Aluminum Window Pressure/Burst Testing
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MUCOOL: UIUC Absorber Instrumentation Project
ZachConway
Mike Haney
DebbieErrede
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MUCOOL RF R&D
High Power 805 MHz Test Facility12 MW klystron
Linac-type modulator & controlsX-Ray cavern
5T two-coil SC SolenoidDark-current & X-Ray instrumentation
Need high gradient cavities in multi-Tesla solenoid field
Concept 1 – open cell cavity withhigh surface field
Concept 2 – pillbox cavity - close aperture with thin conducting foil
805 MHz Cavity built & testedSurface fields 53 MV/m achieved Large dark currents observedBreakdown damage at highest gradientsLots of ideas for improvement
805 MHz Cavity built & being tested
53
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Neutrino Factory : Cooling Channel
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Construction of FODO Quad Cooling Cell
1/2 1/2 abs F rf D rf F rf D abs
COOLING CELL PHYSICAL PARAMETERS:
Quad Length 0.6 mQuad bore 0.6 mPoletip Field ~1 TInterquad space 0.4 - 0.5 mAbsorber length 0.35 m *RF cavity length 0.4 - 0.7 m*Total cooling cell length 4 m
*The absorber and the rf cavity can be made longer if allowed to extend into the ends of the magnets.
Or, more rf can be added by inserting another FODO cell between absorbersIn this design For applications further upstream at larger emittances, this channel can
support a 0.8 m bore, 0.8 m long quadrupole with no intervening drift without matching to the channel described here.
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• MOVIE• Quad cooling movie / Kyoko Makino• GSview - View – fit window – full screen – page
down - escape
Quad Cooling Beam Dynamics GroupUIUC – Debbie Errede, Kyoko Makino, Kevin PaulMSU – Martin BerzFERMILAB – Carol Johnstone, A. Van Ginneken
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Recirculating Linear Accelerators (RLAs)
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Recirculating Linear Accelerators (RLAs) :Preaccelerator
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Recirculating Linear Accelerators (RLAs) :Preaccelerator
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Recirculating Linear Accelerators (RLAs) :Preaccelerator
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Recirculating Linear Accelerators (RLAs) :Preaccelerator
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Recirculating Linear Accelerators (RLAs) :Preaccelerator
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Recirculating Linear Accelerators (RLAs) :Preaccelerator
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Recirculating Linear Accelerators (RLAs) :Injection Chicane from Linac to RLA
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Recirculating Linear Accelerators (RLAs) :Arcs
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Recirculating Linear Accelerators (RLAs) :Arcs
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Recirculating Linear Accelerators (RLAs)
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Recirculating Linear
Accelerators (RLAs)
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Muon Storage Ring
• Maximize number of muon on production straight fs = Ls/C• Minimize length of arcs
Real Estate is an important issue here.
• Larger energy decreases angular beam spread (1/) allowing more neutrinos on “target” = detector
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Real Estate is an important issue here! : ARCS
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COSY : Kyoko Makino (UIUC), Martin Berz (MSU)
Tracking performed on a single arc cell.
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COSY : Kyoko Makino (UIUC), Martin Berz (MSU)
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Same Lattice with End Fields added
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Conclusions
• Neutrino physics is fascinating, beautiful and accessible.• A Muon Collaboration exists that has done two feasibility studies on neutrino factory designs and R&D on targetry, absorbers, 800 (200) MHz NCRF cavities, solenoid magnets, and constructing a test area off of the Fermilab 400 MeV/c proton linac. Design studies for Ring Coolers, FFAG machines, Emittance Exchange are ongoing.• Alternative technologies pursued at CERN and in Japan.• Future plans include the construction of a cooling channel lattice cell to be tested in a low intensity muon beam at Rutherford Labs near Oxford, England.