MADMAX: introduction and status Chang Lee on behalf of the MADMAX - - PowerPoint PPT Presentation
MADMAX: introduction and status Chang Lee on behalf of the MADMAX collaboration MPI for Physics 3rd Workshop on Microwave cavities and detectors for Axion Research Aug 24th, Livermore, CA, USA 1 MADMAX : Introduction and status C. Lee
Chang Lee on behalf of the MADMAX collaboration MPI for Physics 3rd Workshop on Microwave cavities and detectors for Axion Research Aug 24th, Livermore, CA, USA
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
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Our Universe:
Our Universe
PQ symmetry breaking after inflation
ma ~ 100 μeV
ma < 10 meV
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
Challenging for traditional resonant cavity due to smaller volume, lower Q
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preferred by post-inflation scenarios
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
generates propagating EM field.
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Ea = − gaγBe ε a
E∥,1 = E∥,2 H∥,1 = H∥,2
g H1 g E1 E1 a k1 Region 1 e1 = 4
Be
Region 2 e2 = 1 k2 g E2 E2 a
Be
x y z g H2
Ea
2
Ea
1
Eγ
1
Eγ
2
Be
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
~12 photons / day / m2 (@ 25 GHz)
Leaky resonator, boost factor:
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E0 = 1.3 × 10−12 [V/m] × ( Be 10T)
Q ∝ ε
β = E/E0
= λ 4n
n = 5 β ~10 standing wave propagating wave
P ∝ E2 ∝ β2
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
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Mirror Dielectric Disks Receiver
Be
coherent interferences
β2 ν
more N!
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
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with ~80 disks.
coverage
confirmation
80 discs
LnAlO3 50 MHz
Δν ν = 2 × 10−3
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
Psig x Δν is independent
to faster scan.
ttot_adj ≈ ttot_scan.
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24.8 25.0 25.2 25.4 25.6 20 40 60 80 100 120 140
tscan Δν = ( S N )
2
( kBTsys Psig )
2
Psig ∝ B2
0, β2, n, A, N, 1
Δν
same area
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
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MAgnetized Disk-and-Mirror Axion eXperiment
DESY, Univ. of Hamburg, CEA-IRFU, MPI for Radioastronomy, RWTH Aachen, Univ. of Zaragoza, MPI for Physics
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
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4K mirror
Cover the QCD axion @ 10—100 GHz
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
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equation solved by analytic, FEM, ray tracing, and other methods.
confirmed.
3D effects, boundary loss, diffraction
dielectric disk
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
confirmed by the reflectivity and group delay measurements.
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0.5 1 1.5 2 2.5 3 3.5 4 4.5 0.05 0.1 0.15 0.2 0.25 0.3 14 16 18 20 22 24
Group delay [ns] Reflectivity Frequency [GHz] Reflectivity Measurement Reflectivity Simulation Group Delay Measured Group Delay Simulated
Boost Factor Reflectivity Group Delay (scaled)
80 discs
1 0.5
5 disks
measurement by S. Knirck & J. Egge
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
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FFT
(signal generator)
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
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internal parts to be measured. goal: ΔT < 0.5 K
temperature from HEMT
~0.48K @ 20 GHz
(JPA, TWPA, …) to be considered
tscan Δν ∝ T2
sys, Tsys = Tbg + Tamp
< 4K 5~6K
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
< 60μm precision for β ~1000.
+ high magnetic field
measurement at varying loads
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image by M. Matysek
μm
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
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single crystal
dielectrics ε = n2 tanδ Al2O3 10 10-5 LaAlO3 24 3 x 10-5 TiO2 100 3 x 10-5
1 Sapphire + mirror for 1 mirror + 1 disk setup at resonance
βmax = 2n − 1 n
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
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~400 MJ stored in 2m x 1m2
by CEA Saclay & Bilfinger Noell GmbH
Noell Bilfinger CEA Saclay
Preliminary
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
HERA north hall (H1)
for magnets
weight (~150 tons)
18 image from http://h1.desy.de
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
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Preliminary design 20 x Φ30 cm disks Mirror + motors 3~4 T
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
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Prototype Full scale: 80 x 1m2 disks, 10T magnet in 202x?
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
interesting target for post- inflation QCD axion search.
promising technique.
aiming to cover the parameter space.
JCAP01 (2017) 061 MADMAX white paper
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MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
β = E / E0
δ = n x d x ν = π, 3π, 5π… constructive interference.
δ = π/2, 3π/2, … disks + mirror forms a leaky resonator.
contributions.
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mirror disk
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
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E∥,1 = E∥,2 H∥,1 = H∥,2
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
diffraction
high B field
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Incident Wave Reflected / Transmitted Wave
MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
frequency can we cover?
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MADMAX: Introduction and status
3rd Workshop on Microwave cavities and detectors for Axion Research
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