ZETA (Neutron-Resonance-Spin Echo)2fdn.neel.cnrs.fr/IMG/pdf/journees_2fdn_2018/2FDN... · 2019. 1....
Transcript of ZETA (Neutron-Resonance-Spin Echo)2fdn.neel.cnrs.fr/IMG/pdf/journees_2fdn_2018/2FDN... · 2019. 1....
Le mur D23-IN22 ou
comment pouvoir utiliser ZETA sur IN22 et la 12T sur D23
Frederic BOURDAROT
Univ. Grenoble Alpes, CEA, INAC-MEM/MDN, Grenoble, France
ZETA (Neutron-Resonance-Spin Echo) To do what? § Measuring to the time of life of the excitations (phonon or magnon) of
few meV (ω) with a resolution of Δω ~ 10µeV. § High resolution Larmor diffraction : (Δd/d ~ 10-5-10-6)
• Macroscopic thermal expansion • Distribution of lattice parameter
Importance of the life time excitations excitations :
§ Optimization of thermoelectric Width expected ≈ 5-15 µeV – thermal triple axis spectrometer resolution 250µeV
§ For HTC, magnetic excitation life time => informationsabout the interaction magnon-magnon andmagnon-phonon unknown for these systems.
In practice : the life time of an excitation is given by the width of the excitation.
2SFN Decembre 2018 1
Le mur D23-IN22 ou
comment pouvoir utiliser ZETA sur IN22 et la 12T sur D23
Frederic BOURDAROT
Univ. Grenoble Alpes, CEA, INAC-MEM/MDN, Grenoble, France
2SFN Decembre 2018 2
During the experiment, only ωRF is chaning : the spectromètre stays at the maximum of the intensité and on the unfocused side of the dispersion to reduice ∂q.
Phonon group velocity
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NRSE
Principe : encoding the polarized neutron phase Φ = γnB0 x t With t = L/v
Other advantage of NRSE, depolarization is of 3rd order instead of 1st order for a solenoid.
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Le mur D23-IN22 ou
comment pouvoir utiliser ZETA sur IN22 et la 12T sur D23
Frederic BOURDAROT
Univ. Grenoble Alpes, CEA, INAC-MEM/MDN, Grenoble, France
2SFN Decembre 2018 3
1.3m|1.7m|1.3m
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2 guide-field coils
2 guide-field coils + 1 compensation coils
2 compensation coils
+ 8 flippers RF =16 coils Total : 23 coils
ZERO MAGNETIC FIELD CHAMBERS
Le mur D23-IN22 ou
comment pouvoir utiliser ZETA sur IN22 et la 12T sur D23
Frederic BOURDAROT
Univ. Grenoble Alpes, CEA, INAC-MEM/MDN, Grenoble, France
2SFN Decembre 2018 4
IN22 D23
12T=120kG 5-10G
0-2G
“soft” iron wall
Maximum stray field acceptable 3-4G ⇒ the wall has to divide by 3 the stray field.
Calculation of F. Thomas : “soft iron” wall of thickness 15mm => Strength on the coil ≈ 30 DaN
Le mur D23-IN22 ou
comment pouvoir utiliser ZETA sur IN22 et la 12T sur D23
Frederic BOURDAROT
Univ. Grenoble Alpes, CEA, INAC, MEM/MDN, Grenoble, France
2SFN Decembre 2018 5
D23
12T
Results : Agreement between calculations and measurements Reduction of the stray field sufficient to work with ZETA on IN22 and the 12T magnet on D23. Will be confirmed during experiment in 2019.
Le mur D23-IN22 ou
comment pouvoir utiliser ZETA sur IN22 et la 12T sur D23
Frederic BOURDAROT
Univ. Grenoble Alpes, CEA, INAC, MEM/MDN, Grenoble, France
2SFN Decembre 2018 6
Next steps for the upgrade of ZETA
RF-flippers need to be in resonance. The resonance is obtained with the help of variable capacitors.
4 new variable capacitors are going to be made by the LLB (S. Klimko) May 2019
Le mur D23-IN22 ou
comment pouvoir utiliser ZETA sur IN22 et la 12T sur D23
Frederic BOURDAROT
Univ. Grenoble Alpes, CEA, INAC, MEM/MDN, Grenoble, France
2SFN Decembre 2018 7
Next steps for the upgrade of ZETA
Current Walls
New walls end 2020. ZETAPLUS : 2021 MERCI