Next Generation Axion Search At Fermilab Andrew Sonnenschein April - - PowerPoint PPT Presentation

Next Generation Axion Search At Fermilab

Andrew Sonnenschein April 2018

New ADMX Result

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ArXiv 1804.05750 & PRL April 2018

• Leap in sensitivity due to reduced noise temperature.
• Can now test DFSZ axion models over significant mass range.

Quantum-limited amplifiers

MSA

< 1 GHz > 1 GHz

Timeline For Current and Next Generation Experiment

4 FY2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 0.6-0.8 GHz Running Approved 0.8-1.5 GHz ADMX-G2 R&D Construction 1.5-2 GHz 2-2.5 GHz Extended ADMX-G2 2.5-3.5 GHz 3.5-4 GHz R&D Towards Next Generation Experiment: Magnet construction X Next Generation Experiment Quantum Sensors, Magnets, Resonators Run 4 Construction 4 GHz- 6 GHz Run 5 Construction 6 GHz - >

• ADMX- G2 Approved for operation through 2021 at University
• f Washington.
• We hope to extend running at U Wash to 2024.
• Next generation experiment could be located at Fermilab

with construction starting as early as 2022.

What Fermilab Brings to Axion Searches

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Scan Rate Vs Frequency & other parameters Quantum Sensors Reduce Noise (qubits, etc.) Higher Magnetic Field Increases Signal Arrays of Cryogenic RF Resonators Increase Volume

Quantum Sensors for Axion Detection

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• Aaron Chou leads effort to use qubits as

single photon counters for microwaves.

• Reduce noise levels below standard

quantum limit. Potentially many orders

• f magnitude in power sensitivity.
• New LDRD- funded facility in Lab B with

large dilution refrigerator and 15- Tesla x 90 mm magnet.

• Support from Heising- Simons

foundation.

• DOE Quantum Sensor initiative.

1 K plate

100 mK Plate

1 K Vertical Cold Fingers

Layer 1: Piezoelectric Actuators Layer 1: 1K plate Layer 1: 100 mK Cavity Array k

Layer 2

100 mK Vertical Cold Finger

Fermilab 14- Cavity Array Concept for 2-4 GHz

• Fermilab leads ADMX resonator design for 2-4 GHz range.
• Requires complex mechanical assemblies at 100 mK with

many moving parts.

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Confidential FSU / NHMFL

Concept for new ADMX magnet: 32 T, 16 cm

Field 32 T Winding Inner Radius 78 mm Winding Outer Radius 168 mm High Field Length (B >82% Bmax) 172 mm Winding Length 513 mm

31July2 017 9

Breakthrough 1: REBCO (rare-earth Ba2Cu3O7) tape ultra-high field magnet

• high critical field and
• high mechanical strength

Breakthrough 2: No electrical insulation on the conductor.

• allows reduction of the amount of copper required for coil protection.
• dramatically more compact coils and lower capital costs.

NI-REBCO technology was pioneered by Seungyong Hahn, an associate professor at FSU and the MagLab. This design was generated by Denis Markiewicz who has developed dozens of world record superconducting

• magnets. Iain Dixon and Mark Bird (NMHFL) also involved.
• Assoc. Prof.

Seungyong Hahn Florida State Univ. Distinguished University Scholar

• W. Denis Markiewicz

Florida State Univ.

1 m

Why Propose this as “Flagship” for Cosmic Frontier?

• Direct WIMP detection opportunities limited after conclusion of LZ &
• SuperCDMS. Axion searches are only now reaching interesting sensitivity

and will remain scientifically relevant for many years– best opportunity to find DM in post-WIMP period?

• Cosmic frontier at Fermilab suffers from lack of major experimental

facilities on site. Axion searches could provide this.

• Exploits major lab capabilities in cryo engineering, superconducting

sensors, RF cavities and magnets.

• Synergy with DOE quantum sensors program.
• Fermilab is lead lab for current ADMX-G2 & best positioned of DOE labs

for next generation experiment.

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