1. 63rd CAST collaboration meeting
Development of filter-like cavities for axion DM searches (RADES project)¶
63rd CAST collaboration meeting
January 24, 2017
Antonio José Lozano Guerrero, Alejandro Álvarez Melcón, Benito Gimeno Martínez, Igor García Irastorza, Javier Redondo, Carlos Peña, Juan Daniel Gallego and Alejandro Díaz Morcillo 1

2. 63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017
INDEX
Theory
Proposed structure: several microwave cavities
Resonant frequencies
Electric Field patterns
Form factor
Quality factor
Simulation software (CST and HFSS)
5 cavities with metallic walls
5 cavities with metallic walls and rounded edges
5 cavities with metallic walls, rounded edges and 2 probes
5 cavities with metallic walls manufacturing
Venting holes, probe position and configuration
Important dates for RADES cavity
Present and Future Actions and Tasks
63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017 2

3. 63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017
Theory
Proposed structure: several microwave cavities
Resonant frequencies
Electric field patterns
Form factor
Quality factor
Simulation software
CST
HFSS
63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017 3

4. 63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017
5 cavities with metallic walls
CST
HFSS
Mode 1 Electric field
fr1= GHz(GHz)
fr1= GHz(GHz)
Q1= (GHz)
Q1= (GHz)
C1= (GHz)
63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017 4

5. 63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017
5 cavities with metallic walls and rounded edges
CST
HFSS i
fri (GHz) Qi 1
7016.1 2
7340.8 3
7628.9 4
8040.1 5
8448.1 i
fri (GHz) Qi Ci 1
6598.5
0.694 2
6944.1
2.3e-6 3
7219.0
1.7e-5 4
7617.2
1.7e-9 5
8022.8
2.9e-6
63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017 5

6. 63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017
5 cavities with metallic walls, rounded edges and 2 probes
CST
HFSS i
fri (GHz) Qi 1
7202.6 2
7476.0 3
7738.3 4
8150.0 5
8545.2 i
fri (GHz) Qi Ci 1
2121.0
0.6932 2
4972.0
3.17e-5 3
3940.4
0.0082 4
5797.1
3.02e-6 5
7547.2
1.51e-4
63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017 6

7. 63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017
5 cavities with metallic walls, rounded edges and 2 probes
Scattering parameters
CST
HFSS
Input/output probes are designed for critical coupling
S11
S21
63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017 7

8. 63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017
5 cavities with metallic walls manufacturing
Manufacturing
Fabrication model (Solidworks)
Rounded Edges
63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017 8

9. 63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017
5 cavities with metallic walls manufacturing
Manufacturing
90º connector
3D Model
63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017 9

10. 63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017
Venting Holes, probe position and configuration
E-Field H-Field
Final issues are being considered
63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017 10

11. 63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017
Important dates for RADES cavity
Cavity manufacturing started
16/01/2017
Data acquisition system started
16/01/2017
Cavity manufactured
24/02/2017
Cavity coating
24/03/2017
Cavity EM characterization
28/04/2017
Data acquisition system trials
28/04/2017
Cavity installation
May 2017
Expected
63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017 11

12. 63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017
Present and Future Actions and Tasks
Study of venting holes and critical coupling
Final considerations are being taken into account to start the 5 cavities filter manufacturing
Data acquisition system is being developed
Studies considering just one port are an interesting alternative and more work is envisaged in this direction
Analysis of mechanical tolerances
Platform for mounting the filter structure used by CAPP group has to be explored
63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017 12

13. 63rd CAST collaboration meeting
Development of filter-like cavities for axion DM searches (RADES project)¶
63rd CAST collaboration meeting
January 24, 2017
Antonio José Lozano Guerrero, Alejandro Álvarez Melcón, Benito Gimeno Martínez and Igor García Irastorza
Thank you! 13