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 antonio.lozano@upct.es 1

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

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

63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017 5 cavities with metallic walls CST HFSS Mode 1 Electric field fr1=8.42066280 GHz(GHz) fr1= 8.421289115GHz(GHz) Q1=7156.9 (GHz) Q1=6591.9 (GHz) C1=0.6902 (GHz) 63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017 4

63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017 5 cavities with metallic walls and rounded edges CST HFSS i fri (GHz) Qi 1 8.420596770 7016.1 2 8.448550440 7340.8 3 8.523031110 7628.9 4 8.621142230 8040.1 5 8.706387520 8448.1 i fri (GHz) Qi Ci 1 8.422589670 6598.5 0.694 2 8.449913917 6944.1 2.3e-6 3 8524160515 7219.0 1.7e-5 4 8622054568 7617.2 1.7e-9 5 8707022885 8022.8 2.9e-6 63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017 5

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 8.419547710 7202.6 2 8.445770590 7476.0 3 8.521073870 7738.3 4 8.620148860 8150.0 5 8.706301660 8545.2 i fri (GHz) Qi Ci 1 8.41610 2121.0 0.6932 2 8.44657 4972.0 3.17e-5 3 8.52200 3940.4 0.0082 4 8.62099 5797.1 3.02e-6 5 8.70700 7547.2 1.51e-4 63rd CAST collaboration meeting Geneva, Switzerland, Jan 24, 2017 6

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

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

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

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

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

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

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 antonio.lozano@upct.es Thank you! 13