LINAC AG • IAP • Goethe Universität Frankfurt Development of Power Couplers for Superconducting Cavities and Setup of a Test Stand Development of capacitively acting power couplers for superconducting CH-cavities Frequencies: 217 MHz and 325 MHz RF power: 10-50 kW Duty factor: 1%-100% Electromagnetic simulations Thermal simulations for cooling optimization Setup of a coupler test stand Profiting projects: cw-Linac, HE-Linac-2 Theorie: Simulationen: Experimentell: H. Podlech, IAP

Superconducting CH-Cavity Development for the cw-Linac LINAC AG • IAP • Goethe Universität Frankfurt Superconducting CH-Cavity Development for the cw-Linac Development of 9 superconducting CH-cavities for the cw-Linac RF simulations to optimize geometry Structural mechanics simulations to predict microphonics, pressure sensitivity, MP, Lorentz-Force Detuning, material stress, cool down behaviour Profiting projects: cw-Linac Helium vessel Coupler flange Pickup flange Inclined end stem Tuner flange Preparation flange Theorie: Simulationen: Experimentell: H. Podlech, IAP

Investigation of Multipacting in Superconducting CH-Cavities LINAC AG • IAP • Goethe Universität Frankfurt Investigation of Multipacting in Superconducting CH-Cavities Capacitively acting bellow tuners are used for frequency tuning Danger of Multipacting within the tuner Prediction of MP depending on tuner geometry Validation with test resonator Profiting projects: cw-linac, HE-Linac-2, MYRRHA Theorie: Simulationen: Experimentell: H. Podlech, IAP

Investigation of BCP on the Frequency in Superconducting CH-Cavities LINAC AG • IAP • Goethe Universität Frankfurt Investigation of BCP on the Frequency in Superconducting CH-Cavities Buffered Chemical Polishing (BCP) is required to guarantee high performance of sc cavities Typically 100 mm of inner surface is removed Frequency shift still not known, difficult to simulate because of inhomogeneous removal Construction of a short CH-cavity with several massive BCP to study this effect Profiting projects: cw-linac, HE-linac2, MYRRHA Theorie: Simulationen: Experimentell: H. Podlech, IAP

LINAC AG • IAP • Goethe Universität Frankfurt Optimization of the Geometry of Superconducting CH-Cavities Cost, Construction Time, Fabrication Inaccuracies CH-Cavities are very complex sc RF Structures Expensive and long construction time Optimization of geometry without loosing performance Construction and test of a prototype cavity Profiting projects: cw-linac, HE-linac2, MYRRHA Theorie: Simulationen: Experimentell: H. Podlech, IAP

Development of cw rt operated CH-Cavities LINAC AG • IAP • Goethe Universität Frankfurt Development of cw rt operated CH-Cavities Room temperature CH-Cavities are promising RF structures for low and medium energy beams Suitable for cw operation because of excellent cooling capabilities Development of CH-cavities with thermal load exceeding 50 kW/m Optimization of cooling Investigation of thermal effects Profiting projects: cw-linac, FRANZ, MYRRHA Theorie: Simulationen: Experimentell: H. Podlech, IAP

LINAC AG • IAP • Goethe Universität Frankfurt Investigations on Different Surface Preparations and their Influence on the Maximum Achievable Fields in rt CH-type Cavities Different surface preparation methods will be compared with respect to the maximum fields in rt CH-type cavities at low duty cycle Copper surface without copper plating, no preparation High pressure rinsing (HPR) Buffered Chemical Polishing and HPR Copper plating Development and test of a 325 MHz cavity with minimum electric peak fields Profiting projects: HE-Linac-2 Theorie: Simulationen: Experimentell: H. Podlech, IAP

Beam Dynamics Simulations of the sc cw Linac LINAC AG • IAP • Goethe Universität Frankfurt Beam Dynamics Simulations of the sc cw Linac The cw linac is based on sc CH-cavities at 217 MHz Beam Dynamics is based on EQUUS-concept Optimization of the linac lattice: beam quality, energy variability, number of cavities, cavity parameter Profiting projects: cw-linac Theorie: Simulationen: Experimentell: H. Podlech, IAP

Developments on cw operated RFQs LINAC AG • IAP • Goethe Universität Frankfurt Developments on cw operated RFQs Present limit of thermal load in 4-Rod RFQs is about 50 kW/m High thermal load can have an influence on the geometry with negative impact on beam dynamics Optimization of cooling with new technologies Development of high power prototypes with tests Profiting projects: cw-linac, FRANZ, MYRRHA Theorie: Simulationen: Experimentell: H. Podlech, IAP

RFQ Development for the FAIR p-Linac LINAC AG • IAP • Goethe Universität Frankfurt RFQ Development for the FAIR p-Linac FAIR p-Linac requires a 325 MHz 3 MeV RFQ Presently no decision on RF structure Different options are under investigation Main emphasis on: RF parameters, capital costs, technical risk Development and tests of prototypes Profiting projects: FAIR p-linac Theorie: Simulationen: Experimentell: H. Podlech, IAP