1. 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: 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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