Activities at the University of Frankfurt (IAP)

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1 Activities at the University of Frankfurt (IAP) Holger Podlech Ulrich Ratzinger Oliver Kester Institut für Angewandte Physik (IAP) Goethe-Universität Frankfurt am Main H. Podlech 1

2 Development of 325 MHz Ladder and 4-Rod RFQ 70 MeV p Linac Development for FAIR U. Ratzinger, H. Podlech IAP-GSI First coupled CH-cavity ready for copper plating, tests with 3 MW Klystron next year (U=13 MV) H. Podlech 2

3 The Frankfurt Neutron Source FRANZ The front-end down to RFQ injection is undergoing beam tests since summer All RF power amplifiers are installed. Cavities will be tested until summer 2014 U. Ratzinger, H. Podlech H. Podlech 3

4 17 MeV 176 MHz Injector for MYRRHA 4 ma Proton beam Cw operated High reliability Double Injector Final energy 600 MeV P=2.4 MW 30 kev 15MeV MeV 17 MeV 4-Rod-RFQ 5x rt CH 6x sc CH H. Podlech, M.Vossberg, Ch. Lenz, M. Basten, D. Mäder H. Podlech 4

5 cw Operated High Power 4-Rod RFQ Power level up to 70 kw/m, optimized cooling, prototype presently under test with 300 kw Amplifier H. H. Podlech Podlech, A. Schempp, M. Vossberg, Ch. Lenz 5

6 cw Operated rt CH-Cavities (FRANZ, MYRRHA, GSI cw Linac) Power level up to 40 kw/m H. Podlech, A. Seibel, D. Mäder, M. Schwarz H. Podlech 6

7 LINAC AG IAP Goethe Universität Frankfurt Superconducting CH-Cavities Test of the new 325 MHz sc CH-cavity ( =0.16) H. Podlech, M. Busch, M. Amberg, M.Basten, D. Mäder, F. Dziuba H. Podlech 7

8 CW Heavy Ion Linac Demonstrator at GSI Development and beam test of a 217 MHz sc CH-cavity at HLI/GSI IAP-HIM-GSI Tuner flange Helium vessel Preparation flange Inclined end stem Coupler flange Pickup flange Cold mass and space frame of new horizontal cryo module H. Podlech 8 H. Podlech, M. Busch, M. Amberg, M.Basten, F. Dziuba

9 Unilac Upgrade, High Field Cavity Development The GSI Unilac has to be improved and partly has to be rebuilt to fulfil the needs of an universal FAIR ion injector. - Optimization of the High Current Injector HSI - Optimization of the 1.4 AMeV stripper section - Rebuilt of the Alvarez section IAP-GSI IAP investigates achievable voltage gains by CH structures for the interesting velocity range Number of Gaps 7 Frequency (MHz) Voltage Gain (MV) 6 Eff. Accel. Length (mm) Eff. Accel. Field (MV/m) 11.2 PowerLoss oss (MW) 1.58 Q 0 value Effective Shunt impedance (MΩ/m) 57.3 Beam Aperture (mm) 27 U. Ratzinger H. Podlech 9

10 High Current Storage Ring IAP investigates longitudinal magnetic guiding field arrays similar to stellarator configurations (Figure 8 Configuration) for low energy high current beam rings. Beam experiments with two 30 deg, 0.6 T toroids are performed to test beam simulation tools. U. Ratzinger H. Podlech 10

11 Electron Target Ion electron interaction processes (cross sections measurements, ionization and recombination studies) Relevance for beam transport sections and ion sources Simple concept, no magnetic field, sheet beam animated beam technique Setup under evaluation at test beamline S. Geyer et al., A Transverse electron target for the investigation of electron-ion interaction processes, to be published in Physica Scripta S. Geyer et al., A Transverse Electron Sabrina Geyer Target for Heavy Ion Storage Rings, Proc. of IPAC 2013, Shanghai, China, MOPEA015 H. Podlech 11 Institute of applied physics (University of Frankfurt)

12 Dynamic Vacuum Equilibrium residual gas densities in the SIS100 calculated by StrahlSim: The effect of thermal transpiration has been added to the simulation. The simulated pressure and density in cold areas has significally decreased. (red: previous result, black: new result) Beam losses due to impact ionization of beam ions with rest gas atoms Low rest gas pressure and low desorption rate required Simulation with StrahlSim code Hydrogen pressure in SIS100 to high Cryo adsorption Experiment to determine the sticking coefficients and mean sojourn time on cryogenic surfaces. Simulation of the experiment in MolFlow: Gas particles (green) are traced until they stick to the cold surface (red). Their resulting density ratio is thereby linked to the sticking coefficient. Measurement setup in the lab StrahlSim update Frederic Chill Primary beams (GSI) Institute of applied physics (University of Frankfurt) H. Podlech 12

13 Beam Loss Monitors Beam losses in FAIR synchrotrons activation of machine components Response function for p known SPS Ionization chamber Heavy ions, different species Benchmarking: FLUKA and Geant4 simulation LHC Ionization chamber response function Real beam-loss experiment Definition of beam loss scenarios for simulation: SIS18, SIS100 V. Lavrik, Beam loss monitoring study at GSI available online on the web site presentation has been done for 2 nd FLUKA Advanced Course and Workshop. Vladimir Lavrik Beam diagnostics (GSI) Institute of applied physics (University of Frankfurt) H. Podlech 13

14 Single-Knob Beam Line for Transverse Emittance Partitioning Dr. Chen Xiao LINAC (GSI) Institute of applied physics (University of Frankfurt) The shape of the horizontal and vertical beta-function does depend on the solenoid field strength just between the solenoid entrance and the exit of the last skew quadrupole, i.e. along the part of the beam line where inter-plane coupling is non-zero. C.Xiao, O. K. Kester, L. Groening H. Leibrock, M. Maier, and P. Rottlander, Phys. Rev. ST Accel. Beams 16, (2013). H. Podlech 14

15 Scintillator Screen Studies Scintillator screens day zero diagnostics in beam transport lines (medium energies) Problems: Dynamic range, aging, material dependence of the measurements We are interested in the beam-flux and pulse length dependence of the light yield Application pepper-pot pot emittance meter E. Gütlich et al., "Scintillation screen studies for high dose ion beam applications, " IEEE Transactions on Nuclear Science, Vol. 59, No. 5, pp , October Dr. Eiko Gütlich Beam diagnostics (GSI) Institute of applied physics (University of Frankfurt) H. Podlech 15

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