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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

(2)

70 MeV p – Linac Development for FAIR

70 MeV p – Linac Development for FAIR

U. Ratzinger, H. Podlech

Development of 325 MHz

Development of 325 MHz

Ladder and 4-Rod RFQ

IAP-GSI

First coupled CH-cavity ready for copper plating, tests

with 3 MW Klystron next year (U=13 MV)

(3)

The Frankfurt Neutron Source FRANZ

The Frankfurt Neutron Source FRANZ

The front-end down to RFQ – injection is undergoing beam tests since summer 2013.

All RF power amplifiers are installed. Cavities will be tested until summer 2014

H. Podlech

(4)

17 MeV 176 MHz Injector for MYRRHA

17 MeV 176 MHz Injector for MYRRHA

• 4 mA Proton beam

• Cw operated

• High reliability

• High reliability

• Double Injector

Fi l

600 M V

• Final energy 600 MeV

• P=2.4 MW

30 keV 1 5 MeV 3.7 MeV 17 MeV

30 keV 1.5 MeV

4-Rod-RFQ

5x rt CH

6x sc CH

(5)

cw Operated High Power 4-Rod RFQ

cw Operated High Power 4-Rod RFQ

Power level up to 70 kW/m, optimized cooling, prototype presently under test

with 300 kW Amplifier

with 300 kW Amplifier

(6)

cw Operated rt CH-Cavities (FRANZ MYRRHA GSI cw Linac)

cw Operated rt CH-Cavities (FRANZ, MYRRHA, GSI cw Linac)

Power level up to 40 kW/m

Power level up to 40 kW/m

(7)

Superconducting CH-Cavities

Superconducting CH-Cavities

Test of the new 325 MHz sc CH-cavity (

=0.16)

H. Podlech

(8)

CW Heavy Ion Linac Demonstrator at GSI

CW Heavy Ion Linac Demonstrator at GSI

Development and beam test of a 217 MHz sc CH-cavity at HLI/GSI

Helium vessel Tuner flange

IAP-HIM-GSI

Helium vessel Preparation flange Inclined d t g

Coupler flange Pickup flange end stem

Cold mass and space frame of new

horizontal cryo module

(9)

Unilac – Upgrade, High Field Cavity Development

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

of an universal FAIR ion injector.

- Optimization of the High Current Injector HSI

- Optimization of the 1.4 AMeV stripper section

p

pp

IAP-GSI

- Rebuilt of the Alvarez – section

IAP investigates achievable voltage gains by CH – structures for the interesting

velocity range

Number of Gaps

7

Frequency (MHz)

325.2

Voltage Gain (MV)

6

Eff Accel Length (mm)

529 6

Eff. Accel. Length (mm)

529.6

Eff. Accel. Field (MV/m)

11.2

Power Loss (MW)

o e

oss (

)

1.58

.58

Q

0

– value

13500

Effective Shunt impedance (M

Ω

/m)

57.3

H. Podlech

Beam Aperture (mm)

27

(10)

High Current Storage Ring

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

high current beam rings. Beam experiments with two 30 deg, 0.6 T toroids are

performed to test beam simulation tools.

U Ratzinger

U. Ratzinger

(11)

Electron Target

 Ion electron interaction processes (cross sections

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

 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

H. Podlech

y

Target for Heavy Ion Storage Rings”,

Proc. of IPAC 2013, Shanghai, China, MOPEA015

y

Institute of applied physics (University of Frankfurt)

(12)

Dynamic Vacuum

Dynamic Vacuum

 Beam losses due to impact ionization of

Equilibrium residual gas p

beam ions with rest gas atoms

 Low rest gas pressure and low desorption

q g

densities in the SIS100 calculated by StrahlSim: The effect of thermal transpiration has been

rate required

 Simulation with StrahlSim code

 Hydrogen pressure in SIS100

added to the simulation. The simulated pressure and density in cold areas has significally

 Hydrogen pressure in SIS100 to high  Cryo adsorption

decreased. (red: previous result, black: new result)

Experiment to determine the sticking coefficients

d j ti

and mean sojourn time on cryogenic surfaces.

 StrahlSim update

Frederic Chill

Primary beams (GSI)

Institute of applied physics

p

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 Measurement setup in

(University of Frankfurt)

g y y

the sticking coefficient.

p the lab

(13)

Beam Loss Monitors

Beam Loss Monitors

 Beam losses in FAIR synchrotrons

 activation of machine components

 Response function for p known  SPS Ionization

 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 Definition of beam loss scenarios for simulation: SIS18, SIS100

Vladimir Lavrik

Beam diagnostics (GSI)

Institute of applied physics

V. Lavrik, “Beam loss monitoring study at GSI” available online on the web site www.fluka.org, presentation has been done for 2ndFLUKA Advanced Course and Workshop.

H. Podlech

Institute of applied physics (University of Frankfurt)

(14)

Single-Knob Beam Line for Transverse Emittance Partitioning

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

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

C.Xiao, O. K. Kester, L. Groening H. Leibrock, M. Maier, and P. Rottlander, Phys. Rev. ST

g

p

p

p g

non-zero.

, , g , , , y

(15)

Scintillator Screen Studies

Scintillator Screen Studies

 Scintillator screens

 day zero diagnostics in beam transport lines (medium energies)

lines (medium energies)

 Problems: Dynamic range, aging, material dependence of the measurements

dependence of the measurements

 We are interested in the beam-flux and pulse length dependence of the light yield

Application  pepper pot emittance meter Application  pepper-pot emittance meter

Dr. Eiko Gütlich

Beam diagnostics (GSI)

E. Gütlich et al., "Scintillation screen studies for high dose ion beam applications, " IEEE

T i N l S i V l 59 N 5

H. Podlech

g ( )

Institute of applied physics (University of Frankfurt)

Transactions on Nuclear Science, Vol. 59, No. 5, pp. 2354 - 2359, October 2012.

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