| Paper | Title | Page |
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| THPRO103 | A Control System for the FRANZ Accelerator | 3134 |
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| The Frankfurt Neutron Source at the Stern- Gerlach Zentrum (FRANZ) is a multi-purpose facility for experiments related to accelerator development and nuclear astrophysics. A 200 mA proton beam will produce a neutron flux by use of the reaction 7Li(p, n)7Be. To study the reliability and performance of the accelerator an effective and powerful control system will be needed. A small ion source was used for the first performance test of the control system. The design of the control loop algorithm for the High Current proton source will be discussed. Physical data routinely taken by the control system are compared with manual measurements. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO103 | |
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| THPME014 | Beam Dynamics in the LEBT for FRANZ | 3241 |
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The two Low Energy Beam Transport (LEBT) sections of the accelerator-driven neutron source FRANZ* consist of four solenoids. The first section with two solenoids will match the 120 keV proton beam into a chopper system**. Downstream from the chopper system a second section with two more solenoids will match the beam into the acceptance of the following RFQ. The accelerator will be operated using either a 2 mA dc beam or a pulsed beam with intensities from 50 mA to 200 mA at 250 kHz repetition rate. The high intensity of these ion beams requires the consideration of space-charge effects. Particle simulations with varying parameter sets have been performed in order to determine the settings providing best transmission and beam quality. Loss profiles along the transport channel were computed to identify hotspots. Simulation results for best transmission at lowest emittance growth will be presented.
* O. Meusel et al., Proc. of LINAC12, Tel-Aviv, Israel, MO3A03 ** C. Wiesner et al., Proc. of IPAC2012, New Orleans, LA., USA, THPPP074 |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME014 | |
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| THPME015 | Experimental Performance of an E×B Chopper System | 3244 |
| SUSPSNE042 | use link to see paper's listing under its alternate paper code | |
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Beam operation of an E×B chopper system has started in the Low-Energy Beam Transport (LEBT) section of the accelerator-driven neutron source FRANZ*. The chopper is designed for low-energy high-perveance beams and high repetition rates. It combines a static magnetic deflection field with a pulsed electric compensation field in a Wien filter-type E×B configuration**. Helium ions with 14 keV energy were successfully chopped at the required repetition rate of 257 kHz. The maximum chopped beam intensity of 3.5 mA, limited by the given test ion source, corresponds to a generalized perveance of 2.7·10-3. For the design species and energy, 120 keV protons, this is equivalent to a beam current of 174 mA. Beam pulses with rise times of 120 ns, flat top lengths of 85 ns to 120 ns and Full Width at Half Maximum (FWHM) between 295 ns and 370 ns were experimentally achieved.
* U. Ratzinger et al., Proc. of IPAC2011, San Sebastián, Spain, WEPS040. ** C. Wiesner et al. Proc. of IPAC2012, New Orleans, LA., USA, THPPP074. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME015 | |
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |