| Paper | Title | Page |
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| MOPEA021 | Status of the HESR Electron Cooler Test Set-up | 115 |
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| For the proposed High Energy Storage Ring (HESR) at FAIR, it is foreseen to install an electron cooling device with a beam current of 3 A and a beam energy of 8 MeV. A test set-up was built at Helmholtz-Insitut Mainz (HIM) to conduct a feasibility study. One of the main goals of the test set-up is to evaluate the gun design proposed by TSL (Uppsala) with respect to vacuum handling, EM fields and the resulting beam parameters. Another purpose of the set-up is to achieve an energy recuperation efficiency of 1 - 10-5. To measure this quantity, a Wien filter has to be employed, which will also prove capable of mitigating collection losses. The current status of the project will be presented. | ||
| MOPEA022 | Beam Profile Measurement for High Intensity Electron Beams | 118 |
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| Recent developments in the field of high intensity electron beams in the regime below 10 MeV, e.g. energy recovery linacs or magnetized high energy electron coolers, have led to special demands on the beam diagnostics. Since commonly used diagnostic tools like synchrotron radiation and scintillation screens are ineffective or not able to withstand the beam power without being damaged, new methods are needed. Hence a beam profile measurement system based on beam induced fluorescence (BIF) was built. This quite simple system images the light generated by the interaction of the beam with the residual gas onto a PMT. A more elaborated system, the Thomson Laser Scanner (TLS) - the non-relativistic version of the Laser Wire Scanner - is proposed as a method for non-invasive measurement of all phase space components, especially in the injector and merger parts of an ERL. Both methods are implemented in a 100 keV photo gun. Beam profile measurements with BIF as well as first results of the TLS will be presented. | ||
| WEPWO005 | Microphonics Analysis of the SC 325 MHz CH-Cavity | 2319 |
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| Since the walls of superconducting (sc) cavities are kept very thin to support the cooling process, even small mechanical disturbances can detune the cavity. One of the main sources of detuning a cavity is microphonics. These low-frequent vibrations caused by vacuum pumps or underground noise are transferred to the cryostat and excite mechanical resonances of the cavity which may lead to frequency shifts larger than the bandwidth. To determine the mechanical resonance frequencies of the sc 325 MHz CH-cavity (Crossbar-H-Mode) simulations with ANSYS Workbench have been performed in a first step. Additionally, microphonics measurements were taken at room temperature as well as in a vertical cryostat at 4K in the cryo-lab of the IAP, Frankfurt University. Furthermore, the contraction of the cavity walls and the resulting frequency shift due to the cavity cool-down has been measured. A comparison between simulation results and the measured values is presented in this paper. | ||
| THPWO007 | Advanced Superconducting CW Heavy Ion Linac R&D | 3770 |
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| An advanced upgrade program has to be realized in the next years, such that enhanced primary beam intensities are available. For this a new sc 28 GHz full performance ECR ion source has to be established. Via a new low energy beam line an already installed new RFQ and an IH-DTL will provide for cw-heavy ion beams with high average beam intensity. It is foreseen to build a new cw-heavy ion-linac behind this high charge state injector. In preparation an advanced R&D program is defined: The first linac section comprising a sc CH-cavity embedded by two sc solenoids (financed by HIM and partly by HGF-ARD-initiative) as a demonstrator will be tested in 2014). After successfull testing an advanced cryomodule comprising up to 4 rf cavities is foreseen. First layout scenarios of this advanced test bench will be presented. | ||
| THPWO016 | Superconducting CH Cavities for Heavy Ion Acceleration | 3794 |
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Funding: Work supported by HIM, GSI and BMBF Contr. No. 06FY7102 To demonstrate the operation ability of superconducting (sc) Crossbar-H-mode (CH) cavity technology a 217 MHz structure of this type is under development at the Institute for Applied Physics (IAP) of Frankfurt University. The cavity has 15 accelerating cells and a design beta of 0.059. It will be equipped with all necessary auxiliaries like a 10 kW power coupler and a tuning system. Currently, the cavity is under construction. Furthermore, this cavity will serve as demonstrator for a sc continuous wave (cw) LINAC at GSI. The proposed cw LINAC is highly requested to fulfil the requirements of nuclear chemistry and especially for a competitive production of new Super Heavy Elements (SHE) in the future. A full performance test by injecting and accelerating a beam from the GSI High Charge Injector (HLI) is planned in 2014. The current status of the sc CH cavity and the demonstrator project is presented. |
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| MOPEA022 | Beam Profile Measurement for High Intensity Electron Beams | 118 |
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| Recent developments in the field of high intensity electron beams in the regime below 10 MeV, e.g. energy recovery linacs or magnetized high energy electron coolers, have led to special demands on the beam diagnostics. Since commonly used diagnostic tools like synchrotron radiation and scintillation screens are ineffective or not able to withstand the beam power without being damaged, new methods are needed. Hence a beam profile measurement system based on beam induced fluorescence (BIF) was built. This quite simple system images the light generated by the interaction of the beam with the residual gas onto a PMT. A more elaborated system, the Thomson Laser Scanner (TLS) - the non-relativistic version of the Laser Wire Scanner - is proposed as a method for non-invasive measurement of all phase space components, especially in the injector and merger parts of an ERL. Both methods are implemented in a 100 keV photo gun. Beam profile measurements with BIF as well as first results of the TLS will be presented. | ||
| TUPWO014 | Downscaling the Energy of the MAMI-B Cascade Towards 100 MeV | 1910 |
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Funding: Work supported by DFG (CRC 443/1044) and the German federal state of Rheinland-Pfalz New experiments could benefit from energies of ~100 MeV, significantly lower than 180 MeV which is the lowest energy routinely available with the microtron cascade of MAMI-B. This article describes the difficulties which arise due to the drastically reduced injection energy of the first microtron (RTM-1) and presents the results of the beam tests which have been performed. We suggest a new beam extraction system from RTM-2 which will avoid these problems. |
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| WEPWA011 | Injector Linac for the MESA Facility | 2150 |
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Funding: Work supported by the German Federal Ministery of Education and Research (BMBF) and German Research Foundation (DFG) under the Cluster of Excellence "PRISMA" In this paper we present several possible configurations of an injector linac for the upcoming Mainz Energy-recovering Superconducting Accelerator (MESA)* and discuss their suitability for the project. *R. Heine, K. Aulenbacher, R. Eichhorn "MESA - Sketch of An Energy Recovery Linac For Nuclear Physics Experiments At Mainz" IPAC 12, New Orleans, USA, 2012, p.1993, TUPR073 |
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| WEPWO005 | Microphonics Analysis of the SC 325 MHz CH-Cavity | 2319 |
|
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| Since the walls of superconducting (sc) cavities are kept very thin to support the cooling process, even small mechanical disturbances can detune the cavity. One of the main sources of detuning a cavity is microphonics. These low-frequent vibrations caused by vacuum pumps or underground noise are transferred to the cryostat and excite mechanical resonances of the cavity which may lead to frequency shifts larger than the bandwidth. To determine the mechanical resonance frequencies of the sc 325 MHz CH-cavity (Crossbar-H-Mode) simulations with ANSYS Workbench have been performed in a first step. Additionally, microphonics measurements were taken at room temperature as well as in a vertical cryostat at 4K in the cryo-lab of the IAP, Frankfurt University. Furthermore, the contraction of the cavity walls and the resulting frequency shift due to the cavity cool-down has been measured. A comparison between simulation results and the measured values is presented in this paper. | ||
| THPWO016 | Superconducting CH Cavities for Heavy Ion Acceleration | 3794 |
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Funding: Work supported by HIM, GSI and BMBF Contr. No. 06FY7102 To demonstrate the operation ability of superconducting (sc) Crossbar-H-mode (CH) cavity technology a 217 MHz structure of this type is under development at the Institute for Applied Physics (IAP) of Frankfurt University. The cavity has 15 accelerating cells and a design beta of 0.059. It will be equipped with all necessary auxiliaries like a 10 kW power coupler and a tuning system. Currently, the cavity is under construction. Furthermore, this cavity will serve as demonstrator for a sc continuous wave (cw) LINAC at GSI. The proposed cw LINAC is highly requested to fulfil the requirements of nuclear chemistry and especially for a competitive production of new Super Heavy Elements (SHE) in the future. A full performance test by injecting and accelerating a beam from the GSI High Charge Injector (HLI) is planned in 2014. The current status of the sc CH cavity and the demonstrator project is presented. |
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