Author: Eichhorn, R.
Paper Title Page
MOPPR014 Installation and Test of a Beam Loss Monitor System for the S-DALINAC 804
  • R. Stegmann, U. Bonnes, C. Burandt, R. Eichhorn, F. Hug, L.E. Jürgensen, N. Pietralla
    TU Darmstadt, Darmstadt, Germany
  • D. Proft
    ELSA, Bonn, Germany
  Funding: This work is supported by the DFG through SFB 634.
The superconducting Darmstadt linear accelarator S-DALINAC is designed for accelerating electrons up to energies of 130 MeV for measurements in nuclear physics at small momentum transfers. For the purpose of machine protection and in order to increase reliability and efficiency an efficient tool for on-line measurements of beam losses down to electron energies of 1 MeV is desirable. Therefore a system of beam-loss monitors has been developed, installed, and tested. The system consists of commercially availiable PIN-diods and newly developed electronics. Implementation in the S-DALINAC's control system is done via EPICS IOC. We will report on the setup of the beam-loss monitoring system and on its initial performance in first tests.
TUPPC006 CW Energy Upgrade of the Superconducting Electron Accelerator S-DALINAC 1161
  • M. Kleinmann, J. Conrad, R. Eichhorn, F. Hug, N. Pietralla
    TU Darmstadt, Darmstadt, Germany
  Funding: This work is supported by the DFG through SFB 634.
The S-DALINAC is a superconducting recirculating electron accelerator with maximum design energy of 130 MeV operating in cw at 3 GHz. Even so the gradients of the superconducting cavities are well above design, their design quality factor of 3*109 have not been reached so far. Due to the limited cooling power of the cryo-plant being 120 W, the final energy achievable in cw operation is around 85 MeV, currently. In order to provide a cw beam with the designed final energy in the future, the installation of an additional recirculation path is projected and to be finished by 2013. We review the design constraints related to the existing beam lines, report in detail on the magnet design (being the key issue) and the lattice calculations for the additional recirculation path.
TUPPR073 MESA - Sketch of an Energy Recovery Linac for Nuclear Physics Experiments at Mainz 1993
  • R.G. Heine, K. Aulenbacher
    IKP, Mainz, Germany
  • R. Eichhorn
    TU Darmstadt, Darmstadt, Germany
  We present the concept of a small superconducting CW accelerator with multi-turn energy recovery. This machine, the Mainz energy recovering superconducting accelerator (MESA), is intended to serve for particle physics experiments in the energy range 100-200MeV.  
WEPPC003 Component Qualification and Final Assembly of the S-DALINAC Injector Upgrade Module 2206
  • J. Conrad, R. Eichhorn, T. Kürzeder, A. Richter, S.T. Sievers
    TU Darmstadt, Darmstadt, Germany
  Funding: This work is supported by the DFG through SFB 634.
The injector of the S-DALINAC delivers currently electron beams of up to 10 MeV with a current of up to 60 μA. With the new cryostat-module an increase of both parameters, energies ranging to 14 MeV and currents up to 150 μA, are expected. For acceleration, the module houses two 20 cell elliptical niobium cavities which are used at a frequency of 3 GHz in liquid helium at 2 K. The RF power is delivered to the cavities through the different temperature stages by a WR-284 transition line which is connected to the resonator by a new waveguide-to-coax power coupler (being one of the major changes compared to the design of the existing module). We review on the design of the module and present the results of the first cool-down. Also, a report on additional new design features, e.g. piezo actuators for tuning at 2 K, and the production of the cavities will be given.
THPPC075 Development of a Digital Low-level RF Control System for the p-Linac Test Stand at FAIR 3461
  • M. Konrad, U. Bonnes, C. Burandt, R. Eichhorn, J. Enders, P.N. Nonn, N. Pietralla
    TU Darmstadt, Darmstadt, Germany
  Funding: Work supported by DFG through CRC 634 and by the BMBF under 06 DA 9024 I
A test stand for a proton Linac is currently built at GSI in the context of the FAIR project. Its low-level RF control system will be based on a system that has been developed for the S-DALINAC at TU Darmstadt operating at 3 GHz. This system converts the RF signal coming from the cavity down to the base band using a hardware I/Q demodulator. The base-band signals are digitized by ADCs and fed into an FPGA. A custom CPU implemented in the FPGA executes the control algorithm. The resulting signals are I/Q modulated before they are sent back to the cavity. The RF module has to be adapted to the p-LINAC's operating frequency of 325 MHz. Moreover, the p-LINAC will run in pulsed operation whereas the S-DALINAC is operated in CW mode. Different quality factors of the cavities and the pulsed operation require a redesign of the control algorithm. We will report on the modifications necessary to adapt the S-DALINAC's control system to the p-LINAC test stand and on first results obtained from tests with a prototype.