Author: Bonnes, U.
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.
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.