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Traber, T.

Paper Title Page
WEPMN012 Beam Loading Compensation Using Real Time Bunch Charge Information from a Toroid Monitor at FLASH 2074
  • E. Vogel, C. Gerth, W. Koprek, F. Loehl, D. Noelle, H. Schlarb, T. Traber
    DESY, Hamburg
  Funding: Deutsches Elektronen-Synchrotron - DESY

At pulsed linear accelerators, fast proportional rf control compensates beam loading sufficiently for single or a few bunches. In the case of long bunch trains, additional measures have to be taken commonly by adding a compensation signal to the rf drive signals calculated from the predicted beam intensity. In contrast to predictive methods, techniques based on real time beam measurements are sensitive to fast changes of the beam intensity and bunch patterns. At FLASH we apply a beam loading compensation scheme based on toroid monitor signals. This paper presents the compensation scheme, the calibration procedure and the effect on the beam.

FRPMN017 Beam Position Monitor Calibration at the FLASH Linac at DESY 3937
  • N. Baboi, P. Castro, O. Hensler, J. Lund-Nielsen, D. Noelle, L. M. Petrosyan, E. Prat, T. Traber
    DESY, Hamburg
  • M. Krasilnikov, W. Riesch
    DESY Zeuthen, Zeuthen
  In the FLASH (Free electron LASer in Hamburg) facility at DESY more than 60 beam position monitors (BPM) with single bunch resolution are currently installed, and more are planned for future installation. Their calibration has been initially made by measuring each electronics board in the RF laboratory. However the ultimate calibration of each monitor is made by measuring its response to beam movement. This is a time-consuming procedure depending on the availability and accuracy of other components of the machine such as corrector magnets. On the other hand it has the advantage of getting in one measurement the answer of the monitor with all its components and of being independent of the monitor type. The calibration procedure and particularities for various types of BPMs in various parts of the linac will be discussed. A procedure based on the response matrices is also now under study. This would significantly speed up the calibration procedure, which is particularly important in larger accelerators such as the European XFEL (X-ray Free Electron Laser), to be built at DESY.