Author: Rehm, G.
Paper Title Page
MOIYB1
 Highlights of IBIC 2013  
 
  • G. Rehm
    DLS, Oxfordshire, United Kingdom
  
  An overview of the most interesting talks and posters presented at the IBIC2013, Oxford, England will be given. Where possible, references to further work published in the meantime on the same topic will be given.  
slides icon Slides MOIYB1 [12.669 MB]  
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TUCZB2 Measurements of Small Vertical Beamsize using a Coded Aperture at Diamond Light Source 279
 
  • C. Bloomer, G. Rehm
    DLS, Oxfordshire, United Kingdom
  • J.W. Flanagan
    KEK, Ibaraki, Japan
  
  Diamond Light Source produces a low emittance 3GeV electron beam which is now regularly operated at 8pm.rad vertical emittance. This corresponds to a vertical beamsize of just 13um in the dipole, which is at a high vertical beta location and routinely used for observing the synchrotron radiation using a pinhole camera. Deconvolution of the images from the pinhole camera to maximise resolution is limited by uncertainly regarding the precise shape of the pinhole, resulting in uncertainty on its computed point spread function. Recently a coded aperture has been installed which offers the potential to improve upon the traditional pinhole measurement by offering both higher resolution and increased flux seen through a larger total aperture, however, at the cost of significantly more complex analysis of the recorded images. A comparison of results obtained using the coded aperture and those achieved using the conventional pinhole is presented.  
slides icon Slides TUCZB2 [4.199 MB]  
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WEPF25 A Fast Quadrupole Magnet for Machine Studies at Diamond 605
 
  • A.F.D. Morgan, G. Rehm
    DLS, Oxfordshire, United Kingdom
  
  Fast quadrupolar magnets have been demonstrated in various schemes for increasing the coupled bunch instability thresholds, and for measuring the shift of transverse quadrupolar moment oscillation thus probing the transverse quadrupolar impedance. Due to machine upgrades, a ceramic vessel installed in the Diamond storage ring has become temporarily available for use. We decided to take advantage of this situation by designing and installing a simple air core quadrupole magnet which can operate at the fundamental quadrupolar frequencies (~212kHz for the horizontal and ~405kHz for the vertical plane). In the first instance we aim to use it to study the coupled bunch instability thresholds and quadrupolar tune shifts.  
poster icon Poster WEPF25 [1.359 MB]  
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WEPD24 New Features and Measurements using the Upgraded Transverse Multibunch Feedback at Diamond 696
 
  • G. Rehm, M.G. Abbott, A.F.D. Morgan
    DLS, Oxfordshire, United Kingdom
  
  A Transverse Multi-Bunch Feedback has been used in the Diamond Storage Ring for the stabilization of instabilities since 2007. Following a recent upgrade of the FPGA code and EPICS layer, a set of new features is now available to support operation and machine development: Firstly, a bunch by bunch choice of feedback filter allows for better stabilization of a single high charge bunch in a hybrid fill pattern. Secondly, complex grow-damp experiments are now possible using a sequencer of internal states allowing precise measurements of the damping rates on a mode by mode basis. Thirdly, a phase locked loop excitation and detection has been implemented to allow both extremely fast (kHz update rates) and extremely precise tracking of the betatron tune frequencies. Finally, short FIR filters on the ADC input and DAC output enable a fine tuning of the impulse response to provide maximum bunch to bunch isolation, as for instance required for efficient bunch cleaning.  
poster icon Poster WEPD24 [1.977 MB]  
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