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Rowland, J.

Paper Title Page
TUPEC035 Design of the Recirculating Linac Option for the UK New Light Source 1799
 
  • P.H. Williams, D.J. Dunning, N. Thompson
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • D. Angal-Kalinin, J.K. Jones, P.H. Williams
    Cockcroft Institute, Warrington, Cheshire
  • R. Bartolini, I.P.S. Martin
    JAI, Oxford
  • J. Rowland
    Diamond, Oxfordshire
 
 

We present progress in the design of the recirculating linac option for the UK New Light Source. Improvements in all accelerator sections have been made such that the output meets the required specifications to drive the seeded NLS FELs. Full start-to-end simulations and tolerance studies are presented together with a comparison to the baseline, single pass linac design.

 
TUPD062 Nonlinear Single-particle Effects in Multiparticle Tracking Codes for the Analysis of Collective Instabilities 2069
 
  • J. Rowland, R.T. Fielder
    Diamond, Oxfordshire
  • R. Bartolini
    JAI, Oxford
  • R. Nagaoka
    SOLEIL, Gif-sur-Yvette
 
 

Within the common programme on the analysis of collective instabilities at Diamond and SOLEIL, the numerical codes mbtrack and sbtrack have been extended to include a full description of the nonlinearities in the storage rings by means of the nonlinear one-turn map. We present the details of the map implementation and the recent results on the analysis of the effects of the nonlinear terms of the map on the characteristics of the collective instabilities at the two machines.

 
WEPEA065 Beam Dynamics for the NLS Superconducting Linac 2633
 
  • R. Bartolini, C. Christou, J.H. Han, I.P.S. Martin, J. Rowland
    Diamond, Oxfordshire
  • D. Angal-Kalinin, D.J. Dunning, F. Jackson, B.D. Muratori, N. Thompson, P.H. Williams
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
 
 

We present the progress with the design of the 2.25 GeV superconducting linac for the NLS project. We discuss the performance achieved, the optimisation strategies, the relevance of microbunching instability and the analysis of the effect of various jitter sources

 
THPE037 Low Alpha Operation of the Diamond Storage Ring 4599
 
  • I.P.S. Martin, G. Rehm, J. Rowland, C.A. Thomas
    Diamond, Oxfordshire
  • R. Bartolini, I.P.S. Martin
    JAI, Oxford
 
 

The Diamond storage ring has been operated in low alpha mode providing short-pulse radiation for pump-probe experiments and coherent radiation for THz/IR measurements. Two lattices have been implemented, with both capable of providing a variable alpha in the range ±2x10-5, down to minimum values well below 1x10-6. The second lattice additionally provides a low emittance of 4nm.rad, compared to 35nm.rad for the first lattice. An overview of operation in low alpha mode is given, along with first measurements of coherent emission at long wavelengths under a variety of conditions.

 
THPE087 Calibration of the Nonlinear Accelerator Model at Diamond Storage Ring 4728
 
  • R. Bartolini, G. Rehm, J. Rowland
    Diamond, Oxfordshire
  • P. Kuske
    Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin
  • I.P.S. Martin
    JAI, Oxford
  • F. Schmidt
    CERN, Geneva
 
 

The correct implementation of the nonlinear ring model is crucial to achieve the top performance of a synchrotron light source. Several dynamics quantities can be used to compare the real machine with the model and eventually to correct the accelerator. Most of these methods are based on the analysis of turn-by-turn data of excited betatron oscillations. We present the experimental results of the campaign of measurements carried out at the Diamond. A combination of Frequency Map Analysis and resonant driving terms measurements has allowed a precise calibration of the nonlinear model capable of reproducing and then correcting the nonlinear beam dynamics in the storage ring.

 
THPE088 Beam Dynamics Effect of Insertion Devices at Diamond Storage Ring 4731
 
  • B. Singh, R.T. Fielder, J. Rowland
    Diamond, Oxfordshire
  • R. Bartolini, I.P.S. Martin
    JAI, Oxford
 
 

Diamond operates with 10 in-vacuum insertion devices at 5 mm gap, two Apple-II, two superconducting and two normal conducting wigglers. We report here the correction of the linear optics of wigglers and measurements of nonlinear effects such as dynamic aperture and frequency maps and their impacts on injection efficiency, lifetime and loss distribution in operation of the storage ring.