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Delerue, N.

Paper Title Page
MOPE076 Longitudinal Bunch Profile Diagnostics in the 50-femtoseconds Range using Coherent Smith-Purcell Radiation 1155
 
  • N. Delerue, G. Doucas, E. Maclean, A. Reichold
    JAI, Oxford
  
 

We report on the possible utilisation of Smith-Purcell radiation to measure the longitudinal profile of 50-femtoseconds electron bunches. This length is typical for the bunches currently produced by Laser Wakefield Acceleration and is at the limit of what is achievable by alternative techniques, such as Electro-Optic sampling.

  
MOPE077 Observation of a H- Beam at the CERN Linac 4 Test Stand using a Pepper-pot 1158
 
  • N. Delerue, P. Jackson
    JAI, Oxford
  • O. Midttun, R. Scrivens, E. Tsesmelis
    CERN, Geneva
  
 

Pepper-pot based transverse emittance measurement has the advantage of providing a fast (single shot) measurement with a relatively simple hardware. We report on Pepper-pot based transverse emittance measurements made at the CERN Linac 4 test stand.

  
MOPE078 Transverse Emittance Measurement at High Energy using Long Pepper-pot 1161
 
  • N. Delerue
    JAI, Oxford
  
 

Although the pepper-pot method has been used for decades at low energy to measure the transverse emittance of particles sources, it has only been extended to high energy very recently. We report on some of the recent measurements done at high energy (several hundred MeVs) and discuss the practical consideration of such measurements. We show demonstrate that an extended pepper-pot does not significantly affect the phase space of the beam and thus provides a valid transverse emittance measurement.

  
MOPE080 Single Shot Emittance Measurement from Beam Size Measurement in a Drift Section 1167
 
  • C.A. Thomas, G. Rehm
    Diamond, Oxfordshire
  • S.I. Bajlekov
    University of Oxford, Clarendon Laboratory, Oxford
  • R. Bartolini, N. Delerue
    JAI, Oxford
  
 

Single shot emittance measurement is essential to assess the performance of new generation light sources such as linac based X-ray FELs or laser plasma wakefield accelerators. To this aim, we have developed a single shot emittance measurement using at least 3 screens inserted in the beam at the same time, measuring the beam size at different positions in a drift space in one shot. We present here test measurements performed at Diamond in the transfer line from the Booster to the Storage Ring, using thin OTR and also YAG screens. We also compare these measurements with results from the more conventional quadrupole scan method and also measurements using an OTR screen and an assembly of two cameras imaging the beam size and the beam divergence at a point near the waist of the beam. The validity and limits of the new method are discussed in the paper.