| Title |
Electron Bunch Self-modulation in Long Plasmas at SLAC FACET |
| Authors |
- P. Muggli
MPI, Muenchen, Germany
- E. Adli, V.K.B. Olsen
University of Oslo, Oslo, Norway
- L.D. Amorim
IST, Lisboa, Portugal
- S.J. Gessner, M.J. Hogan, S.Z. Li, M.D. Litos
SLAC, Menlo Park, California, USA
- C. Joshi, K.A. Marsh, W.B. Mori, N. Vafaei-Najafabadi
UCLA, Los Angeles, California, USA
- N.C. Lopes, J. Vieira
Instituto Superior Tecnico, Lisbon, Portugal
- O. Reimann
MPI-P, München, Germany
|
| Abstract |
We study the physics of self-modulation instability (SMI) of long, when compared to the wake wavelength, electron and positron bunches in pre-formed plasmas at SLAC-FACET. Self-modulation is the result of the action of focusing/defocusing transverse wakefields on the bunch radius. Self-modulation leads to observables such as overall defocusing of the bunch, periodic modulation of the bunch radius at the wake period and multi-GeV energy gain/loss by drive bunch particles. Defocusing is observed from OTR images, radial self-modulation from CTR spectra and interferometric traces and energy gain/loss from energy spectra with sub-GeV resolution. The plasma density is varied by changing the vapor density ionized by a laser/axicon system. The bunch length, radius and charge can also be varied. The SMI can be seeded using a notch collimator system. Numerical simulations indicate that seeding the SMI mitigates the hose instability. Hose instability can also be seeded, for example by using the RF deflecting cavity to impart a tilt to the incoming bunch axis. The overall experimental plan as well as the latest experimental results obtained with electron bunches will be presented.
|
| Funding |
This work performed in part under DOE Contract DE-AC02-76SF00515. |
| Paper |
download TUPME050.PDF [0.846 MB / 3 pages] |
| Export |
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| Conference |
IPAC2014, Dresden, Germany |
| Series |
International Particle Accelerator Conference (5th) |
| Proceedings |
Link to full IPAC2014 Proccedings |
| Session |
Poster Session, Messi Area |
| Date |
17-Jun-14 16:00–18:00 |
| Main Classification |
03 Particle Sources and Alternative Acceleration Techniques |
| Sub Classification |
A22 Plasma Wakefield Acceleration |
| Keywords |
plasma, wakefield, experiment, electron, radiation |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editors |
Christine Petit-Jean-Genaz (CERN, Geneva, Switzerland); Gianluigi Arduini (CERN, Geneva, Switzerland); Peter Michel (HZDR, Dresden, Germany); Volker RW Schaa (GSI, Darmstadt, Germany) |
| ISBN |
978-3-95450-132-8 |
| Published |
July 2014 |
| Copyright |
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