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It is now well established that laser plasma acceleration (LPA) is aninnovative and good candidate in the beam acceleration field. Relativisticbeams are indeed produced up to several GeV but their quality remains to bedemonstrated in the highly demanding case of Free Electron Lasers (FELs).Several experiments already showed the feasibility of synchrotron radiationdelivery based on a LPA but free electron lasing has still to be achieved.Since the quality of the LPA beam inside the undulator is the critical issue,any LPA based FEL experiment requires a refined characterization of the beamproperties along the transport line and of the photon beam at the undulatorexit. This characterization relies on diagnostics which must be adapted to theLPA specificities. We will review the electron and photon diagnostics alreadyused on LPAs and required for LPA based FELs, and illustrate the criticalpoints using recent experiments performed around the world.

Electron and photon diagnostics for plasma acceleration based FELs