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The properties of laser-accelerated ion bunches are demanding and requiredevelopment of suitable beam diagnostics. In particular, the short and intenseparticle bunches with a broad energy spectrum emitted in conjunction with astrong electromagnetic pulse (EMP) are challenging for conventional and wellestablished monitoring systems. An approach based on measuring the acousticsignals of particles depositing their energy in water, referred to asionoacoustics [https://doi.org/10.1118/1.4905047] was recently developed intoIon-Bunch Energy Acoustic Tracing (I-BEAT)\cite{haffa_i-beat:_2019}. I-BEATallows online detection of single proton bunches while being cost effective andEMP resistant. A simple water phantom equipped with only one ultrasoundtransducer positioned on the ion axis allows for reconstructing a rathercomplex energy spectrum that is typical for (manipulated) laser-accelerated ionbunches. To deduce the lateral bunch properties, additional transducers can beadded, for example perpendicular to the ion beam axis. This established setuphas been adapted for use closely behind the laser target and tested at thePHELIX laser at GSI. The capability of the system to retrieve information aboutthe broad proton spectrum close to the source despite the harsh conditions hasbeen demonstrated. Future improvements are required, most importantly theincrease of dynamic range. Nevertheless, I-BEAT holds promise to evolve into anonline diagnostic tool particularly suited for laser-driven source developmentand optimization at high repetition rates.

First Tests of the I-BEAT Detector as Primary Monitor for Target Normal Sheath Accelerated Protons