Dresden 2026 – scientific programme
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 11: Plasma Accelerators, Diagnostics II
AKBP 11.2: Talk
Wednesday, March 11, 2026, 16:45–17:00, SCH/A117
Active mirror cooling concept for high average power, high peak power Ti:Sapphire laser amplifiers — •Anneli Dick1,2, Juan B. Gonzalez-Diaz1, Thomas Hülsenbusch1, Leonie Jaworski1, Lutz Winkelmann1, Andreas R. Maier1, and Guido Palmer1 — 1Deutsches Elektronen Synchrotron DESY, Hamburg, Germany — 2University of Hamburg, Hamburg, Germany
Advancing laser plasma accelerators from a few-hertz repetition rate to the kHz-regime is essential for unlocking next-generation applications, including free-electron lasers and direct synchrotron injection. Moreover, a high-repetition rate enables direct active stabilization of crucial laser parameters which will support sub-percent energy spread from the plasma accelerator. For efficient electron acceleration, 100 TW-level laser pulses are required, which are commonly generated by chirped pulse Ti:Sapphire amplifier systems. The Kaldera laser system at DESY is being developed to drive such a high-repetition-rate plasma accelerator. It is currently providing J-level energies at 100 Hz repetition rate. However, one major challenge of power scaling this material is the thermal load generated at high repetition rates and pump energies due to its high quantum defect. To control the resulting thermal effects more efficiently, new cooling concepts are required. Theoretical investigations on cryogenically cooled active mirror amplifiers have shown they can be a promising method to achieve this. The presented work evaluates this approach experimentally with respect to further power scaling of the Kaldera laser towards the multi-100 W range.
Keywords: Laser plasma acceleration; Ultrafast high peak power lasers; Ti:Sapphire laser amplifier; Cryogenically cooled disk amplifier; Thermal load management