Abstract
Dielectric loaded structures are promising candidates for use in the structure wakefield acceleration (SWFA) technique, for both the collinear wakefield and the two-beam acceleration (CWA and TBA respectively) approaches, due to their low fabrication cost, low rf losses, and the potential to withstand high gradient. A short pulse (<=20 ns) TBA program is under development at the Argonne Wakefield Accelerator (AWA) facility where dielectric loaded structures are being used for both the power extractor/transfer structure (PETS) and the accelerator. In this study, an X-band 11.7 GHz dielectric PETS was developed and tested at the AWA facility to demonstrate high power wakefield generation. The PETS was driven by a train of eight electron bunches separated by 769.2 ps (9 times of the X-band rf period) in order to achieve coherent wakefield superposition. A total train charge of 360 nC was passed through the PETS structure to generate ~200 MW, ~3 ns flat-top rf pulses without rf breakdown. A future experiment is being planned to increase the generated rf power to approximately ~1 GW by optimizing the structure design and improving the drive beam quality.
Highlights
The advanced accelerator concepts (AAC) field conducts long-term research aimed at a future large-scale collider that will operate at substantially higher energy and lower cost than is possible with current accelerator technology [1,2,3]
In structure wakefield acceleration (SWFA), a high-charge drive beam traveling through a structure excites wakefields, which are used to accelerate a low-charge main beam, in either the same structure or a parallel structure [3]
Beam dynamics simulations with the general particle tracer (GPT) code [72] were conducted to understand the discrepancy between the measured rf power and the predicted value when pushing the power
Summary
The advanced accelerator concepts (AAC) field conducts long-term research aimed at a future large-scale collider that will operate at substantially higher energy and lower cost than is possible with current accelerator technology [1,2,3]. The independent structures provide more flexibility to optimize the deceleration and acceleration parameters [22] Both the mature design of the Compact Linear Collider (CLIC) [28] and the AAC straw-man design of the Argonne Flexible Linear Collider (AFLC) [19,22] are based on the TBA approach. We present the start-to-end development of an X-band 11.7 GHz dielectric-loaded power extractor This includes design optimization, simulation, fabrication, cold test, and high-power test. This work is an important step toward the realization of the short-pulse TBA-based future linear colliders as described in the AAC Roadmap [2] It provides useful experimental information on rf breakdown in the nanosecond regime.
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