Abstract
We discuss the progress in the R program for a future upgrade of the European XFEL facility, namely for an operation in the continuous wave (cw) and long pulse (lp) modes, which will allow for significantly more flexibility in the electron and photon beam time structure. Results of cw/lp runs with preseries XFEL cryomodules and status of components needed for the new operation modes are presented here.
Highlights
The European XFEL superconducting linac is based on cavities and cryomodules (CM) developed for the TESLA linear collider
We discuss the progress in the R&D program for a future upgrade of the European XFEL facility, namely for an operation in the continuous wave and long pulse modes, which will allow for significantly more flexibility in the electron and photon beam time structure
The capacity for the upgraded plant is by 50% higher than the expected heat load of the XFEL accelerator and it is similar to that of the existing CEBAF cryogenic refrigerator at JLab
Summary
The European XFEL superconducting linac is based on cavities and cryomodules (CM) developed for the TESLA linear collider. While many experiments can take advantage of full bunch trains, others desire an increased intrapulse distance between bunches to several μs or short bursts with a kHz repetition rate For these experiments, the high average brilliance can be preserved only when the duty factor (DF) is much larger than that for the nominal sp operation. We should note here that in the upgrade scenario for new operation modes, which is later discussed in more detail, the ML has an additional 12 standard XFEL CMs, relocated from the injector section (IS). In this scenario, all 17 CMs in linacs L0, L1 and L2 will be replaced with new ones capable to operate in cw mode at gradients up to 15 MV=m. 3320 5430 40700 been assumed for all cryogenic strings in the ML to avoid a wavy flow of helium
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