SMuK 2023 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 11: RF and SRF Research

AKBP 11.1: Talk

Wednesday, March 22, 2023, 17:30–17:45, CHE/0184

Thin Films On HOM Antennas To Push The Limits For Higher Beam Currents at MESA(*)(**) — •Paul Plattner, Florian Hug, and Timo Stengler — Institut für Kernphysik (KPH), Mainz, Deutschland

The Mainz Energy-Recovering Superconducting Accelerator (MESA), an energy-recovering (ER) LINAC, is currently under construction at the Institute for Nuclear physics at the Johannes Gutenberg-Universität Mainz, Germany. In the ER mode continues wave (CW) beam is accelerated from 5 MeV up to 105 MeV. The energy gain of the beam is provided through 2 enhanced ELBE-type cryomodules containing two 1.3 GHz 9-cell TESLA cavities each. By pushing the limits of the beam current up to 10 mA, a quench can occur at the HOM Antennas. This is caused by an extensive power deposition within the antenna. Calculations have shown that a power transfer of 1 W must be assumed. To prevent a quench of the HOM antennas by high beam currents without mayor modification of the design, it is necessary to find suitable materials. Nb3Sn and NbTiN can be applied as a coating to the antennas and have higher critical parameters than Nb which provides than a higher power limit. As a further approach to improve the power transfer by changing to material from the antenna to OFHC Copper. The limit of the coated antennas will be tested with the cavities of a cryomodule from the decommissioned ALICE from STFC Daresbury. (*)The authors acknowledge the transfer of one cryomodule to Mainz by the STFC Daresbury. (**)The work received funding by BMBF through 05H21UMRB1.