RF Fingers for the New ESRF-EBS Storage Ring

Thierry Brochard (1) , Philipp Brumund (1) , Loys Goirand (1) , J. Pasquaud (1) , Simon White (1)

1 ESRF - European Synchrotron Radiation Facility

In the new ESRF-EBS (Extremely Brilliant Source) storage ring vacuum chambers assembly, with a reduced aperture and the new omega shape, RF fingers are a key component to ensure good vacuum conditions and reach the best possible machine performance. As a result, dedicated efforts were put into producing a more compact more robust more reliable and easier to assemble RF finger design for the new machine. The work was done in parallel on the beam coupling impedance reduction, which have a direct impact on the electron beam lifetime, and on the mechanical aspect with FEA validation and geometry optimization. Many test have been made, in a mechanical laboratory, including high resolution 3D computed tomography images in order to measure the electrical contact, and also in the existing ESRF storage ring with the electron beam, to validate the final design before launching the series production

Mots clés: vacuum; SRF; impedance; coupling; storage-ring

Domaines: Physique des accélérateurs [physics.acc-ph]

Thierry Brochard, Philipp Brumund, Loys Goirand, J. Pasquaud, Simon White. RF Fingers for the New ESRF-EBS Storage Ring. 10th Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation, Jun 2018, Paris, France. pp.TUOPMA07, ⟨10.18429/JACoW-MEDSI2018-TUOPMA07⟩. ⟨hal-01965433⟩