Speaker
Description
In an Energy Recovery Linac (ERL), the beam, after acceleration and interaction, is recirculated and decelerated in the accelerating cavities of the linac. In such a scheme, the power of the beam is recovered within the SRF cavities, leading to substantial savings in electrical power. PERLE (Power Energy Recovery Linac for Experiments) is a high-power ERL demonstrator in Orsay, aiming to investigate multi-turn energy recovery. The electron beam can be recirculated in a superconducting linac up to 250 MeV (802 MHz).
The high intensity electron beam (20 mA) is created by a photoinjector comprising a DC gun, a RF buncher, a SRF booster (7 MeV) and a merging section. The gun aims to produce 500 pC bunches at 40 MHz to inject the ERL ring with photocathodes of bi-alkali material (CsKSb). The photocathodes are deposited in a preparation facility (PPF) consisting of a molecular beam epitaxy (MBE) chamber for growth, linked via transfer lines to a glove box for precursor preparation and to the gun vacuum chamber. With this unique system, photocathodes can be prepared and loaded into the gun chamber under excellent vacuum conditions. Green light at 515 nm is used to produce electron bunch from the photocathode. The gun will be operated at 350 kV using as insulating gas N2 instead of SF6, a potent greenhouse effect gas.
The photogun and its PPF, are installed at IJCLab- Orsay (France). The commissioning, currently underway, will be presented.
Funding Agency
This work received government funding managed by the Agence Nationale de la Recheche (ANR) in the France 2030 framework - reference ANR-24-RRII-0001
Footnotes
On behalf of the PERLE Collaboration
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