- Coordinator: Mamad Eshraqi (ESS, Sweden)
- Co-coordinator: Roger Ruber (University of Uppsala, Sweden)
- Team members:
- Sebastien Bousson (CNRS, FR)
- Hakan Danared (ESS, SE)
- Jean-Pierre Delahaye (CERN, CH)
- Tord Ekelof (Uppsala University, SE)
- Björn Galander (ESS, SE)
- Frank Gerigk (CERN, CH)
- Mats Lindroos (ESS, SE)
- Eric Montesinos (CERN, CH)
- Roger Ruber (Uppsala University, SE)
Providing a neutrino target requires the ESS linac, Figure 1, to be upgraded to deliver a total of 10 MW average beam power. The additional 5 MW of beam power has H⁻ as the accelerated species to enhance the injection into the accumulator ring using charge exchange injection scheme.
The main deliverable of this Work Package is the CDR chapters for the ESS linac modifications, including the cost and safety issues and, most importantly, the interactions with the generation of spallation neutrons which is the main purpose of the ESS. This WP will study the integration, installation and operation of an H– ion source, Figure 2, and the acceleration of H– in the linac to the higher energy of 2.5 GeV.
Increasing the linac energy to 2.5 GeV from the 2.0 GeV requires adding 8 additional cryomodules of the High beta type downstream of the high beta linac, Figure 3. Increases energy of the H- beam reduces the space charge tune shift in the
Amongst the items to be studied for the H⁻ beam transport, this work-package looks in particular on the effects of beam losses, and of the requirements on the RF power sources and the upgrade of the cooling system to handle the increase of the RF power of the linac by injecting and accelerating H– pulses between the ordinary H+ pulses, thereby increasing the pulse frequency to 28 Hz, Figure 4. 
European Unions’ Horizon 2020 : ESSnuSB has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 777419.The webpage reflects only the author’s view. The Commission is not responsible for any use that may be made of the information it contains.