1. Expression of Interest for future flagship projects
in Accelerators
P2IO International Scientific Council – 24 Nov. 2017

2. On the accelerator research area, 3 EOI expressed
EOI on Accelerators
On the accelerator research area, 3 EOI expressed
« A laser-plasma accelerator for P2IO » - ALP
LAL, IRFU, LLR+ potentially other P2IO laboratories
« e-IPHI : extension of IPHI accelerator for a prototype of a compact thermal neutron source»
IRFU + potentially other P2IO laboratories
« PERLE : a multi-turn, high intensity Energy Recovery Linac (ERL) demonstrator »
LAL, IPNO + potentially other P2IO laboratories

3. Laser-plasma acceleration
Question: could laser-plasma acceleration produce high quality beams for high energy physics ?
Laser – plasma acceleration : one of the most promising development for particle acceleration for some applications
Excellent local context and environment: 3 P2IO groups are working in this domain, and more in the paris-saclay perimeter,
and 3 projects/installations:
* Equipex CILEX: Apollon laser (10 PW) and long
focal length area
* ESCULAP R&D program in the valley
* European project EUPRAXIA.

4. Laser-plasma acceleration
Main goals:
Enhance the collaboration between the 3 groups to develop all required skills to achieve experiments on laser-plasma acceleration
Develop mass simulations tools required for simulation of laser plasma acceleration, based on upcoming exascale computing capabilities
Moyen: étudier et de réaliser, une installation plasma auprès du laser APOLLON de CILEX, orientée vers la thématique de l'accélération laser- plasma, avec toute l'instrumentation associée du plasma et du faisceau d’électrons.
How ?
Study and develop a dedicated laser-plasma acceleration experimental facility close to the Apolon laser, equipped with all plasma and electron beam instrumentation

5. E-IPHI : towards a compact neutron source
e-IPHI : extension of the IPHI accelerator in order to build a demonstrator of a compact source for thermal neutrons
General context of research reactor being closed in EU : need for alternative solution such as compact neutron source (CANS) based on accelerators.
Roadmap:
Feasibility (proton on Be target) studied and performed on IPHI.
Final objective: SONATE project (p of 20 to 30 MeV, peak current of 100 mA, pulsed 6%), neutrons lines
Goal : achieve the e-IPHI phase: extension of the actual IPHI bunker, additional beam line length, additional beam instruments, add neutron measurement and characterization capabilities, perform tests and experiments.

6. PERLE: a unique demonstartor of ERL capabilities
New accelerator concept: Energy Recovery Linac (ERL)
D. Bilderback
Deceleration of a bunch of particle in a cavity give the required energy to accelerate another bunch in the same cavity, at the same time, but with a 180° dephasing.
Very compact scheme, reduced cost (RF sources at lower power) and compatible with very high currents
Demonstrators worldwide are being constructed démonstrateurs Cornell; BerlinPro) based on this concept, but with limited ambition (single turn, P~virtual ~1 MW)
ERLs are desirable because they provide
(nearly) linac quality/brightness beam at (nearly) storage ring beam powers:
Pbeam>>PRF
beam quality source limited: ebeam < ering equilibrium
high power beam with reduced RF drive  cost savings!
radiation control: beam is dumped at low energy
can mitigate intractable (i.e. expensive) environmental/safety concerns

7. PERLE: a unique demonstartor of ERL capabilities
Projet Orsay
A demonstrator of an electron ERL
400 MeV, 15 mA (Pvirtuel ~10 MW)
Include 3 recirculating arc
2 superconducting linacs
The unique ERL project cumulating high cirrent, multi-turn
A collaboration is being set with CERN, JLAB, Daresbury, Novosibirsk, University of Liverpool…
Evolution of ERL performance can be characterized by increases in
full-energy beam power
multiplication factor
dynamic range Efull/Edump
Present state of art (for “true” ERLs – those with multiplication factor >1):
Pbeam ~ 1.25 MW
Pbeam/PRF ~ 10
Efull/Edump ~ 10
PERLE calls a factor of 10 increase in each of these, and is thus a natural step towards LHeC (100x and beyond…)