PERLE. Powerful energy recovery linac for experiments. Conceptual design report

Abstract

A conceptual design is presented of a novel energy-recovering linac (ERL) facility for the development and application of the energy recovery technique to linear electron accelerators in the multi-turn, large current and large energy regime. The main characteristics of the powerful energy recovery linac experiment facility (PERLE) are derived from the design of the Large Hadron electron Collider, an electron beam upgrade under study for the LHC, for which it would be the key 11 Author to whom any correspondence should be addressed.Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. demonstrator. PERLE is thus projected as a facility to investigate efficient, high current (HC) (>10 mA) ERL operation with three re-circulation passages through newly designed SCRF cavities, at 801.58 MHz frequency, and following deceleration over another three re-circulations. In its fully equipped configuration, PERLE provides an electron beam of approximately 1 GeV energy. A physics programme possibly associated with PERLE is sketched, consisting of high precision elastic electron-proton scattering experiments, as well as photo-nuclear reactions of unprecedented intensities with up to 30 MeV photon beam energy as may be obtained using Fabry-Perot cavities. The facility has further applications as a general technology test bed that can investigate and validate novel superconducting magnets (beam induced quench tests) and superconducting RF structures (structure tests with HC beams, beam loading and transients). Besides a chapter on operation aspects, the report contains detailed considerations on the choices for the SCRF structure, optics and lattice design, solutions for arc magnets, source and injector and on further essential components. A suitable configuration derived from the here presented design concept may next be moved forward to a technical design and possibly be built by an international collaboration which is being established.

Future deep inelastic scattering with the LHeC

“…When Guido Altarelli had asked, at the 2015 LHeC workshop, whether we could build the LHeC, the IAC, of which he was a very prominent member, discussed the importance of developing the basic technology of the LHeC. Since then a conceptual design report was published [6] of a low energy, energy recovery linac (ERL) facility. A collaboration has been founded with the intent to realise a "Powerful Energy Recovery Linac for Experiments" (PERLE) at the site of LAL Orsay where a hall and parts of the infrastructure already exist.…”

“…3). There follows a description of the LHeC accelerator design including an introduction to its planned testfacility [6] and a sketch of its detector concept (Sect. 4).…”

Future colliders - Linear and circular

“…Electron Recovery Linacs are operated at several research institutes around the world. A prototype for the ERL for LHeC is PERLE [24]. One of the main goals of PERLE is to achieve high currents of the order of 10 mA needed to reach the luminosity goal of O(10 34 cm −2 s −1 ) at a LHeC facility.…”

Lepton-trijet and displaced vertex searches for heavy neutrinos at future electron-proton colliders

“…An interesting way to improve the prospects for discovering heavy neutrinos at the LHC may be the Large Hadron electron Collider (LHeC) [9,10], envisioned to be operated simultaneously, and without interference with the hadron-hadron collisions, at ∼1.3 TeV centre-of-mass energy and could provide a total integrated luminosity of 1 ab −1 . It would provide valuable improvements to the PDF sets [11] and thus reduce the PDF-associated systematic uncertainties, and also significantly improve some of the Higgs measurements to the subpercent level [12,13]. First discussions of searches for heavy neutrinos at an LHeC-like collider include lepton number violating signatures [14][15][16], while ref.…”