Superconducting radio frequency linear collider HELEN

Abstract

This article discusses a proposed Higgs-Energy LEptoN (HELEN) e + e - linear collider based on advanced traveling wave superconducting radio frequency technology. The proposed collider offers cost and AC power savings, smaller footprint (relative to the ILC), and could be built at Fermilab. After the initial physics run at 250 GeV, the collider could be upgraded either to higher luminosity or to higher, up to 500 GeV, energies.

Future high energy colliders and options for the U.S.

“…• linear colliders based on high gradient SRF (in the accelerating gradient range of 50 MV/m to 90 MV/m; standing wave or travelling wave structures). A center of mass energy reach between 250 and 500 GeV with the facility's central campus within the Fermilab site is possible [36],…”

“…Since the ILC SRF linac parameters were baselined in 2013 [40,43], the community has made advances in further developing the technology. Three possible paths have been identified that could lead to a more compact SRF linear collider, the Higgs-Energy LEptoN (HELEN) collider [36,65]. The options are listed here in the order of their maturity:…”

“…The baseline luminosity of HELEN would be similar to that of the ILC, i.e., 1.35×10 34 cm −2 s −1 at 250 GeV and 1.8× 10 34 cm −2 s −1 at 500 GeV. The R&D program and a demonstrator test facility that would be needed to realize such a collider are described in subsequent sections and in [36,65]. As HELEN collider in many ways is similar to ILC, its luminosity can be upgraded using approaches developed for ILC.…”