[FFA_CEBAF_Collab] Accelerators for Electroweak Physics and Higgs Boson Studies

[Jay Benesch]

Colleagues,

I bring this to your attention for the chart on page 6 of the pdf, 
"Concept Maturity Definition".  It seems to me that the FFA is at Design 
Maturity 2: End to end preliminary design concept under development with 
ongoing R&D to address fundamental technical issues.  It also seems to 
me that reaching Design Maturity 4 in criteria #1 and Maturity 3 in 
criteria #2 (R&D) is a worthy goal for end-FY23. Given the SC septum 
requirement I don't see an advance beyond Maturity 3 in R&D without 
funding for a partnership with one of the SC or NSF labs with SC magnet 
capability.  YMMV.

Jay

https://arxiv.org/abs/2209.05827

Accelerators for Electroweak Physics and Higgs Boson Studies
A. Faus-Golfe, G.H. Hoffstaetter, Q. Qin, F. Zimmermann

     We discuss the goals, the designs, the state of technical 
readiness, and the critical R&D needs of the accelerators that are 
currently under discussion as Higgs and electroweak factories. We also 
address the respective staging options enabling future energy-frontier 
colliders. The accelerators covered are based on many different 
techniques and approaches. They include several circular colliders, 
various linear colliders, colliders based on energy recovery linacs 
(ERLs), ERL-ring combinations, as well as gamma-gamma colliders. The 
linear colliders proposed consist of options for the International 
Linear Collider (ILC), for the Compact Linear Collider (CLIC), for the 
Cold Copper Collider (C^3), and for the more recent Higgs-Energy Lepton 
Collider (HELEN). ERLs are key components of the Recycling Linear e+e- 
Collider (ReLiC), of the Energy Recovery Linear Collider (ERLC), and of 
the Circular Energy Recovery Collider (CERC). Among the more 
conventional ring colliders, the following proposals are featured: the 
Future Circular Collider (FCC-ee), the Circular Electron Positron 
Collider (CEPC), the Electron Positron Circular Collider at Fermilab 
(EPCCF), and the Large Electron Positron collider $\#$3 (LEP-3). In 
addition, we consider the X-ray FEL based gamma-gamma Collider Higgs 
Factory (XCC) and the High-Energy High-Luminosity gamma-gamma collider 
(HE&HL gamma-gamma). Finally, a Higgs factory based on a circular muon 
collider is mentioned for completeness.