Mar 23 – 29, 2015
Marriott Georgetown Hotel
US/Eastern timezone
See you in Rome next year! Note down April 11-15, 2016

Scaling behavior of circular colliders

Mar 25, 2015, 2:35 PM
ROOM A (Marriott Georgetown Hotel)


Marriott Georgetown Hotel


Richard Talman (Cornell)


The natural next future circular collider is an e+e- Higgs Factory and, after that, a post-LHC p,p collider in the same tunnel. For now the single most important parameter is the ring radius R, since all other parameters can be established later. Using only scaling laws to exptrapolate from existing colliders, this paper investigates ring circumferences two, or three, or four times greater than LEP's. The paper shows that "bigger is better", both for e+e- and (obviously) p,p. For a radiation dominated collider like the Higgs Factory, and arguably also for FCC-pp, the luminosity is shown to depend on R and the rf power P only through their product RP. This makes it possible for the same tunnel circumference to be optimal for both e+e- and p,p, without much increase in initial cost. For example, doubling R, compared to what might be marginally adequate for single Higgs production, and cutting P in half, say from 50 MW to 25 MW. The increase in start up cost associated with the increase in R is largely compensated by the decrease in cost associated with the reduction in P. This is especially true for yearly power costs. Other scaling laws are also derived, and their luminosity implications discussed.

Abstract title

Scaling Behavior of Circular Colliders Dominated by Synchrotron Radiation

Presentation materials