Prospect for an high energy
factory at LNF
P. Raimondi
LNF Apr-10,2008
The LNF has been studying an higher
energy factory since several years.
We have developed several schemes:
Adiabatic upgrade of Dafne by replacng
the main dipoles. This is the cheapest
solution but allows just for a maximum
energy of about 2.2GeV/CM. In addition
the “on energy injection” cannot be easily
implemented. The peak and integrated
luminosity are strongly affected by the
need of ramping the Main Rings
It is definitely more efficient to design a
new machine altogheter. The LNF has
been working on this design for quite a
while. “DANAE” is an adjustable energy
factory with a maximum energy around
3GeV/CM. This machine has been
constrained to fit in the Dafne hall, this
limits henceforth its maximum energy and
ultimate luminosity performances.
- The INFN in collaboration with SLAC,
KEK, ORSAY has been also working on a
SuperB factory machine.
- Its main parameters are:
e- energy 7GeV
e+ energy 4GeV
Luminosity 2e36
Ring circumference 1.6Km
Wall plug power 30MW
The design is based on large Piwinsky
angle and very small beams at the IP
I have been asked by the workshop committee to
see if the SuperB design and concepts could be
scaled to a lower energy machine, this can be
done considering that:
The ultimate luminosity scales down linearly with
energy and has to be scaled from the lowenergy ring
The ring circumference sclaes down more than
linearly with energy and has to be scaled from
the high energy ring
The Wall plug power has two contributions:
one slales down lineraly with the CM energy and
the second scales rougly with the ring
circumference
A rescaling of the SuperB design to a
lower energy gives rougly the following
parameters:
e- energy 2GeV
e+ energy 2GeV
Luminosity 1e36
Ring circumference 260m
Wall plug power 12MW
The machine has to be designed to
operate at lower energies, at least a factor
2, with a linear scaling of its luminosity
Such machine does not fit in the Adone
hall. In order to reuse the present
infrastructures and injection complex, it
can be build just behind Adone and use
the present KLOE pit as collider hall.
The injection complex has to be upgraded
also, for example by boosting the beam
energy after the dafne accumulator with a
1.5GeV S-band or L-band Linac before
injecting into the main rings
SuperB Lattice
SuperB half Final Focus
High Energy factory lattice
High Energy half Final focus
Conclusions
Provided that we convince ourselves that
the Large Piwinsky Angle is suitable for
high luminosity, it seems possible to build
a relatively cheap (100-150ME) high
energy machine in the LNF,although we
believe that the ultimate machine would be
the SuperB that however has to be hosted
in the TorVergata University Campus