American activities on photon colliders (second WWWpage)
Photon Collider Working
Group
WG activity (after TESLA TDR)
Workshop and miniworkshops
- First Workshop (of Extended ECFA-DESY study), Krakow, Poland, 14-18 September, 2001
-
Gamma-gamma mini-workshop, Zeuthen, 13 Dec 2001
- Gamma-gamma physics meeting, CERN, 17 Dec 2001
(program)
(transperancies)
- Second ECFA-DESY
Workshop of Extended ECFA/DESY study, Saint Malo, France, 12-15 April, 2002
-
International Workshop on Linear Colliders August 26-30, 2002 Jeju
Island, Korea (Session I)
-
Third ECFA-DESY Workshop, Prague, Czech Repulic, 15-18 November 2002
-
Forth ECFA-DESY Workshop, Amsterdam, Netherlands, 1-4 April 2003
-
First ECFA Workshop, Montpellier, France, 13-16 November 2003
(22.10.2001)
Realistic luminosity distributions at TESLA Photon Colliders.
User's guide, comments, data
Introduction
Principles of Photon Colliders
The basic scheme of the Photon Collider is shown below. Two
electron beams of energy E_0 after the final focus system travel
towards the interaction point (IP) and at a distance b of about 1-5 mm
from the IP collide with the focused laser beam. After scattering,
the photons have an energy close to that of the initial electrons and
follow their direction to the interaction point (IP) (with small
additional angular spread of the order of mc^2/E_0 < 10^{-6} -
10^{-5}, where they collide with a similar opposite high energy
photons or electrons. Using a laser with a flash energy of several
Joules one can ``convert'' almost all electrons to high energy
photons. The photon spot size at the IP will be almost equal to that
of the electrons at the IP and therefore the luminosity of
gamma-gamma, gamma-electron collisions will be similar to the
``geometric'' luminosity of the basic e+e- beams (positrons are not
necessary for photon colliders). To avoid background from the
disrupted beams, a crab crossing scheme is used, Fig. b with the crab
crossing angle about 30 mrad. In this case final particles do not hit
focusing quadrupoles.
Properties of photon beams: spectrum, polarization, e+e- pairs and
nonlinear effects in conversion region
Physics: gold-plated processes
Cross sections for some processes in gamma-gamma, gamma-e collisions
Parameters of the Photon Collider at TESLA
Luminosity spectra in gamma-gamma and gamma-electron collisions at TESLA
Some slides:
1) V.Telnov. Photon
Coillider at TESLA (review of the TDR),
talk at 2nd Int.Workshop on High Energy Photon Colliders, FNAL,
March 13-17, 2001
2) V.Telnov. The Interaction Region
for gg, ge collsions
at linear colliders, talk at INSTR02 (Feb.2002), NIM A 494 (2002) 35
Last updated by V. Telnov
on 22-July-2004
