Workshop on Beam-Beam Effects in Large Hadron Colliders
The beam-beam interaction can limit the ultimate
performance of hadron
colliders, since the associated tune footprint has to be accommodated
in a small region of the working diagram free from high-order betatron
resonances. Both the nearly head-on collisions and the parasitic
encounters contribute to the footprint, and both contributions must be
kept under control. To minimize the effect of parasitic encounters,
the design of future large hadron colliders with many bunches includes
collisions with a crossing angle and suitable separation schemes; even
a few long-range collisions, however, eventually couple all
circulating bunches. The study of beam-beam effects is therefore
particularly important for the design and operation of such future
machines and special care will be needed to avoid luminosity
degradation caused by emittance growth, bunch-by-bunch orbit
distortions and possible loss of stability for some coherent beam-beam
modes.
Where: CERN
When: 12-16 April 1999
This workshop was devoted to:
Review of current knowledge and past experience on the weak-strong
and strong-strong beam-beam interaction in hadron colliders.
Discussion of ongoing studies and planning of future research
work (analytic approaches and beam-beam simulations)
with special emphasis on the
LHC.
Discussion and planning of beam-beam machine experiments
at existing and future hadron accelerators
(SPS, Tevatron, HERA, RHIC, etc.).
Local Organizing Committee:
J. Gareyte, W. Herr, E. Keil, F. Ruggiero
PROCEEDINGS are now available.
They were edited by:
F. Zimmermann and J. Poole
Working Groups:
list of questions addressed
1. Incoherent or Weak-Strong Beam-Beam Effects
(Chairman: E. Keil).
Digitized slides.
2. Coherent or Strong-Strong Beam-Beam Effects
(Chairman: K. Yokoya).
Digitized slides.
Workshop schedule: see
CERN map
Sunday 11 April: 16:00-19:00 Registration
(Room B)
Monday 12 April: 08:00-09:00 Registration
(Room B)
Opening Session
(Council Chamber):
Digitized slides.
09:00-09:30 Introductory remarks, L. Evans
09:30-10:10 Past experience with beam-beam effects in the SPS, K. Cornelis
10:10-10:40 --- Coffee break ---
10:40-11:30 Tevatron: past beam-beam experience and plans for Run II, P. Bagley
11:30-12:10 Past and recent experience with beam-beam effects in HERA, T. Limberg
-----------
Lunch
-----------
14:00-14:40 Beam-beam experience in LEP relevant to the LHC, W. Herr
14:40-15:20 Recent beam-beam experience with many bunches in PEP-II, M. Minty
15:20-15:50 --- Coffee break ---
15:50-16:40 Beam-beam effects in RHIC and the VLHC, S. Peggs
16:40-17:20 Beam-beam design criteria for the LHC, J. Gareyte
Tuesday 13 April:
09:00-16:00 Working groups
(Room C and
Room B)
Joint Session
(Council Chamber)
16:00-16:30 Beam-Beam Compensation at Fermilab; R&D Status, A. Sery
16:30-17:30 Discussion
Wednesday 14 April:
09:00-16:00 Working groups
(Room A and
Room B)
16:00-17:30 Joint Session
(Council Chamber)
Thursday 15 April:
09:00-12:00 Working groups
(Room A and
Room B)
free afternoon
19:30-23:00 Workshop Banquet
Friday 16 April: 09:00-12:00 Summary Session and final discussion
(TH Auditorium)
All the meeting rooms, with the exception of the
TH Auditorium
(Building 4, room 3-006), are located in the CERN
Main Building:
Council Chamber (Building 503, room 1-001),
Room A (Building 61, room 1-017),
Room B (Building 61, room 1-009) and
Room C (Building 60, room 6-015).
Contact:
F. Ruggiero
Last modified: 26 April 1999
