Abstracts Brochure - CERN

MOPLS115
MOPLS116
MOPLS117
26-Jun-06 16:00 - 18:00 MOPLS — Poster Session
design, PARMELA simulations showed that the technical specifications are fulfilled. The vacuum issue has been also
carefully investigated, and NEG (Non Evaporated Getter) technology has been adopted in order to reach the 10 -10
mbar pressure inside the structure.
A Spin Rotator for the ILC
A spin rotator featuring an optic axis with
P.O. Schmid, N.J. Walker (DESY)
straight vision is presented. This rotator utilizes
three bends, two solenoid pairs and two
correction devices. These correctors, named reflectors, are mandatory for removing the cross plane coupling introduced
by the solenoids. It is shown how the solenoids have to be set up to achieve longitudinal IP polarization
taking into account non-zero crossing angles at the interaction region and a linac following the curvature of the earth.
Furthermore, the stability requirements for mechanical and electrical imperfections are analyzed.
Status Report on the Harmonic Double-sided Microtron of MAMI C
A. Jankowiak, K. Aulenbacher, O. Chubarov, M. Dehn, H. Euteneuer,
F.F. Fichtner, F. Hagenbuck, R.H. Herr, P. Jennewein, K.-H.
Kaiser, W.K. Klag, H.J. Kreidel, U.L. Ludwig-Mertin, J.R. Röthgen,
S.S. Schumann, G.S. Stephan, V. Tioukine (IKP)
140
The Mainz Mikrotron MAMI is a cascade of
three racetrack microtrons, delivering since
1991 a high quality 855MeV, 100muA cw electron
beam for nuclear and radiation physics
experiments. An energy upgrade of this machine
to 1.5GeV by adding a Harmonic Dou-
ble-Sided Microtron (HDSM)* as a fourth stage is well under way. Here we give a review of the experiences gained
during fabrication and testing of the main components of the HDSM and report the status of its construction. Initial
operation of the machine is expected for the first half of 2006. After a period of commissioning in diagnostic pulse
mode with low beam power (10ns, high intensity bunch trains with a repetition rate of max. 10kHz), soon the first
nuclear physics experiments will be started.
*A. Jankowiak et al. "Design and Status of the 1.5 GeV-Harmonic Double Sided Microtron for MAMI", Proceedings
EPAC2002, Paris, p. 1085.
Tuning Algorithms for the ILC Beam Delivery System
Emittance preservation is an important as-
J.K. Jones (CCLRC/DL/ASTeC)
pect in the design and running of the International
Linear Collider (ILC) with a direct
consequence on the luminosity of the machine. The Beam Delivery System represents a major problem in this respect
as it produces emittance dilution effects that are difficult to correct and that have a direct effect on the emittance as
seen at the interaction point, and thus upon the luminosity of the machine. Tuning algorithms for this section of the
machine rely on the correction of aberrations through the use of linear and higher order knobs, using corrections
magnets distributed throughout the system. Alternative systems are also discussed. The design and implementation
of these tuning algorithms, and their effectiveness in a variety of cases, are investigated and estimates made for
tolerances on a variety of error sources. Simulations results are also presented for models of the ATF-2 accelerator
under development at KEK, with comparisons made to the ILC design.