Abstracts Brochure - CERN

TUPCH — Poster Session 27-Jun-06 16:00 - 18:00
IOTs: The Next Generation RF Power Sources for Accelerators
A new generation of Inductive Output Tubes
(IOT) have been developed with a focus Y. Li, H.P. Bohlen, R.N. Tornoe, E.L. Wright (CPI)
on cost reduction, robustness, stability, enhanced
power, improved gain and efficiency. As demonstrated with our L-band integral cavity IOT, a new family of
IOTs can operate as CW or pulse amplifiers with up to 80 kW CW and 120 kW peak output power. Switching between
the CW and pulse mode is easy and simple. In this paper, we will present our new compact designs and the latest
performance data.
Pressure Field Distribution in a Race-track Microtron Beam Transport Line
This work presents analytical and numerical
results for the pressure field distribution
along the transport line of a racetrack microtron,
considering both the steady state out-
F.T. Degasperi (FATEC-SP) M.N. Martins (USP/LAL) L.L. Verardi
(EPUSP)
gassing of the walls and transient and localized gas bursts. The gas transport, in the molecular regime, is considered
a diffusive phenomenon. Mathematical and physical formulations are given and detailed; specific conductance and
specific throughput are defined; in addition, a detailed discussion about the boundary conditions is presented. We
will present results for a gas burst occurring either in one of the tubes or in one of the recirculating magnets’ vacuum
chamber. This approach is applied to realistic conditions, such as diameter and length of the tubes, dimensions of the
vacuum chamber and the outgassing rate and throughput of the gas source induced by a certain amount of radiation
hitting the walls. This can be considered as a gas source localised in position and in time. We analyze the steady
state and the transient cases, and, in particular, the effect of the gas reaching the vacuum chamber and affecting all
the recirculating tubes.
Pressure Profile and its Gradient Field Distribution in a Vacuum Chamber of a Synchrotron
Light Source
This work presents analytical and numerical
results for the pressure field distribution and
its gradient along the vacuum chamber of a
synchrotron light source. The gas transport
F.T. Degasperi (FATEC-SP) M.J. Ferreira (LNLS) M. O. Pauletti
(EPUSP)
in the molecular regime is considered a diffusive phenomenon. Mathematical and physical formulations are given
and detailed, in special, specific conductance and specific throughput are defined in modeling in two dimensions.
In addition, a detailed discussion about the boundary conditions is presented, taking account both the steady state
outgassing of the walls and transient and localized gas bursts. We will present results for a gas burst occurring in the
vacuum system. This approach is applied to realistic conditions, such as general dimensions of vacuum system with
typical values of outgassing rate and throughput of the gas source induced by a certain amount of radiation hitting
the walls. This can be considered as a gas source localized in position and in time. We analyze the steady state and
the transient cases, and, in particular, the effect of the gas reaching the light source vacuum chamber and affecting all
parts of the vacuum system in study.
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