Minutes of the CLIC Meeting - 5 May 2006
Agenda:
|
A study on Production of Bimetallic Raw
Materials
for the CLIC Accelerating Structures,
Status Report |
Speaker:
|
Gonzalo Arnau Izquierdo |
Abstract
The need for high
accelerating gradients for the future Compact Linear Collider (CLIC)
imposes considerable constraints on the materials of the accelerating
structures that are peculiar to the high electric field regions and to
the high magnetic field regions. The tips of the irises, where
electric field is maximum, are prone to break down and field emission
resulting in modification of the cavity shape. The cavity surfaces,
where magnetic field is maximum, are submitted to cyclic thermal
stresses induced by high pulsed RF currents possibly resulting in
surface damage by fatigue.
Pure copper has shown its limitations to cope with those constrains.
Structures with regions made of two different materials have been
proposed where the tips of the irises will be of pure molybdenum (or an
alternative refractory alloy) and the main walls of the cavities will
be of CuZr alloy UNS C15000 (or an alternative copper alloy with the
best matching of electrical conductivity and fatigue resistance
properties). Such structures have to be manufactured from bi-metallic
raw materials that are not commercially available. A suitable way of
producing Mo-CuZr semi products compatible with the manufacturing and
operation of structures has to be developed and assessed.
In this talk different possibilities of obtaining bi-metallic raw
materials for manufacturing of structures will be presented, together
with the characterization of prototypes obtained by four different
ways. In particular the results of the characterization of the two more
promising bimetals obtained to date will be presented: HIP (High
Isostatic Pressure) diffusion bonding and explosion bonding techniques
will be compared in terms of their limitations and perspectives.
copy of Gonzalo's
transparencies (pdf
format)
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Frank
Tecker - Last updated 15-05-2006