Mechanical structure of SVD. Y.Yamada(KEK) at BELLE meeting on June 26 ’98. 1. Introduction 2. Prototype 3. Status and schedule. 1. Introduction. The SVD consists of three layers of DSSD ladders , forward and backward end rings made of Aluminum,
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Y.Yamada(KEK) at BELLE meeting on June 26 ’98
3. Status and schedule
We made prototypes of the ladders, end rings,
outer covers, support cylinders and beam pipe.
Prototype outer covers made by 0.5mmt CFRP.
Forward backward end rings
were machined on NC better
than 10 microns.
Water tubes glued on the end
rings. dT<2 degree C.
Al-N heat sink, heat pipes, spring and 5mm pin for backward.
Heat sinks fixed on the backward end ring by spring and pin.
Al-N heat sink, heat pipes, spring and 3mm pin for forward.
Heat sinks fixed on the forward end ring by spring and pin.
If we fix the ladder with sliding mechanism at forward side and push the ladder from backward side, sliding occurs around D=20 microns(or dT=10deg or f=7kgf).
The bowing of ladder is 10 microns at maximum with the ribs of BN (1mm thick and 7mm high).
We use weaker BN (0.5mm thick and 6.25mm high) and weaker spring than this test.
The bowing will be 15 microns at maximum
and small enough.
Prototype support system on CDC.
can be measured with an accuracy better than 10 microns.
The tool which divides the structure into two clam shells.
Real structures are under machining.
Real end ring under machining.
CFRP(E=160GPa) for real outer cover.
All components of the structure will be ready by end of July.