argontube detector design laffranchi marco, meregaglia anselmo, messina marcello, rubbia andre’...
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ArgontubeDetector design
Laffranchi Marco, Meregaglia Anselmo,
Messina Marcello, Rubbia Andre’
Bern, 07.03.2006
Dewar
638
0m
m1600mm X 1600mm
Picture taken at the ETH Zurich
Dewar
250mm
349mm
561
5m
m
540
0m
m
The LAr vessel has an inner volume of about 265L.
Dewar with the LAr vessel inserted contains about 262L.
Cut design of the Dewar
In red is the inner vessel, in green is the dewar.
If we want to extract the inner vessel vertically, we need at least 12m space.
Global view
CF250 Flange (without feedthroughs)
3 x PE Pillars
LEM
Field shaping rings(10mm spaced)
Greinacher chain
500mm
Global view
Pillars, Rings and Greinacher.
Cathode (not shown)
PMT(Electron tube 9357)
100mm
25mm
Drif
t=44
73m
m
Dewar Top View
Dewar (D=349mm inside)
CF250 Flange (D=305mm)
LAr vessel (D=250mm)
Field shaper rings (D=120mm x 3mm)10mm spaced
62mm
Greinacher capacitors
45mm
120mm
Grooves for the HV and PMT signal cables.
LEM+Rings
The LEM has a sensitive diameter of 120mm and it is composed of 97 squared pixels of 10mm x 10mm.
The pillars have a diameter of 40mm with slits every 10mm. The ring can be fixed by a PE bar screwed on the pillar.
The Greinacher has to be mounted as far as possible from the ground. The diodes and connections are not shown.
The field shaping rings are placed every 10mm. I.e. 450 rings in total. They can be of stainless steel or copper.
Outline
•A first design of the detector for the Argontube has been presented.
•The LEM, pillars, field shaping rings, Greinacher chain and PMT has been designed.
•LEM:D=120mm made of 97 pixels (10mm x 10mm).
•Field shaping rings: 450 rings spaced 10mm. 120mm inner diameter, 3mm thick.
•Greinacher chain: it has to be as small as possible in the radial direction.
•PMT: a single big tube has been designed.
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