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.