Long Bo FT and Flanges

April 12, 2012 talk

Hans Jostlein

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Requested Design Changes from 4/4/2012

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Based on Comments and Requirements from the April 4 presentation:

1.Increase the distance between HV Feed and TPC

1.Increase the distance between central purity monitor and TPC / HV feed

2.Raise the HV FT flange above the insulation atop the big 33 ½”) flange

to diminish icing danger

Implementation of new Design Requirements

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Move the TPC away from the Tank Center.This frees up radial space for the purity monitor and

the HV Feed

Raise the TPC to the same elevation as the central purity monitor,

maintaining the same minimum LAr depth.

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Additional Design Features: Bubbles

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Analyze bubble paths and Bubble Size Control

Add a tight fitting seal at the bottom of the PE sleeve. It will sea when cold

Conical bottom end of the PE sleeve to prevent bubble aggregation

Venting of the space surrounding the 7/8” center tube to its inside

Venting the 7/8 tube inside through tiny holes in the contact cup at the bottom. Hole size 0.2 mm requires 2 cm LAr head; we will use 0.5 mm or larger.

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Additional Design Features: Purging

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Purge the space surrounding the PE sleeve into the GAr space at the top.

Purge the GAr space near the top into an external purge line

Purge the GAr space near the TPC Signal Feedthrough into an external purge line

New Feedthrough DesignNew Features:

1.Top Flange raised above the top insulation2.Bubble stop insert at bottom of PE Sleeve (See later slide)3.Inverted cup/ spring contact arrangement (see later slide)4.Extended to great depth to avoid having an insulated support5.Bubble and purge management (see later slide)

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Additional Design Features: HV Contact Area

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In order to minimize the TPC assembly diameter, thus maximizing the stand-off distances of HV FT and Purity monitor,

We invert the usual arrangement:

The spring loaded finger is attached to the TPC cathode HV tubing, while the (inverted) cup is welded to the HV FT center tube.

This change turns out useful and effective for bubble control (see previous slide)

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Additional Design Features: Windows

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We will have two windows, both existing:

An 8” CF window and a 6” CF window.These will help during HV FT installation

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Making the Long Bo High Voltage Fedthrough

Cutting grooves into the PE:

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Making the Long Bo High Voltage Fedthrough

Cutting grooves into the PE:

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Making the Long Bo High Voltage Fedthrough

Cutting grooves into the PE:

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