# Presentation: 375930

## Wire and Cathode Planes- Current Concept (work in progress)

**PPD Internal Review – 2****nd**** Part**
- April 19th, 2005
- Rafael Silva

_**FLARE**_
- Fermilab Liquid Argon Experiments

## Overview

- (Model by Chuck Grimm)

- 6 Wire Sectors, each containing 6 Wire Planes

- 7 Cathode
- Planes

- Trusses
- (schematic)

- Inner
- Tank

- _Active volume_
- Diameter: 40m
- Height: 30m

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Slide 3

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Slide 4

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Detector

6 signal wire sectors, each containing  6 wire planes

7 cathode planes, and

field shaping tubes in between them.

- 6 signal wire sectors, each containing  6 wire planes
- 7 cathode planes, and
- field shaping tubes in between them.

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Wire plane sectors

6 wire planes in each sector:

				+30°		induction
1⁄2 chamber 	-30°		induction
				vertical	collection

				vertical	collection
1⁄2 chamber  	-30°		induction
				+30°		induction

- 6 wire planes in each sector:
- 				+30°		induction
- 1⁄2 chamber 	-30°		induction
- 				vertical	collection
- 				vertical	collection
- 1⁄2 chamber  	-30°		induction
- 				+30°		induction

- {

- {

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Read out wires

- Units: meters

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Some wire sector numbers:

Wire diameter 			= 150 m
Spacing between wires 	= 5 mm () 
Spacing between planes 	= 5 mm
Maximum wire length 		= 38 m
Total amount of wires 		= 302,000
Read-out wires 			= 223,000 
Total amount of wire		= 6,800 km

- Wire diameter 			= 150 m
- Spacing between wires 	= 5 mm (****)
- Spacing between planes 	= 5 mm
- Maximum wire length 		= 38 m
- Total amount of wires 		= 302,000
- Read-out wires 			= 223,000
- Total amount of wire		= 6,800 km

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## General wire plane requirements:

- Robust, long life system, minimizing wire rupture possibility and consequences
- Wire position variations should occur smoothly and uniformly
- Laid out to provide short read-out cables
- Unobtrusive size and packaging
- Safe and time/cost efficient assembly
- Withstand tensioning and cooldown, including effects from the tank

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## 
“Effects from the tank”

Roof truss max. vertical deflection: 
With own weight: 			- 2 cm
At max. capacity (900 kg/m):	-16 cm
Add internal pressure (10 kPa):	+ 8 cm

At Liquid Ar temperature (in equilibrium):
No change in truss vertical deflection
Radial contraction of tank: 	  5 cm

**“**_**Effects from the tank**_**”**
- Roof truss max. vertical deflection:
- With own weight: 			- 2 cm
- At max. capacity (900 kg/m):	-16 cm
- Add internal pressure (10 kPa):	+ 8 cm
- At Liquid Ar temperature (in equilibrium):
- No change in truss vertical deflection
- Radial contraction of tank: 	  5 cm

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Some wire numbers: 

Tensioning weight 		= 1.3 kg
Max. elongation  			= 14 cm
Max. thermal contraction 	= 14 cm
Max. stereo wire sag 		= 2 cm

- Tensioning weight 		= 1.3 kg
- Max. elongation  			= 14 cm
- Max. thermal contraction 	= 14 cm
- Max. stereo wire sag 		= 2 cm

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Slide 12

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Wire Tensioning

Top end is connected to a G-10 board and the other end is connected to a weight 
Pulleys are staggered and pre-assembled in groups to panels to be located by rails attached to the tank
Prototype required

- Top end is connected to a G-10 board and the other end is connected to a weight
- Pulleys are staggered and pre-assembled in groups to panels to be located by rails attached to the tank
- Prototype required

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Pulleys on side wall 

- Model by
- Chuck
- Grimm
- Wire by
- Petros
- Rapidis!

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Wire spacers

- Placed every 3 m or less, prevent broken wires from touching cathode planes
- Make wire spacing uniform
- Relax requirements on wire tension uniformity
- Stabilize wires electrically
- Reduce areas affected by shorts in case of breakages

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## 
Wire Material

Same kind as used by Icarus 
Good candidate: vacuum re-melted (for internal defects) austenitic (304, 302) stainless steel, C.W. to 2 GPa tensile strength, 100% eddy-current tested (for external defects)
Load tested, including after installation
Cost is relatively low (~ 100 k$ total)

_**Wire Material**_
- Same kind as used by Icarus
- Good candidate: vacuum re-melted (for internal defects) austenitic (304, 302) stainless steel, C.W. to 2 GPa tensile strength, 100% eddy-current tested (for external defects)
- Load tested, including after installation
- Cost is relatively low (~ 100 k$ total)

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## 
Wire holding method

Wires have looped ends, in the same fashion utilized by Icarus: wrapping the wire around itself.

_**Wire holding method**_
- Wires have looped ends, in the same fashion utilized by Icarus: wrapping the wire around itself.

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## 
Does this work? 

Good indications:
Icarus has 50,000 wires installed in this fashion
They had no breakage or unwinding so far
Good results in preliminary testing
More testing required

_**Does this work?**_** **
**Good indications:**
- Icarus has 50,000 wires installed in this fashion
- They had no breakage or unwinding so far
- Good results in preliminary testing
- More testing required

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## G-10 Board holding mechanism:

- Requirements:
- Prevent dropping of parts
- Minimize assembly mistakes
- Allow alignment
- Distribute load evenly
- Inexpensive

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Board holding mechanism concept 

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

##  Field shaping cage                 (Model by Bartoszek Engineering)

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Assembly: preliminary thoughts 

It can be done sequentially, from one end to another or from the center out
Welding should be done prior to wire installation as much as possible
Cleanliness is essential
Wires can be attached to G-10 boards and spooled into drums prior to assembly
Platforms built into the trusses maybe used for mounting the boards

- It can be done sequentially, from one end to another or from the center out
- Welding should be done prior to wire installation as much as possible
- Cleanliness is essential
- Wires can be attached to G-10 boards and spooled into drums prior to assembly
- Platforms built into the trusses maybe used for mounting the boards

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Issues

No “show stopper” has been identified: much fewer uncertainties than CDF/COT had, for instance (mainly due to stringent wire positioning requirements)
Cost is very sensitive to manufacturing processes due to high number of components
Likewise, high number of components also makes a successful time schedule is very sensitive to adequacy of planning
Prototyping and testing of individual components is the natural course of action for a project like this 

- _No_ “show stopper” has been identified: much fewer uncertainties than CDF/COT had, for instance (mainly due to stringent wire positioning requirements)
- Cost is very sensitive to manufacturing processes due to high number of components
- Likewise, high number of components also makes a successful time schedule is very sensitive to adequacy of planning
- Prototyping and testing of individual components is the natural course of action for a project like this

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Fermilab Liquid Argon Experiments 

- Fermilab Liquid Argon Experiments

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## 
Wire: preliminary tests

**Wire: preliminary tests**

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## 	

Test results:

2 wraps around the pin and 4 wraps around itself were enough to prevent unwinding .

Pulleys are a reliable and simple way to guide the wires - better than bare rods.

_**Test results:**_
- 2 wraps around the pin and 4 wraps around itself were enough to prevent unwinding .
- Pulleys are a reliable and simple way to guide the wires - better than bare rods.

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Pulleys mounted to the side 

- Drawing by
- Chuck Grimm

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05

## Wire board holding mechanism

- FLARE - Wire and Cathode Planes                                                              Rafael Silva

- 04/19/05