Transcript No Slide Title - Duke Atlas

Fuse Box Production
Chiho Wang/Jack Fowler
Chiho Wang
Duke University
1
ATLAS TRT
Dubna, May 2005
Fuse Box Assembly
 1 fuse box “set” supplies HV to
1 “stack” of 3 modules.
 32 + 3 (10% spare) = 35 “sets”
of fuse boxes to be made.
 Each fuse box “set” consists of
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6 fuse boxes: 2 of each
module type
22 HV coax cables:
 6 for type 1
: 3 HV lines / box
 6 for type 2
: 3 HV lines / box
 10 for type 3
: 5 HV lines / box
1 HV connector: 51-pin:
 22 HV + 22 ground + 2
interlock + 1 case
ground + 4 empty
Chiho Wang
Duke University
2
ATLAS TRT
Dubna, May 2005
What to assemble in the fuse box
 Circuit boards = 2 per fuse box
 Spring contacts = (# fuses) + (4 ground contacts/box)
 Filter circuits:
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1 per HV line = 2 x 1kΩ Resistors + 1 x 870pF Capacitor
 Mounting nuts (Ultem) = 2 per fuse box
 Fuses: (contain extra fuses due to symmetry)
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Type 1: 44 fuses/module (22/box), 42 in use.
Type 2: 68 fuses/module (34/box), 65 in use.
Type 3: 104 fuses/module (52/box), 100 in use
Total (for 35 sets) = 7560 + spare
 Jumpers
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1 ground jumper between halves.
1 HV jumper between halves, for type 2 and type 3 only
 HV cables
Chiho Wang
Duke University
3
ATLAS TRT
Dubna, May 2005
Old Fuse Box
GND jumper
GND jumper
GND jumper
HV jumper
Mounting Nuts
Switched to the other half in new design
Similar jumpers also needed for new fuse box
Chiho Wang
Duke University
4
ATLAS TRT
Dubna, May 2005
HV Granularity & Current Draws
498-735 μA/line
999-1253 μA/line
565-1087 μA/line
3 lines
3 lines
5 lines
Chiho Wang
Duke University
5
ATLAS TRT
Dubna, May 2005
Implementation
 For each type of module:
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1 type of fuse box
1 length of cable
Applies to (4 HV Kapton positions) x (4 connector
locations).
 Neighboring modules are supplied from opposite
ends
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Odd # modules from side A (back side)
Even # modules from side C (front side)
 The HV cable is made long enough to swing to
neighboring modules in case switching side is
necessary.
Chiho Wang
Duke University
6
ATLAS TRT
Dubna, May 2005
Front Side Connections
Nominal Fuse Box
Connection
Connectors
Pattern repeats
in 4 modules interval
(i.e. every 2 sectors)
Chiho Wang
Duke University
7
ATLAS TRT
Dubna, May 2005
Connections & Naming Convention
Another table to map: straws  fuse  HV line !
Chiho Wang
Duke University
8
ATLAS TRT
Dubna, May 2005
Production procedures
 Mark/label fuse box
 Glue circuit board to fuse box
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Use high temperature RTV.
Along the front edge of ckt to
prevent flux from flowing
under circuit board.
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 Place components on ckt board
and oven solder them.
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Spring contacts + filter
resistors + filter capacitors.
Spring contacts are clamped
in place in soldering
process.
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Chiho Wang
Duke University
Clean fuse box
At Duke
manpower permitting
Glue mounting nuts
Tape together 2 halves of fuse boxes
Solder fuses by hand
9
In case of resistor substitute
may use oven soldering.
Clean fuse box(?)
Solder HV cable by hand
Solder jumper wires by hand
Clean fuse box
Spot glue HV cable & jumper wires
for strain relief
Bake/dry fuse box right before
coating
Coat fuses & wires with conformal
coating
Label HV cables
Cut HV cable to length and attach
connector
ATLAS TRT
Dubna, May 2005
Parts Status
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G10 boxes: 16 modules/type in hand, ~ end of May
Circuit boards: in hand
Spring pins: in hand, need cutting, bending
Filter resistors + capacitors: in hand
Mounting nuts: ½ in hand, ½ to be made
Fuses: under production
(Substitute resistors: ordered)
HV Cable: available from Herve.
HV Connectors: in hand
Ultem screws: in hand
Mounting brackets: quoted, placing order.
Chiho Wang
Duke University
10
ATLAS TRT
Dubna, May 2005