TJF 04/05/07
SLHC - WP7 Barrel
LAYOUT OF SERVICES AT THE BARREL ENDS:
REALISTIC ASSESSMENT OF THE SPACE ENVELOPE
outside Z +1000 and Z -1000
With evaporative cooling, the exhaust cooling pipes and their
connectors may be the limiting factor. At this stage a possibility
is to use Swagelok VCR connectors as these are known to work
and can be fitted in restricted spaces.
Staubli connectors need further assessment (forces etc).
The second major factor is the size of the Opto PCB and the
minimum bend radius of fibre ribbons connecting to it.
Cooling pipes will have to be routed outside the PCBs in Z.
PCBs will be a considerable source of heat: cooling pipe
routing could be utilised to cool them – if not, then there may
have to be a separate cooling source – occupying more space.
Allow for this and extra services/grounding & shielding etc.
List of services at barrel/stave end: one set for EVERY ‘stave’
Option A – has separate connectors at end for opto and power.
TJF 04/05/07
see drawings of layouts – slides 4 to 9
Cooling pipes: One low mass ‘U’ pipe unit per stave to:
One 1/8th inch exhaust pipe with VCR Swagelok connector
One input capillary pipe with VCR Swagelok connector
Optical Readout: BUS or thin twisted pairs to optofibre ribbon:
Two PCBs with MUX chips, laser driver, laser and miniature
optical connector (each board 100mm x 20mm x 5mm)(TW)
Power cable connectors:
Two interface connectors – LMT BUS to round cable
(each connector very approx. 30mm x 5mm x 10mm)
Sensor cable connectors: thin twisted pair cables?
1 cylinder surface temperature monitor cable connector
1 gas volume air monitor connector ( ~ 10mm x 10mm x 5mm?)
TJF 04/05/07
Option B – has combined connector PCB at end for opto and power
Suggested by Andy Nichols and Marc Weber:
Assume services are separate for top and bottom rows (20 top + 20 bottom
hybrids – 2 hybrids per module)
One bus cable terminating in one common PCB with chips (elec/opto
converter) and connectors for 10 single module sides. ie 2 per ‘stave’
Each connector PCB would have:
20 DATA fibres
4 CLOCK fibres
5 COMMAND fibres
8 POWER traces
10 HV traces
4 SLOW CONTROL traces
4 DSS/INTERLOCK traces
could be flex circuit
SEE DRAWINGS SLIDE 10 and 11
BARREL END
view from outside end
cooling
pipes
power
cables
from front
readout
optofibres
from front or top
exhaust
connector
cooling input
connector
2 readout
PCBs
connections
sensor connector
OPTION A
Layout type
1
non-standard
bus layout
input
tape to power
cable connectors
exhaust
barrel flange
connector board
support on flange
SECTION through
‘stave’
cooling input
Bus housed in local
connector support with strip links
to connectors on hybrid
cable
module
exhaust
flat cable
rail guides integral with cylinder
flat bus cable
housing &
LOCAL
support
TJF 04/05/07
optofibres
from top
or front (worstcase)
barrel
flange
OPTION A
Layout type
1
OPTO
PCB
BUS
opto
connectors:
sensors and
power
cool
out
barrel
flange
Z=1000
Z=1040
power
(side view)
30mm
power &
sensor
cables
Z=1050
MODULE
cooling
input
100mm
module
connector
R 490
R 380
TJF 04/05/07
barrel
surface
barrel
flange
connectors:
sensors and
power
module
connector
power &
sensor
cables
optofibres
from top
or front – worst case shown!
opto PCBs
Z=1050
cool
out
Z=1040
opto LMTs
split off BUS
Z=1000
MODULE
power connector
LMT
cool
input
OPTION A
Layout type
1
non-standard
bus layout
‘plan view’
single stave
cooling pipes
route out to
cryostat
TJF 04/05/07
BARREL END
view from outside end
readout/CC
optofibres
from front or top
cooling
pipes
OPTION A
LAYOUT
TYPE
2
power
input cable
connectors
power
cables
from front
2 readout
PCBs – dogleg
connections
from LMT
BUS
exhaust
connector
sensor
connector
barrel flange
ends of inner barrel PCBs
SECTION through
‘stave’
cooling input
connector
cable
(or one bus top and
one bus bottom)
module
exhaust
flat cable
flat cable bus
on module
rail guides integral with cylinder
TJF 04/05/07
power &
sensor
cables
MODULE
cooling
input
LMT
power
connectors:
power
connectors:
sensors
Z=1050
Z=1040
Z=1000
R 490
OPTION A
Layout type
2
(side view)
readout/CC
doglegs
cool
out
barrel
flange
100mm PCB opto
readout/CC optofibres
from top
or front
barrel
flange
R 380
TJF 04/05/07
barrel
surface
barrel
flange
connector:
power
module
connector
power
LMT
power &
sensor
cables
cool
input
MODULE
optofibres
from top
or front
opto PCBs
cooling pipes
route out to
cryostat
Z=1050
Z=1000
Z=1040
cool
out
‘opto’ LMTs
split off BUS
OPTION A
Layout type
2
‘plan view’
single stave
connectors:
sensors
TJF 04/05/07
OPTION B single board for all connections - Andy Nichols and Marc Weber
breakable connectors
Z=0
probably
hard-wired
20 single DATA fibres
or 3 x 12way ribbons
(or 4 x 8 etc)
4 clock fibres
4 command fibres
or 1x 8way ribbon
Z = 1000 barrel end
detector
hybrid
BUS serving
10 single
module sides
*
4 power (out & return)
lines
*
10 HV lines
*
*
4 slow control
4 DSS/interlock
electric – opto
board
*
could be one flex circuit
TJF 04/05/07
BUS CABLE suggestion Andy Nichols and Marc Weber
material: Kapton with copper and or al tracks
size: 35mm wide (estimate) and 300um thick
serves 10 single module sides and runs from Z=0 to barrel end
terminates in one elec – opto converter board (see slide 10)
bus
connector (everything)
MCC and SP chip
detector
hybrid
hybrid
Z=0
PCB
use same connector as for SCT dog-leg (wild guess!) and SCT fibre sizes
hybrid
bus
(modules shown here are assumed to be overlapping)
TJF 04/05/07
TJF 04/05/07
Various concerns with this:
size of bus –
increased length of hybrid
bus
connector (everything)
MCC and SP chip
hybrid
detector
hybrid
Z=0
size of PCBs
will increase
envelope in Z
PCB
upper
module
lower
module
hybrid
large numbers of connectors!
how can each bus connect to
each hybrid – access?
top layer bus
bottom layer bus
chips near connectors
Recommendations for Barrel construction with reference
to services connection at the barrel ends:
Make both ends the same wrt distance of edge of
last module from the barrel ends in Z.
Barrel flange construction: must be designed to be strong
enough to support 1 ‘trellis’ for PCBs, cooling connectors,
power and sensor connectors per ‘stave’.
Flange surface needs to be flat, with enough space
and strength for extra fittings/holes.
All services should come straight off barrel end – all
routing of services in R/PHI should be done off the barrel.
Keep barrel surface near ends as clear as possible.
Design Interlinks to be as narrow as possible.
TJF 04/05/07
Evaporative cooling pipes
routing off barrel end.
= input to stave
4 sets of six pairs per quadrant
6 pairs go to one cooling channel
on cryostat
22.50
0
11.25
TJF 04/05/07
0
Same for both Option 1 and Option 2
6 exhaust
pipes go to
each ‘old’
cooling
channel
exhaust
manifold
6 input pipes
go to each
cooling
channel
on cryostat
will need
to have
manifolds
22.50
0
11.25
TJF 31/05/07
0
Evap. cooling
routing off
barrel end.
= input
= exhaust
will need
Pressure
Relief Valves
ALL SERVICES on BARREL END
as for Option 1 layout 2
Evaporative cooling pipes
routing off barrel end.
= input to stave
4 sets of six pairs per
quadrant 6 pairs go to
one cooling channel
on cryostat
pair of
opto
PCBs
LMT
power
connectors
22.50
0
11.25
TJF 04/05/07
0
sensor
connectors
ALL SERVICES on BARREL END
as for Option 1 layout 1
Evaporative cooling pipes
routing off barrel end.
= input to stave
4 sets of six pairs per
quadrant 6 pairs go to
one cooling channel
on cryostat
pair of
opto
PCBs
end on
LMT
power
connectors
22.50
0
11.25
TJF 04/05/07
0
sensor
connectors