1 h c a l hf cable plant options hf cable plant options december 22, 2010 t. shaw
DESCRIPTION
3 H C A L Current HF FE Module Front Panel Each FE module reads out 6 QIEs.TRANSCRIPT
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HF Cable Plant Options
HF Cable Plant Options
December 22, 2010T. Shaw
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Existing RoBox24 PMTs/RoBox
Signal & Reference signals sent on aPair of Coax for each PMT
72 RoBox in system
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Current HF FE Module Front Panel
Each FE module reads out 6 QIEs.
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HF Cable Upgrade
Current plans• Multi-anode readout -> Fit 2x
or 4x channels/cabling into available space; no degradation in performance
• Use same FE modulesSome kind of patch
panel/connector adapter near FE crates to convert new cabling to present connectors.
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Cabling Selection
4 cable schemes are under review1. VPLSP cables; 24-pair, low skew, 100 ohm
differential impedance2. Samtec 50 ohm High Isolation Cable; 50 ohm
coax3. Tyco Z-Pack HM-ZD cables; using 26 AWG
coax; highly customizable 4. Doubling of current cables(probably only
plausible with a doubling of channels)
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Samtec V-Port Cables
We have (qty) 3 5-meter cables in hand!
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Testing Samtec VPLSP
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Testing Samtec VPLSP
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Testing Samtec VPLSP
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Samtec V-port Pros/Cons
Pros• Overall shield• Rugged construction
Cons• Large reflection when we try to use it in
common mode terminated to 50 ohms
Conclusion• Probably do not want to use this
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Samtec 50 ohm coax cable assemblies
We have (qty) 3 5-meter cables in hand!
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Testing Samtec 50ohm Hi-Isolation Cables
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Testing Samtec 50ohm Hi-Isolation Cables
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Testing Samtec 50ohm Hi-Isolation Cables
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Samtec Hi-Iso Pros/Cons
Pros• Cable almost as good as what we are using in
terms of transmission/reflection• Smaller footprint than what we use now (~50%
smaller)• Fairly rugged connector
Cons• No overall shield; can explore custom shield
with vendor, but it will not be incorporated into connector
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Tyco Electronics Z-Pack connector line offers dense cable assemblies
We have some long 26AWG coax samples in hand!
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Testing Tyco Coax w/ SMA connectors
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Testing Tyco Coax w/ SMA connectors
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Testing Tyco Coax w/ SMA connectors
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Testing Tyco Coax w/ SMA & Hm-Zd connectors
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Testing Tyco Coax w/ SMA & Hm-Zd connectors
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Testing Tyco Coax w/ SMA & Hm-Zd connectors
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Tyco z-Pack Pros/ConsPros
• Cable performance close to what we have now• Density allows a large number of conductors in a given
space
Cons• Density of connectors will provide challenge routing
from connector to QIEs• Density may contribute to crosstalk (need to look at
this)• No Overall shield; vendor will work with us, but the
overall shield is not incorporated into the connector• Connectors are NOT rugged; I think they could be used,
but with care!
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Spec’s of current Cable
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Current D-shell Cables
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Testing D-shell Cable
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Testing D-shell Cable
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Testing D-shell Cable
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D-shell Pros/Cons
Pros• Best cable performance• Overall shield incorporated into design• Rugged, proven design• No special adapters needed for input to
current FE Electronics BoardsCons
• Large footprint, could increase density by loading all 8 instead of 6 positions.
• Probably only allows for two-anode readout!
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Main trunk cable costs(does not include adapters or cabling inside
RoBox)
Cable Type#channels/cable
#cables required for two anode readout
#cables required for four anode readout
cost of cable
cost of connector
Total for 2 anode readout
Total for 4 anode readout
#channels for two anode readout 72 RoBox * 24 PMT * 2CH
#channels for two anode readout 72 RoBox * 24 PMT * 4CH
Samtec VPLSP 12 288 576 $278 $80,064 $160,128 3456 691224-pair -> 12 Sig/Refconnectors $10 $5,760 $11,520
$85,824 $171,648
Samtec Hi-Isolation 4 864 1728 $245 $211,680 $423,360connectors $10 $17,280 $34,560
$228,960 $457,920
AMP HM-Zdconnectors
HF Cables now in use 3 1152 2304 $78 $89,856 $179,712price from 2004
$25 $57,600 $115,200$147,456 $294,912
***NOTE if we re-use cables, can save half the cost $.
HF Cables now in use 4 864 1728 $104 $89,856 $179,712price from 2004
$25 $43,200 $86,400$133,056 $266,112
***NOTE If we remake, we could load up all 8 position instead of 6
NOTE - SPARES ADD 20%
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Conclusions
Recommendations• 2 Anode readout
Buy d-sub cables similar to what we have now, but stuff all 8 coax positions
• 4 Anode readoutPursue the Tyco Z-pack cable solution.Second option could be Samtec’s Hi-isolation
cables