1 h c a l hf cable plant options hf cable plant options december 22, 2010 t. shaw

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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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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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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 & 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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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

1 h c a l hf cable plant options hf cable plant options december 22, 2010 t. shaw

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