Davide Piccolo INFN Napoli
Electronics Review 12-05-2005
Review of cable procurement and installation
Davide Piccolo
INFN Napoli
Davide Piccolo INFN Napoli
Electronics Review 12-05-2005
RPC cables status
• HV, LV, DCS, Tsensor cables: ready to be prepared with final connectors. All the material (cables + connectors) are at CPE factory in Milan waiting for cutting length. Cable preparation prescriptions fixed.
Expected time to delivery complete cable is 3 weeks starting from the cutting length definition.
On thesheld(20 cm)L
EASY side
LL1
L620 cm
LV cable
DCS6 cable
T sensor cables
Davide Piccolo INFN Napoli
Electronics Review 12-05-2005
RPC singal cable status• Cern launched an official tender end of 2004• five competitors:
– NOVACAVI 3,189 chf/mt– Tecnikabel 2,328 chf/mt– PLASTICAVI 1,919 chf/mt– Nexans 2,596 chf/mt– Intercond 3,040 chf/mt
• Results of our time skew measurements (worst case):– NOVACAVI 1.1 ns– TECHNIKABEL 1.5 ns– PLASTICAVI 2.1 ns
• Tests has been performed on two/three samples of 25 mt pieces long for each type
• Request was fixed in t 1ns/25 mt• Work is in progress in order to choose the best solution
Davide Piccolo INFN Napoli
Electronics Review 12-05-2005
From: Antonio Ranieri, Flavio Loddo
NOVACAVI 25 mt
PLASTICAVI 23 mt
TEKNICABEL 25 mt
Davide Piccolo INFN Napoli
Electronics Review 12-05-2005
Cable cutting lengthCutting length divided into 3 pieces:• radial length • periphery length• inside rack length
Radial layout
The radial part has 4 symmetries formthe routing point of view ZpL, ZpR, ZmL, ZmR;• ZpL e ZpR READY (sect 10, 11)Symmetry broken for MB4:• every MB4 has his own symmetry• 30 % of the MB4 symmetries READY• inside Rack length near te end• We are waiting for the periphery length in order to cut the cables for the first 2 sectors
Davide Piccolo INFN Napoli
Electronics Review 12-05-2005
Cabling at LB sideRack plant
front
back
Cable entrance
Air flow
175215
backplane
LB crate
Option 1: LB crate mounted on the front side (backplane at 175 mm from front)
Option 2: LB crate mounted on the back side (backplane at 600 mm from the front)
Davide Piccolo INFN Napoli
Electronics Review 12-05-2005
LB crate positionOption 1: crate on the front sidevery difficult to cable and big amount of cables on the path of the air flow
Option 2: crate on the back sidemore easy to cable no cables on the path of the air flow,But front side of the LB crate at a distance of 600mm from front side, we have to close the frontfor air flow problem and create a path for front cables, we have to modify the cratesto move backward the backplane (is not an issue)
Front of
LB crate
Davide Piccolo INFN Napoli
Electronics Review 12-05-2005
Fixation tool
Davide Piccolo INFN Napoli
Electronics Review 12-05-2005
Conclusions
• HV-LV-DCS-Tsens cables almost all material is ready. We are waiting for cutting length
• SGN cable: work on progress for the tender. Connector choosen (BERG or ODU connector). A preproduction of cable preparation for the barrel (157 cables for sector test) will be done at CPE
• Cable fixation tool/LB crate : invetigating several solutions. We have drawings. Some proptotype will be prepared in Napoli and we will decide the best solution after tests on complete crate inside the rack.
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