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.