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BLM for the Injectors project Cabling non-Conformities

LIU-PSB Working Group Meeting ( 15/08/2013). BLM for the Injectors project Cabling non-Conformities . CKB50 : Coaxial cable. Brown polyolefin. SI-CU 23x9x0.16. Diameter in [mm]. 11.5 +/-0.3. High Mu FE. PETP. SI-CU 23x9x0.16. 8.71. PETP. 8.07. AL-PETP-AL. 8.03. PE. 7.98. CU.

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BLM for the Injectors project Cabling non-Conformities

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  1. LIU-PSB Working Group Meeting (15/08/2013) BLM for the Injectors project Cabling non-Conformities Christos Zamantzas (christos.zamantzas@cern.ch)

  2. CKB50: Coaxial cable Brown polyolefin SI-CU 23x9x0.16 Diameter in [mm] 11.5 +/-0.3 High Mu FE PETP SI-CU 23x9x0.16 8.71 PETP 8.07 AL-PETP-AL 8.03 PE 7.98 CU 7.94 7.3 7.25 2.6 Cable: Signal -(1000V)- Screen 1 –(500V)- Screen 2 (Triaxial) 1. Adapter: BNC or SMA Signal - Screen 1 (coaxial) Connector male: (receptacles) -Signal -Isolation (1000V) -Screen 1 -Isolation (500V) -Screen 2 (Triaxial) Connector female: (cable) -Signal -Isolation (1000V) -Screen 1 -Isolation (500V) -Screen 2 (Triaxial) 2. Adapter: BNC / SMA / N-type Signal - Screen 1 & Screen 2(coaxial) 15/08/2013

  3. Cabling Diagram Connector Types: enclosed in cable tray tube ~ 1 m 50 ÷ 200 m ~ 5 m Ionization Chamber HV Power Supply (~1500 V) HV BNC CKB 50 SMA BNC Signal Acquisition Card (BLEDP) Internal Screen 1 BNC External Screen 2 SMA TRIAX • Screen of HV BNC is open on the IC side to assure there is no ground loop. • Internal screen to shield low frequency noise (GND only on electronics side, IC is floating). • External screen to shield high frequency noise. 15/08/2013

  4. CKB50: non-conformity Brown polyolefin SI-CU 23x9x0.16 Diameter in [mm] 11.5 +/-0.3 High Mu FE PETP SI-CU 23x9x0.16 8.71 PETP 8.07 AL-PETP-AL 8.03 PE 7.98 CU 7.94 7.3 7.25 2.6 Cable: Signal -(1000V)- Screen 1 –(500V)- Screen 2 (Triaxial) • Isolation between the two shields not optimal. • Added additional steps for the connector assembly to avoid leaks. • At random positions discovered shorts between the two shields. • Not possible to be used with Triaxial functionality. 15/08/2013

  5. Cabling Non-Conformities Connector Types: enclosed in cable tray tube ~ 1 m 50 ÷ 200 m ~ 5 m Ionization Chamber HV Power Supply (~1500 V) HV BNC CKB 50 SMA BNC Signal Acquisition Card (BLEDP) Internal Screen 1 BNC External Screen 2 SMA TRIAX cablenon-conformities • Internal and External screen are shorted in multiple and random places. • Non-conformity (most probable) due to thin insulator. 15/08/2013

  6. Alternative Cabling Configuration Connector Types: enclosed in cable tray tube ~ 1 m 50 ÷ 200 m ~ 5 m Ionization Chamber HV Power Supply (~1500 V) HV BNC CKB 50 SMA BNC Signal Acquisition Card (BLEDP) Internal Screen 1 BNC External Screen 2 SMA TRIAX cablenon-conformities • Connect both shields together on both sides • Leave the ground on the detector side floating • Configuration will be very similar like in LHC system. 15/08/2013

  7. Meeting with manufacturer • On the first meeting agreed: • Modification of the specifications • Two more PET-foils over the magnetic screen. • No problems mounting the connector. • The electrical properties will not change. • Manufacturer to run a trial until end of September • We will test the sample and release the cable until mid-October • If all ok, manufacture about 6km until end of November • Re-installation to begin mid-January. 15/08/2013

  8. Next steps • Next week, meet with manufacturer on financial matters. • Costs of the new production • Handling of the stock already at CERN • Decide if we continue with the installation or remove all and wait for the new production. • Currently the issue affects 32 detectors • During LS2, 80 additional will need to be installed. 15/08/2013

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