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CMS Tracker Internal Cables

CMS Tracker Internal Cables. CMS Tracker Electronics meeting, CERN 9 April 2003 A. Bocci, S. Paoletti, G. Parrini INFN and University of Florence. Detector volume. Tracker patch panel. ~ 70 m. ~ 35 m. ~ 5 m. Counting room PSU. Cavern (balconies). Tracker modules. ALLUMINUM

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CMS Tracker Internal Cables

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  1. CMS Tracker Internal Cables CMS Tracker Electronics meeting, CERN 9 April 2003 A. Bocci, S. Paoletti, G. Parrini INFN and University of Florence

  2. Detector volume Tracker patch panel ~ 70 m ~ 35 m ~ 5 m Counting room PSU Cavern (balconies) Tracker modules ALLUMINUM (Material budget) COPPER (Power dissipation, cost) Counting room PSUs Internal cables • We need ~2000 cables in order to bring to the modules: • power for the front-end electronics (LV2.5, LV1.25) • HV • services • Design considerations • power dissipation • inductive effects  voltage overshoots, transients • isolation, cross-talk • space, number of needed services • TIS safety rules (radiation, fire, …) S. Paoletti "CMS Tracker Internal Cables"

  3. Multi Service Cable • Max use of material to bring services • ~ 17% of the section brings LV power • HV, temp. services, LV senses and power wires are isolated groups with aluminized protection shield and drain • Developed at CERN • “flavors”: • Cu power conductors • Silver-plated Aluminum power conductors (CAB60, CAB48, CAB36) S. Paoletti "CMS Tracker Internal Cables"

  4. Low Inductance Cable • Max use of material to bring power (~ 30 % of the section) • The wire structure reduces the inductive coupling • Outer Cu wires provide an effective shielding to internal service wires. Prototypes: Novacavi S.p.A. • Developed at Florence • “flavors”: • LIC 17: “thick” (17 mm), low power dissipation. Holds 72 Cu 0.8 mm2 power wires. Could be used outside cavern. • LIC 12: holds 44 Cu 0.8 mm2 power wires. Could be used b/w cavern and patch panel. • LIC 10: holds 44 Cu 0.6 mm2 power wires. 44 Cu wires: 7 LV1.25 14 LV2.5 23 LVRTN S. Paoletti "CMS Tracker Internal Cables"

  5. Low Inductance Cable (II) • LIC 11 • Latest prototype (still to be qualified): • 50 Cu 0.6mm2 power wires • 20 service wires S. Paoletti "CMS Tracker Internal Cables"

  6. Resistances over 35 m long cable predicted (W) measured (W) RRTN R2.5 R1.25 RRTN R2.5 R1.25 Cu MSC (12mm) 0.063 0.100 0.164 0.07 0.11 0.17 LIC 12 0.033 0.055 0.109 0.03 0.06 0.13 LIC 10 0.047 0.078 0.155 0.05 0.10 0.17 Resistance Resistance has clear implications on global power consumption Optimal conductive material distribution (fixed: 1/R1 + 1/R2 + 1/R3 1/R) for minimum of resistance is obtained when: R1*i1 = R2*i2 = R3*i3 S. Paoletti "CMS Tracker Internal Cables"

  7. Power Dissipation The formula (with typical currents): W(KW )=56.101R2.5(W) + 12.343R1.25(W) + 121.027RRNT(W) 0.070  R2.5(W) 0.17 0.14  R1.25 (W)0.26 0.042  RRTN (W)0.10 LIC12 (35m, Cu) + LIC10 (5m, Cu) MSC12 (35m, Cu) + MSC10 (5m, Al/Ag) 11 W(KW)  25 S. Paoletti "CMS Tracker Internal Cables"

  8. Impedance • Sudden current consumption variations from the front-end electronics cause overshoots which depend both on the impedance of the line and on the reaction of the power supply (PS) unit. • The choice of the cable has implications on the PS qualification • The lower the line impedance, the less likely any disturbance will propagate to nearby channels Measured characteristic impedance: 40 m Cu MSC: Z0 ~ 25-30 W 50 m LIC 10: Z0 ~ 2-3 W 50 m LIC 12: Z0 ~ 2-3 W S. Paoletti "CMS Tracker Internal Cables"

  9. LIC Qualification Tests • Inject DI = 4 A on 2.5 V line. Look at: • DV2.5 (sensitive to R2.5 , PS response, inductance of the line) • DV1.5 (cross-talk effect) • DVHV (cross-talk effect) • Measurement of HV isolation from external noise. Configurations tested: [ LIC (17 mm, 100m) ] + LIC 12 (50m) + MSC-Al(5m) LIC 10 (50m) + MSC-Al(5m) [ LIC (17 mm, 100m) ] + MSC-Cu(12mm, 40m) + MSC-Al(5m) S. Paoletti "CMS Tracker Internal Cables"

  10. Experimental Setup I2.50 = 2.5V/RL I1.250 = 1.25V/R’L I2.5 =I2.50 + DI 2.5 V DI = 4 A RL CL LVCOMMON R’L CL rise time (~300 ns) 1.25 V CABLE I1.5 =I1.50 HVCOMMON RHV HV Vload + P.S.U. - S. Paoletti "CMS Tracker Internal Cables"

  11. ~1.3 V Response to sudden I2.5 variations ~1.7 V I02.5 = 0 I01.25 = 0 50m LIC12 + Al MSC 40m Cu MSC + Al MSC 50m LIC10 + Al MSC 50m LIC10 S. Paoletti "CMS Tracker Internal Cables"

  12. Cross talk on LV1.25 due to sudden I2.5 variations I02.5 = 0 A ; I01.25 = 1.85 A S. Paoletti "CMS Tracker Internal Cables"

  13. DV2.5DV1.25DV1.25/DV2.5 I02.5 = 0; I01.25 = 0 50m LIC10 + 5m Al MSC 1.30 0.45 35% 50m LIC12 + 5m Al MSC 1.30 0.75 58% 40m Cu MSC + 5m Al MSC 1.70 1.55 90% I02.5 = 0 ; I01.25 = 1.85 A 50m LIC10 + 5m Al MSC 1.30 0.25 19% 50m LIC12 + 5m Al MSC 1.25 0.35 28% 40m Cu MSC + 5m Al MSC 1.80 0.65 36% I02.5 = 2.2 A; I01.25 = 1.85 A 50m LIC10 + 5m Al MSC 1.00 0.20 20% 50m LIC12 + 5m Al MSC 0.80 0.25 31% 40m Cu MSC + 5m Al MSC 1.30 0.55 42% V2.5 - V1.25 Results S. Paoletti "CMS Tracker Internal Cables"

  14. Cross talk on the HV lines due to sudden I2.5 variations LIC10 + Al MSC ~150 mV (~ 1/10 DLV2.5) S. Paoletti "CMS Tracker Internal Cables"

  15. Cross talk on the HV lines due to sudden I2.5 variations The observed cross talk on HV lines is induced by the sense wires ! No cross talk coming from LV power lines. Test repeated using 4 outer wires as senses for 1.25 and 2.5 lines S. Paoletti "CMS Tracker Internal Cables"

  16. HV Isolation Test DV = 10 V 100 KW Vload 100 m long electric cable (R=100 KW) was placed near to the LIC12 and to the Cu-MSC cables. One square wave (DV = 10 V) is injected inside the 100m long cable The voltage difference at the sides of one HV internal pair is measured DHV (V) 50m LIC11 < 20 10-3 40m Cu MSC < 20 10-3 Both the LIC and the MSC provide very good isolation of service lines from external noise sources S. Paoletti "CMS Tracker Internal Cables"

  17. TIS Safety Rules • Two main documents: • CERN IS-23 (“Criteria and standard test methods for the selection of electric cables, wires …”) • report CERN 82-10 ("Compilation of Radiation Damage Test Data") • Both MSC and LIC will have to comply with these rules (low smoke halogen free sheathing, fire retardant, rad. Resistance …) • LIC cable: • the cable sheathing compound is “Megolon S304” (LS0H, fire-retardant) already approved by CERN and complying with IS-23 • the cables are certified by the firm for: • jark test • Flexibility elongation • Heat shock (1/2 h at 2000C) • The firm will certify the cable for fire test IEC 332-3 S. Paoletti "CMS Tracker Internal Cables"

  18. Conclusions • LIC cables give very satisfactory results in tests for: • inductive effects on LV lines • cross talk on LV lines • cross-talk on HV lines • LIC and MSC cables optimised for: • MSC: services • LIC: power dissipation, impedance • LIC cables were successfully deployed in the TIB system test and in the PSU qualification • The number of services inside LIC is a trade-off with dimensions (up to 20 services in 11 mm diameter) • The connectorization for LIC cables is being developped • Novacavi can certify the LIC cable according to CERN rules S. Paoletti "CMS Tracker Internal Cables"

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