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THE UPGRADE OF TT SENSORSC-50 TO THE REDEL CONNECTOR

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OverviewSummary

1. What is the proximity equipment?

2. The need of DFB instrumentation upgrade

3. Decision on whether to exchange connectors in the tunnel or in the

laboratory

4. Replacement of Cannon C-50 to REDEL connector

5. Number of Cannon C-50 connectors to be modified

6. Validation of the replacement: Continuity and HV test bench

7. Conclusion

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1 What is the proximity equipment?

1. Connection box which routes the current lead temperature sensors and

V-taps used for circuit protection

2. Drawing of the PE High current module

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During ELQA tests of RB circuits, lot of HV breakdowns were observed!

The breakdown usually damaged the cryo conditioner card reading the temperature sensor.

TE/CRG claimed that the defect was mostly coming from the C50 connector which is not appropriate for HV

As a common agreement, it was decided to upgrade this C50 connector with a proper HV connector

Together with TE/CRG, it was decided to replace the Cannon C50 connector by the REDEL SLGH51 (Lemo)

connector

After LS1, TE/CRG will consolidate their conditioner card, and the RB circuit will be tested at 2.1kV

2 The need of DFB instrumentation upgrade

Cannon C50

Proximity Equipment

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3 Do we upgrade it in the tunnel?• During a dedicated meeting among our section, we discussed

the possibility of upgrading the PE in the tunnel or in the Lab:

Advantages Disadvantages

1. Only one cable disconnection is needed (C50-1)

2. No need to dismount the box from the Frame

3. No risk of damaging the fragile cable segment

1. Poor illumination

2. Very bad access to the PE

3. Dust, noise…

4. More human resources needed

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4 Replacement of Cannon to REDEL connector

Cannon connector(300V)

Redel connector(3,2kV)

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5 Number of Cannon C-50 connectors to be modified

16 connectors will be exchanged, all of them have been already delivered.

While mounting on the Proximity Equipment , a small metal plate, attached to

the REDEL connector, will compensate the difference in size of the previous

connector.

Fig 3. Redel connector with aluminium plate Fig 4. Redel connector modification,

with aluminium plate in AutoCAD.

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6 Validation, Continuity and HV test bench

A dedicated test bench was made for the Redel and Cannon C-50 connector tests. The test bench consists:

Laptop with dedicated software HV crate Digital multimeter

Laptop with dedicated software

HV crate

Digital multimeter

PE-Box

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6 Validation, Continuity and HV test bench

A dedicated test procedure was written

After each test, a report is done and stored for future reference in ELQA dedicated folder in DFS

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Up to date, three crates are fully upgraded and successfully tested.

There are 13 more crates that need to be upgraded

The estimated date for the completion of the project is February 2014

We do not foresee any delays

7 Conclusion

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THANK YOU FOR YOUR ATTENTION