Test of hv prototype boards for lhcb outer tracker
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Test of HV Prototype Boards for LHCb Outer Tracker. NIKHEF, Amsterdam The Netherlands 2003-10-16. HV Boards. x 32. Johanson Capacitors PCB Embedded. Working HV = 1,600V Mass Production: 1,950. Test items: Leakage Current Capacitance Micro-cracks inside Caps. Experimental Setup.

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Test of HV Prototype Boards for LHCb Outer Tracker

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Test of hv prototype boards for lhcb outer tracker

Test of HV Prototype Boards for LHCb Outer Tracker

NIKHEF, Amsterdam

The Netherlands

2003-10-16


Hv boards

HV Boards

x 32

Johanson Capacitors PCB Embedded

Working HV = 1,600V

Mass Production: 1,950

  • Test items:

  • Leakage Current

  • Capacitance

  • Micro-cracks inside Caps


Experimental setup

Experimental Setup

HV to gnd net on HV boards may contributes to the measured leakage currents!


Experimental setup cont

Experimental Setup (cont.)

HV = 2kV, Thermal Cycling = 20oC ~73oC,

Time = 24days, 15 boards are tested


Temperature cycling

Temperature Cycling

  • Temperature Cycle:

    20oC 45 min.

    20oC 73oC 15 min.

    73oC 45 min.

    73oC 20oC 15 min.

  • Relative Humidity, not controlled, but kept low when temperature goes down

Due to unknown error of the temperature control system


Leakage currents

Leakage Currents

Leakage currents of 15 boards are logged,

as well as the temperature and relative humidity


One thermal cycle

One Thermal Cycle

Left: with gnd net on HV board connected

Right: only 32 output pins of capacitors connected

Contribution from HV to gnd net on HV board:

[email protected]=20oC and [email protected]=73oC


Correlation with temperature and rh

Correlation with Temperature and RH

Spread at T=73oC (T=20oC) is caused by time needed to warm up (cool down) the capacitors inside PCB

Not sensitive to RH anymore


Spikes

Spikes

  • It is highly suspected that:

  •  T goes down to <0oC due to unknown error;

  • ice formed on the board surface;

  • T goes up to 0oC, ice turns to be water to make board surface conductive

  • current spike occurs


Leakage current at t 20 o c

Leakage current at T=20oC

Ileak of each board ↓

< 2nA, including the component from HV to gnd net on HV boards


Capacitance measurement

Capacitance Measurement

  • 480 Capacitors

    479: ~30pF less than before

    1: 187pF, 2/3 of other capacitors

  • A crack found under microscope


Summary

Summary

  • Ileak of each board < 2nA after 24-day HV-on

  • 1 of 480 channels of capacitors has merely been broken by 24-day thermal cycling.

  • Micro-cracks could be detected by thermal cycling, although cycling conditions should be optimized by further study.


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