UCSB 4-Hybrid Thermal Test System Status

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UCSB 4-Hybrid Thermal Test System Status
13 October 2003 Sam Burke Lance Simms UCSB
HEP Group
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Status

• UCSB 4-Hybrid Thermal Test system is operational
• ARCS and ACDC software integrated so that test is
  a one button operation

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Setup in UCSB Clean Room
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UCSB Cold Box
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Installing Hybrid/PAs
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Pulser Functional

• Pulser had been triggering on noise. Needs to be
  synchronized with ARC Clock .
• Twisted cable from ARC Controller card used
• Eliminated noise in UCSB LVDS/CMOS Converter
• No LVDS signals from ARC Controller Card

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LVDS Signal?

• ARC Boards with
• functioning External Bus
• Ser 29
• Ser 31
• ARC Boards with
• non-functioning External Bus
• Ser 56
• Ser 57
• Ser 59

LVDS Signal
Noise
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ARC Controller Problem

• Bad Batch of ARC BOARDS LVDS Driver and LVDS
  Receiver U32 and U33 were switched during board
  assembly. Problem was never discovered.
• External Buss connector and associated ICs on
  lower left of photo.

U32
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With Pulser Operational

• Opens detectable in Scope Mode

Intentionally Plucked Bonds Show up in Pedestal
Profile
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With Pulser Operational.

• Opens are also detectable in Pedestal Noise Test

Plucked Bonds
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Grounding Issues
Huge spikes in noise at APV edges
Same Problem CERN was having.
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Using their same method
Ground lines connected to Support plate by
silver strip Problem Solved No more spikes
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Thermal Cycle Test

• Test Time 42 min.
• Three Sets of Tests
• Pedestal Noise
• Pulser
• Short Detection

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Automated Test Results

• Final Report After Thermal Cycle Test
• Lists -Shorts
• -Opens
• -Noisy Channels

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So Far At UCSB

• 6 Hybrids Bonded and Thermal Cycled

Serial Shorts Opens
Failure at -20
30216711300712 30216711600699 30216711500720 30216
711500730 30216711500732 30216711500733
No
0
0
No
0
0
No
0
0
No
0
0
0
0
No
0
No
0
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And Now

• Building a new peltier plate in order to bring
  test time down
• Goal Loading Testing Unloading
• in 50 minutes

Nevertheless, ready to thermal test on mass scale