AMS02 Cryomagnet Dump Diodes

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AMS-02 Cryomagnet Dump Diodes

• Y.Y.Hwang, M.Chen, S.I.Ma

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Outline

• Thermal vacuum test
• Status

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Port Diodes
93
CAB
32
Opening Switch
CCS
80
32 Conductor cable
L 47H
I 460A
13
Magnet
-
Cryo
Starboard Diodes
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Experimental Methods

• A programmable D.C. power supply is used to
  simulate
• Since the circuit resistance R is dependent on
  temperature, we must check the value of R at all
  time.
• For one diode chain burned, the total impedance R
  will be double of Rmeasured . ? R ? 2Rmeasured
• Iteration process

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Experimental Set-up
I
V
Programmable D.C. power supply
Multi-channel recorder
V(t)
Sill trunnion joint
In(n?t)
Vacuum chamber

• Vacuum chamber pressure is less than 10-5mbar
• Temperature of 13 channels is recorded
• An programmable current is injected into test
  dump diodes

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Thermal vacuum chamber design

• Temperatures of nine diodes, three diode mounting
  blocks and 1 sill joint are recorded.
• Input voltage is instantaneously detected.

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Status (1)
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Status (2)
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Status (3)
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Status (4)