dqhds upgrade: status of hardware design. approach to implementation of the new heater measurement...
TRANSCRIPT
V. Froidbise
DQHDS Upgrade: Status of Hardware Design.
Approach to implementation of the new heater measurement system.
08/06/2011
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Summary
• Requirements• Principles of measurements• Implementation: modifications in situ• New DQLPU crate• Status
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Requirements
1. Current discharge recording during a quench.2. Measurement of resistance value of the
heaters, periodically.
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1st principle of current discharge measurement
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Output stage of DQHDS
U_HDS
Hea
ter
+-
Shunt
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2d principle of current discharge measurement:
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Output stage of DQHDS
U_HDS
Hea
ter
Advantages of the Pulse transformer, called: « Broad-Band Current –Pulse Transformer ».Shielded – Ferrite-Core :
•Galvanic isolation•Maintain of the continuity in the wire•Less noisy
+-
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With measurement of resistance value of the heaters
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Output stage of DQHDS
U_HDS
Hea
ter
+-
Constraint: create two connections in the discharge circuit
+-
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Principle schematic of current source
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« Crawford box »
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Modifications or design a new connection box?
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6 cm8 cm
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DQLPU
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Power supply DQQDL_A DQQDL_B DQAMC
FIP
Future Electronics in the DQLPU:
New motherboard + commutation Relays
DQAMC DQQDL_A DQQDL_BCurrent sources+
heaters measurement
Current discharge
measurement
Lateral heat sink
Linear Power SupplySwitching Power Supply
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What is today’s status – and outlook?
• Tests for DQHDS discharge current through a shunt already validated, but sampling frequency must be adapted.
• Waiting for a sample of a toroidal pulse transformer before performing tests and validation (Knud).
• Integration into the existent Crawford box will be envisaged after discussions with RP to see where and what might be done. Reliability of the contact taps needed must be done without weakening of the discharge circuit appropriated connections.
• Simulation/Measurement of a defect in a heater strip validated in a DC method (see Reiner’s presentation and Joaquim’s tests).
• Prototype of a precision current source is under tests, looks promising.• New developments of 3 electronics cards: a motherboard, a heater
resistance measurement board (4 circuits / dipole) and a heater discharge current measurement board.
• Probably a new crate DQLPU: easier to operate.
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