TF Joint Voltage Drop Instrumentation Robert Marsala (609) Hans Schneider (609) Engineering Operations August 7, 2003 TF_JOINT_Final_Design_Review.ppt

Bob Marsala, Hans Schneider Engineering Operations 2 Voltage Drop Measurement Plan Instrumentation Must be Capable of the Following –Maintenance Testing Inject up to +/-220A into TF Coil and Measure the Voltage Drop at Every Joint –Operational Testing Measure the Voltage Drop at Every TF Joint During an Actual Shot at Up to 72KA –Common Computation or Resistance, Trending, Alarms, Warnings

Bob Marsala, Hans Schneider Engineering Operations 3 System Block Diagram EPICS R=V/I (at 72kA or 200A) Agilent 6671A 8V 1N A 200V Polarity Switching Relay Transorbs 450J 50kA 340V 200A 1 Ohm 275W Shunt 200A CAMAC CRATE 96 Channels ADC #24AWG Two Twisted Pair Teflon (1500V Between Conductors) Tefzel Outer Insulation (Spark Test to 10kV) Voltage Drop x 72 Strain x TBD Instrumentation Rack Manual Control Gain 72kA or 200A Two Twisted Pair Per Flag Shunt Voltage TF Power Supply Halmar Current Disconnect Switch

Bob Marsala, Hans Schneider Engineering Operations 4 TF Joint Voltage Measurement Components 2 Voltage Probes on Each TF Joint Cables from all Probes (144) to Racks Instrumentation Consisting of –Quick Disconnect Panel –Isolated Programmable Gain Amplifier –CAMAC Transient Digitizer 200 A Source Hardware and Switch

Bob Marsala, Hans Schneider Engineering Operations 5 TF Flag Joint Voltage Probes Two Probes per Joint 144 Potential Data Points Two Coax Probes To Measure Voltage Drop

Bob Marsala, Hans Schneider Engineering Operations 6 Probe Detail Probe Terminated in a SMB Connector Near Flag

Bob Marsala, Hans Schneider Engineering Operations 7 Cable Janor Wire & Cable Corp 2 Twisted Pairs per Cable with Overall Jacket –One TP for Each of the Two Probes on a Joint #24 Conductors ETFE Insulation 10KV Isolation from Conductor to Outer Jacket Terminations –Flag End: SMB Mating Cable Spliced to Cable –Rack End: 4 Pin Locking Tripeg Molex Connector

Bob Marsala, Hans Schneider Engineering Operations 8 Instrumentation Located in Two Racks on Midplane Level Consists of –Mother Boards (6) –Quick Disconnect (12) –Programmable Gain Isolation Amplifier (72) –CAMAC Crate with Transient Digitizers –Power Supplies –200A Source and Control

Bob Marsala, Hans Schneider Engineering Operations 9 Quick Disconnect Modules Channels Can be Quickly Disconnected from the Amplifiers 6 Channels (12 Probes) Serviced by each of 12 Disconnects Uses Properly Spaced Banana Jacks on Mother Board and Banana Plugs on Disconnect Module

Bob Marsala, Hans Schneider Engineering Operations 10 Quick Disconnect Banana Plugs Mother Board Disconnect Board Banana Jacks

Bob Marsala, Hans Schneider Engineering Operations 11 Programmable Gain Isolation Amplifier Amplifies and Isolates Voltage Across Joint 12 Boards per Mother Board, 6 Mother Boards = 72 Boards 5000V Isolation between Input and Output Two Gain Stages (Each having a Gain of 1, 10, 100 or 1k) followed by Unity Gain Isolation Amplifier Overall Gain from 1 to 1 Million Controlled by Two Rotary Switches on Control Panel –Nominal Gain: 100 for 72kA, 10,000 or 100,000 for 200A Board Designed to Measure Voltages from Both Probes of a Joint, but only Parts for One Probe are Installed (Cost)

Bob Marsala, Hans Schneider Engineering Operations 12 Summary 2 Voltage Probes on Each TF Joint Cables from all Probes (144) to Instrumentation Racks Quick Disconnects Provided to Open Probe to Amplifier Connections Capable of 72kA Operation or 200A Maintenance Operation One Probe from Each Joint is Monitored Isolation to 5000V CAMAC Data Acquisition EPICS Used for Calculations, Trending, Alarms and Warnings

Bob Marsala, Hans Schneider Engineering Operations 13 Resistance Measurement System Benefits All 72 Joints Monitored at 200A and 72kA –Manual 200A & Automated 72kA Measurements Expandable & Upgradeable –Measure All 144 Probes & Automate 200A Measurements CAMAC Digitizer Upgraded to PCI Digitizer –Addition of Strain Measurements Design Signal Conditioning/Amp/Iso Board Least Cost (M&S) and Effort (Manweeks) System –Combo Amp/Iso Board Designed and Being Tested –CAMAC Crate and 908 Digitizers Available

Bob Marsala, Hans Schneider Engineering Operations 14 Mother Board Each Mother Board Services 12 Joints (24 Probes) 6 Mother Boards Mounted in Rack –3 Accessible from Front of Rack and 3 from Rear –Expansion to 8 Mother Boards is Provided (Strain or Displacement) Only One Probe from a Joint is Actively Monitored –Capable of Expansion to Actively Monitor Both Probes Active Probe can be Selected by Plugging Cable Connector into a Second Connector on the Mother Board

Bob Marsala, Hans Schneider Engineering Operations 15 Mother Board

Bob Marsala, Hans Schneider Engineering Operations 16 Iso-Amplifier Schematic

Bob Marsala, Hans Schneider Engineering Operations 17 CAMAC Crate CAMAC Crate with Transient Digitizers Used to Store Voltage and Current Data EPICS Used to Calculate Resistance and for Trending/Status/Alarms Memory/Sample Rate TBD

Bob Marsala, Hans Schneider Engineering Operations 18 Programmable Gain Isolation Amplifier Layout Input Connector Input Resistors PG Amps Isolation Amp Buffer Opto Couplers DC/DC Conv Output and Control Connector 5000V Barrier

Bob Marsala, Hans Schneider Engineering Operations 19 Power Supplies All Programmable Gain Isolation Amplifiers Powered by +/- 15V Linear Supplies (2) for Ground Referenced Output and +24V Linear Supplies (2) for DC/DC Converters

Bob Marsala, Hans Schneider Engineering Operations A Supply and Control Supply –Agilent 6671A 8V Control and Protection –Current Programmed via Pot on Control Panel –Polarity Switching Relays Controlled from Control Panel –Interlock to Prevent Switching of Polarity while Current is Flowing in TF Coil –Protection Incase of Open Circuit Interlocked Switch to Apply 200A to TF Bus