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Resistor Divider Chain With Beam Plug Cheng-Ju Lin LBNL HV Test @ - PowerPoint PPT Presentation

Resistor Divider Chain With Beam Plug Cheng-Ju Lin LBNL HV Test @ PC4 Weekly Meeting 18-Aug-2016 We (Glenn, Bo, Thomas, and I) have been finalizing the resistor values for the FC voltage divider Preference is to use two parallel paths


  1. Resistor Divider Chain With Beam Plug Cheng-Ju Lin LBNL HV Test @ PC4 Weekly Meeting 18-Aug-2016

  2. • We (Glenn, Bo, Thomas, and I) have been finalizing the resistor values for the FC voltage divider • Preference is to use two parallel paths of 1G ! resistors for the nominal FC • For stage 2 test, the resistor divider of the beam plug is tied to field cage profile # 5 • Need to compensate the divider network to maintain the nominal voltage drop of 3kV across all profiles • Instead of replacing the nominal boards, we (Glenn’s idea) plan to attach a second resistor divider board in parallel with the nominal board for the first 5 profiles near the CPA

  3. ProtoDUNE RESISTOR DIVIDER CHAIN CPA Field Shaping 178.5kV FC0 FC1 FC2 FC3 FC4 FC5 FC6 FC7 FC8 FC9 FC10 FC20 FC30 FC40 FC50 FC58 APA -180kV -177kV -174kV -171kV -168kV -165kV -162kV -159kV -156kV -153kV -150kV -120kV -90kV -60kV -30kV -6kV GND … … … … … R2 R3 R3 R3 R3 R4 Rf R1 R1 R2 R2 R2 R3 R3 R3 R3 R3 R3 … … … … … R1 R1 R2 R2 R2 R2 R3 R3 R3 R3 R3 R3 R3 R3 R3 R3 R4 Rf Vf (-1.5kV) R6 R6 R5 R6 R6 Main resistor board: Parallel resistor R1 R2 R3 R4 Rf Beam board VALUE (M ! ) 500 1000 1000 1500 500 R7 R7 Plug CURRENT ( " A) 3.0 3.0 3.0 3.0 3.0 R7 R7 Parallel resistor board (when beam plug is installed): R7 R7 R5 R6 VALUE (M ! ) 800 800 R7 R7 CURRENT ( " A) 3.7 3.7 R7 R7 Beam plug resistor chain: R7 Total Current Draw = 9.6 " A R7 R7 VALUE (M ! ) 15000 C.-J. Lin 18-Aug-2016 CURRENT ( " A) 1.8

  4. RESISTOR DIVIDER CHAIN CPA Field Shaping 178.5kV FC0 FC1 FC2 FC3 FC4 FC5 FC6 FC7 FC8 FC9 FC10 FC20 FC30 FC40 FC50 FC58 APA -180kV -177kV -174kV -171kV -168kV -165kV -162kV -159kV -156kV -153kV -150kV -120kV -90kV -60kV -30kV -6kV GND … … … … … R2 R3 R3 R3 R3 R4 Rf R1 R1 R2 R2 R2 R3 R3 R3 R3 R3 R3 … … … … … R1 R1 R2 R2 R2 R2 R3 R3 R3 R3 R3 R3 R3 R3 R3 R3 R4 Rf Vf (-1.5kV) R6 R6 R5 R6 R6 Parallel resistor Beam board Ideal resistor value for R5 and R6 is 818 M ! R7 R7 Plug Using stock value of 800 M ! , the resulting voltage drops are: R7 R7 R1 R2 R3 R4 Rf R7 R7 VOLTAGE DROP (V) 1488 2976 3002 4403 1501 27519 R7 CURRENT ( " A) 3.0 3.0 3.0 3.0 3.0 1.8 R7 R7 R7 R7 Voltages are within ~1% of the nominal values R7 R7 C.-J. Lin 18-Aug-2016

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