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

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Feb 14, 2023 243 likes •303 views

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

SLIDE 1

Resistor Divider Chain With Beam Plug

Cheng-Ju Lin LBNL HV Test @ PC4 Weekly Meeting 18-Aug-2016

SLIDE 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

SLIDE 3

FC0

180kV

FC1

177kV

CPA Field Shaping 178.5kV R1 R1 R1 R1 FC2

174kV

R2 R2 FC3

171kV

R2 R2 FC4

168kV

R2 R2 FC5

165kV

R2 R2 FC6

162kV

R3 R3 FC7

159kV

R3 R3 FC8

156kV

R3 R3 FC9

153kV

R3 R3 FC10

150kV

R3 R3 R7 R7 R7 R7 R7 R7 R7 R7 R7 R7 R7 R7

Beam Plug

R3 R3 FC20

120kV

… …

FC30

90kV

… …

FC40

60kV

… …

FC50

30kV

… …

R3 R3 R3 R3 R3 R3 FC58

… …

R3 R3 Rf Rf APA GND

ProtoDUNE RESISTOR DIVIDER CHAIN

R1 R2 R3 R4 Rf VALUE (M!) 500 1000 1000 1500 500 CURRENT ("A) 3.0 3.0 3.0 3.0 3.0

Main resistor board: C.-J. Lin 18-Aug-2016

R5 R6 VALUE (M!) 800 800 CURRENT ("A) 3.7 3.7

Parallel resistor board (when beam plug is installed):

Vf (-1.5kV) R4 R4

R7 VALUE (M!) 15000 CURRENT ("A) 1.8

Beam plug resistor chain:

R5 R6 R6 R6 R6

Total Current Draw = 9.6 "A Parallel resistor board

SLIDE 4

FC0

180kV

FC1

177kV