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PMT HV Base Prototypes Evaluation
Instrumentation WorkshopLBNL
July 23-24, 2003
Nobuyoshi KitamuraUniversity of Wisconsin-Madison
SSEC
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Three prototypes
“Old Iseg”—Aug. 2002 prototypes
“New Iseg”—Split ground implemented.
“EMCO”—Passive base approach consisting of three components:Passive base, HV generator, & digital interface.
N. Kitamura 7/23/2003
Jumper pads
Jumper pads
Ribbon connector
Digital interface board
HV generator
Passive base
All designs present the same interface to DOMMB.
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New Iseg--Isolated Ground
Data by John Kelly(hv_2000_iseg_psl.pdf)
Output voltage is unstable with no ground-connecting jumper
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Data by John Kelly(hv_3000_iseg_049.pdf)
New Iseg with a 1M Jumper
The output voltage is stabilized by installing a jumper.
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Connecting Grounds with a Zero Jumper
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Connecting Grounds with a 1M Resister
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Noise Introduced by Digital Communication
This example shows noise from reading the ADC on a new Iseg base with a 1M jumper.
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ISEG OLD ISEG NEW EMCO
NOISE AT OUTPUT*
mVpp 1.22 ± 0.13 1.26 ± 0.13 1.12 ± 0.21
Vrms 214 ± 18 208 ± 18 215 ± 31
*At 50 oscilloscope input using a 50 cable. 100 nsec window (400 pts.)The scope background is 1mVpp, 190Vrms over 100 nsec.
Noise Comparison
All the bases have similar random noise levels observed at the secondary side of the signal coupling transformer.
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POWER
CURRENT (+5V)
CURRENT (-5V)
Power Dissipation
“” disableHV
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Transient Power
ISEG OLD
ISEG NEW
EMCO0.5V, 50nsec
Enable after setting DAC to 4095.Measure across 1Trigger on “enableHV”
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?
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Overall Comparison of the Three Prototypes
ISEG OLD ISEG NEW EMCO
NOISE AT OUTPUT*
mVpp 1.22 ± 0.13 1.26 ± 0.13 1.12 ± 0.21
Vrms 214 ± 18 208 ± 18 215 ± 31
1ST DYNODE VOLTAGE FIXED (600V) SCALE WITH OUTPUT
POWER AT MAX OUTPUT (mW) 130 280 250
COST (US$) ~150 ~260 ~600
*At 50 oscilloscope input using a 50 cable. 100 nsec window (400 pts.)The scope background is 1mVpp, 190Vrms over 100 nsec.
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Conclusion
N. Kitamura 7/23/2003
Old Iseg or New Iseg?New Iseg with isolated grounds performs badlyNew Iseg with directly connected grounds performs badlyNew Iseg with 1M jumper performs very similarly to Old IsegOld Iseg is cheaper than New IsegOld Iseg consumes less power then New Iseg
Old Iseg
Iseg or EMCO?Both have similar noise levelsVdy1 is fixed in Iseg approachIseg is cheaper than EMCO
Iseg