Fabien Jeanneau On the behalf of HLLHC team in Saclay Detector types Standard bulk detector 1mm pitch 128 µ m gap CLK 2 MΩ prepreg 75µm bulk Grounding by ID: 505237
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Slide1
Sparks study
Fabien
Jeanneau
On the behalf of
HL-LHC team in
SaclaySlide2
Detector types
Standard bulk detector (1mm
pitch, 128 µ
m
gap)
CLK
(2 MΩ/
☐
) +
prepreg
(75µm) + bulk:
Grounding by
vias
Resistive strips (ink ~100
kΩ
/
☐
) + bulk:
1 mm pitch
0,5 mm pitch
Joerg
-like detectors:
250 MΩ along the strips
30 MΩ between resistor and ground Slide3
Setup
Measurement through a 1MΩ resistor
Detector divide in four parts
Sparks triggered by an alpha source
HV
drift = -450 VHVmesh up to sparks arising
///
///
///
///
1M
Ω
OscilloscopeSlide4
Standard prototype
Sparking HV
-330 V
Current
~ few µASlide5
Carbon-loaded
Kapton
type
Sparking HV
-380 VCurrent
< 500 nA
50 V difference !!Slide6
Resistive strips
Sparking HV
-340 V
Current
< 500
nASlide7
Joerg-like prototype
Sparking HV
-350 V
-350 V
Current < 50 nA
-360 V
Current < 100 nA
-370 V
Current < 300 nA
HV = -350 VSlide8
HV = -360 VSlide9
HV = -370 VSlide10
Comparison
Detector type
Sparking
HV
Released
charge
PS CurrentStandard
-330 VFew tens nC
Few µACLK-380 V
0,5 nC< 500
nAResistive strips-340 V
Few nC< 500 nA
Joerg-like-350V< 0,2
nC< 300 nA