ALD MCP 116 Life Test Update
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Transcript of ALD MCP 116 Life Test Update
J. McPhate – MCP 116 Life Test Update 1
ALD MCP 116 Life Test Update
• MCP 116 - 20µm pore, ANL functionalized, R = 31 MΩ•Single plate in phosphor screen detector on life test system•Pre-scrub imaging vs. voltage•Baked at 145°C for 48 hours (peak pressure 1e-4 torr, final pressure 4e-7 torr)•Post-bake imaging and “gain” vs. voltage•Start scrub 9/10/10, extracting ~140 days (~4.6 C/cm2)•Slow gain decrease (after initial drop and rise) continues•Intermediate imaging and gain vs. voltage at 0.43 C/cm2, 1.74 C/cm2, 3.05 C/cm2, and 4.07 C/cm2.•Video of flaring hot spots at 4.6 C/cm2.
25 January 2011
J. McPhate – MCP 116 Life Test Update 2
Relative Gain vs. Extracted Charge
25 January 2011
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.00%
20%
40%
60%
80%
100%
ALD MCP 116 Scrub Relative Gain vs. Extracted Charge, as of 1/22/11
Extracted Charge (C/cm2)
Rela
tive
Gain
J. McPhate – MCP 116 Life Test Update 3
Photocurrent vs. Voltage(same as 1/11/11)
25 January 2011
0 200 400 600 800 1000 1200 1400 16000.01
0.1
1
10
100
1000
10000
"Gain" vs. Voltage, ALD MCP 116 Life TestTwo Bare Penray Lamps
QExt = 0.00 C/cm2
QExt = 0.43 C/cm2
QExt = 1.74 C/cm2
QExt = 3.05 C/cm2
QExt = 4.07 C/cm2
MCP HV (volts)
Corr
ecte
d Ph
otoc
urre
nt (n
A)
Little change in curves over last three measurements
J. McPhate – MCP 116 Life Test Update 4
Background Hot Spots
25 January 2011
• VMCP = -1400V• VScreen = +3000V• UV light off• 30 second exposure (deep)
• New hot spots continue to develop• Hot spot activity seems to be sporadic, with some blinking on and off, others changing brightness•Hot spots largely associated with substrate gaps and voids.•Flaring of hot spots is the cause of spiky current observed
J. McPhate – MCP 116 Life Test Update 5
Spiky Scrub Current
25 January 2011
Captured a scope traces of a smaller spikes, like one of these.
1µA
0 µA
Video captured of flaring hotspots when active like this.
J. McPhate – MCP 116 Life Test Update 6
Current Transients
• Scope snaps of small spikes captured.• Correlation between chart recorder behavior and
scope traces seems to indicate larger spikes are simply more sustained behavior – rather than higher current.
• Imaging and video acquired during significant outburst.
• See associated video files on the blog.
25 January 2011
J. McPhate – MCP 116 Life Test Update 7
Scope Trace from Small Spike
25 January 2011
J. McPhate – MCP 116 Life Test Update 8
Image During Outburst Mode
25 January 2011
•Previously unseen hot spot on a multi-fiber boundary
•Very erratic
•Very bright compared to other hot spots and the rest of the image
•Video captured of this hot spot flaring
•Destroyed phosphor screen during a particularly strong outbursts (caught on video).
J. McPhate – MCP 116 Life Test Update 9
Phosphor Damagefrom Hot Spot Outburst
25 January 2011