1. ALD MCP 116 Life Test Update
MCP µm 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
J. McPhate – MCP 116 Life Test Update

3. Photocurrent vs. Voltage (same as 1/11/11)
Little change in curves over last three measurements
25 January 2011
J. McPhate – MCP 116 Life Test Update

4. J. McPhate – MCP 116 Life Test Update
Background Hot Spots
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
25 January 2011
J. McPhate – MCP 116 Life Test Update

5. J. McPhate – MCP 116 Life Test Update
Spiky Scrub Current
1µA
Captured a scope traces of a smaller spikes, like one of these.
Video captured of flaring hotspots when active like this.
0 µA
25 January 2011
J. McPhate – MCP 116 Life Test Update

6. J. McPhate – MCP 116 Life Test Update
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
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).
25 January 2011
J. McPhate – MCP 116 Life Test Update

9. Phosphor Damage from Hot Spot Outburst
25 January 2011
J. McPhate – MCP 116 Life Test Update