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