Space Sciences Laboratory, University of California, Berkeley

Arradiance ALD/Incom MCPScrub and Life Test

• Incom substrate

• 40µm pores, 8 deg bias, 40:1 L/D• Sent to Arradiance for resistive and emissive layer application + electrode• Resistance approx 750 MΩ in vacuum• Arradiance tests show 50,000 gain @ 1000v• Tested as a single MCP + Phosphor

Space Sciences Laboratory, University of California, Berkeley

Arradiance ALD/Incom MCP Test

550v

1000v background, no obvious

hotspots other than phosphor defects

Bright scratch on phosphor

UV light

Space Sciences Laboratory, University of California, BerkeleyArradiance ALD/Incom MCP Lifetest

10 m pore NO LEAD glass substrate,

40:1 L/D, Bias = 880V,

Iout~0.4 pA/pore, gain under electron bombardment

Tremsin - LAPD workshop

0

0.2

0.4

0.6

0.8

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1.2

0 0.01 0.02 0.03 0.04 0.05

Dose (C/cm2)

Gain

Commercial MCPArradiance emissive film onlyArradiance Conductive & Emissive films

Arradiance, Inc.

Starts at Bias = 700V, gain x1000, 0.6µA,

change to 880v, 0.8µA at 0.03C/cm2

25mm 40µm 40:1 ALD MCP, UV scrub

Note: no vacuum bake

SSL-UCB

Space Sciences Laboratory, University of California, Berkeley

“Low” Gain Images

Post-Scrub VMCP = 700VPre-Scrub VMCP = 550V

Note that the camera used for post scrub imaging was much higheroptical resolution, so differences are exaggerated

Space Sciences Laboratory, University of California, BerkeleyPre & Post Scrub Histograms at “low” gain Note that the camera used for post scrub

imaging was much higher

optical resolution, so differences are exaggerated

Post-Scrub Cross-Section: VMCP = 700V

Pre-Scrub Cross-Section: VMCP = 550V

Space Sciences Laboratory, University of California, Berkeley

“High” Gain Images

Post-Scrub VMCP = 1100VPre-Scrub VMCP = 900V

Note that the defects are present before and after thescrub, most likely dust, and may have charged up topresent the bright rings only when light is turned on!

Space Sciences Laboratory, University of California, Berkeley

Pre & Post Scrub Histograms at “high” gain

Post-Scrub Cross-Section: VMCP = 1100V

Pre-Scrub Cross-Section: VMCP = 900V

Space Sciences Laboratory, University of California, Berkeley

Pre-Scrub Close-Up• 40µm pores visible

• We can see the Hex boundary distortions are uneven

• 800v MCP

• 2900v screen

Post scrub at 800v

Space Sciences Laboratory, University of California, Berkeley

Post-Scrub Close-Up

• 40µm pores still visible but are now narrow spots.

• Hex boundary distortions are washed out

• 1100v MCP

• 2900v screen

• Former dead spots now have bright halos at high gain

Space Sciences Laboratory, University of California, Berkeley

Background Images

Post-Scrub VMCP = 1100VPre-Scrub VMCP = 1000V

No significant changes

Space Sciences Laboratory, University of California, BerkeleyPost-Scrub response at higher gain

VMCP = 600V VMCP = 700V VMCP = 800V

VMCP = 900V VMCP = 1000V VMCP = 1100V

Modulation seems more related to applied voltage - not gain.