space sciences laboratory, university of california, berkeley arradiance ald/incom mcp scrub and...
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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
1
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.