1. Update on Channel Plate Testing B. Adams, K. Attenkofer, M. Chollet, Z. Insepov, J. McPhate, O. Siegmund, D. Walters, M. Wetstein, Z. Yusof for the LAPPD Collaboration

2. LAPPD Collaboration: Large Area Picosecond Photodetectors 10/24/2015Weekly Meeting2 Completed MCP Holder

3. LAPPD Collaboration: Large Area Picosecond Photodetectors 10/24/2015Weekly Meeting3 Completed B’ Flange

4. LAPPD Collaboration: Large Area Picosecond Photodetectors 10/24/2015Weekly Meeting4 B’ Flange Schematic

5. LAPPD Collaboration: Large Area Picosecond Photodetectors 10/24/2015Weekly Meeting5 Status of First MCP Measurements Good news: No sparking or overload Resistance measured with multimeter consistent with Jeff, Qing, and Anil’s IV curves. Work needed: Resistance is unstable with Voltage Dropped rapidly and first. Slowly drifted up and down around a somewhat steady-state much lower than the value measured by the multimeter. Pressure more than doubled from 1.2e-5 to 3e-5 when HV applied. We’re effectively baking something off. Resistances of two plates are too different to achieve multiplication on both at the same time, without biasing the middle. Newly updated setup will allow us to bias the two plates separately. Turbo- pump is now “contamination-free”. Vacuum is in the low 10e-7 range. Next pair will be pre-baked and have closer matching resistances.

6. LAPPD Collaboration: Large Area Picosecond Photodetectors 10/24/2015Weekly Meeting6 Future Plans: Near Term Complete a publishable first test-measurement by mid-January, comparing amplification, pulse height distributions, mean transit time, and TTS for: Conventional MCP Conventional MCP + ALD Functionalized Borosilicate First meeting to sync results between testing and simulation group. Start on the text of the paper.

7. LAPPD Collaboration: Large Area Picosecond Photodetectors 10/24/2015Weekly Meeting7 Future Plans: Long Term Final B-flange design almost done…

8. LAPPD Collaboration: Large Area Picosecond Photodetectors 10/24/2015Weekly Meeting8 Future Plans: Long Term Systematic study of many channel plate variations Focus on what we can do well: Precision timing Strip-line based measurements Start looking into glass boards Start looking into integrating the chip Field emission studies for photo-cathode development Broader integration with the photocathode effort

9. LAPPD Collaboration: Large Area Picosecond Photodetectors 10/24/2015Weekly Meeting9 B’ Flange Schematic To be adapted for field enhancement studies

10. LAPPD Collaboration: Large Area Picosecond Photodetectors 10/24/2015Weekly Meeting10 Setup for Field Enhancement Study

11. LAPPD Collaboration: Large Area Picosecond Photodetectors 10/24/2015Weekly Meeting11 Setup for Field Enhancement Study Laser enters back of flange through glass window Cables connect to feedthroughs in the chamber above.. Gaps between striplines on glass board left transparent, so laser can pass through MCP holder also used for sample