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20 cm and 33mm MCP Test Progress

20 cm and 33mm MCP Test Progress. Lifetest with #164/163 continues – now close to 2 C cm -2 New batch of 33mm test MCPs arrived Chem-3 first tests begun Need to choose MCPs for next lifetests : - Bake , and scrub with a pair of the new MCPs

mervyn
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20 cm and 33mm MCP Test Progress

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  1. 20 cm and 33mm MCP Test Progress • Lifetest with #164/163 continues – now close to 2 C cm-2 • New batch of 33mm test MCPs arrived • Chem-3 first tests begun • Need to choose MCPs for next lifetests:- • Bake, and scrub with a pair of the new MCPs • Find out if air exposure affects post bake/scrub SEE • Investigate temp stability of gain • Evaluate background sources • No new 20cm MCP data – awaiting new MCPs • Have made changes to 20cm detector to improve • imaging for next set of tests. • Continue to electrode for 20cm MCPs, 2 more coming

  2. ALD Chem 3, 20µm Microchannel Plates 12317-120/117, 50MΩ/180MΩ, Pair with 0.7mm gap/400v 900v on each MCP, gain high, >107. Numerous black spot defects, lots of bright spots due to removed/missing ALD layer exposing electrode material. Cleanliness issues? Gain map, multifiber pattern modulation, typical of 12317 boule material with pore size variations. Not a good substrate material.

  3. Chem-3 ALD 20µm Microchannel Plate Previous data on 12317 boule 20 µm pore #160 ALD MCP with NiCrelectrode . 12317-120/117 Chem-3 background 100 sec background, ~4 events cm-2 sec-1. Some hot patches, uniform background rate is 3.5 events cm-2 sec-1 ----not very good. #160, 12317-113, 700v MCP, earlier data shows problems with this material

  4. ANL ALD-MCP Samples Started with Chem-3 12137 boule has bad pore stacking uniformity 11863 boulehas good pore stacking uniformity 12258 boule is unknown 11863-88

  5. Preconditioning Test of 33mm 20µm Pore MCPs ANL MCPs 164 and 163, 20µm, 60:1, 8° bias. INCOM serial #s, 11863-99, 11863-95 Resistances 159MΩ, 138MΩ (NiCr over) XDL detector with MCPs gapped by 0.001” spacer. Completed 350°C bake, with RGA scans. Scrub in progress, with RGA scans. Have gone from 1µA to 2µA, now 3µA >1.9 C cm-2 extracted.

  6. MCP 164-163 Scrub Record Almost all of the gain variation is due to thermal changes in the lab Scrub @ 3 x 105 gain, 700v per MCP

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