O. Siegmund 11/15/11

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

O. Siegmund 11/15/11 2

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.

ALD Chem 3, 20µm Microchannel Plates 12317-120/117, 50MΩ/180MΩ, Pair with 0.7mm gap/400v

O. Siegmund 11/15/11 3

#160, 12317-113, 700v MCP, earlier data shows problems with this material

20 µm pore #160 ALD MCP with NiCr electrode .

Chem-3 ALD 20µm Microchannel Plate

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.

12317-120/117 Chem-3 backgroundPrevious data on 12317 boule

O. Siegmund 11/15/11

ANL ALD-MCP SamplesStarted with Chem-312137 boule has bad pore stacking uniformity11863 boule has good pore stacking uniformity12258 boule is unknown

11863-88

O. Siegmund 11/15/11

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.

O. Siegmund 11/15/11 6Scrub @ 3 x 105 gain, 700v per MCP

MCP 164-163 Scrub Record

Almost all of the gain variation is due to thermal changes in the lab