QAQC CEA SACLAY Electrical Properties SITE VISIT JUNE

QA/QC @ CEA – SACLAY Electrical Properties SITE VISIT – JUNE 2017 01/06/2017 | Esther, Maxence, Arnaud, Fabien, Alan, Luc and Christos

CONTENTS Tooling & Procedures: Tooling Mesh ‘toaster’ Configuration: Drift, RO and Drift+RO M 0 feedback Problems and treatment Quest of pillars detection RO panels results C. Lampoudis, CEA-Saclay Site Visit , 01 -06 -2017

TOOLING Tools used during the HV control • Multimeter(s) to control continuity and resistivity. • Toaster (128μ pillars) to ‘grill’ a drift panel mesh. • ‘Portable’ small mesh. • Power supply (CAEN). • Vertical assembly tool. C. Lampoudis, CEA-Saclay Site Visit , 01 -06 -2017

MESH ‘TOASTER’ To eliminate any unwanted ‘material’ on mesh Trapezoid shape with dense pillar pattern. Pillar height of 128μm. Slow ‘Grilling’ - up to 450 V. rk o w g n oi g n o C. Lampoudis, CEA-Saclay Site Visit , 01 -06 -2017

CONFIGURATION To control HV behavior of panels (monitor current) HV on drift cathode (without mesh). HV on drift cathode (with mesh). HV on RO resistive strips (copper strips grounded). HV on RO resistive strips + ‘Portable’ mesh (grounded). Drift+RO sandwich: HV on resistive strips (mesh grounded). C. Lampoudis, CEA-Saclay Site Visit , 01 -06 -2017

PROBLEMS AND TREATMENT Main issues related to PCB quality, cleanliness and construction Presence of dust and dirt. Missing pillars. STYCAST glue on RC filter. Araldite on drift cathode in the proximity of mesh frame (? ). Treatment Thorough washing and drying of panels + Mesh ‘toaster’ UV flash-light and Kapton passivation. By-pass RC filter. Adopt construction according to the electrical test feedback. Macro-passivation RC filter by-passed C. Lampoudis, CEA-Saclay Site Visit , 01 -06 -2017

MISSING PILLARS Missing pillars issue Difficulty to spot. Handling the panels may cause further damage on the pillars(? ). Best results: ‘by eye’. Absolute results: ‘by eye’ using UV flashlight. C. Lampoudis, CEA-Saclay Site Visit , 01 -06 -2017

M 0 FEEDBACK M 0 under electrical controls since 04/2017 Large sectors are not promising. Numerous missing pillars. Small active zones are operational. Further ongoing investigation. 7 LS 1 -4 8 LS 2 -3 9 LS 3 -4 LS 4 -1 10 11 LS 5 -1 Canal HT 1 2 3 5 6 M 0 STEREO FACE B e c a F o e r Ste ir’ a n o ‘ B 1000 V 200 1000 @ t +5 min 150 I (n. A) STEREO Face B 1000 V @ t +3 h 100 50 0 0 1 2 3 4 5 6 7 HV Channel 8 9 10 11 C. Lampoudis, CEA-Saclay Site Visit , 01 -06 -2017

M 0 RESULTS (ETA A) ETA RO panel face A no issues detected ‘on air’. few missing pillars. 2 5 7 1 3 6 9 8 11 10 Channel Voltage(V) I(μA) 1 750 0, 01 2 750 0 3 750 0, 003 5 750 0, 005 6 750 0, 001 7 750 0, 012 8 750 0, 009 9 750 0, 011 10 750 0, 01 11 750 0, 025 e c a AF T E ir’ a n o ‘ A C. Lampoudis, CEA-Saclay Site Visit , 01 -06 -2017

M 0 RESULTS (ETA A+DRIFT) ETA RO panel face A+Drift large sectors non-operational. Kapton on missing pillars. A 2 1 B 5 7 9 11 3 6 C Area Size(cm²) A fully open B fully open C 35*45 Channel Voltage(V) I(μA) 1 600 0, 22 2 600 2, 4 3 600 1 5 600 3, 5 6 600 1, 3 7 600 0, 36 8 600 0, 085 9 600 0, 011 10 600 0, 003 11 600 0, 01 8 10 A e c Fa A ET 2 # t f ri D + C. Lampoudis, CEA-Saclay Site Visit , 01 -06 -2017

M 0 RESULTS (ETA B) ETA RO panel face B no issues detected ‘on air’. numerous missing pillars. 2 5 1 3 7 6 9 8 11 10 Channel Voltage(V) I(μA) 1 750 0, 015 2 750 0, 023 3 750 0, 017 5 750 0, 02 6 750 0, 154 7 750 0 8 750 0, 013 9 750 0, 016 10 750 0, 009 11 750 0, 024 ace F A ET ir’ a n o ‘ B C. Lampoudis, CEA-Saclay Site Visit , 01 -06 -2017

M 0 RESULTS (ETA B+DRIFT) ETA RO panel face B+Drift Channel several zones operational. kapton on missing pillars. 2 7 11 F t=10 min t=60 min 750 0, 015 0, 012 0, 009 2 750 0, 036 0, 028 0, 03 3 750 0, 16 0, 075 0, 018 5 750 0, 052 0, 084 0, 15 6 750 0, 27 0, 116 0, 208 7 750 0, 24 0, 07 0, 086 3 8 750 0 0 0, 115 9 750 0 0 2 D 10 750 5 4, 4 2, 6 11 750 0, 3 1, 6 0, 055 1 E 9 t=0 min A C I(μA) 1 B 5 Voltage(V) 6 8 G 10 Area Size(cm²) A 30*20 B 40*25 C 30*30 D 20*20 E 50*30 F 20*20 G 20*30 B e c Fa A ET 1 # t f ri D + C. Lampoudis, CEA-Saclay Site Visit , 01 -06 -2017

SUMMARY M 0 gained experience. All drift panels tested (3 external + 1 central). Both Stereo and ETA RO panels were thoroughly tested w/wo drift+mesh. Non-satisfactory behavior of the RO panels. Further ongoing investigation. Use of toaster to ‘purify’ mesh on drift panels. C. Lampoudis, CEA-Saclay Site Visit , 01 -06 -2017

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