TPB coatings at TEVSCSCC Wil Vollenberg CERN TEVSCSCC

TPB coatings at TE-VSC-SCC Wil Vollenberg CERN TE-VSC-SCC wil. vollenberg@cern. ch Co-workers: Pedro Costa Pinto ; Mauro Taborelli ; Benoit Teissandier 02 -12 -2015; WA 104 weekly meeting Wil Vollenberg

Contents: - Coating activities at TE-VSC-SCC - our experience in TPB coatings - our commitment in WA 104 project 02 -12 -2015; WA 104 weekly meeting Wil Vollenberg

DC Magnetron sputtering planar configuration 02 -12 -2015; WA 104 weekly meeting Wil Vollenberg

Equipment in our labs DMS DC Magnetron sputtering planar configuration Ø 600 mm After bake: 2*10 -9 mbar 2 magnetrons Ø 150 mm (3 DC cathodes) up to 5 objects Ø 120 mm: +/- 10 % Flexibility 02 -12 -2015; WA 104 weekly meeting Wil Vollenberg

Equipment in our labs Examples DMS Nb coating for HIE-Isolde Tuning plates NEG on MCP C coating on electrodes for low SEY 02 -12 -2015; WA 104 weekly meeting B 4 C on mylar for n. TOF Wil Vollenberg

Equipment in our labs DC Magnetron sputtering planar configuration Ø 1450 mm !! No Bake Plimit= 5*10 -7 mbar 2 magnetrons Ø 150 mm rotated object holder Ø 1200 mm: +/- 10 % Flexibility 02 -12 -2015; WA 104 weekly meeting Wil Vollenberg

Equipment in our labs NEG on foils for WITCH Cu conductive coating TCDS 02 -12 -2015; WA 104 weekly meeting Examples MP 1500 NEG on electrodes Gas ionisation BPM Nb on Cavity Asacusa Wil Vollenberg

Magnetron DC Plasma coating in cylindrical configuration 02 -12 -2015; WA 104 weekly meeting Wil Vollenberg

Equipment in our labs DC Diode cylindrical configuration RF ceramic windows (LEP-LHC-ESRF) Pick-ups (CTF 3 – linac 2) 02 -12 -2015; WA 104 weekly meeting Wil Vollenberg

LSS coating system Solenoid L=8 m f=60 cm manifold 3 mm wires of Ti, Zr and V Extensions + chambers From: Pedro Costa Pinto 02 -12 -2015; WA 104 weekly meeting

Our experience in TPB coating: - end 2007 /begin 2008 first TPB tests for ICARUS / WARP - by spray-technique or evaporation - evaporation in units of PH division - work done by “surface and coating” section. 02 -12 -2015; WA 104 weekly meeting Wil Vollenberg

COATING SET-UP 2007 -2008 x-tal 26 cm sample shutter d Mo boat Ø 30 cm Volume tank 50 l Turbo pump: 300 l/s Plimit = 1. 5*10 -7 Torr (24 h pumping) Deposition rate: 1 µg/cm 2/s P during coating: below 10 -6 Torr Sample production 3*3 cm 2 P. E. foils / quartz Delta mass => density 02 -12 -2015; WA 104 weekly meeting Wil Vollenberg

Sample TPB coating 2007 -2008: - Samples: Mylar foil and quartz plates - TPB 110 – 1460 µg/cm 2 02 -12 -2015; WA 104 weekly meeting Wil Vollenberg

Results TPB coating 2007 -2008 (F. P. ): on mylar samples 3*3 cm 2 - 100 µg/cm 2: 2. 2 -2. 7 p. e / ke. V - 200 -300 µg/cm 2: 2. 7 -2. 9 p. e / ke. V - 600 µg/cm 2: 2. 2 -2. 4 p. e / ke. V p. e. : photo electron / ke. V !? 2015: tests are ongoing !! => Maura 02 -12 -2015; WA 104 weekly meeting Wil Vollenberg

Sample TPB coating 2007 -2008: - SEM: for 110 µg/cm 2 : not continuous layer for thicker layers: O. K. - SEM after thermal cycles (liquid Nitrogen) up to 5 cycles: no change in morphology neither peel off observed 02 -12 -2015; WA 104 weekly meeting Wil Vollenberg

2015 TPB coatings for WA 104 ICARUS: according to commitment: EDSM 1531005: collaboration of TE-VSC: - pumping system - support during re-installation - technical guidance during commissioning: testing / prototyping - technical assistance and quality assessment during production phase. 02 -12 -2015; WA 104 weekly meeting Wil Vollenberg