Status of SRF at DESY Marc Wenskat (on behalf on many!) TTC HG - PowerPoint PPT Presentation

Status of SRF at DESY Marc Wenskat (on behalf on many!) TTC HG Meeting 17.11.2016

Outline > Comissioning of Dry Ice Cleaing of 9 cell structures > Nitrogen treatment of single cell & 9 cell cavities Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 2

Dry Ice Cleaning > New set up for 9 cell and TDR structures > Two 9 cell cavities were used to commission it  CAV518 – quench at 22 MV/m  CAV627 – after storage 33 MV/m & strong FE > After dry ice cleaning  CAV518 – 5MV/m @ 3x10 8 & low FE  CAV627 – 14 MV/m @ 1.2x10 9 & high FE > Most likely due to wrong handling during assembly > Both will now undergo second dry ice cleaning and re-test Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 3

Nitrogen treatment > 3 single cells in preparation  1DE18 FG qualified (QvsT & QvsE at different T) and ready  1DE17 FG in the insert at the moment  1DE21 LG qualified (QvsT & QvsE at different T) BD at 23MV/m (previous 49 MV/m) > Optical inspection of 1DE21 showed strange black spots at equator & iris Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 4

1DE21 Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 5

1DE21 Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 6

Status Furnace > V = 1800 x 625 x 660 mm³ > 2 turbo molecular pumps ( Varian, 6000 l/s each , max. intake pressure ~ 10 -2 mbar) > T max ~ 1400°C Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 7

Status Furnace > RGA is working > No leak > Flow controller needed adjustment (done) Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 8

Status Furnace > Test run next week  400°C instead 800°C for 2h (time saving)  Important part is cool down and stable at 120°C and  Inject 25 mTorr N 2 at 120°C (operational pressure limit of turbo molecular pumps & heat could (??) damage pumps) > Mobile clean room is ready > Niobium caps undergo BCP at the moment Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 9

Samples @ Nanolab > Dedicated research on single crystal samples ongoing > Infusion recipe and in-situ analysis with XRR and XRD methods > Details will be published soon Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 10

The Setup > Nb(100) single crystal > UHV Mobile chamber – P ~ 5.10 -10 mbar > Mounted in a Six-Circle diffractometer (Cu source) Sample: 10 mm wide 4 mm thick Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 11