SLIDE 1
Status of SRF at DESY
Marc Wenskat (on behalf on many!) TTC HG Meeting 17.11.2016
Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 2
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 - - 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 |
SLIDE 2
SLIDE 3
Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 3
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 @ 3x108 & low FE
- CAV627 – 14 MV/m @ 1.2x109 & high FE
> Most likely due to wrong handling during assembly > Both will now undergo second dry ice cleaning and re-test
SLIDE 4
Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 4
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
SLIDE 5
Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 5
1DE21
SLIDE 6
Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 6
1DE21
SLIDE 7
Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 7
Status Furnace
> V = 1800 x 625 x 660 mm³ > 2 turbo molecular pumps ( Varian, 6000 l/s each , max. intake pressure ~ 10-2 mbar) > Tmax ~ 1400°C
SLIDE 8
Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 8
Status Furnace
> RGA is working > No leak > Flow controller needed adjustment (done)
SLIDE 9
Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 9
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 N2 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
SLIDE 10
Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 10
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
SLIDE 11
Marc Wenskat | LCWS2016 | 7.12.2016 | Seite 11
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