Vertical Test Area RF qualification of C100 cavities for 12 GeV project

Mircea Stirbet

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011

CERN – Geneva Switzerland

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

CHL-2

New cryomodules get new rf zones

CEBAF 12 GeV Upgrade

New cryomodules: 10Voltage per cryomodule: 108 MV avg.Cavities per cryomodule 8Heat budget: @ 2.07 K 300 W / CM 29 W / cavity, avg.Cavity: 1.497 GHz

0.7 m “Low loss” cell shapeHigher order mode damping: - Transverse (R/Q)Qk < 2.4 x 1010 Ω/m- Longitudinal (R/Q)Q < 6.5 x 1011 Ω /m

Key Project Parameters

Principles

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

- All cavities (R100 and C100) for 12 GeV project should be qualified in Vertical Test Area (VTA) before being string assemble.

- VTA tests will be done on cavities with or without He vessels.

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

State-of-the-art production SRF cavity

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Inventory Receipt Visual Inspection

Dimensional Receipt

Inspection via CMM

RF Receipt Inspection

Ultrasonic Clean1 hour at 120FDI+Liquinox

Heat Treatment 10 hours at 600C

Ultrasonic Clean 1 hour at 120F DI+Liquinox

Electropolish30 microns at 20C

Ultrasonic Clean1 hour at 120FDI+Liquinox

RF Tune

Dimensional Check and Correction

Helium Vessel Welding

Measure RF Properties

Lap Vacuum Seal Surfaces

Final Dimensional

CMM

Ultrasonic Clean1 hour 120FDI+Liquinox

First HPR2 hours, 2.4 gpm

at 1250 psig

First AssemblyClass 10

Final HPR2 hours, 2.4 gpm

at 1250 psig

Final AssemblyClass 10

Test Stand and Leak Check

Bake24 hours at 120C

RF Test2K Dewar

Qualified?

Store in Clean Room for String

Assembly

12 GeV C100 Cavity Process Flow

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Vertical test Area (VTA): Qualification tests

- HOM survey- RF power qualification:a) Cavity performances: Lock frequency, Emax, FE onset,

Radiation, test limits, cavity vacuum. b) Qo vs Eaccc) Rad vs Eaccd) HOM A and HOM B vs Eacce) Delta Freq vs Eacc2f) Qo vs T

Data mining and analysis for eventual corrective actions for the process flow.

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Vertical test Area (VTA): Landing area and control room

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Vertical test Area (VTA): Dewars area

Vertical test Area (VTA): HOM survey

- Specifications- Measurement methods : manual and enhanced Polfit

package based on Carsten’s and Hans Walter method to extract loaded Q from measured scattering parameters.

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

1800 2000 2200 2400 2600 2800 30001.0E+01

1.0E+02

1.0E+03

1.0E+04

1.0E+05

1.0E+06

1.0E+07

1.0E+08

1.0E+09

1.0E+10

1.0E+11

VTA HOM CharacterizationC100-RI-048 9/23/2011

maximum allowable Q (USE AS GUIDELINE ONLY) C100-RI-048 Loaded Q Values

Frequency (MHz)

Loa

ded

Q

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Vertical test Area (VTA): HOM survey cont.

Operator interface – low loss cavity LL002 at 44 MV/m

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Operator interface – LabView program

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Data acquisition, traveler, Excel macro

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Qo and Rad vs Eacc

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

HOM A and HOM B power vs Eacc

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Lorentz coefficient

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

1/Qo vs temp

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

C100-R

I-001

C100-R

I-003

C100-R

I-005

C100-R

I-008

C100-R

I-005

C100-R

I-003

C100-R

I-005

C100-R

I-007

C100-R

I-010

C100-R

I-003

C100-R

I-008

C100-R

I-013

C100-R

I-001

C100-R

I-008

C100-R

I-018

C100-R

I-017

C100-R

I-020

C100-R

I-022

C100-R

I-025

C100-R

I-029

C100-R

I-034

C100-R

I-027

C100-R

I-035

C100-R

I-027

C100-R

I-016

C100-R

I-024

C100-R

I-029

C100-R

I-036

C100-R

I-037

C100-R

I-040

0

5

10

15

20

25

30

35

40

45

Eac

c (M

V/m

)

HPR wand accidental iris damage Unsuccessful HPR

Cavity C100-RI-008 recovered after light EP!!!

With and without Helium vessel

Project specification: cavity gradient 19.2 MV/m average

Administrative limit set at 27 MV/m

From 9/23/2010 Up to 7/7/2011

Emax of VTA Qualified Cavities for 12 GeV Upgrade

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Emax of VTA Qualified Cavities for 12 GeV Upgrade

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

0 10 20 30 40 50 60 701000000000

10000000000

100000000000

Eacc (MV/m)

Qo

T = 2.07K

CEBAF upgrade cavity specification

Max. Eacc (MV/m) Test limitC100-RI-029 20.56* QuenchC100-RI-031 27.5 QuenchC100-RI-021 27.1 FEC100-RI-014 27 Admin limit at 27

MV/mC100-RI-022 28 FEC100-RI-030 27.8 QuenchC100-RI-025 30.1 Radiation >100mR/hC100-RI-028 27 Admin limited at 27 MV/m

* In previous tests, C100-RI-029 was quench limited at 26.7 MV/m

.1.1.1.1.1.1.1

.1

Qualified Cavities for 12 GeV Upgrade Cryomodule C100-3

Data mining

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Data mining

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Data mining

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

- Cables (some trivial – cables not connected, broken connectors supposed to operate at low temperature).

- Lambda vacuum leaks.- Occasional high radiation levels –> all cavities are

now radiation monitored after VTA tests.- Clean room over crowed (sometimes).- Glycol spill.- Vibration due to demolition , fumes and dust from

construction area, power outages.

Issues during VTA qualification tests

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

12 GeV Upgrade Cavities Production Tracking System

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

C100 string assembly

All remaining cavity strings should be clean room assembled by the middle for Feb 2012

Cryomodule assembly

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

- All 80 cavities will be VTA qualified by mid Dec 2011 – important effort to qualify at least 3 cavities each week!

- 3 Cryomodules installed and commissioned in CEBAF machine (R100 and 2 C100).

- C100-3 advanced qualification tests in CMTF- 7 cavity strings in different phases of assemble- All reaming cavity strings should be clean room

assembled by the middle of February 2012.

VTA operator team for 12 GeV project

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Kirk DavisChristiana GrenobleMircea StirbetTiffany BassPete KushnickGrigory EmereevAri PalczewskiGianluigi CiovatiRongi GengJohn MammosserAndrew BurrillTom GoodmanJ. C. Westby-Gibson

Cryogenie supportPete KushnickTiffany BassDanny Forehand

Pansophy supportValery BookwalterBonnie MadreMelody Jones

Crane operatorsChris DreyfusSteve CastagnolaTom GoodmanDanny ForehandRoland Overton

TUPO061 SRF 2011 Chicago, July 25-29, 2011

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Conclusions

Open Collaboration Meeting on Superconducting Linacs for High Power Proton Beams (SLHiPP-1) 8/9 December 2011 CERN – Geneva Switzerland

Almost all cavities for 12 GeV project are qualified.Thank you !!!