W. WuenschCLIC project meeting

8-7-2011

High-power rf structure testing

I’ll cover structure and testing requirements for a program with boundary conditions:• covers roughly five years• arrive to industrialize-able structures• still pursues higher performance

Our X-band menagerie:

• Main linac accelerating structures• Other X-band – crab, bunch compressor• PETS• rf network

***in low breakdown rate tests***

Finished products

NLCTA at SLACNextef at KEK

New klystron at CERNTwo-beam test stand at CERN

ASTA at SLAC

Prototype accelerating structure test areas

High Power Operation History

Final Run at 230 ns: 94 hrs at 100 MV/m w BDR = 7.6e-5 60 hrs at 85 MV/m w BDR = 2.4e-6

0 200 400 600 800 1000 12000

20

40

60

80

100

120

140

Accumulated rf process time (hr)

BDR (1/hr)<G> for regular cell (MV/m)Pulse width (divided by 10) (ns)

TD18C. AdolphsenF. WangSLAC

Processed for 1744 hours.

2011/3/11 7T24#3 Summary (7)

KEK

T24#3BDR evolution at 252nsnormalized 100MV/m

2011/3/11 8T24#3 Summary (7)

Assuming the same exponential slope as that at 400hr

We understand the BDR has been kept decreasing.

From T. Higo

Results summary

CTF3linac

PETs branch

High-gradient test stand, CTF2

High-power transfer line

Two-beam 30 GHz power production in CTF3 converted to beam-loading experiment.

Finish up baseline:TD24, compact couplers, SiC loads and manifolds, wakefield monitor

10

Optimize process:Material, machining, surface and heat treatment with low-power (recirculation), 10-20 MW, so 2 to 4 per testing slot.

40

Baseline evolution:Optimized high-power design, new energy optimum

10

Alternatives:DDS and hybrid derivatives, choke mode, quadrants

10

Basic studies:High-power phenomenon, exotic stuff

5

Medium-series:Statistical and long term

50

Other X-band:Crab cavity and bunch compressor

5

PETS:Consolidate results, statistics – 150 MW input power, so 2 slots per test

5

rf network:Prototype network tests

5

What’s next:

Testing time @ 50 Hz

Process optimization, basic studies

1-2 months

Prototypes 3-6 monthsLong-term 1-2 years

slot yearsFinish up baseline: 10 5TD24, compact couplers, SiC loads and manifolds, wakefield monitor

Optimize process: 40 4Material, machining, surface and heat treatment with low-power (recirculation), 10-20 MW, so 2 to 4 per testing slot.

Baseline evolution: 10 5Optimized high-power design, new energy optimum

Alternatives: 10 5DDS and hybrid derivatives, choke mode, quadrants

Basic studies: 5 0.5High-power phenomenon, exotic stuff Medium-series: 50 40Statistical (40) and long term (10)Other X-band: 5 2.5Crab cavity and bunch compressor PETS: 5 2.5Consolidate results, statistics – 150 MW input power, so 2 slots per test

rf network: 5 1.2Prototype network tests

Total 65.7

Integrated time

2011 2012 2013 2014 2015 2016High-power, high rep-rate test areas

klystron 1, 50 MW, SLAC operation at 1 slots/stand klystron 2, 50 MW CPI supply and comissioning operation at 2 slots/klystron klystron 3, 50 MW CPI klystron 4 klystron 5 klystron 6 klystron 7

KEK klystron lifetime estimateSLAC Saclay 2x5 MW Thales proposal Valencia 5 MW, 9.3 GHz L3 proposal Groningen 2x5 MW L3 proposal Uppsala intention UK R&D linac rumoursFrascatti rumours

number of rf ports 1 1 2 1 1 2 2 2 2 2 6 6 6 5 9 9 9 9 13 13 13 13 13 13Total slot years: 38

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 240

2

4

6

8

10

12

14

Testing capability scenario