w. wuensch clic project meeting 8-7-2011 high-power rf structure testing
DESCRIPTION
Our X-band menagerie: Main linac accelerating structures Other X-band – crab, bunch compressor PETS rf network ***in low breakdown rate tests***TRANSCRIPT
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