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Olivier Brunner, on behalf of RF/MK.
RF/MK: 2013 in a nutshell
Installation: equipment, waveguides, water cooling, local cabling Upgrade of LEP equipment Contract follow up: new klystrons, spare circulators Reliability is a key issue here: RFQ commissioning, phase adjustment
Linac 4 – HPRF system installation and commissioning
• WR 2300, L = 1500 mm, r1=70mm, r2 = 40mm • VSWR ≈ 1.2 [depth 0 -> 100 mm]• S11 ≤ -30 dB [depth 0 -> 90 mm]• Range: ≈ max 60˚
Developments
phase adjustment / phase tuners graphic user interfaces (GUI)
D. Glenat
System performed very well: Did not limit the evolution of peak or integrated luminosityBetter performance than in 2011
Some “weaknesses” have been identified
To do list• 8 klystrons replaced (new boilers + age profile)• HV bunkers equipped with new air cooling systems• New klystron heating system• Oil tests and reconditioning• HV cable repair campaign• Thyratron replacement• DCCT and tetrode replacement R&D in progress• Maintenance• …
LHC RF System Operation (ACS)
o Very simple circuito No cooling (±10W)o 90 litters oil volume
o Sophisticate circuito Water/oil Cooling o 350 litters oil volumeo Limited lifetime
0
0.5
1
1.5
2
2.5
0 20 40 60
Sp
ark
ch
arge
(m
C)
VOLTAGE (kV)
Thyratrons & Solid State thyristors
Thyratron n°1914
Thyratron n°2827
Switch n°4 A5 triggerMA2622A
Switch n°1 trigger MA2622A
Solid State device has better performances than the thyratron Validated during 2012 running period In series production
Solid state crowbars (“fast protection system”)
Zone with welding defect
Klystron filament glitches responsible for frequent RF trips during operation Procedure validated to re-weld the connectors without damaging the insulation material Campaign in LHC will soon be launched
Repair of the high voltage connectors
Zone with welding defect
Equipment used in LHC are no longer produced by industry Development of a FPGA based electronic located in HV modulator Evaluation tests in progress
Digital measurement system for the klystron modulators
Zone with welding defect
Photo-diodeamplifier
Waveguideport
Detectorview angle
Interlock
Waveguidesystem
Optional external logic
Presented at the BE-KT day, June 3rd 2013 Agreement between CERN and an external company (Microstep-MIS- Slovak Rep.) to
transfer the knowledge
A new generation of Arc Detectors for the HPRF systems
Sample Testing with the Quadrupole Resonator
Research Highlight: Slow cooling across Tc
mitigates flux trapping in bulk niobium and reduces its residual losses.
High resolution measurements of the surface resistance
• Testing of models for SRF loss mechanisms• Studies of new materials and niobium treatments
SRF research
Zone with welding defect CTF3 operation (11 S Band and 1 L Band power sources) Thirteen PETS tanks installed and commissioned Full beam transport to end-of-line spectrometer Power produced (70 MW/PETS): fully consistent with expectations Max power produced: 720 MW (12 PETS) Max deceleration: ≈ 36%
CTF3 & CTF3 Test Beam Line (TBL)
TBL line in CLEX
Beam deceleration, measured in spectrometer and compared with expectations
Zone with welding defect
Contract (almost) placed with industry for 1 GHz high efficiency klystron Gun Sub-harmonic buncher Beam dynamics
Drive beam front end developments
Zone with welding defect Xbox1 reliably working for most of the year Two structures successfully tested Test bed for:
LLRF systems Conditioning and breakdown detection algorithm Diagnostic tool development
Xbox1: 12 GHz high gradient breakdown tests
Test Stand produces reliable results comparable to KEK
Zone with welding defect
Xbox2: Second X-band test bench in bld 150 Modulator installed Klystron in validation tests at SLAC Commissioning: Spring ‘14
Preparation of Xbox2
Zone with welding defect
Based on high repetition, low power klystrons Contract for klystron&modulators placed in August (Toshiba) Integration work has started
Next generation of x-band facility: Xbox3
Zone with welding defect
Cavities shipped to: Pakistan, London, Edinburgh, Madrid, Rome, Berlin, Poland, Norway, Hungary,
Denmark, Cern,...
LEP Copper cavities – a new life!
CERN, Bld 182 London Science Museum