renovation of the 200 mhz rf system
DESCRIPTION
renovation of the 200 MHz RF system. LLRF issues. Cavities redistribution. 2011 : 4 cavities 2 x 4 sections 2 x 5 sections + 3 spare sections. 2018 : 6 cavities 4 x 3 sections 2 x 4 sections + 1 spare section. Courtesy of Elena Shaposhnikova. - PowerPoint PPT PresentationTRANSCRIPT
renovation of the200 MHz RF system
LLRF issues
14th LIU-SPS Coordination Meeting 2
Cavities redistribution
26 October 2011
2011 : 4 cavities
2 x 4 sections
2 x 5 sections
+ 3 spare sections
2018 : 6 cavities
4 x 3 sections
2 x 4 sections
+ 1 spare section
Courtesy of Elena
Shaposhnikova
14th LIU-SPS Coordination Meeting 3
1.7 MW amplifier, i.e 1.4 MW cavity
26 October 2011
To have 1.4 MW available at the cavity input, 1.7 MW at the Final output are needed
A major improvement to present systems would be to have individual SSA drivers per PA
Taking advantage of the long experience we have with tetrodes and combiners, the solution will be 16 x PAs combined through 3 dB combiners
Four contracts : Drivers (SSA) Finals (SSA or Tetrodes) Combiners (3 dB above 100 kW) Transmission lines (coaxial, 345 mm
outer)
Drivers16 SSAFinal16 PAs
3 dBcombinersand power loads
120 m and 180 mCoaxial lines
To cavity input 120 m away
From Beam Control
1/16 splitter
1.7 MW-0.6 dB
total
1.5 MW
-0.2 dB
1.4 MW
14th LIU-SPS Coordination Meeting 4
16 Tetrodes vs 2048 SSA
26 October 2011
Tetrodes tube costs over 20 years will be added : 20 years * 3/4 * 335 * 24 * 16 * 2 =
3’859’200 total hours With 20’000 hours per tube = ~ 200 tubes
SSA : + 20% to 25% additional transistors (not
module) Individual circulators are mandatory
Wall plug efficiency will be part of the adjudication HVPS included (Tetrodes) Losses in all SSA combiners, circulators and
loads included
1.7 MW128 x 830
WSSA
Final Tetrodes(gain = 12 dB)
SSA(Gain = 20 dB)
Nominal ratings
16 x 106 kW = 1700 kW
2048 x 830 W = 1700 kW
Maximum ratingsFor 1400 kW at cavity input
Maximum2 faulty tubes14 x 138 kW = 1932 kW
Maximum48 faulty modules2000 x 891 W = 1782 kW
Maximum ratingsDriver
16 x 8.7 kW 16 x 1.1 kW
16 x106 kW Tetrodes
16 x
14th LIU-SPS Coordination Meeting 5
First upgrade: Present amplifiers
26 October 2011
Maximum Ratings Present FutureCW, 5 seconds 650 kW 700kWPulsed, 43 kHz 900 kW 1100 kW
Tubes per year 6 + 17(547’000 CHF)
7 + 19(629’000 CHF)
SolutionsIncreased Filament voltage
Very expensive
Siemens HVPS need a full re-cabling and an air cooling improvement
Philips amplifiers air cooling plant to be modifiedBW-3dB Compromise to be discussed with LLRF
14th LIU-SPS Coordination Meeting 6
More Power with Present amplifiers
26 October 2011
Increase filament voltages :
Very expensive (562’000 CHF -> 1’111’000 CHF per year) Effective efficiency not tested ! Additional down time
YL1530Ufil
Max peak power
Lifetime Tube per year
Nb of stops
YL1530Costs
Additional cost
Nominal 900 KW 25’000 hrs 17 17 187’000 0+5% 1.0 MW - 25 % 22.7 23 253’000 + 66’000+10% 1.1 MW - 44 % 30.4 30 330’000 + 143’000
RS2004Ufil
Max peak power
Lifetime Tube per year
Nb of stops
RS2004Costs
Additional cost
Nominal 800 KW 20’000 hrs 6.25 6 375’000 0+5% 900 kW - 25 % 8.3 8 498’000 + 123’000+10% 1 MW - 44 % 9.76 10 585’000 + 210’000+15 % 1.1 MW - 58 % 13.02 13 781’000 + 406’000
14th LIU-SPS Coordination Meeting 7
More Power with Present amplifiers
26 October 2011
HVPS Siemens improvements : Full re-cabling Air cooling modification
Philips amplifiers improvement : Air cooling modification
‘pre-modifications’ during next 2011-2012 Xmas stop to test new configuration during a MD in 2012 : TX3 Siemens HVPS TX5 Air cooling
Siemens HVPS need an air cooling improvement
Siemens HVPS need a full re-cabling with new cable spacers
14th LIU-SPS Coordination Meeting 8
2 2.5 3 3.5 4 4.5200
600
1000
‘Philips’ Pout vs BW(T air max = 90 C)
More Power with Present amplifiers
26 October 2011
Driver over coupled trick already used nowadays on all TXs
Maximum Power strongly proportional to BW
Driver over coupled trick already used nowadays on all TXs
BW -3dB [MHz]
Pout [kW]
14th LIU-SPS Coordination Meeting 9
Present amplifiers BW
26 October 2011
The effective BW of the 1-Turn feedback is limited by The TX gain BW: When the TX gain
drops by ~ 20 dB, the overall loop has no more gain
The TX phase non-linearity: When the phase shift exceeds +-50 degree the overall loop gain must have dropped by more than 20 dB to keep the system stable
Conclusion: Good correction only in the band limited by +-30 deg phase non-linearity, and with an effectiveness that drops as the TX gain BW BW-3dB BW-15dB Phase distortion
Siemens
Line 1 TX1 + TX2
4 sections
≥ 2.5 MHz
≥ 5 MHz +/- 3.0 MHz +/- 30 °Line 2 TX3 +
TX44 sections
PhilipsLine 3 TX5 +
TX65 sections ≥ 8 MHz +/- 5.0 MHz +/- 30 °
Line 4 TX7 + TX8
5 sections
14th LIU-SPS Coordination Meeting 10
BW specifications ?
26 October 2011
New plan : Present amplifiers
connected to 3 sections cavities with higher bandwidth than 4 and 5 sections as per nowadays
New amplifiers connected to 5 sections cavities
What is the acceptable BW limit ? : For ‘Siemens’ and ‘Philips’ For new amplifiers
2018 : 6 cavities
4 x 3 sections
2 x 4 sections
+ 1 spare section
14th LIU-SPS Coordination Meeting 11
Operation modes (on a match power load)
26 October 2011
Measurements to be made on a power load
Measurements with a 200.222 MHz carrier at 400 kW and a frequency sweep 20dB below carrier :
Non linear phase distortionat +/- a MHz: max. +/- b°
Passband at -1 dB: x.0 MHzPassband at -3 dB: y.0 MHzPassband at -15 dB: z.0 MHz
Measurements to be made in CW and 10 us/43 kHz on a power load
With Po = 850 kW cw
With Po = 1700 kW 10 us / 43 kHz
Pout vs Pin must be monotonic from zero to Po
Small signal differential gain g = dPout/dPin, in the range 0.1 Po to 0.9 Po :
Local slope variation max +/-15%
Can vary by 3 dB maximum.
Gain saturation curve
Non linear phase distortion (CW):
Δ φmax < 10º
Non linear phase distortion curve
Pout
0.9 Po
0Pin
0.1 Po
3 dB maximum
g
gmax
gmin
Pin
g = dPout/dPin
Phase shift
Pin
Δ Φ max < 10ºAt Pin for Po
14th LIU-SPS Coordination Meeting 12
Operation modes (on a match power load)
26 October 2011
Continuous operation 24/24 hours CW for 10 months continuously
Very Long Pulses operationFc = 200.222 MHz +/- 0.5 MHz :100% from 0 to 900 kW with rise and fall time < 0.5 µs5 seconds ON / 5 seconds OFF
AM modulation #1Fc = 200.222 MHz +/- 0.5 MHz :100% from 0 to 900 kW with rise and fall time < 0.5 µsRepetition time 10 µs (100kHz)
AM modulation #2Fc = 200.222 MHz +/- 0.5 MHz :0 to 1700 kW with 4 MHz triangle AM 25 % in powerRise and fall time < 0.5 µsFlat top pulse and off pulse length of 11 usRepetition time 23 µs (43kHz) (and 172 kHz)This cycle for 20 second then 1 second OFF.
time
Power
5 s
0.5 us 0.5 us
240 kW
0 kW
10 s
time
Power
10 us
0.5 us0.5 us
240 kW
0 kW
time
Power
11 us
0.5 us 0.5 us
240 kW
0 kW
11 us
23 us
20 s 1 s
4 MHz triangle
25 %
14th LIU-SPS Coordination Meeting 13
New RF building
26 October 2011
No more ‘Power’ in BB3 Faraday Cage
Specific ‘Power’ control room in new RF building, Cavity controllers, Conditioning systems, amplifiers monitoring
BB3-FC large enough for 6 systems ?
14th LIU-SPS Coordination Meeting 14
Beam Control resources 0.5 0.5 0.5 0.5 0.25 0.25 0.5
Beam Control1’400 100 100 600 600
Draft schedule
26 October 2011
Authorizations
InstallBuild new hardware
Year 4Year 3Year 2Year 1 Year 5
BuildingServices
RF :
Building:
20172014201320122011 2015 2016 2018Year 6 Year 7
CommissioningTunnel :
Build New hardwareInstallation phase 1
(pickups + dampers + EL + coax lines …)Installation phase 2
(cavities + pickups + CV + EL + vacuum)
Cavities re-arrangement within a LS ( > 6
months)
Studies (amplifiers, couplers, cavities, LLRF)
Tendering (s)
Studies
Studies
Services
14th LIU-SPS Coordination Meeting 15
LLRF/Beam Control open issues ?
26 October 2011
What is the acceptable lower BW limit ? : For ‘Siemens’ and ‘Philips’ For new amplifiers
Technical Specifications ?
BB3-FC large enough for 6 systems ?
Is a 3 sections cavity available in new RF building earlier useful ?
Is the draft schedule still correct ? Time table Resources Money
How many time for commissioning without/with beam ?
What if LS2 earlier ? (later ?)
What else ?