ilsf - 2-amplifiers - francis perezxilsf.ipm.ac.ir/news/2014-03-08rfandbeamdiagnostic... ·...
TRANSCRIPT
![Page 1: ILSF - 2-Amplifiers - Francis Perezxilsf.ipm.ac.ir/News/2014-03-08RFandBeamDiagnostic... · GaAsFET. SITs Solid State Amplifiers. SSA module SOLEIL Solid State Amplifiers ... 220](https://reader034.vdocuments.mx/reader034/viewer/2022051601/5acb0b2b7f8b9a7d548e5906/html5/thumbnails/1.jpg)
RF systems
Francis Perez
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Part II:
High
Power
Amplifiers
RF signal generatorRF signal generator
LowLow --level RF controllevel RF control
RF power distributionRF power distribution
Accelerating structureAccelerating structure
RF power AmplifierRF power Amplifier
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Definition:
An RF power amplifier is used to convert a low-power RF
signal into a high power.
� There are several types of amplifiers with
different characteristics.
� Frequency
� Power
�Maintenance cost.
�Efficiency.
�Size and weight.
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• Tetrodes – Grided tubes
• Klystrons
• Inductive Output Tubes
• Solid state amplifiers
vacuum tubes
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Grided Tubes - Tetrode
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Grided Tubes - Tetrode
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� Grid tubes:
Grided Tubes - Tetrode
Used at MaxLab
100 MHz
30 kW
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FrequenFrequencycy
(MHz)(MHz)
Max. Max. power power (kW)(kW)
EfficienEfficiencycy(%)(%)
Main FeaturesMain Features Main drawbacksMain drawbacks
Up to 200
200/tube
η ≤ 70 � Simplicity.� Low cost.
High voltage.Transit-time limited.
Grided Tubes - Tetrode
One will use for low frequencies
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Klystron
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Klystron
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HVPS
-50 kV
8 A
Filament
PS
Solid State
RF Amplifier
25 W
250 kW
RF
150 kW
Cavities
Heat dissipation
Collector
Klystron
Cavities
Gun400 kW
DC
Klystron principle:
- High electron DC current produced in the klystron gun.
- Current velocity modulated in the first cavity by the driving power.
- The e-beam is then grouped in pulses, which are enhanced in three intermediate cavities (shorter pulses)
- This pulsed stream induces a high field in the last cavity, out of which the high power is decoupled.
Klystron
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ANKA Klystron:ANKA Klystron:Frequency: 500 MHzOutput Power: 250 kWGain > 40 dB
Klystron
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3 GHz – multicell structure
Klystron modulators
ALBA Linac:ALBA Linac:Frequency: 3.0 GHzOutput Power: 30 MWGain > 40 dB
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FrequencFrequenc
yy
(GHz)(GHz)
Max. power Max. power
(MW)(MW)
EfficiencyEfficiency
(%)(%) Main Main
FeaturesFeatures
Main drawbacksMain drawbacks
0.3 - 30~ 2 (HP tubes)
~100 (Pulsed
tubes)
40 ≤ η ≤
60
� High
power.
� High gain.
� Controlled
output.
High voltage.
Efficiency.
Klystron
One will use for high power
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� IOTs combine design aspects of Triodes and Klystrons .
� Cathode.� Grid. � Density modulated..
� Linear beam� Magnetic focussing field.� Output cavity� Collector
� From Triodes :
� From Klystrons :
IOT (Inductive Output Tube)
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Collector
-+
H.V supply
36 kV / 3.5 A
RF IN
400 W @ 500 MHz
RF OUT
80 kW @ 500 MHz
500 MHz pulses
e- gun
IOT
Defocusing
coil
Output
cavity
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IOT in the troley
IOT
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FrequencFrequenc
yy
(MHz)(MHz)
Max. Max.
power power
(kW)(kW)
EfficiencEfficienc
yy
(%)(%)
Main FeaturesMain Features Main drawbacksMain drawbacks
100 -
2000
100
/tube
η ≤ 80
� Efficiency.
� Reliable and
cheap.
High voltage.
Power limited at
high frequencies,
IOT
One will use for high eficiency
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RF transmitter/modulator
In terms of power, its
function if to transform a
DC power (high voltage)
into an
RF power (voltage)
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High Voltage Power Supply: HVPS
ALBA
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High Voltage Power Supply: HVPS
HVPS IOT
ALBA
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High Voltage Power Supply: HVPS
Heatsink
Input fuses 3 phase input
DC link capacitor bank
Currenttransfromer
Module filter
Fiber opticlink
3 phas erectifier
Clip for module fastening
Supplytransformer
IGBT
Free wheelingdiode
DC output
DC output
Control fuse
Heatsink
Input fuses 3 phase input
DC link capacitor bank
Currenttransfromer
Module filter
Fiber opticlink
3 phas erectifier
Clip for module fastening
Supplytransformer
IGBT
Free wheelingdiode
DC output
DC output
Control fuse
Built up with
60 modules in series
of 700 V each
x 60
ALBA
98% efficiency
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Klystron modulators
ALBA Linac:ALBA Linac:Frequency: 3.0 GHzOutput Power: 30 MWGain > 40 dB
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500 MHz - 5 cell Petra type IOT transmitter
ALBA Booster IOT:ALBA Booster IOT:Frequency: 500 MHzOutput power: 80 kW
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500 MHz – Dampy cavity
IOT transmitters
SR RF
ALBA SR IOTs:ALBA SR IOTs:Frequency: 500 MHzOutput power: 160 kW 2 × 80 kW IOT.
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Solid State Amplifiers
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Solid State Amplifiers
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� The power required is obtained by operating numerous
transistors in parallel.
� Technologies available:
� Si bipolar transistors.
� Si LDMOS.
� GaAsFET.
� SITs
Solid State Amplifiers
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SSA module SOLEIL
Solid State Amplifiers
Matching circuit
Matching circuit
Input balunInput balun
Output balunOutput balun
circulator
Bias circuits
Bias circuits
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Amplifier Module
Water Cooling
Dissipater
DC/DC Converter
2.5 kW Combiner
Coaxial Output
2.5 kW Groups
8-Way Splitter
2-Way Splitter
40 kW Combiner
35 kW
Directional Coupler
20 kW Combiner
40 kW Combiner
SOLEIL
Solid State Amplifiers
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SOLEIL
Solid State Amplifiers
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SOLEIL SSA:SOLEIL SSA:Frequency: 352 MHzOutput power: 180 kW 726 ×315 modules in 4 towers.2 × Si LDMOS transistors per module.
Solid State Amplifiers
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SSA need voltage to voltage converters
220 V ac to 50 V dc needed by the transistor
SOLEIL
Voltage to voltage converters
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FrequencFrequenc
yy
(GHz)(GHz)
Max. Max.
power power
(kW)(kW)
EfficiencEfficienc
yy
(%)(%)
Main FeaturesMain Features Main drawbacksMain drawbacks
0 - 10 0.5/Module
η ≤ 40
� Modularity.
� Low
maintenance.
� Graceful
degradation
Efficiency.
Combiner
losses.
Transistor
isolation.
Solid State Amplifiers
One will use at medium frequencies,
for high reliability
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Thank you
Questions?