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8th ESLS RF Meeting – September 2004
RF System 1/23
Storage RingRF System
F. Perez
8th ESLS RF Meeting – September 2004
RF System 2/23
Contents
• Power Requirements• Transmitter Options• Low Level Electronics Approach
• Voltage Requirements• Cavity Comparison
8th ESLS RF Meeting – September 2004
RF System 3/23
Power Requirements
Beam current 400 mA
Bending losses 950keV/turn
ID losses 300 keV/turn
Other losses 50 keV/turn
Total losses 1300 keV/turn
Beam power 520 kW
Energy Acceptance3 %
8th ESLS RF Meeting – September 2004
RF System 4/23
Transmitter
• TWO power escenarios:– ~150 kW– ~300 kW
• THREE transmitter type escenarios– High Power Klystron– IOT combination– Solid State Amplifier
8th ESLS RF Meeting – September 2004
RF System 5/23
Transmitter
For the case of ~300 kW IOT combination, we want to produce a combiner cavity prototype:
E. Wooldridge, ASTeC
Can also be used as a SSA combiner…
8th ESLS RF Meeting – September 2004
RF System 6/23
Low Level Electronics• IQ (DE)MODULATION
• Digital or analogue
A. Rohlev et al., CERN
8th ESLS RF Meeting – September 2004
RF System 7/23
Voltage Requirements
For 3% RF Energy Acceptance
1,5
2
2,5
3
3,5
4
0 200 400 600
Frequency [MHz]
RF
Vo
ltag
e [
MV
] .
8th ESLS RF Meeting – September 2004
RF System 8/23
Cavity
• NC 100 MHz MAXlab
• NC 180 MHz BNIP
• SC 352 MHz SOLEIL
• NC 500 MHz ELETTRA, UE, …
• SC 500 MHz CORNELL
8th ESLS RF Meeting – September 2004
RF System 9/23
Cavity 100 MHzTotal Voltaje 2.0 MV
No Cells/IPC 10
Type of cavity nc
Voltage / cell 200 kV
Rshunt 1,6 M
Cavity power 12,5 kW
Beam power/cav 52kW
IPC power 65 kW
Amplifier Power80 kW
Total Power 800 kW
REJECTED : 10 ARE TOO MANY CAVITIES
8th ESLS RF Meeting – September 2004
RF System 10/23
Cavity 180 MHzTotal Voltaje 2.4 MV
No Cells/IPC 4
Type of cavity nc
Voltage / cell 600 kV
Rshunt 4.3 M
Cavity power 42 kW
Beam power/cav 130kW
IPC power 172 kW
Amplifier Power180 kW
Total Power 720 kW
8th ESLS RF Meeting – September 2004
RF System 11/23
Cavity 180 MHz
REJECTED : TOO MANY HOMs
HOMs
8th ESLS RF Meeting – September 2004
RF System 12/23
Cavity 352 MHzTotal Voltaje 3.0 MV
No Cells/IPC 2 4
Type of cavity sc
Voltage / cell 1500 750 kV
Rshunt 4500 M
Cavity power 0 0 kW
Beam power/cav 260130 kW
IPC power 260 130 kW
Amplifier Power300 150 kW
Total Power 600 600 kW
ON STANDBY : ONE modul is too less and TWO too much …
8th ESLS RF Meeting – September 2004
RF System 13/23
Cavity 500 MHz (1)Total Voltaje 3.6 MV
No Cells/IPC 6
Type of cavity nc
Voltage / cell 600 kV
Rshunt 3.4 M
Cavity power 53 kW
Beam power/cav 87kW
IPC power 140 kW
Amplifier Power160 kW
Total Power 960 kW
1st OPTION
8th ESLS RF Meeting – September 2004
RF System 14/23
Cavity 500 MHz (2)Total Voltaje 3.6 MV
No Cells/IPC 6
Type of cavity nc
Voltage / cell 600 kV
Rshunt 3.0 M
Cavity power 60 kW
Beam power/cav 87kW
IPC power 147 kW
Amplifier Power160 kW
Total Power 960 kW
2nd OPTION
8th ESLS RF Meeting – September 2004
RF System 15/23
Cavity 500 MHz (3)Total Voltaje 3.6 MV
No Cells/IPC 2
Type of cavity sc
Voltage / cell 1800 kV
Rshunt 4500 M
Cavity power 0 kW
Beam power/cav 260kW
IPC power 260 kW
Amplifier Power300 kW
Total Power 600 kW
3rd OPTION
8th ESLS RF Meeting – September 2004
RF System 16/23
Cavity Comparison
(1) ELETTRA (2) EU (3) CORNELL
DC POWER 2.5 MW 2.6 MW 2.1 MW
WATER COOLING
220 m3/h 230 m3/h 140 m3/h
Cavity Wall Dissipation
Cavity Wall Dissipation
Refrigerator
8th ESLS RF Meeting – September 2004
RF System 17/23
Cavity Comparison
(1) ELETTRA (2) EU (3) CORNELL
SPACE 2 x 2.9 m 2 x 2.9 m 2 x 3.3 m
3 cavities in one 4 m straight
3 cavities in one 4 m straight
1 cavity in one 4 m straight
COST ESTIMATION
9.3 M€ 9.9 M€ 10.6 M€
6 x 1.55 M€ 6 x 1.65 M€ 2 x 5.1 M€
8th ESLS RF Meeting – September 2004
RF System 18/23
Cavity Comparison
RUNNING COST DIFFERENCES
(1) ELETTRA (2) EU (3) CORNELL
INVESTMENT - 600 k€ 1300 k€
DC POWER 400 kW 500 kW -
RUNNING (10y) (6000 h/year)
2400 k€ 3000 k€ -
MAN POWER (10y)(1.5 man/year)
- - 900 k€
OVER 10 YEARS +300 k€ +900 k€ -
SPACE, SERVICES and COST are NOT DECISION FACTORS
8th ESLS RF Meeting – September 2004
RF System 19/23
Comparison: Longitudinal HOMs
0,01
0,10
1,00
10,00
100,00
1000,00
500 1000 1500 2000 2500 3000
Freq [MHz]
Lo
ng
Imp
ed
an
ce [k
Oh
m]
ZII Threshold
ELETTRA/6
EU
SC/3
Stability threshold for 400 mA
8th ESLS RF Meeting – September 2004
RF System 20/23
Comparison: Transverse HOMs
Stability threshold for 400 mA
0,1
1,0
10,0
100,0
1000,0
500 700 900 1100 1300 1500 1700 1900
Freq [MHz]
Tra
nsve
rse
Impe
danc
e [k
Ohm
/m]
Zy Threshold Zx Threshold
ELETTRA/6 EU
CORNELL
8th ESLS RF Meeting – September 2004
RF System 21/23
HOMs comparison(1) NC ELETTRA
Needs: SC 3rd Harmonic Cavity
Transverse Feedback
(2) NC UENeeds: SC 3rd Harmonic Cavity
(3) SC CORNELLNeeds: None
8th ESLS RF Meeting – September 2004
RF System 22/23
Other Considerations3rd Harmonic Cavity is interesting for the 3 cases to
increase the Touschek lifetime
Transverse Feedback will be needed for broadband impedance instabilities in any case, but for the SC option will be simpler
SC option allows larger voltages (larger energy acceptance)
Reliability of the SC systems has to be considered
8th ESLS RF Meeting – September 2004
RF System 23/23
CONCLUSION