CERN SPS Upgrade, new 800MHz & 200 MHz Amplifiers

Report
CERN SPS Upgrade
New 200 MHz and 800 MHz amplifiers
CERN Accelerator Complex

Protons and Lead Ions to maximum
acceleration






Eric Montesinos
CERN-RF
LINAC2 (proton) or Linac 3 (Lead ions)
Booster (protons) or Leir (lead ions)
PS (Proton Synchrotron)
SPS (Super Proton Synchrotron)
LHC (Large Hadron Collider)
Several other experiences :




n_TOF – The neutron time-of-flight facility; a
neutron source that has been operating at
CERN since 2001
AD – The Antiproton Decelerator;
manufacturing antimatter providing lowenergy antiprotons for studies of antimatter
ISOLDE – Isotope Separator On-Line; source
of low-energy beams of radioactive isotopes
CLIC – the Compact Linear Collider Study;
an international collaboration working on a
concept for a post LHC machine to collide
electrons and positrons head on at energies
up to several TeV
Thursday, 6th October 2011
15th ESLS-RF Workshop
2
CERN SPS
– the Super Proton Synchrotron

The second largest machine in CERN’s
accelerator complex, nearly 7 km in
circumference. It was switched on in 1976
(CERN Nobel-prize for discovery of W
and Z particles in 1983)

Presently, SPS accelerates particles to
provide beams for the:




Eric Montesinos
CERN-RF
North Experimental area
FT (Fixed Target) program (North Area)
CNGS project
LHC (Large Hadron Collider)
And Many Machine Developments
SPS as LHC injector
CNGS : CERN Neutrions to Gran Sasso
Thursday, 6th October 2011
15th ESLS-RF Workshop
3
200 MHz RF in the SPS
1975


Eric Montesinos
CERN-RF
1980 1990 2000 2010
1976
TWC#1 / TX1
TWC#2 / TX2
The RF-SPS started up in 1976 with two
accelerating cavities
1979
TWC#4 / TX4
1978
TWC#3 / TX3
Since 1980, for the new role of SPS as
proton-antiproton collider, there are four
cavities operating @ 200 MHz
1980
TWC#1 / TX1+TX2
TWC#2 / TX3+TX4
TWC#3 / TX5+TX6
TWC#4 / TX7+TX8
Configuration of one of the four
200 MHz power plant
Transmitter (TXA)

We have 4 lines :

2 x Siemens: 20 x RS2004

2 x Philips: 68 x YL1530
mW
Coaxial transmission line
(feeder line)
125 to 160 meters
Dummy load
Terminating loads
Power
combiner
Transmitter (TXB)
Accelerating cavity
Thursday, 6th October 2011
15th ESLS-RF Workshop
4
Two ‘Siemens’ lines = 20 x RS2004
From Beam Control
Ø
Eric Montesinos
CERN-RF
From Beam Control
G
Ø
G
1W
Solid state
1W
Solid state
1W
Solid state
1W
Solid state
100W
Solid state
100W
Solid state
100W
Solid state
100W
Solid state
1kW
YL1440 tube
1kW
YL1440 tube
1kW
YL1440 tube
1kW
YL1440 tube
10kW
YL1520 tube
10kW
YL1520 tube
10kW
YL1520 tube
10kW
YL1520 tube
100kW
RS2004 tube
100kW
RS2004 tube
100kW
RS2004 tube
TXA
TXB
4 x 125kW
4 x 125kW
RS2004 tubes RS2004 tubes
One line (input cavity ~125/140 m away)
Thursday, 6th October 2011
TXA
TXB
4 x 125kW
4 x 125kW
RS2004 tubes RS2004 tubes
100kW
RS2004 tube
One line (input cavity ~125/140 m away)
15th ESLS-RF Workshop
5
Two ‘Philips’ lines = 68 x YL1530
From Beam Control
Ø
From Beam Control
G
1W
Solid state
Ø
1W
Solid state
100W
Solid state
100W
Solid state
1kW
YL1440 tube
35kW
YL1530 tube
TXA
16 x 35kW
YL1530
tubes
TXB
16 x 35kW
YL1530
tubes
G
1W
Solid state
1W
Solid state
100W
Solid state
100W
Solid state
1kW
YL1440 tube
1kW
YL1440 tube
35kW
YL1530 tube
35kW
YL1530 tube
One line (input cavity ~160/180 m away)
Thursday, 6th October 2011
Eric Montesinos
CERN-RF
1kW
YL1440 tube
TXA
16 x 35kW
YL1530
tubes
TXB
16 x 35kW
YL1530
tubes
35kW
YL1530 tube
One line (input cavity ~160/180 m away)
15th ESLS-RF Workshop
6
Travelling Wave Cavities
Eric Montesinos
CERN-RF
One section:
11 drift tubes

One section = 11 drift tubes

2 x 4 sections Siemens plants

2 x 5 sections Philips plants


One 4 sections cavity
4 Main Power Couplers

2 input couplers

2 output couplers
2 x 550 kW terminating power loads
Thursday, 6th October 2011
15th ESLS-RF Workshop
7
200 MHz limitations

With present 4 cavities configuration we
will have problems at ultimate LHC current

The increased number of shorter cavities
with 2 extra power plants should
significantly improve the RF performance
for ultimate LHC intensities
Eric Montesinos
CERN-RF
Courtesy of Elena
Shaposhnikova


The best compromise is 6 cavities:
Total voltage possible on the flat top vs
beam current with :

4 x 3 sections cavities with 1.0 MW


2 x 4 sections cavities with 1.4 MW



Thursday, 6th October 2011
4 cavities (present situation) with 1.0 MW
5 cavities with 1.0 MW RF
6 cavities with 4 x 1.0 MW + 2 x 1.4 MW
Dashed lines are at nominal and ultimate
beam currents.
15th ESLS-RF Workshop
8
Cavities redistribution

2011 : 4 cavities
2 x 4 sections

Eric Montesinos
CERN-RF
2018 : 6 cavities
2 x 4 sections
4 x 3 sections
2 x 5 sections
+ 3 spare sections
+ 1 spare section
Thursday, 6th October 2011
15th ESLS-RF Workshop
9
First upgrade: Present amplifiers
Ratings
Present
Future
CW
5 seconds
650 kW
700kW
Pulsed
43 kHz
900 kW
1100 kW
BW-3dB
2.6 MHz
2.3 MHz
Tubes per
year
6 + 16
7 + 18
HVPS need a full re-cabling and an air cooling
improvement to allow higher pulsed mode
Thursday, 6th October 2011
15th ESLS-RF Workshop
Eric Montesinos
CERN-RF
Tetrodes:
Present lifetime statistics,
operating ~650 kW cw:
RS2004 : 20’000 hrs
: 6 tubes per year
YL1530 : 25’000 hrs
: 16 tubes per year
HVPS need a full recabling and air cooling
improvement to allow
higher pulsed mode
10
New RF power plant
Eric Montesinos
CERN-RF
New RF Building

New RF Amplifier
1 mW

LSS3 Tunnel integration
1.7 MW
RF amplifier
1 mW
Coaxial transmission line
150 meters
1.7 MW
RF amplifier

New RF Building
Accelerating cavity
Thursday, 6th October 2011
15th ESLS-RF Workshop
Accelerating cavity
11
2018 : two new power amplifiers

Must be reliable:

24/24 hours

300/365 days
(2 months winter Technical stop)


2 x 1.7 MW Klystron

2 x 4 x 450 kW Diacrodes

2 x 8 x 225 kW IOTs

2 x 8 x 225 kW tetrodes
20 years of operation,
with 3 years of operation + 1 year off cycle


Equivalent to ‘Siemens’
Pulse mode: 1.7 MW max


Eric Montesinos
CERN-RF

Average: 850 kW (thermal limitation)

Thursday, 6th October 2011
2 x 16 x 110 kW tetrodes
Equivalent to ‘Philips’
2 x 1700 x 1 kW SSA
15th ESLS-RF Workshop
12
1.7 MW amplifier, i.e 1.4 MW cavity




To have 1.4 MW available at the cavity
input, 1.7 MW at the Final output are
needed
Taking advantage of the long experience
we have with tetrodes and combiners, a
possible solution could be a 16 x tetrodes
combined through 3 dB combiners
A major improvement to present systems
would be to have individual SSA drivers
per tetrodes




From Beam Control
Drivers
16 SSA
Final
16 Tubes
or SSA
1.7 MW
-0.6 dB
total
3 dB
combiners
and power loads
Drivers (SSA)
Finals (SSA or Tetrodes)
Combiners (3 dB above 100 kW)
Transmission lines (coaxial, 345 mm outer)
Thursday, 6th October 2011
1/16 splitter
1.5 MW
120 m and 180 m
Coaxial lines
Four contracts :
Eric Montesinos
CERN-RF
15th ESLS-RF Workshop
-0.2 dB
To cavity input 120 m away
1.4 MW
13
SSA vs Tetrodes

Overdesign requirements :

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14/16 tubes shall provide full power, i.e. each
tube shall deliver up to 138 kW
SSA are more ‘reliable’: 2000/2048 of the
total number of devices shall deliver full
power
Tetrodes tube costs over 20 years will be
added :

20 year * 3/4 * 335 * 24 = 120’000 total
hours

With 20’000 hours per tube = ~ 200 tubes

Reduced by warranty lifetime
Eric Montesinos
CERN-RF
Final
Nominal
ratings
SSA obsolescence shall be integrated:

i.e. 20% additional transistors, not module,
single chips (still under discussion, need
experts inputs)
Thursday, 6th October 2011
15th ESLS-RF Workshop
16 x 106 kW =
1700 kW
SSA
(Gain = 20 dB)
2048 x 830 W =
1700 kW
Maximum Maximum
ratings
2 faulty tubes
For 1400 kW
14 x 138 kW =
at cavity input
1932 kW
Maximum
48 faulty modules
2000 x 891 W =
1782 kW
Maximum
ratings
16 x 8.7 kW
Driver
16 x 1.1 kW


Tetrodes
(gain = 12 dB)
Wall plug efficiency will be part of the
adjudication

HVPS included (Tetrodes)

Losses in all SSA combiners, circulators and
loads included
14
New RF building
Eric Montesinos
CERN-RF

Only possible location is between two
existing buildings

Maximum ‘RF’ foot floor will be
2 x 450 m2

Whatever the solution, SSA or Tetrodes,
the same building, no impact on the choice
800 MHz
RF workshop
Siemens
Faraday Cage
Philips
Thursday, 6th October 2011
15th ESLS-RF Workshop
15
Draft schedule
Eric Montesinos
CERN-RF
Year 1
Year 2
Year 3
Year 4
Year 5
Year 6
Year 7
2011
2012
2013
2018
2014
2015
2016
2017
Studies (amplifiers, couplers, cavities)
RF :
Cavities re-arrangement within
a LS ( > 6 months)
Tendering
MS
Build new hardware
Tunnel :
Install
Studies
Commissioning
Build New hardware
Building:
Installation phase 1
(pickups + dampers + CV + EL + …)
Studies
Installation phase 2
(cavities)
Authorizations
Building
Services
Thursday, 6th October 2011
15th ESLS-RF Workshop
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200 MHZ upgrade Conclusions

We will have two new 1.7 MW pulsed / 850 kW average RF power amplifiers

Building will be the same, no impact

The less expensive solution beetween SSA and Tetrode will be selected !
Thursday, 6th October 2011
15th ESLS-RF Workshop
Eric Montesinos
CERN-RF
17
800 MHz RF in the SPS
Eric Montesinos
CERN-RF

The proton beams for the LHC are intense and unless careful precautions are taken they
become unstable in the SPS and cannot be accepted by the LHC

One of the most important systems in the SPS used to keep the beams stable and of the
highest quality is the 800 MHz RF system acting at the second harmonic of the main
accelerating 200 MHz RF system

This 800 MHz system in the SPS is essential for maintaining stability of the LHC beams. It is
required at every point in the cycle from injection to extraction. It works by increasing the
synchrotron frequency spread in the beam

Stability is problematic above 1/5 nominal without the 800 MHz

By applying RF voltages of ~ 1 MV (about 1/7 of the main RF system) via two cavities in the
SPS ring this “Landau Damping” system increases the natural spread of synchrotron
frequencies in the individual proton bunches, prevents them acting together, and thus ensures
stability

The RF power source and its ancillary equipment for this 800 MHz system must be of the
highest reliability to ensure beams are available for the LHC at all times
Thursday, 6th October 2011
15th ESLS-RF Workshop
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Old 800 MHz system (1)

Since 1980, the system is composed of :

2 Travelling Wave Cavities

2 transmitters of 225 kW each connected
via ~ 120m waveguides to the TWC

4 x 56 kW klystrons Valvo YK1198 per
transmitter combined using 3 dB hybrids
Thursday, 6th October 2011
15th ESLS-RF Workshop
Eric Montesinos
CERN-RF
19
Old 800 MHz system (2)

Unfortunately, that system has not been
used for a very long time and has not been
properly maintained.

We still only have :


2 simultaneous klystrons available on 1 cavity

6 operational klystrons

10 broken klystrons (could be repaired for
100’000 $ each)
Eric Montesinos
CERN-RF
We also had major difficulties with power
converter transformers :

9/9 burnt

4 repaired
Thursday, 6th October 2011
15th ESLS-RF Workshop
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Upgrade proposal
Eric Montesinos
CERN-RF
Replace Klystron Transmitters with IOT
Transmitters and re-use all existing
peripherals


Maximum power will be slightly increased
up to 240 kW CW


1.0 MHz with Klystrons

6.0 MHz with IOTs

Power
converters
RF Power Amplifier 60 kW cw
Amplifiers
Attenuator
Splitter
Ø shifter
Monitoring
and
Controls
Power
converters
RF Power Amplifier 60 kW cw
Attenuator
Monitoring
and
Controls
Power
converters
RF Power Amplifier 60 kW cw
Amplifiers
Ø shifter
Attenuator
Thursday, 6th October 2011
Monitoring
and
Controls
Power
converters
3dB Combiner
Amplifiers
Ø shifter

Final amplifier IOT based

Individual power converters
Individual Monitoring and control
compatible with CERN interface
In total it will be 8 + 1 transmitters
One 800 MHz Line
Layout
Power load
3dB Combiner
Monitoring
and
Controls
3dB Combiner
Amplifiers
Attenuator
RF power amplifiers chain
One 240 kW Transmitter
Layout
RF Power Amplifier 60 kW cw
Ø shifter


BW-1dB will be increased:

New transmitters will include:
Power load
Power load
15th ESLS-RF Workshop
Cavity and Transmitter
Monitoring and Controls
(CERN)
waveguide line
(125 meters )
Cavity
Terminating load
21
Selected supplier : Electrosys

Two companies per member state have
been contacted (40 companies)

Six companies have been compliant to our
specifications

Electrosys has been selected

‘Quasi’ off the shelves Transmitter

Possibility to have Thales or e2v trolleys
and tubes for the same price
Thursday, 6th October 2011
15th ESLS-RF Workshop
Eric Montesinos
CERN-RF
22
Factory Acceptance Tests:
various operational modes
Continuous operation
Eric Montesinos
CERN-RF
24/24 hours CW for 10 months
continuously
 24 hours made prior to our visit.
 4 hours made with us
Power
Very Long Pulses operation
Fc = 800.888 MHz +/- 0.5 MHz :
100% from 0 to 240kW with rise and fall time < 0.5 µs
5 seconds ON / 5 seconds OFF
240 kW
One hour made with us
0 kW
0.5 us
time
0.5 us
5s
10 s
Power
AM modulation #1
Fc = 800.888 MHz +/- 0.5 MHz :
100% from 0 to 240kW with rise and fall time < 0.5 µs
Repetition time 10 µs (100kHz)
AM modulation #2
Fc = 800.888 MHz +/- 0.5 MHz :
0 to 240kW with 4 MHz triangle AM 25 % in power
Rise and fall time < 0.5 µs
Flat top pulse and off pulse length of 11 us
Repetition time 23 µs (43kHz)
This cycle for 20 second then 1 second OFF.
Thursday, 6th October 2011
240 kW
 One hour made with us
0 kW
time
0.5 us
0.5 us
10 us
Power
4 MHz
triangle
240 kW
25 %
0 kW
0.5 us
time
0.5 us
11 us
 One hour made with us
11 us
23 us
20 s
15th ESLS-RF Workshop
1s
23
Factory Acceptance Tests:
Bandwidth
Eric Montesinos
CERN-RF
Pout vs frequency
70
Power Amplifier (Driver + Final)
Pmax = 61.0 kW
60

Operating frequency :
50
800.888 MHz
6.0 MHz (+/- 3.0 MHz)

CW output minimum power :
60 kW

Amplifier meets all requirements
40
BW-1dB = 7.0 MHz (-3/+4 MHz)
30
20
10
0
790
796.25
796.75
797.25
797.75
798.25
798.75
799.25
799.75
800.25
800.75
801
801.5
802
802.5
803
803.5
804
804.5
805
805.5
806
Bandwidth at -1dB :
Pout [kW]

Pmax -1dB = 47.5 kW
Frequency [MHz]
Thursday, 6th October 2011
15th ESLS-RF Workshop
24
Factory acceptance tests:
Phase stability
Eric Montesinos
CERN-RF
Measurements to be made with each Power Amplifier
AND
with the whole Transmitter (i.e. four Power Amplifiers combined together)
Measurements with a
800.888 MHz carrier at Pmax/2 and a
frequency sweep 20dB below carrier :
Non linear phase distortion
at +/-3.0 MHz: max. +/- 10°

Carrier f0 at mid power (30 kW)
with additional - 20 dB power sweep

Fully fulfill specification
Passband at -1 dB: 5.0 MHz
Passband at -15 dB: 8.0 MHz
Thursday, 6th October 2011
15th ESLS-RF Workshop
25
Factory acceptance tests:
Power Sweep
Eric Montesinos
CERN-RF
Gain
AND
with the whole Transmitter (i.e. four Power Amplifiers combined
together)
25.00
24.00
23.00
22.00
21.00
20.00
19.00
Gain saturation curve
With one PA : Po = 60
kW
-70
-72
-74
-76
-78
-80
-25.0
-24.2
-23.4
-22.6
-21.8
-21.0
-20.2
-19.4
-18.6
-17.8
-17.0
-16.2
-15.4
-14.6
-13.8
-13.0
-12.2
With four PA : Po = 240
kW
Phase
Phase [deg]
IoT Gain [dB]
Measurements to be made with each Power Amplifier
Drive in [dBm]
Pout
 Small signal differential
gain in the range 0.1 Po to
0.9 Po:
g
gmax
3 dB maximum
Local slope variation max
+/-15%
Can vary
maximum.
by
3
gmin
Pin
dB
 Local slope variation +/5% (+/- 2% averaged)
Vary by 2.0 dB maximum
Non linear phase distortion curve
Pin
Non
linear
distortion (CW):
Δ φmax < 10º
phase
Δ Φ max < 10º
At Pin for Po
Phase shift
 Phase distortion < 3°
differential TX gain
y = -0.0026x2 + 0.2323x + 25.765
-25.0
-24.2
-23.4
-22.6
-21.8
-21.0
-20.2
-19.4
-18.6
-17.8
-17.0
-16.2
-15.4
-14.6
-13.8
-13.0
-12.2
Pin
Small signal differential
gain g = dPout/dPin, in
the range 0.1 Po to 0.9 Po
33
31
29
27
25
10
5
Local slope
0
-5
-25.0
-24.2
-23.4
-22.6
-21.8
-21.0
-20.2
-19.4
-18.6
-17.8
-17.0
-16.2
-15.4
-14.6
-13.8
-13.0
-12.2
g = dPout/dPin
0.1 Po
0
Local slope
variation [%]
Pout vs Pin must be
monotonic from zero to
Po
Differential gain
[dB]
0.9 Po
-10
0.1 Pmax
Thursday, 6th October 2011
15th ESLS-RF Workshop
0.9 Pmax
26
Factory Acceptance Tests:
conclusion

Eric Montesinos
CERN-RF
All factory acceptance tests have shown compliance respect to the specification, and even
better :

Linearity

Monotonous

Phase stability

Maximum output power

All requirements were fulfilled (we repeated all the tests twice to confirm the results)

We checked modularity of the equipments

We controlled noise level

We checked protections:

driver output reflected power operated while making tests (due to over range power sweep)

Water cooling, air temperature, current limits, etc …
Thursday, 6th October 2011
15th ESLS-RF Workshop
27
CERN Acceptance Tests

Pre-series Amplifier has been integrated within CERN operational area

All tests cycles have been done for 4 hours each, no trouble has been discovered
Thursday, 6th October 2011
15th ESLS-RF Workshop
Eric Montesinos
CERN-RF
28
Long duration tests:
CW mode
Eric Montesinos
CERN-RF

When we launch CW long duration tests, difficulties arose

While doing the test over six weeks, we were not able to obtain a stable operation

Maximum time slots were :
 115 hours
:1
 66 hours
:2
 33 hours
:5
 < 24 hours
: 18
CW Alarm repartition
Inverter Fault
18%
→ Not stable enough in CW mode
120
60
40
20
13
4
1
2 0.50.5
0.15
5
0.50.50.52.5
33 33 33
Cleaning filter- 6 May
60
4
7
10
HV iInhibit &
HVPS Over
Voltage
64%
HV Inhibit
18%
66
47
34
32
11
32
31
20
16
0.5
Adjustement tube by phone with Mr. Bel - 15 april
Newcharge 250 kW - 4 april
80
Calibrate directionel coupleur - 7 april
100
115
Adjustement tube with M. Bel - 12 May
140
14 16
8
5
0.5
26
23 24
19
16
5
0.5
25
20
13
15
12
15
12 12 12
14
10 9
0.02
0.02
8
4
8
0
Thursday, 6th October 2011
15th ESLS-RF Workshop
29
Air temperature sensitivity

Transmitter has shown to be Temperature
sensible :

Water Temp = 26.4 +/- 0.5

Air Temps = 22.1 +/- 2.6

Driver Gain = 6.7 %

Cold IOT = + 7.5 % to - 38 %

Hot IOT = +/- 4.9 %
Temp water
Relative Gain Driver1

Drivers are inverse temp, while IOT is
direct Temp

Restart a cold IOT must be done
readjusting the drive within the first three
minutes

Eric Montesinos
CERN-RF
Temp water
Relative gain IOT
Temp air
Relative Gain Driver2
Temp air
CERN LLRF will manage these variations
Thursday, 6th October 2011
15th ESLS-RF Workshop
30
5
Long duration tests:
Super Cycle mode

To reduce average power and be closer to machine operation, we
launched Super Cycle long duration tests, new difficulties arose

While doing the test over four weeks, we were not able again to
obtain a stable operation

Time slots were mainly between 12 to 24 hours

The main fault is always the same ‘IGBT 4 gate D’, even with no
amplifier connected !
66
Pout [kW]
Eric Montesinos
CERN-RF
70
60
50
40
30
20
10
0
0
3000
6000
Time [ms]
47

We are convinced the tube itself is not part of the trouble
32
31
26
23 24
19
16
25
20
13
15
12
15
12 12 12
14
5
0.5
Thursday, 6th October 2011
10 9
0.02
0.02
15th ESLS-RF Workshop
8
4
8
31
HVPPS instabilities

We tried a 50% RF signal instead of our super cycle,
varying the repetition rate

The HVPPS stability is function of the repetition rate !
Pout [kW]
Eric Montesinos
CERN-RF
70
60
50
40
30
20
10
0
0
50
100
Time ON [%]
Power converter stability vs Repetition rate
20 hours
10 hours
100 hours
20 hours
10 hours
1000
900
800
Stability [seconds]
700
600
500
400
300
200
100
0
0.1
0.5
1
5
10
50
100
500
1000
1500
1600
Repetition rate [Hz]
Thursday, 6th October 2011
15th ESLS-RF Workshop
1700
1800
2000
2100
2500
32
800 MHZ upgrade Conclusions

First tests were very promising, but…

Long duration tests shown lack of HVPPS stability

We asked for a conventional linear Power Converter (with thyratron crowbar)

Installation is foreseen next week …
Thursday, 6th October 2011
15th ESLS-RF Workshop
Eric Montesinos
CERN-RF
33
Many thanks
For your attention, and for inviting me to your workshop
RF Group at CERN
adio –
Eric Montesinos
CERN-RF
requency
September 2011
Group
A. Cobas, L. Dupont
Group Secretaries
E. Jensen
Dpt. E. Ciapala
FB
BR
Beams and RF
E. Shaposhnikova
Dpt. T.Bohl
T. Argyropoulos (DOCT)
F. Caspers
J. Esteban Muller (FELL)
S. Federmann (DOCT)
L.Ficcadenti (FELL)
S. Hancock
R.M. Holz (TECH)
H. Timko (FELL)
J. Tückmantel
LR
Cavity Servos
& Controls Interface
RF Feedbacks
& Beam Control
Klystrons
& SC Cavities
Linacs RF
Synchrotrons RF
A. Butterworth
Dpt. L. Arnaudon
W. Höfle
Dpt. P. Baudrenghien
O. Brunner
Dpt. G. Mcmonagle
M. Vretenar
Dpt. F. Gerigk
E. Montesinos
Dpt. C. Rossi
L. Arnaudon
D. Landre
S. Totos
M.E. Angoletta
P. Baudrenghien
A. K. Bhattacharyya
(FELL)
J. Ferreira-Bento
G. Hagmann
T. Mastoridis
J. Noirjean
D. Stellfeld
F. Dubouchet
M.Jaussi
J. Molendijk
M. Naon (UPAS)
A. Pashnin (FELL)
A. Rey
F. Weierud
A.Blas
A. Bullitt (UPAS)
H. Damerau
A. Findlay
J. Fox (UPAS)
M . Hernandez-Flano (FELL)
P. Leinonen (FELL)
T. Levens (FELL)
J. Lollierou (FELL)
R. Louwerse
D. Perrelet
T. Truszcynski
D. Valuch
U. Wehrle
D. Glenat
P. Martinez-Yanez
P. Maesen
G. Pechaud
G. Mcmonagle
S. Curt
G. Rossat
A. Benoit (Stagiaire)
I. Mondino (FELL)
C. Nicou
S. Mikulas (TECH)
M .Pasini
J. Pradier
G. Ravida
N. Schwerg (FELL)
M. Therasse (FELL)
W. Weingarten
J. Chambrillon (FELL)
T. Junginger (DOCT)
C. Liao (FELL)
H. Vennekate (TECH)
DOCT = Doct. Student FELL = Fellow SUMM=Summer Student TECH = Techn. Student PDAS= Paid Ass.
J. Broere
V. Cobham
S. Doebert
A. Andersson
W. Farabolini (UPAS)
J-W. Kovermann (FELL)
R. L. Lillestol (DOCT)
S. Livesley
J. Monteiro
S. Rey
R. Ruber (UPAS)
H.S. Shaker (PJAS)
L. Timeo
T. Wiszniowski
A. Boucherie
G. Cipolla
N. Jurado
C. Marrelli (FELL)
C. Renaud
F. Gerigk
N. Alharbi (UPAS)
M. Schuh (UPAS)
P. Ugena-Tirado (FELL)
R. Wegner
W. Wuensch
M. Dehler (PDAS)
N. Shipman (DOCT)
I. Syratchev
A. Grudiev
A. D’Elia (UPAS) G. De Michele (UPAS)
V. Khan (FELL) O. Kononenko (FELL)
J. Shi (FELL)
K. Sjoebaek (PJAS)
H. Zha (UPAS)
G. Geschonke
J.M. Giguet
J. Marques Balula
S. Ramberger
K. Schirm
UPAS = Unpaid Ass. PJAS= Project Ass.
S. Calvo
C. Julie
F. Killing
M. Paoluzzi
C. Vollinger
G. Riddone
A. Acker (UPAS) M.Filippova (PJAS)
A. French (PJAS) N. Gazis (DOCT)
D. Gudkov (PJAS) I. Kossyvakis (TECH)
A.Olyunin (UPAS) P. Piirainen (FELL)
F. Rossi (FELL)
A. Samoshkin (UPAS)
V. Soldatov (UPAS)A. Solodko (UPAS)
J. Vainola (UPAS)
C. Rossi
V. Bretin
V. Desquiens
M. Haase
G. Lobeau
A. Marmillon
M. Morvillo
S. Tavares Rego (UPAS)
Underlined = Supervisors
RF group is 170 colleagues operating RF over all machines
Thursday, 6th October 2011
15th ESLS-RF Workshop
35

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