FB Section at 2014 RF Group Meeting - December 2014
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Feedback and Beam Control Section (FB)Activities and Highlights 2014
Outlook
Wolfgang Hofle
FB Section at 2014 RF Group Meeting - December 2014
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Feedback and Beam Control Section Involved in most accelerators
• 20 staff members, 2 Fellows, 1 COAS (December 2014)• Visitors from collaborations
Responsibilities• Operation of feedback systems• Machine development work• Conceptual design of RF and feedback system• Design of hardware and FPGA firmware • Project follow-up
Collaborating with all sections of the RF group• SRF, BR, CS, LRF, MK, PM, IS
Despite many slides: Please forgive me if your favourite project is not included
Many thanks to all the colleagues who provided me with input to this presentation… I had to shorten some of the input …
FB Section at 2014 RF Group Meeting - December 2014
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Coming out of LS1 - Start-up 2014
PSB PS
LEIR
ADSPS
Naturally a lengthy start-up and short Accelerator Run
CTF3, XBOX, SM18, LINAC4 !
RF group
meeting 201
4
Linac4 LLRF
J. Noirjean, J. Galindo, D. Stellfeld, G. Hagmann, P. Baudrenghien , M. Ojeda
May 2014
Cavity Filling Ramp (50 ms)
Feedback On
Zoom
Installed on RFQ, Bunching cavities 2-3, DTL1 Observed ripple: 0.06% voltage, 0.05 deg,
without beam Transient beam loading: 1% voltage with 8
mA beam Pulse to pulse reproducibility: +- 0.05 deg
FB Section at 2014 RF Group Meeting - December 2014
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New PSB Digital LLRF system• Four operational Digital LLRF systems (Ring 1 to 4) + development ring (ring 0) which operates
Ring 4 beams in PPM with Ring 4 DLLRF.• Big RF group investment (manpower) for Meyrin machines. • PSB operational LLRF after LS1• Mandatory for PSB Finemet R&D campaign (2014-2015).• Will be deployed in LEIR in 2015 and in ELENA in 2016.
The hardware
The people
The results
DLLRF operation for PSB Finemet R&D PSB Finemet tests started in 2014: “Ring 0” DLLRF controls voltage (amplitude + phase loop @ 4 harmonics so far) in 10-cells Finemet cavity installed in PSB ring 4 (up to 7 kV).
~800E10 protons accelerated with Finemet as C02 (@h=1, 7kV) + C02 (2.3kV) & C04 (8 kV).
650E10 protons accelerated with Finemet alone as C02 (@h=1, 7 kV).
790E10 protons accelerated with C02 (8 kV) + Finemet as C04 (@h=2, 7 kV) + C16.
Finemet used as C04:
Finemet alone:
Finemet used as C02:
FB Section at 2014 RF Group Meeting - December 2014
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CERN-MedAustron collaboration (HLRF + LLRF)
• Successfully delivered & contributed to commission Digital LLRF (PSB-style) + HLRF (Finemet-based ) systems for MA synchrotron.
• MA milestones so far:
• LLRF team to keep supporting MA Ring RF system when possible.
26 May ‘14: first capture 20 Oct ‘14: first extraction to IR3 @62.5 MeV 6 Nov ‘14: 10E8 protons extracted to IR3 @250 MeV
MedAustron synchrotron
Irradiation Room 3 (IR3)
MedAustron complex
M. E. Angoletta, M. Jaussi, J. Molendijk, M. Paoluzzi, J. Simonin, J. Sanchez Quesada
FB Section at 2014 RF Group Meeting - December 2014
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• RF group heavily involved in ELENA RF workpackage:• Schottky longitudinal PUs (ring + transfer lines) & data processing• HLRF (Finemet)• Digital LLRF.
• ELENA technical design report published in 2014. • Good progress so far but lots to do in 2015. First beam: April 2016!!• AD to be consolidated after ELENA and to profit from ELENA’s developments.
ELENA and AD
FB Section at 2014 RF Group Meeting - December 2014
PS – RF Controls Renovations
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During… Completed
® Commissioned and fully operational since start-up 2014
• New controls front-ends for PS beam controls• Part of ACCOR Project: collaboration with CO group• Relocation of equipment• Digital distribution of voltage programs new ‘matrix’ for 10 MHz system
Vprog
Vdet
Loop error
RF gap500 mV/div
200ms/div
100 mV/div
5 mV/div
LHC25NS_12b
10 MHz AVC
H. Damerau, V. Desqiens, D. Perrelet
FB Section at 2014 RF Group Meeting - December 2014
PS: Performance with 1TFB
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Almost nominal intensity
1.3·1013 ppp
FB off FB onGFB = 2
Gap relays open +
1TFB off
Zoom on beam induced voltage
1TFB on
H. Damerau, S. Hancock, D. Perrelet
PS AD beam batch compression
RF group
meeting 201
4
SPS LLRF – frequency program
New frequency program◦ Replaces the module installed in 1998 (that replaced a 1983 module…)◦ Full ppm operation
Upgraded Master DDS for ions◦ Reduced RF noise. The triangular shape of bunch intensity and bunch length along the SPS
batch was traced to IBS and RF noise during the long SPS injection plateau◦ Should be better in 2015…
A. Pashnin, J. Bento, D. Stellfeld, J. Noirjean, P. Baudrenghien
J. Bento, D. Stellfeld, T. Bohl, P. Baudrenghien Bunch length in the LHC after
Pb filling, M. Schaumann, BE-ABP, presented @ LMC Feb 13th, 2013
FB Section at 2014 RF Group Meeting - December 2014
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Ar-Ion beams: a challenge from LEIR to SPS via PS
frev Ar11+
B-train reception for PS Ar frequency programusing “White-Rabbit”
Ions are always special, and Argon is even more special !
Modulation of RF at 4xfrev for Ar capture in SPSFSK and AM of RF
In FB Section for longitudinal plane: M. E. Angoletta, P. Baudrenghien, H. Damerau, J. Ferreira, A. Findlay, D. Perrelet, U. Wehrle
RF(AM)
FSK
beamBdot
FB Section at 2014 RF Group Meeting - December 2014
PS,PSB,AD,LEIR – Transverse Feedback
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PLC in the PSB -> identical in PS, LEIR, AD
David2 + Luca
PSB water cooling -> identical in PS, LEIR, AD
Ali Dridi
Safer water distribution with better diagnostic and controlAll the PS, PSB, AD and LEIR damper’s cooling system rebuilt and connected to a PLC system Water leak detection and automatic shut-down.
New LL and power electronics to be delivered in the transverse feedback systems of the PS and PSB in 2015
Better diagnostic and control of power equipment:All the PS, PSB, AD and LEIR damper systems equipped with PLC control
Better monitoring:All the PS, PSB, AD and LEIR dampers connected to OASIS
Ready for the L4 era in the PSB:15 racks reinstalled and ready for the upgraded electronics
AD damper system entirely moved to a more convenient location with a total re-cabling
A. Blas, A. Findlay, R. Louwerse
FB Section at 2014 RF Group Meeting - December 2014
SPS – Damper (transverse feedback)
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Hybrid H9
Gau
ssia
n ty
pe lo
w
pass
, fc=
40M
Hz
I+
I-
Sum
IF to
di
gita
l boa
rd
Comb filterfcenter = 200MHZ4 pulses (20ns)
Delay equalization
D
SA
B
Coax lineTunnel-BA2
(300m, 7/8" Flexwell)
Stripline pickupfcenter = 200MHz
beam
4-way
4-way
0°
90°
Q+
Q-
ADC driverGain
Diplexer
<400MHz
>400MHz
Diplexer
<400MHz
LO1200MHz/
IF -
3 (0
) dB
m
ADC
Dual 16bit ADCVin 1-2Vpp
Vcm = 0.7-1.25VDDR CMOS out
ADC
- 16 bit data- 1 bit ovf- 1x ENC clock- 1x /CS- 2x SCK+SDI
I+
I-
Del
ta IF
to
digi
tal b
oard
Gain control
0°
90°
Q+
Q-
LO1200MHz
ADC
ADC
- 16 bit data- 1 bit ovf- 1x ENC clock- 1x /CS
Hybrid H9G
aus
sian
typ
e lo
w
pass
, fc=
40M
Hz
I+
I-
Sum
IF to
di
gita
l boa
rd
Comb filterfcenter = 200MHZ4 pulses (20ns)
Delay equalization
D
SA
B
Coax lineTunnel-BA2
(300m, 7/8" Flexwell)
Stripline pickupfcenter = 200MHz
beam
4-way
4-way
4-way
4-way
Gain control
0°
90°
Q+
Q-
ADC driverGain
Diplexer
<400MHz
>400MHz
Diplexer
<400MHz
LO2200MHz
IF -
3 (0
) dB
m
ADC
ADC
- 16 bit data- 1 bit ovf- 1x ENC clock- 1x /CS
I+
I-
Del
ta IF
to
digi
tal b
oard
Gain control
0°
90°
Q+
Q-
LO2200MHz
ADC
ADC
- 16 bit data- 1 bit ovf- 1x ENC clock- 1x /CS
- 10 bit data- 1 bit WR
- 1 bit WR
- 1 bit WR
- 1 bit WR
200MHz LO2 in
Firmware
t
t
t
t
- 1 bit /CS
- 1 bit /CS
- 1 bit /CS
DAC1- 16 bit data
- 1x /CS- 2x SCK+SDI
t
DAC2- 16 bit data
- 1x /CS
t
- 1 bit WR
- 1 bit switch
120 MHz clocks
DA
C Gain control
- 1 bit switch
DA
C
- 1x /CS- 2x SCK+SDI
Module 1 outputH1 (or V1)
Module 2 outputH2 (or V2)
4-way
4-way
Gain control
200MHz LO1 in
ADC1 ADC2 DAC1 DAC2
ADC2 CLK 120 MHz
ADC1 CLK 120 MHz
DAC2 CLK 120 MHz
DAC1 CLK 120 MHz
G. Kotzian, T. Levens, D. ValuchA. Rey, Y. Le Borgne
4xnew Board120 MHz clocked
Dec 12th, 2014
RF group
meeting 201
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One-Turn delay feedback added on TWC800MHz Cavity 1 for compensation of transient beam loading
3 MDs performed in Autumn 2014
LIU SPS: LLRF for 800 MHz TWC (1)
G. Hagmann, P. Baudrenghien, D. Valuch, S.J. Calvo
Cavity Vector sum (37 cells)
RF group
meeting 201
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LIU SPS: LLRF for 800 MHz TWC (2)
G. Hagmann, P. Baudrenghien,T. Bohl, M. Ojeda, A. Rey, F. Killing, J. Noirjean
Amplitude and phase of measured cavity voltage (800MHz)
Very effective compensation of the transient beam loading
RF (800MHz) demod to IF (25MHz) ADC’s & Digital IQ (BW=12MHz) FPGA:100MSPS signal processing DAC’s & SSB Modulator to RF ≤3.2Gbits/s links (SFP)
Nov. 26th, 2014
FeedbackGain=1
Feedback Gain=25
RF group
meeting 201
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HiLumi LHC WP4: Crab Cavities (CC)
Transverse emittance growth caused by CC RF noise can reduce the integrated luminosity much
Formulas have been derived for the effect of phase and amplitude noise, with and without transverse feedback
The dominant noise comes from the LLRF demodulator that must be improved: target=-149 dBc/Hz @ 3 kHz offset.
For all betatron bands, the demodulator noise dominates the TX noise (filtered by cavity).
100 kHz regulation band
T. Mastoridis, P. Baudrenghien
FB Section at 2014 RF Group Meeting - December 2014
18D. Valuch , M. Elias, M. Mician
HIE Isolde LLRF InstallationHIE Isolde• only 16 meters long, but 32 superconducting cavities• challenge to control the cavity, only few Hz
bandwidth, all field changes have to be super-adiabatic in order not to lose the cavity due to Lorentz force detuning
• LLRF entirely digital, direct RF sampling, direct RF generation
• 32 solid state RF amplifiers, 700 W each• Traditional Faraday cage replaced by “Racks Faraday”• Linac cabling campaign finished November 2014• commissioning planned to start in summer 2015
“Racks Faraday” Linac “tunnel”
Power amplifier racks
FB Section at 2014 RF Group Meeting - December 2014
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LS1: LHC LLRF: SR4 enclosure
Enclosure of the LHC LLRF zone in SR4 (Beamcontrol, ADT, Beamobservation) Private AC system with regulation of temperature and humidity Decided in 2007…realized in 2014 A/C under commissioning
D. Stellfeld, EN-CV, EN-MEF, EN-EL
Shutdown coming to an end for LHC, too
FB Section at 2014 RF Group Meeting - December 2014
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LHC Damper – ADT – preparations for Run IIPickup
Q7
Beam position module
Q7
Pickup Q9
Beam position module
Q9Analogue output to the power amplifiers
Digital signal processing unit
DAC
Gain control (CCC)
CLEANING
DAC
Pickup Qx
Beam position module
Qx
Pickup Qx
Beam position module
Qx
DACBeam transfer function meas.
Observation box
Tune/instability
diagnostics box
Fast b-by-b Instability
diagnostics
CCC, users, logging
800 1000 1200 1400 1600 1800 2000 2200-1000
-800
-600
-400
-200
0BPOS-Q7-H-B2
Delta
G. Kotzian, D. Valuch
Injection of LHC beam
Stable bunches
oscillatingbunches
Transverse oscillations from ADT
I (400 MHz)
Q (
400
MH
z)
FB Section at 2014 RF Group Meeting - December 2014
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LHC LLRF: controlled noise injection
Studies on the use of colored noise to shape the longitudinal bunch profile (heating, stability and longitudinal blow-up)
LHC RF phase noise generation, phase loop, and bunch length feedback implemented in the BLonD code
First simulations of controlled longitudinal emittance blow-up during the ramp confirm a rounder bunch core and low tail population
H. Timko, E. Shaposhnikova, P. Baudrenghien
Initial Final
FB Section at 2014 RF Group Meeting - December 2014
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FB Section Significant contributions cont.
• CTF3: exploitation• XBOX: structure testing• Preparation of AWAKE (Plasma Wakefield Acceleration)• R&D for GHz transverse feedback in SPS
Many Thanks to all !
Stay tuned for 2015 Highlights !