Feedback and Beam Control Section (FB) Activities and Highlights 2014 Outlook Wolfgang Hofle FB...

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


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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 …


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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

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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


5

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:


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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


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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


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


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

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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


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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


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


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


I+

I-

Del

ta IF

to

digi

tal b

oard

Gain control

0°

90°

Q+

Q-

LO2200MHz

ADC

ADC


- 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


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


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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


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LHC Damper – ADT – preparations for Run IIPickup

Q7

Beam position module

Q7

Pickup Q9


Q9Analogue output to the power amplifiers

Digital signal processing unit

DAC

Gain control (CCC)

CLEANING

DAC

Pickup Qx


Qx

Pickup Qx


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)


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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


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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 !

Feedback and Beam Control Section (FB) Activities and Highlights 2014 Outlook Wolfgang Hofle FB...

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