RF and Transverse Dampers Current Systems Wolfgang Hofle W. Hofle - RF+Dampers - R2E and Availability Workshop 14-17 OCtober 2014 1 Acknowledgements: RF.

W. Hofle - RF+Dampers - R2E and Availability Workshop 14-17 OCtober 2014 1

RF and Transverse DampersCurrent Systems

Wolfgang Hofle

Acknowledgements: RF group, Section Leaders and Deputies

Special Thanks to L. Arnaudon, P. Baudrenghien, A. Blas, T. Bohl, A. Butterworth, H. Damerau, F. Gerigk,

P. Maesen, E. Montesinos, M. Paoluzzi, C. Rossi, D. Valuch, U. Wehrle

Disclaimer: 15 minutes to cover … 2035


Name LHC / LHC injector

Radiation from

Particle Type of exposed

electronics

R2E known / expected

Mitigation

LINAC2 yes - p - no R2E issues expected

-

LINAC3 yes Beam losses Ions (Ar, Pb, …)

PLC, D, A, P no R2E issues expected for Pbradiation levels with Ar are high

Study advised ?Relocation ?

LINAC4 yes Cavity Conditioning

H- A no R2E issues/risksexcept arc detectors

New type of arc detector being deployed, rad tests ?

AD, ELENA no Cavity conditioning

pbar - no R2E issues expected

-

LEIR yes - ions - no R2E issues expected

-

HIE-Isolde, Isolde

no Cavity conditioning

ions - no R2E issues expected

-

CTF3/CLIC no e- (e+) PLC, A, D ? no planned activities known

Accelerators and Projects involving RF (1)

Types of electronics: PLC, analogue (A), digital (D), RF power (P)


Name LHC / p-LHC

injector

Radiation from

Particle

Type of exposed

electronics

R2E known / expected

Mitigation

PS Booster yes Beam losses p A, P R2E solid state amplifiers

pick-up electronics (RF)

study / development ongoing (M. Paoluzzi et al.)

PS yes Beam losses p , Ions

A, P R2E: solid state amplifiers

pick-up electronics (BI)

study for finemet cavity for long damper

shielding 40 MHz / 80 MHz drivers

SPS yes Beam losses p, Ions

A, P R2E: solid state amplifiers

pick-up / beam observation electronics

upcoming stud, measurements and tests

for Highbandwidth Feedback system: solid

state amplifiers

LHC yes Beam loss, cavity

conditioning(tunnel)

p, Ions

PLC, A, D, P arc detector electronics and in HiLumi era

Beam observation (tunnel+UX45)

study advised for HiLumi:calculations,

measurements, tests, relocation

(tunnel+UX45)

Accelerators and Projects involving RF (2)

Types of electronics: PLC, analogue (A), digital (D), RF power (P)


RF waveguide Arc Detector (1)

D. Valuch et al.This is also a Technology Transfer Project

Photo-diodeamplifier

Waveguideport

Detectorview angle

Interlock

Waveguidesystem

Optional external logic

Photo-diodeamplifier

Waveguideport

Opticalfibre

Testlamp

Detectorview angle

2nd channel

Detectorlogic

Inte

rloc

k

Waveguidesystem

protects transmission line system sensitive RF elements (ceramics, ferrites) based on optical detection

currently deployed system in LHC optical fibers suffer radiation damage interlock logic to mitigate spurious

triggers put in place, no more problem in 2012 run

new system, being deployed in LINAC4gradually to be migrated to LHC no fibers four redundant detectors, voting logic “sun glasses” to blind-out showers future rad testing envisaged to level expected for HiLumi needs to be in tunnel alternative: acoustic detector

current

new

spurious triggers rad damage


RF waveguide Arc Detector (2)

detector box

logic box

new arc detector deployed in LINAC4 reliability testing in LINAC4 many outside labs expressed interest manufactured in industry under license future radiation testing envisaged need estimate of dose rate in tunnel for HiLumi era close to cavities


“Finemet” is a magnetic alloy high permeability potential to replace ferrite based cavity

systems in injectors by wideband systems without need for a tuner

LIU project proposes: a finemet based system for PSB

(replacing the C02 and C04 RF tetrode systems)

a wideband long. damper for PS

Solid state amplifiers for Finemet Cavities PSB RF and PS long. damper (1)

„Finemet Review“ 9-10 September 2014 (LIU)http://indico.cern.ch/event/315998/timetable/#20140909.detailed

10

100

1000

1.E+05 1.E+06 1.E+07 1.E+08

Ω

Freq [Hz]

XC

1 core

2 cores3 cores

series of ceramic gaps powered by individual

amplifiers modular design fast feedback requires

proximity to cavity and beam electronics exposed to

radiation

M. Paoluzzi et al.

R F i n

G a p


Solid state amplifiers for Finemet Cavities PSB RF and PS long. damper (2)

„Finemet Review“ 9-10 September 2014 (LIU)http://indico.cern.ch/event/315998/timetable/#20140909.detailed

design of amplifier in house at CERN based on experience with transistor in

similar applications drift of bias characteristics compensated

by circuit to mitigate ageing by radiation radiation tests at JPARC (Japan) and

Fraunhofer Institut in Germany

solution with Shielding has been studied and deployed for SS02 in PS

tube amplifier would be alternative … but design with many gaps adapted to solid state amplifiers

tubes used in LEIR and JPARC (Japan) collaboration with JPARC for solid state

system

• integrating effect of radiation• compensating circuit being tested

shielding PS SS02 for long. damper

cavity

amplifiers


Solid state amplifiers for PS-RF (40 MHz & 80 MHz)

Annexes for electronicsAnd feedback amplifiers


Solid state amplifiers for PS-RF(40 MHz & 80 MHz)

Doses in Gy


Solid state amplifiers for PS-RF (40 MHz & 80 MHz)

Shielding put in place (LS1)


Pick-up electronics in tunnel(PSB, PS, SPS LSS3)

PSB (RF resp.)head amplifierstransverse feedbackRF loopsregular maintenance

PS (BI resp.)head amplifierstransverse feedbackRF loops

SPS LSS3Beam observation equipment, RF pick-ups

if re-design more rad. monitoring may be needed to get levels for specifications

Example: SPS pit equipped with Beam Observation equipment in SPS LSS3 (U. Wehrle)


Pick-up electronics in tunnel(SPS Damper LSS2)

electro-static PUswith high impedance preamplifiers in tunnel

LS1: electronics moved from208, 209 , 210, 211to newly installed PUsat 202, 204, 205, 207all checked and repaired(R. Louwerse/G. Kotzian)

spare electronics remainsin tunnel (hot spares)@212, 213, 214, 215 pit equipped with damper electronics

for fixed target beam, very reliable & robust (20+ years)(future renovation envisaged, outside LIU scope)100 MHz bandwidth, discrete transistorspower supplies need regular changing

rad monitoring radiationbefore redesign ?


High bandwidth FeedbackSolid State Amplifiers in LSS3 of SPS (1)

R&D project to demonstrate damping of headtail motion in SPS (e.g. ecloud) funded by LARP and LIU SPS decision in 2016 on full deployment solid state amplifiers 4x100 W installed since 2011 under QD319 driving BPW pick-up as kicker radiation damage to power supply mitigated by change of power supply powering of amplifiers only during MDs

tunnel


High bandwidth FeedbackSolid State Amplifiers in LSS3 of SPS (2)

new amplifiers for next stage jointly with SLAC selected amplifiers from R&K Japan (4x200 W) Installation in tunnel to power new kickers radiation measurements ongoing to decide on installation location

later stage (>2016) if full system deployment more amplifiers need for proper radiation measurements, testing, calculations, started

existing amplifiers (QD319) new stripline kickers in 321


LHC: Summary of equipment underground Tunnel:

Cavities with arc detectors ADT tetrode amplifiers (considered robust) APW pick-ups (re-design due to losses for HighLumi ?)

Cryo side of UX45: beam observation equipment for long. plane digitizers, VME hardware, timing, fiber optic links relocation to ex-LEP klystron gallery for HiLumi era

Cavern side of UX45 considered ok: Klystron related drive and controls Faraday Cages with fast feedbacks and cavity tuning ACS cavity controls ADT drive and control

• layout is result of radiation simulations, e.g. LHC Project Note 342• all radiation issues needs re-consideration for HighLumi era• measurements also would be highly appreciated, deploy in EYETS ?


LHC point 4 – UX45 cavern

Radiation sources: X-rays from cavity conditioningBeam-gas interaction

chosen location insideFaraday cages

rack locationBeam observationrelocationfor HighLumi

24 m 5 m

two shieldingwalls + chicanes

Klystron related

Faraday CagesLLRF, feedbacks

ACS cavity PLCs

ADT drive/PLCs

APW observation

arc detectors


Availability – LS1See P. Maesen at 2013 Workshop on Availability and Dependability

availability of RF in run 1 not driven by R2E part of big 4 for lost Physics hours mitigations in place and being followed-up for non-R2E

ACS (400 MHz RF) arc detectors (this was R2E) crawbar, new development, see G. Ravida et al., IPAC’12 THPPD056 klystron filament current: bad HV cables, connector weldings ACS Module exchange, driver amplifiers klystrons exchanged and klystron cooling fixed

ADT (transverse damper) cabling replaced electronics upgrade, electrical contacts power system maintenance and fixes, air cooling improved new water cooling interlocks vacuum interlocks

SR4 air conditioning and temperature stabilization in RF zone (roof)


Summary and final thoughts

• most of R2E issues for RF are in injectors, need follow-up

• R2E in injectors not related to HighLumi LHC (radiation driven by non-LHC beams)

• impact of R2E on availability in injectors if failure of equipment

• UX45 cryo side equipment likely needs re-location for HighLumi era

• document evolution of radiation levels in UX45 with measurements

• with RF and LHC, LHC RF caused a significant number of lost hours during run 2

• driving problems for LHC RF availability haven been addressed in LS1

• on time horizon of 2035 ageing of material related to radiation has to be addressed through consolidation continuously

• availability tracking tool highly appreciated

• only the tedious search & elimination of root causes will increase availability

• worth to re-check 2012 RF faults statistics in LHC (more time needed)

RF and Transverse Dampers Current Systems Wolfgang Hofle W. Hofle - RF+Dampers - R2E and Availability Workshop 14-17 OCtober 2014 1 Acknowledgements: RF.

Documents

hofle rf dampers r2e

rf group

finemet cavities psb

rf power p slide

rf waveguide arc detector

availability workshop

c04 rf tetrode systems

finemet based system