ELENA: Commissioning operation ELENA beam commissioning Operation 12/11/2015T.Eriksson CERN BE/OP/AD1

T.Eriksson CERN BE/OP/AD 1

ELENA:Commissioning & operation• ELENA beam commissioning

• Operation

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General planning

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General installation planning

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Commissioning key dates (baseline)So far and imminent:

• AD ejection line modification & validation: completed / in operation

• Kicker pulse generators tested• Ion source installation & initial tests: completed• Ion source & Ion switch commissioning: early 2016

(Feb/Mars.)• 1:st part of AD to ELENA transfer line: could this be

done during 2016 AD start-up ?(April.) EPC/Vacuum ?

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Beam commissioning key dates (baseline)

• ELENA ring HW installation & tests completed by 5/7/2016– All equipment tested incl. controls/SW

• Ring commissioning with Ions & Pbars (ppm) 5/7 – 14/11 2016; ~ 4 months. Pbar shift plan with AD users

• Ion operation could continue >14/11 if compatible with shutdown work

• 2016 physics run ends 14/11, by this date we will know more about:– Deceleration efficiency– Beam cooling performance– Emittances– Lifetime

• => decision point for new ejection line installation

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ELENA setting-up 1

• 100 keV protons @ 1 Hz, ring in normal polarity & reverse direction:– Finalise set up of xfer line from source: need BTV:s, BPM– First injections & circulating beam: need ring BPM:s, tune msmnt, Schottky

system– Orbit/tune/coupling/chromaticity: validation of systems, corrections: need

RF– Acceptance check/studies: need scraper system– Lifetime/blow-up rates– Lattice validation with orbit response msmnts– Study effects of e-cooler solenoids– Acceleration tests & ramp corrections: further RF setup needed incl. B-train– Repeat at intermediate & top plateau

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ELENA setting-up 2• 100 keV H- @ 1 Hz, ring in normal polarity & normal

direction:– Set-up e-cooler– If H- lifetime is too short: use protons, ring in reverse polarity &

normal direction, additional corrections might be necessary later for pbar operation due to remanence effects

– Recombination detection (protons), additional tool for alignment/tuning

– Extensive use of scraper system for profile and emittance msmnts– Schottky analysis for long. Emittances– Cooling time studies– Lifetime/blow-up rates

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ELENA setting-up 3

• 100 keV protons or H- @ 1 Hz, ring in reverse or normal polarity & normal direction:– Initial setting-up of the extraction and ejection

lines (only short sections installed at this stage for main and GBAR lines)

– Need u-wire monitors + high sensitivity intensity msmnt pickup in lines

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ELENA setting-up 4

• 5.3 MeV pbars @ .01 Hz, ring in normal polarity & normal direction:– Set-up transfer line from AD : need BTV, GEM,

TFA7049, BPM. (optics validation)– RF synchro s-u for bunch to bucket transfer– Ramp studies: orbits, tunes, slope– Further e-cooler set-up– Set-up of nominal cycle; obtain nominal emittances– Bunched beam cooling @ extraction

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ELENA setting-up 5• Further studies with pbars: • Space charge studies on higher intensity bunches

(extraction on lower harmonics); compatibility with ejection lines

• Deceleration efficiency > 60% ?• Synthetic B-train, validation for use in regular operation

• => ELENA ring commission complete– ~4 months total time available– Overly optimistic ?

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ELENA setting-up 6

• New transfer lines: 18/8 – 10/10 2017• 100 keV pbars or H-– Setting-up of ~ 100m electrostatic xfer lines– u-wire “semi-non-destructive” profile monitors– Set-up of deflectors used for fast switching

between experiments– Set-up of beam request/distribution SW/HW

• 2 months available

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Operation Sequencing 1/3

Based on ADE sequencing conceptsELENA will have a virtual super cycle ELENA cycle can be:

• Coupled to the Production Chain (beam from ADE)• Standalone mode (beam from source)

Goals Optimize the beam request in the beam production chain Maximize the beam availability for experiments Maximize the MD beams

Bunches destination «On Demand» and prioritized

ELENA Project Review - S.Pasinelli CERN BE/OP12/11/2015

Sequencing 2/3

12/11/2015 ELENA Project Review - S.Pasinelli CERN BE/OP

Sequencing 3/3


ELENABeam Request Server

Experiments request

External conditions

Request Cycle

Human controls

ELENA Central TimingADE

Beam Request Server ELENA Local Timings

Experiments Schedule&

Priorities

Bunches Extraction Timings


B1 B2 B3 B4

EJ Timing

T1

T2

T3

T4

Matrix

Ta Tb Tc ThTd Te Tf Tg

EXPA

EXPB

EXPC

EXPD

EXPE

EXPF

EXPG

EXPH

Constrains

• No more action on the ADE from experiments• Enable/disable extraction kicker

• Static settings in the Common Transfer Lines



OperationManpower

• Commissioning (immediately after AD start-up):– Op-team will work from ACR– AD start-up/operation + ELENA commissioning in 2016– 2 shifts per day can be covered, (weekends) by team of 7/8– Eq. specialists will also participate (EN, TE, BE/ABP etc.)– External help is welcome, discussions underway.

• Once AD/ELENA operational stability obtained:– Machine supervisor from BE/AD/OP team will look after the machines during

day-time and be on-call on weekly basis 24h/24, 7d/7– BE/OP/PS section will do routine operation + initial troubleshooting from the

ccc during nights and weekends– Equipment groups ensure “piquet” or best-effort coverage– Note: yearly AD start-ups are very time-consuming, with ELENA even more so

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Documents

ELENA: Commissioning operation ELENA beam commissioning Operation 12/11/2015T.Eriksson CERN BE/OP/AD1