Injection and beam dump
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Injection and Beam Dump. B.Goddard, V.Mertens, M.Barnes, E.Carlier, F.Castronuovo, L.Ducimetiere, E.Gallet, V.Kain, M.Lamont, J.Uythoven + many, many others. Brief overview of system components and dependencies Breakdown of tests foreseen in preparation for beam

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Injection and Beam Dump

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Injection and beam dump

Injection and Beam Dump

B.Goddard, V.Mertens, M.Barnes, E.Carlier, F.Castronuovo, L.Ducimetiere, E.Gallet, V.Kain, M.Lamont, J.Uythoven

+ many, many others

  • Brief overview of system components and dependencies

  • Breakdown of tests foreseen in preparation for beam

  • Equipment “folder”: tests results, handling of non - conformities, performance below specs, machine as commissioned vs. machine as specified

  • Piquet/Experts availability

2008 Extended LTC


Part the 1 st injection systems

Part the 1stinjection systems

2008 Extended LTC


Injection systems schematic view lss8r

Injection systems: schematic view (LSS8R)

3rd March 2008

2008 Extended LTC

2008 Extended LTC


Injection sub systems

Injection sub-systems

Main injection sub-systems

Injection septa MSI

Injection kickers MKI

Kicker state control and surveillance

Injection protection devices TCDI, TCDIM, TDI, TCDD(M), TCLIA/B, TCLIM

Beam instrumentation BTVs, BPMs, BLMs, FBCTs

Vacuum system

Injection quality checks IQC

Links to other systems

BIS, via the injection BICs and the main LHC BICs

Injection pre-pulse from RF in point 4

LBDS for abort gap keeper and arming inhibit

LHC control system and timing

SLP for beam energy

Vacuum for MKI interlocking and conditioning

TL BCT and special LHC ring BPMs for kicker ↔ beam synchronisation

Major part of transfer lines not included here (… but also being followed up).

3rd March 2008

2008 Extended LTC

2008 Extended LTC


Injection systems ist and hwc i

Injection systems: IST and HWC (I)

Individual System Tests and HWC : making sub-systems work

Septa MSI

Fully commissioned (electrical tests, polarity, water flow, interlocks, heat run … done)

Vacuum chambers baked out

IR2: DCCT still to be re-configured (modification of compensation coil)

Kickers MKI

Major part of commissioning finished – all remotely controllable

HV tested to beyond nominal voltage

Links to external systems being commissioned piecewise, still to test BIS, RF pre-pulses,

IR8: Re-bake MKI interconnects (w14?) to gain in vacuum ( HV performance), followed by short HV test

Inter-tank valves to be (re-)opened as needed for beam operation (not prematurely !)

Beam instrumentation: basically “all commissioned – waiting for beam”, except

BTV: some devices to be finished/recalibrated after bake-out of adjacent equipment

BLM: situation around MSI to be checked (mixture TL / ring or add a few more …)

EMC tests between equipment (kickers, p.converters, cryo, …) scheduled for w12-13

3rd March 2008

2008 Extended LTC

2008 Extended LTC


Injection systems ist hwc results

Injection systems: IST/HWC results

HV pulse testing/conditioning of MKI in LSS2L, with inter-tank valves open (28th Feb 08)

voltage

pulse counter

pulse length

vacuum

pulse form

3rd March 2008

2008 Extended LTC

2008 Extended LTC


Injection systems ist and hwc ii

Injection systems: IST and HWC (II)

Transfer line protection devices TCDI/M

All in place

Some cables to shield against cross-talk from power cables,

Some screws/springs to replace ex-vacuum,

TCDIH87904 to re-align (vacuum intervention w14)

LHC injection Protection devices TDI, TCDD(M), TCLIA/B, TCLIM

IR2 TDI in place (to bake out), IR8 TDI to replace against new model (w14 with adjacent TCTVB), close vacuum, bake-out, NEG activation.

TDI electronics/controls/mechanisms – still to finish in-situ part of commissioning

IR8 TCDDM in place, IR2 TCDD to install (w13 with TCTVB), close vacuum, bake-out, NEG

All TCLIB/TCLIM in place

Vacuum

Rings: under vacuum, bake-out / NEG activation done (with exception of short areas around TCTVB, TDI/TCDD)

End of transfer lines: tested and under vacuum

Organisation: responsibility and coordination

HWC responsible for coordinating IST/HWC carried out by equipment groups: planning, access, safety, impact of cooldowns, EMC tests, …

Strong support from LTI project – providing lubricant in interfaces (as it were)

3rd March 2008

2008 Extended LTC

2008 Extended LTC


Injection systems dry runs

Injection systems: dry runs

  • Dry runs : running injections as a system from CCC

    • Commissioning system links and interdependencies, SW tools, …

    • Possible to already be “fully-connected” to all external systems

    • First dry-run test (2 days) carried out in December 2007

      • Checked B1 and B2 systems in “mostly-stand-alone” mode (no BIS connection, no SLP, no connection to LBDS, no RF prepulse, some timing issues to address)

    • Further 2-day tests planned with increasing scope and complexity:

      • W15: B1 and B2 systems connected to SLP, RF and timing, …

      • W19: links to LBDS, BIS, testing inject and dump modes, …

      • W23: Full set of injection scenarios

    • Organisation, responsibility and coordination

      • Much preparation and mobilisation for HW, controls and SW

      • OP responsible for dry runs: schedule, test, tools, coordinate

      • BT/LTI providing strong support…

3rd March 2008

2008 Extended LTC

2008 Extended LTC


Injection systems machine check out

Injection systems: machine check-out

  • Machine check-out : run injections as embedded systems from CCC

    • Will be “fully-connected” to all external systems (in particular RF, SLP, timing, BIS, LBDS)

    • Re-check all injection scenarios with all interconnects in place

      • Checks of all equipment, SW, sequencing, timing, interconnection, …

      • Will need beam permit from BIS loop, to allow injection kickers to pulse

    • Organisational issues: responsibility and coordination

      • OP responsible for machine check-out, with support from equipment groups and LTI project

      • BT will provide system commissioning team (scheduled or on call as required) + MKI and controls piquet

3rd March 2008

2008 Extended LTC

2008 Extended LTC


Injection systems known issues

Injection systems: known issues

Follow-up of “non-conformities”

Known tight spots – need more formal documentation

Aperture limits at Q5 (tilted), MKI, D2, TDI (informal note JBJ)

Injection line chamber size/position where passing Q6 (informal note JMJ)

MSI alignment and aperture (EDMS 488061)

MKI high-frequency ripple

Net effect on beam being calculated, including action of transverse damper (BG, WH)

Kicker “soft-start” before injection

To mitigate effects of de-conditioning after pause (in parallel with turnaround)

Additions being prepared now (sequencer, modifications of interlocks, …)

Documentation / data bases

Scope of formal change management system to be defined (if any …)

Layout database to be worked on with DB people – finish off some details

Aperture model to be completed and re-checked – TL models ready for DB

Completion of installations

TCLIA in LSS2R/LSS8L in shutdown 2008/09 (“phase II” collimator)

2nd passive absorber upstream of MSI for ultimate beam (to be decided, funded, designed  SD 2008/09 ?)

3rd March 2008

2008 Extended LTC

2008 Extended LTC


Part the 2 nd beam dump system

Part the 2ndbeam dump system

2008 Extended LTC


Injection and beam dump

Dump kicker installations around P6 (B2)

RA/UA67 extraction kicker

generators, cables and magnets

UD62

TD62

RA/UA63 dilution kicker

generators, cables and magnets

UP62

UJ62

UJ63

RA63

UA63

RA67

UA67

UJ67

UJ68

TD68

UD68

UP68

2008 Extended LTC


Beam dump subsystems

Beam dump subsystems

  • Main LBDS subsystems

    • Extraction kickers MKD

    • Extraction septa MSD

    • Dilution kickers MKBH,V

    • Beam dump block TDE

    • Triggering and synchronisation unit TSU

    • Beam energy tracking system BETS

    • Kicker state control and surveillance

    • Passive protection devices TCDS, TCDQ, TCSG, TCDQM

    • Vacuum system

    • Beam instrumentation BTVs, BPMs, BLMs, FBCTs, BSRA

    • Post-operational checking systems IPOC, XPOC

  • Links to other systems

    • BIS loop monitoring and user permit

    • DCCT current from 8 Power convertors (4 RBs, 2 Q4s, 2 MSDs)

    • Revolution frequency from RF in point 4

    • Direct BLM and access system inputs to TSU

    • Synch BPMs for kicker timing

    • Injection system for abort gap keeper and arming inhibit

    • LHC controls system and timing

2008 Extended LTC


Beam dump hw interdependencies

Beam dump HW interdependencies

Direct BLM

Access

IPOC / XPOC

system checks

User Permits (interlocks) from BIS clients

2008 Extended LTC


Beam dump system ist and hwc

Beam dump system: IST and HWC

  • Individual System Tests and HWC : making subsystems work

    • MSD septa : powering tests finished

    • MKD/MKB kickers : testing for past 6 months

      • Now changing to running in remote (fully so after w11)

      • All magnets and generators tested to 7 TeV

      • Final parts being deployed and tested now (TSUs, links to BICs)

    • Beam dump blocks TDE : still to leak-test and put under N2

    • Ring beam pipes : under vacuum, baked and NEG activated

    • Extracted beam lines TD62 and TD68 : tested – need final alignment – MKB vacuum remains a concern

    • Protection devices : TCDQ IST/HWC finishing, TCSG still to do

    • Beam instrumentation : a few BLMs to move, direct BLM VME electronics missing –most ISTs/HWC completed and basically ready

    • Presently (w9-10) making EMC tests between equipment systems

    • Organisation: responsibility and coordination

      • HWC responsible for coordinating IST/HWC carried out by equipment groups: planning, access, safety, impact of 5-6 and 6-7 cooldowns, EMC tests, …

      • Presently a very long-standing and efficient collaboration between all concerned (groups, HWC, LBDS, OP)

2008 Extended LTC


Beam dump system reliability run

Beam dump system: reliability run

  • Reliability run and kicker burn-in

    • Designed to validate some key safety assumptions (SIL calculations)

    • Ideally “Fully-connected” to all external systems

      • Will be possible only very late (RF, BIS, access, DCCTs, …)  machine checkout

      • Not compatible with requirement to run system for ~4 months for statistics

    • Since December 2007 configured and running B1 MKDs in “stand alone” mode, interleaved with ISTs/HWC

      • Internal function generator (BETS simulator) for energy ramp

      • Internal dump trigger

      • IPOC and XPOC operational for data acquisition and analysis

    • From 10th March, configure B1 & B2 systems in “semi-connected” mode

      • BETS simulator ramp triggered by timing system

      • Local beam permit loop connected to LBDS

      • Dumps triggered by timing events via the BIS

      • Access system “beam dump” signal strapped – to be redone for final DSO tests

      • Direct BLM input masked on TSU boards – redone when BLM cards available

      • IPOC/XPOC operational, logging, …

      • Run by sequencer from CCC (arming, state control, timing tables, …)

    • Organisation: responsibility and coordination

      • LBDS project responsible for reliability run: tests, tools, analysis, coordinating with HWC, OP, LSA, …

2008 Extended LTC


Reliability run results 12 07 2 08

Reliability run results (12/07  2/08)

Current [A]

Dumps

Distribution of beam dump energies

(9’376 dumps as of 29/02/08)

Time [ms]

Energy [GeV]

Stability/reproducibility of MKD.B1 kick strength at 7 TeV

Stability/reproducibility of MKD.B1 kick strength at 450 GeV

Kick strength variation [%]

Kick strength variation [%]

±1% variation

±0.4% variation

Specification ±0.4%

Date

Date

2008 Extended LTC


Reliability run results 12 07 2 081

Reliability run results (12/07  2/08)

Rise time of all 15 MKD at 7 TeV

Rise time of all 15 MKD at 450 GeV

Rise time [ms]

Rise time [ms]

Specification

2.7 ms

Date

Date

Stability/reproducibility of MKD.B1 average rise time at 7 TeV

Stability/reproducibility of MKD.B1 average rise time at 450 GeV

Rise time [ms]

Rise time [ms]

22 ns

Date

Date

2008 Extended LTC


Reliability run results 12 07 2 082

Reliability run results (12/07  2/08)

  • Stability and reproducibility

    • Generator kick strength less stable than expected at 450 GeV (measured ±0.4% at 7 TeV, ±1% at 450 GeV). Possible thermal effect being investigated

    • Rise time looks OK – rise time averaged over all 15 MKDs is < 2.72 ms, and for any individual MKD in the range 2.6 - 2.8 ms (c.f. specified 2.7 ms). We have a small 50 ns margin which we will need to eat into…

    • Short-term hysteresis effects on kick waveform measurement transformer? Now deploying 2nd pick-up type and investigating

  • Burn-in and fault statistics (on 30 generators  60 switches)

    • Switches most important elements being tested

    • Calculations predicted 6 broken for 4 months operation of both systems

    • Presently operated B1 for about 3 months with ~50 % duty cycle

    • Total of ~10’000 beam dumps to date (300’000 switch operations)

    • 2 switches broken (pulsing) in July 07  trigger transformer contacts (systematic problem – now should not re-occur)

    • 1 switch broken (under voltage at 7 TeV) on 27/02/08. First real switch failure (note that detection worked  failed safe  synch dump)

2008 Extended LTC


Beam dump system dry runs

Beam dump system: dry runs

  • Dry runs : running LBDS as a system from CCC

    • Commissioning system links and interdependencies, SW tools, …

    • Ideally would be “Fully-connected” to all external systems, but not possible until final machine checkout phase

    • First dry-run test (2 days) carried out in w7

      • Checked beam 1 system in “very-semi-connected” mode

      • Testing and deploying tools needed for operation, and for reliability run from CCC

    • Further 2-day tests planned with increasing scope and complexity:

      • W11: B1 system connected to BIS, RF, LASS and driven via sequencer

      • W15: B1 and B2 systems together, with protection devices

      • W19: links to injection systems, inject and dump modes, …

    • Organisation: responsibility and coordination

      • Much preparation and mobilisation for HW, controls, SW

      • OP responsible for dry runs: schedule, test, tools, coordinate

      • BT providing strong support…

2008 Extended LTC


Beam dump system machine checkout

Beam dump system: machine checkout

  • Machine checkout : run LBDS as embedded system from CCC

    • Will be “Fully-connected” to all external systems – in particular magnet DCCTs, RF and BIS

    • Will need a series of energy ramps (5-10)

      • Check kicker energy tracking with RB circuits

      • Synchronisation with RF revolution frequency

      • Assume can be done parasitically – i.e. some ramps are made before beam…

    • Will need time with the BIS loops closed (1-2 days)

      • Check signal transmission and detection, arming sequences

      • Assume this can be done as part of final beam interlock system commissioning

    • Organisation: responsibility and coordination

      • OP responsible for machine checkout: support from equipment groups and LBDS project

      • BT group will provide system commissioning team (scheduled or on call as required), plus equipment piquets for kicker HW and controls

2008 Extended LTC


Beam dump system known issues

Beam dump system: known issues

  • Follow-up of known non-conformities (some correctable…)

    • Known changes w.r.t. original specification

      • BI and protection element tilt sign errors (ICC report from TS/SU)

      • Horizontal offset of MKBs and BCTs (EDMS 849665)

      • MKD second beam chamber offset (EDMS 859393)

      • Non-standard TD line chamber sizes for Q4/Q5 integration (EDMS 671966)

      • Absence of RF shielding transitions in a few locations (EDMS?)

      • MSD and TCDS alignment and aperture (EDMS 631718)

  • Kicker performance still being qualified in reliability run

    • MKD magnet kick strength variations (under investigation), rise time tight

    • Number of switch failures to date looks OK

  • Change management system needed for dump kicker system

    • Magnets/chambers/generators/switches/delays/lookup-tables/…

    • To be worked out with layout DB people

  • Completion of installations/correction of NCs planned

    • Installation of staged MKB kickers for LHC phase II (08/09 shutdown)

    • Final TDE N2 handling system (08/09 shutdown?)

    • Vacuum transitions – when sectors opened, or SD before high intensity operation

    • Tilt errors - when sectors opened

2008 Extended LTC


Part the 3 rd common comments

Part the 3rdcommon comments

2008 Extended LTC


Documentation

Documentation

MKD

7 TeV

30.12 kV

30.3 kV

  • Required documentation should be easily available for injection and dump systems, as relevant:

    • Installation drawings and layouts ~complete

    • Equipment drawings and parameters~complete

    • Optics files and aperture models partial

    • Alignment information ~complete

    • Expected bunch positions on BPMs and BTVs ~complete

    • MKD/B lookup tables to formalise

    • XPOC references and tolerances needed

    • Kicker calibration, test and reliability run data partial

    • Equipment config. (generators, switches, magnets, …) to formalise

    • Arming and state descriptions partial

    • Interlock references (protection devices, interlock BI,…) partial

    • Non-conformity documents partial

  • No single repository (layout DBs, CDD, EDMS, LSA, Geode, …)

2008 Extended LTC


Snapshot of commissioning status

Snapshot of commissioning status

Injection

Beam dump

2008 Extended LTC


Coordination aspects

Coordination aspects

  • Clear separation of commissioning phases would be nice (as on paper)

    • Too idealistic

    • In reality the boundaries are very blurred: overlap of last installations, bug fixes, IST, HWC, dry runs, …

    • Additional constraints from equipment tests, cool-down, …

    • Coordination is a long-standing, efficient collaboration between all concerned (groups, HWC, LTI/LBDS projects, ABP, OP, …)

  • Organisation of commissioning teams and support

    • BT, OP and other groups’ experts already heavily involved and will form backbone of system commissioning teams: will be available on scheduled and unscheduled basis until beam commissioning is finished

    • BT piquet service will be in place for all LHC kickers (magnets, generators and controls) for machine checkout and beyond

2008 Extended LTC


Conclusion

Conclusion

  • Injection systems and beam dump system are progressing well through the commissioning phases

    • Seriously blurred boundaries but under control

    • All components tested to full strength with no major problems

    • Connections to other systems are being brought on-line

    • Operation from the CCC has started

    • Strong system commissioning teams are being forged

    • A lot left to do, but (barring disaster) systems will be ready for first beam

2008 Extended LTC


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