Beam losses in the clic drive beam specification of acceptable level and how to handle them
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Beam losses in the CLIC drive beam: specification of acceptable level and how to handle them. ACE 2010 02 04 Michael Jonker. Beam loss detection and Radiation issues. (in the main tunnel). BLM system primary purpose: detection of onset of slow losses.

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Beam losses in the clic drive beam specification of acceptable level and how to handle them

Beam losses in the CLIC drive beam: specification of acceptable level and how to handle them

ACE 2010 02 04Michael Jonker


Beam loss detection and radiation issues in the main tunnel
Beam loss detection and Radiation issues. (in the main tunnel)

BLM system primary purpose: detection of onset of slow losses.

Operational beam loss background levels:

  • Tails on the beam entering the main linac and decelerators

  • Interaction with residual beam gaz.

    Loss levels limits

  • From Beam Physics: 0.1 % main beam, 0.1% each drive train

  • From Radiation damage over the lifetime of CLIC (1MGy/year see following slides)

    Hence, these limits will define the required vacuum performance

  • Resolution at operational background levels 20 % ?

    Dangerous level of beam loss when 10-2 of DB or 10-4 of MB is lost on an single aperture restriction. (Rough estimate needs further detailed simulations)

    Extended range for catastrophic (fast) losses: diagnostics only. (i.e. to better understand what happened, if ever something should happen)


Effect of beam in matter
Effect of beam in matter

  • Note:in energy density in cupper for Melting : 400 J g-1, Structural yield 62 J g-1

    Material C Al Cu W

  • LEP Beam (100GeV, 445 nC)

  • Energy Density @ shower core [J g-1] 0.64 1.68 22 112

  • Energy Density @ IB 0.1 mm2 [J g-1] 778 719 624 510

  • CLIC Main Pulse (1.5 TeV, 186 nC, @ collimators)

  • Energy Density @ shower core [J g-1] 3 9 122 614

  • Energy Density @ IB 40 mm2[J g-1] 8.3 105 7.7 1056.7 1055.4 1052.2 103 /bunch

  • CLIC Main Pulse (2.8 GeV, 204 nC @ DR septum)

  • Energy Density @ shower core [J g-1] 0.01 0.03 0.34 1.6

  • Energy Density @ IB 125 mm2 [J g-1] 2.3 105 2.2 1051.8 1051.5 105600 /bunch

    CLIC Drive Train (2.4 GeV, 24545 nC)

    Energy Density @ shower core [J g-1] 1.34 3.08 40 187

  • Energy Density @ IB 1 mm2 [J g-1] 4293 3964 34442810


Beam losses db 2 4 gev
Beamlosses (DB 2.4 GeV)

2.4 GeV Lost before QP

1.5 TeV Lost in QP

CLIC OMPWG



Permitted fractional loss model new model drive beam
Permitted 2009 fractionalloss model (New model, Drive beam)

Based on radiation limits of magnets during 10 years x 6 monthoperation.Regularmagnet design (no rad hard)

2.4 GeV

0.24 GeV

CLIC OMPWG


Type of failures
Type of failures 2009

  • Failures causing slow onset of losses

    • Magnet system

    • Vacuum system (performance defined by tolerable operational losses)

    • Slow drifts (alignment, temperature, …)

      Next pulse permit and safe by design(2 ms)

  • Failures causing fast losses (“in-flight” failures)

    • RF breakdown (effects on the beam under study)

    • Kicker misfiring (turn around kickers !)

    • Klystron trips (not applicable for DB)

      Protection by fixed masks (Impedance?)


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