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CTF3 Update R. Corsini for the CTF3 Team. 1. Run 1 – fast update. Consolidated factor 8 combination Routinely operating with factor 8 this year, 28 A Huge progress in reliability (3 TWTs , klystrons) – stability – r epeatibility

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Ctf3 update r corsini for the ctf3 team

CTF3 UpdateR. Corsini for the CTF3 Team

1


Run 1 – fast update

  • Consolidated factor 8 combination

    • Routinely operating with factor 8 this year, 28 A

    • Huge progress in reliability (3 TWTs, klystrons) – stability – repeatibility

    • Still working on dispersion control, emittance, transport to CLEX

  • TBTS

    • Nominal field level, large reserve in power

    • Wake-field monitor tests ongoing (renewed system)

    • Studies on multipolar RF fields, BD kicks, beam coupling studies, flash-box (Uppsala)

  • TBL

    • Not a lot of beam-time (vacuum leaks), some problem with high-current transport

  • CALIFES experiments:

    • Electro-Optical bunch length monitor, excellent first results!

    • BLM studies (diamond detector) started, continuation of BPMs…

  • Phase feed forward

    • Preparatory studies very successful (TL2 optics, bump closure, phase measurements…)


Outlook

  • Still one week of operation

  • Window for Two-Beam Module installation: 23rdJune - 22ndSeptember(tight but…)

  • MDKs maintenance and other repairs/upgrades in the shadow of the module

  • PHIN run from 28thJuly

  • Beam-loading dog-leg experiment

    • RF conditioning from beginning of 7th July

    • Beam testing from mid August

  • DB preparation from 1st September (up to tail-clipper dump)

  • Phase feed forward

    • Amplifiers at CERN next week… high priority at restart

  • TBL

    • New PETS tank installed

    • High priority, work on high current transport

  • TBTS ongoing activities to be continued and extended with the TBM –

  • CALIFES experiments also to be continued



Beam quality:

Horizontal emittance:

CR combination 8, end of TBL line in CLEX ~ 400 um

Vertical emittance:CR combination 8, end of TBL line in CLEX ~ 140 um (target 150 um)

Stability:

Routinely < 5 10-4 from linac

About 5 10-3 CR combination 8

Losses: < 10% CR combination factor 8

Repeatibility:

Blue line: CR combination on 29 April, evening

Red line: CR combination at start-up (no adjustments done) on 30 April


Linac

Delay Loop

1st turn

Combiner Ring

Status – 28 A in CR (factor 8)

4th turn



Status – transport to CLEX,

~ 28 A before the wall (factor 8)


Run 1 – summary until now

30 Jan first beam from gun

17 Feb first beam in spectrometer 10 (3 GHz)

18 Feb first 3 GHz beam in CR, first 1.5 GHz beam in linac

19 Feb first CALIFES beam

21 Feb first 1.5 GHz beam to CR

24 Feb first combination 4 beam (1.5 GHz with phase switches)

26 Feb 14 A (factor 4) extracted from CR

27 Feb first beam in CLEX (uncombined)

4 Mar first beam (3 GHz) to – and through – DL

5 Mar full combination factor 2 in DL (7 A)

13 Mar beam (uncombined) end of TBL / 3 GHz factor 4 optimized, 16 A

19 Mar first drive beam to TBTS for Uppsala beam tests (factors 1 to 4)

21 Mar first factor 8 recombination ~ 20 A

25 Mar good factor 8, ~ 25 A ~1% stability

9 Apr drive beam transport to TBTS, > 20 A

10 Apr two-beam acceleration, ~ nominal CLIC gradient 100 MV/m

14 Apr New TL2 optics for phase feed-forward commissioned, phase slow correction tested

16 Apr drive beam transport to CLEX > 23 A (TBL > 20 A)


CTF3 Schedule 2014

Installation TBM / Maintenance klystrons


TBM Installation

D. Gudkov, G. Riddone, H. Mainaud …


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