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CTF3 Update R. Corsini for the CTF3 Team. 1. Conclusions. From December 2013 Project Meeting. 2 nd run of 2013 not very lucky : Problem with CALIFES cathode plug-in TWTs availability (from 2 ½ to 2, to 1…) – hope to be solved

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Ctf3 update r corsini for the ctf3 team

CTF3 UpdateR. Corsini for the CTF3 Team

1


Conclusions

From December 2013

Project Meeting

  • 2nd run of 2013 not very lucky:

    • Problem with CALIFES cathode plug-in

    • TWTs availability (from 2 ½ to 2, to 1…) – hope to be solved

    • Delays in hardware components (in dogleg and feed-forward exp.)

    • Some issues on klystron availability, operation manpower, infrastructure)

  • However, good progresses in stability, repeatability, operational software, optics & procedures (not covered here)…

  • Future schedule agreed upon, hardware problems on the way to be solved - will restart fast after the short Christmas break, all ready for an exciting 2014!


Status of last year issues

  • CALIFES: Fast successful repair, during winter short shut-down

  • TWTs: 1 New one, from new supplier, 2 repaired. Now we have 3 fully operational + one spare. Ordering a second one from Poland. All 3 are working stably since January.

  • Dogleg experiment: all hardware installed – start scheduled in summer

  • Feed-forward experiment: amplifiers expected for Easter, all other hardware ready (will also receive two new phase monitors during 2014 – can start with present one only, and monitor phase in PETSs)

  • Klystron availability: very good progress

  • Operation manpower – still a bottleneck, but…

  • An exciting 2014 has started!


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 transport to TBTS, > 20 A





Stability – Feedbacks

  • Gun current feedback (plus flattening on request)

  • RF compression system temperature (local + global)

  • Local RF phase feedback on each klystron

  • Injector feedback (MKS 2 and 3)

  • RF amplitude flattening feedback

  • Beam loading feed-back (MKS 5 to 15)

  • TWTsfeeback (extension of injector feedback)

  • Energy feedback + energy flattening feedback (MKS15)

  • Flattening of BPR 475…

A. Andersson, A. Dubrowski, T. Persson, P. Skowronski, L. Malina, D. Gamba…


Trips MKS02 & MKS 15

D. Gamba

Stop energy flattening and BPR 475

BPR 475 flattening feedback

Disable MKS15 loading fb and inj. fb

energy flattening feedback (MKS15)


Emittance & optics – TL2

  • Still large Horemittance

  • Vertemittance small

  • Suspect error in MTV 253 scan (calibration?)

  • Stable Twiss parameters & optics in TL2

P. Skowronski, T. Persson


CTF3 as diagnostics test bed

Electro-optic bunch profile monitor

in CALIFES

(CERN-Dundee University)

Stripline Drive Beam BPM in TBL

(CERN-LAPP)

R. Pan, T. Lefebre

2013 Goals

Cavity Main Beam BPM

in CALIFES/TBTS

(CERN-JAI at Royal Holloway)

F. Cullinan, J. Towner,

W. Farabolini, M. Wendt…


CALIFES

Diamond beam loss detectors

F. Burkart, O. Stein, W. Farabolini


CALIFES - bunch length compression

  • CALIFES bunch length measured with streak camera, between 3 and 6 psrms

W. Farabolini, T. Lefebe, S. Mazzoni


TBTS

  • 22-23 A through PETS (factor 8)

  • Up to 60 MW produced – halfway with On-Off mechanism

  • Yesterday: about 50 MW in structure, no breakdowns

  • Ongoing studies on DB deceleration, coupling etc…

W. Farabolini, J.L. Navarro,

N. Vitoratou, V. Ziemann, J. Oegren


TBTS – multipolar components

W. Farabolini

Positive crest

Zero crossing,

Negative slope

Unfocused beam

through structure,

No RF

Zero crossing,

Positive slope

Negative crest


CTF3 Schedule 2014

beam in linac

first beam from gun

beam in CALIFES

16 A in CR – factor 4

25 A in CR

factor 8

7 A in DL factor 2

23 A in CLEX

factor 8

Today


CTF3 Schedule 2014

Installation TBM / Maintenance klystrons


TBM Installation

D. Gudkov, G. Riddone, H. Mainaud …


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