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CTF3 Planning for LS1

CTF3 Planning for LS1. Piotr Skowroński Roberto Corsini Frank Tecker. Program 2012 (Extending to the beginning 2013). Experiments with 30A drive beam

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CTF3 Planning for LS1

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  1. CTF3 Planning for LS1 Piotr Skowroński Roberto Corsini Frank Tecker IEFC

  2. Program 2012(Extending to the beginning 2013) IEFC Experiments with 30A drive beam • During this and previous runs fully recombined beam (factor 8) was available only for short times due to failures of 1.5GHz RF sources Two-Beam Test Stand (TBTS) • Structures conditioning • Two new structures installed last summer • Wake-field monitor tests • Both with and without the drive beam • RF pulse shaping tests. Test Beam Line (TBL) • From 20 A to 30 A, deceleration in the 30%-50% range • Dispersion free steering, optics studies • Also extend to high current/large deceleration

  3. Main points in 2013 and 2014 IEFC Phase Feed Forward system The dog-leg experiment: break down rates in presence of beam loading Two-beam modules Photo gun (PHIN) experiments in CTF2 hall • Requires only one klystron • Last run in 2013

  4. Phase Feed Forward System Drive beam phase feed-forward concept @ CLIC Phase feed-forward @ CTF3 Phase stability 0.2° @ 12GHz Fast kickers Phase monitor Phase stability 2.5° @ 12GHz 0.2° @ 1GHz Not just a single experiment – series of related studies: • Measure phase and energy jitter, identify sources, devise & implement cures, extrapolate to CLIC • Show principle of CLIC fast feed-forward FONT5 board (Oxford) Stripline kicker (INFN-LNF) Close link to collaborating partners: INFN-LNF: Phase monitors, strip-line kickers Oxford University/JAI: feedback electronics, amplifiers 4 IEFC

  5. Phase Feed Forward • Phase monitor tests – 2 monitors installed in summer 2012 • System installation in spring 2013 • First system tests planned in summer 2013 Phase monitor (INF-LNF, EuCARD) IEFC

  6. Experiment on the effect of Beam-Loading on Breakdown Rate Beam loading reduces field locally in the structure ⇨is it the break-down rate lower (or higher)? • CLEX probe beam has only limited current/pulse length, CLEX Drive beam has limited rep rate ⇨ use CTF3 drive beam and klystron driven X-band structure • Reactivate the old ‘30 GHz PETS’ line, 1 A DB current, can reach 50 Hz • Measure BDR with/without beam to get a direct comparison Present schedule: Install in winter shutdown 2012-2013 Run experiment in 2013 DELAY LOOP BL - BDR experiment COMBINER RING LINAC CLEX From X-band klystron 1 A, 240 ns pulse from CTF3 linac X-band components G. Riddone, A. Solodko X-band structure TD24 IEFC

  7. Two-Beam Modules 3D model of integration of the first CLIC Module in CLEX (2013) Module T0 TBTS PETS tank CLEX - Three two-beam modules (2014) Main Beam line Present schedule: First module installation: end 2013 (At least one year of testing) Module string installation end 2014 Drive Beam line IEFC

  8. Schedule 2013 (as of September) Modifications from last month IEFC

  9. Schedule 2013 (as of September) Modifications from last month IEFC

  10. Schedule 2013 IEFC Short winter shutdown: • Stop the machine on December 14th and restart operation with beam on January 21 • 7 weeks before the LHC stop • Some new equipment will be installed and most of the cabling work will be done • Install demineralizing station Running until all media and services are available Second, longer shutdown starting end of April till end of July • The longer maintenance of the RF system will be done • This shutdown may shift later depending on running conditions, advancement of other activities and readiness of new hardware. CTF3 would restart in August and run until the end of the year The dog-leg installation should be completed during May-June, and the beam-loading experiment may start as soon as klystrons 2 to 7 are available. PHIN run also possible in summer, in the shadow of modulator-klystron maintenance of the 2nd half of the CTF3 Linac.

  11. Known issuesand planned solutions IEFC Demineralized water will not be available from mid-May to mid-August • Postpone winter shutdown to May • Initial plan: installation of local demineralizing station • Filter cartridges must be periodically regenerated • Not enough man power for this • Accepting to stop for the whole period, still would like to install the system Access: no operators in CCC/CPS island • Moving the control to CSA and to the CTF control room Possible interruptions of control services • Moving some services locally (f.g. ctf3op home directories) Asking to concentrate all the potentially disrupting interventions, preferably to our summer shutdown

  12. Modifications from last month Modifications from last month IEFC

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