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Linac4 FBCT’s

Linac4 FBCT’s. On the behalf of: M. Andersen, D. Belohrad, L. Jensen, Franco Lenardon and J. C. Allica Santamaria. BCT’s in the Linac. L4L ~ 12 m. L4D ~18 m. L4C ~22 m. L4P ~14 m. L4Z ~10 m. * 6 for L4T, L4Z. DTL. H- source. LEBT. RFQ. MEBT (chopper). CCDTL. PIMS. Dump Line.

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Linac4 FBCT’s

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  1. Linac4 FBCT’s On the behalf of: M. Andersen, D. Belohrad, L. Jensen, Franco Lenardon and J. C. Allica Santamaria L4 BCC BCT review Lars Søby

  2. BCT’s in the Linac L4L ~ 12 m L4D ~18 m L4C ~22 m L4P ~14 m L4Z ~10 m * 6 for L4T, L4Z DTL H- source LEBT RFQ MEBT (chopper) CCDTL PIMS Dump Line Transfer Line Ø= 100 mm Ø= 100 mm Ø= 26 mm L4T ~50 m Ø= 146 mm Movable test bench Ø= 40 mm Ø= 40 mm BCT Ø= 67 mm 11 BCTS in L2 L4 BCC BCT review Lars Søby

  3. BCTs in Transfer line BCT IN dump line ? ? ? 1 BCT per 10m L4 BCC BCT review Lars Søby

  4. Inter-tank transformers DTL-CCDTL CCDTL-PIMS Ø= 40 mm Ø= 40 mm BCT length 40mm BCT length 105 mm Total length 146 mm Total length 210 mm L4 BCC BCT review Lars Søby

  5. Chopper line transformer EMC test has been done In place with quadrupoles pulsing with up to 250A. Perturbations less than 1% in window of 750us. VITROPERM 500 F µr> 10 000 Ø= 26 mm Quadrupole L4 BCC BCT review Lars Søby

  6. LT.BCT30 (LINAC2) Transformer 6 BCTs in LT,LTB and measurement lines 5 in BI line Length 297mm Diameter 146mm L4 BCC BCT review Lars Søby

  7. 50 or 20 turns? 2.5 more signal Pulse length=100ns 20 turns with positive feedback 50 turns without positive feedback All BCTs as from second chopper line BCT must be equipped with 20 turns, in order to acquire short beam pulses. The second Chopper line BCT should be re-wound. L4 BCC BCT review Lars Søby

  8. Linac 4 – RFQ pulse Beam out of RFQ Linac4 pulse length = 400ms Bunch spacing = 2.84ns Bunch population : 1.14x109 H- L4 BCC BCT review Lars Søby

  9. Linac 4 – Chopped beam Pulse length = 400ms PSB Trev = 1ms • Total 352 buckets • Max 222 buckets filled (630ns) • Min 17 buckets filled (50ns) • Multiturn injection : 1 up to 100 turns per ring • Different chopping schemes Min 50ns BCT response 2.84ns L4 BCC BCT review Lars Søby

  10. Acquisition system VME based TRIC card Rf Low pass filter on CH2 100-200m of cable CH2 CH1 CH1: Fast relative charge (current?) evolution CH2: Average charge with time, CH2: Total charge in 400us pulse L4 BCC BCT review Lars Søby

  11. TRIC card L4 BCC BCT review Lars Søby

  12. TRIC specifications L4 BCC BCT review Lars Søby

  13. TRIC measurement, L4 3MeV Non chopped beam Cal. offset Beam Beam offset Calibration L4 BCC BCT review Lars Søby

  14. TRIC measurement, L4 3MeV Different time scale L4 BCC BCT review Lars Søby

  15. TRIC measurement, Lab 400us, 50ns chopped beam BCT + H.E. + 100m cable + TRIC L4 BCC BCT review Lars Søby

  16. TRIC measurement, Lab BCT + H.E. + 100m cable + TRIC 400us, 50ns chopped beam L4 BCC BCT review Lars Søby

  17. TRIC measurement, Lab Intermediate time base Not very useful L4 BCC BCT review Lars Søby

  18. BCT performance Amplitudes and integrated charges measured with oscilloscope. L4 BCC BCT review Lars Søby

  19. Digital integration So do the digital integration we need ~100 (50) samplesi.e.500ns (250ns) pulsesto have an error <1% or introduce filtering with ~ 1MHz BP filter. L4 BCC BCT review Lars Søby

  20. Total charge / Charge per ring DTL H- source LEBT RFQ MEBT (chopper) CCDTL PIMS Dump Line Transfer Line 400us L4T ~50 m R1 R2 R3 R4 LT, LTB transfer Line t Total charge for full pulse length Total charge per ring BIi.BCT20 BRi.BCT8L1 BI.BCT10 BI transfer line L4 BCC BCT review Lars Søby

  21. Specifications and performance L4 BCC BCT review Lars Søby

  22. Planning If 67mm or 100mm design Need design to be frozen for L4T to launch fabrication L4 BCC BCT review Lars Søby

  23. Budget: 64371 Extra LEBT BCT Left : 150kCHF Future costs >150kCHF missing, mainly 2012!! L4 BCC BCT review Lars Søby

  24. Milestones Linac4 installation & commissioning 2010 2011 2012 2013 2014 Start of General Services Installation nov-10 20 months Start of Cabling campaign jun-11 12 months Start of Machine installation jul-12 9 months Test Stand move to Linac4 jan-13 4 months Start of intermediate Beam Commissioning Critical Path apr-13 10 months Start of Linac4 Beam Commissioning – 160MeV feb-14 L4 BCC BCT review Lars Søby

  25. Conclusions • Everything on schedule • Over spending by ~150kCHF . • The number of BCTs in L4T should be reduced • 20 turns on all BCTs…also chopper line BCT if possible. • Fast (peak) charge measurements limited to 500ns beam pulses, due to BCT bandwidth. • Charge measurement to 1% requires ~250-500ns pulses. Filter on TRIC CH2 with total charge measurement • Viewing of pulse shape on TRIC CH1, or OASIS? • Total charge per pulse in L4 + transfer lines. Charge per ring in Booster injection region L4 BCC BCT review Lars Søby

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