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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 BI 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 BI BCT review Lars Søby

  3. BCTs in Transfer line, Ø=100mm BCT IN dump line From Movable Test bench Ø=67mm, DN63 From Movable Test bench Ø=67mm, DN63 1 BCT per 10m L4 BI 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 BI 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 BI 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 BI 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 as well as the two from the movable test bench. L4 BI 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 BI 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 BI 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 current evolution CH2: Average charge with time, CH2: Total charge in 400us pulse All BCTs on OASIS L4 BI BCT review Lars Søby

  11. TRIC card L4 BI BCT review Lars Søby

  12. TRIC specifications L4 BI BCT review Lars Søby

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

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

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

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

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

  18. Digital integration error TRIC card 200MS/s Oscilloscope 10GS/s L4 BI BCT review Lars Søby

  19. BCT and TRIC performance So the error on the integrated charge depends on the TRIC card number of samples Only, while the current measurement is limited by the BCT bandwidth. L4 BI BCT review Lars Søby

  20. Specifications and performance L4 BI BCT review Lars Søby

  21. 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 BI BCT review Lars Søby

  22. Watchdog hardware Four separate low loss and high loss WD’s By user and destination, i.e we can continue sending beam to the Booster if losses in e.g. LBS 2ms L4 BI BCT review Lars Søby

  23. Watchdog L4 BI BCT review Lars Søby

  24. Watchdog hardware Beam Permit 2ms • The WD uses TRIC cards to measure the intensity • Both cards are connected by DVI connectors. • Input Signals: • Intensity from TRIC • Screens in/out: Indicates allowed loses. • Bending magnet status: indicate if beam is expected • Triggers: No trigger no beam • Remote Reset: Reset the WD when has been triggered L4 BI BCT review Lars Søby

  25. Watchdog L4 BI BCT review Lars Søby

  26. Planning L4 BI BCT review Lars Søby

  27. Budget: 64371 Extra LEBT BCT Left : 100kCHF Future costs >110kCHF missing, mainly 2012!! L4 BI BCT review Lars Søby

  28. 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 BI BCT review Lars Søby

  29. Conclusions • Everything on schedule • Over spending by ~110kCHF , one extra LEBT BCT. • A total of 22 BCTS……. • 20 turns on all BCTs…also chopper line BCT and movable test bench. Foreseen when moved to L4. • Fast current measurements limited to 500ns beam pulses, due to BCT bandwidth. • Charge measurement to 1% requires 50-100 samples ~800ns pulses. Improve firmware and/or introduce filter on TRIC CH2 with total charge measurement. • Viewing of pulse shape on TRIC CH1, and OASIS. • Total charge per pulse in L4 + transfer lines. Charge per ring in Booster injection region. L4 BI BCT review Lars Søby

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