Linac4 FBCT’s 18/ L4 BI BCT review Lars Søby On the behalf of: M. Andersen, D. Belohrad, L. Jensen, Franco Lenardon and J. C. Allica Santamaria

BCT’s in the Linac Ø= 100 mm Ø= 146 mm 18/ * 6 for L4T, L4Z 11 BCTS in L2 L4 BI BCT review Lars Søby L4L ~ 12 mL4D ~18 mL4C ~22 mL4P ~14 m L4T ~50 m L4Z ~10 m Ø= 100 mm Ø= 26 mm Ø= 40 mm BCT Ø= 67 mm Movable test bench

BCTs in Transfer line, Ø=100mm BCT IN dump line 18/ L4 BI BCT review Lars Søby L4T.BCT.0107 L4T.BCT.0673 L4T.BCT.1043 L4T.BCT.1243 L4T.BCT.1553 L4Z.BCT BCT per 10m From Movable Test bench Ø=67mm, DN63 From Movable Test bench Ø=67mm, DN63

Inter-tank transformers BCT length 40mm 18/ Total length 146 mm L4 BI BCT review Lars Søby Total length 210 mm BCT length 105 mm CCDTL-PIMS DTL-CCDTL Ø= 40 mm

Chopper line transformer Ø= 26 mm 18/ EMC test has been done In place with quadrupoles pulsing with up to 250A. Perturbations less than 1% in window of 750us. Quadrupole L4 BI BCT review Lars Søby VITROPERM 500 F µr>

LT.BCT30 (LINAC2) Transformer Length 297mm Diameter 146mm 18/ L4 BI BCT review Lars Søby 6 BCTs in LT,LTB and measurement lines 5 in BI line

50 or 20 turns? 20 turns with 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. Pulse length=100ns2.5 more signal 18/ L4 BI BCT review Lars Søby 50 turns without positive feedback

Linac 4 – RFQ pulse Beam out of RFQ Bunch spacing = 2.84ns Bunch population : 1.14x10 9 H - Linac4 pulse length = 400  s 18/ L4 BI BCT review Lars Søby

Linac 4 – Chopped beam PSB T rev = 1  s 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 Pulse length = 400  s 18/ L4 BI BCT review Lars Søby Min 50ns 2.84ns BCT response

Acquisition system 18/ L4 BI BCT review Lars Søby RfRf m of cable VME based TRIC card Low pass filter on CH2 CH1: Fast relative current evolution CH2: Average charge with time, CH2: Total charge in 400us pulse CH1 CH2 All BCTs on OASIS

TRIC card 18/ L4 BI BCT review Lars Søby11

TRIC specifications 18/ L4 BI BCT review Lars Søby12

TRIC measurement, L4 3MeV 18/ L4 BI BCT review Lars Søby13 BeamBeam offsetCalibration Cal. offset Non chopped beam

18/ L4 BI BCT review Lars Søby14 TRIC measurement, L4 3MeV Different time scale

18/ L4 BI BCT review Lars Søby15 TRIC measurement, Lab 400us, 50ns chopped beam BCT + H.E m cable + TRIC

TRIC measurement, Lab 18/ L4 BI BCT review Lars Søby16 BCT + H.E m cable + TRIC 400us, 50ns chopped beam

Digital integration error 18/ L4 BI BCT review Lars Søby17 So to do the digital integration we need ~100 (50) samples i.e. 500ns (250ns) pulses to have an error <1% or introduce filtering with ~ 1MHz LP filter.

Digital integration error 18/ L4 BI BCT review Lars Søby18 TRIC card 200MS/s Oscilloscope 10GS/s

BCT and TRIC performance Pulse length BCT CurrentBCT ChargeTRIC Charge Short cable 900ns100 % 99.5% 800ns100 % 98.7% 700ns100 % 97.5% 600ns100 % 97.0% 500ns100 % 96% 100ns100 % - 50ns91 %100%60% Long cable (200 m ) 500ns98 %100%- 100ns86 %100%- 50ns77%100%- 18/ L4 BI BCT review Lars Søby 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.

Specifications and performance RequirementsPerformance of cable + TRIC Pulse length50us-400us50 (500)ns-400us Intensity range10-80mA10-100mA Resolution0.5mA100uA (10 bits) Accuracy1%1% after 800ns Precision<0.5%(<0.5%) Time resolution1us10ns-2us Bandwidth1Hz-6MHz Droop at 1ms0.6% ObservableFast current with time, Ch1 ObservableTotal charge, Ch2 ObservableSlow charge with time, Ch2 18/ L4 BI BCT review Lars Søby20

Total charge / Charge per ring 18/ L4 BI BCT review Lars Søby21 L4T ~50 m R1R2R3R4 t 400us Total charge for full pulse length BIi.BCT20BRi.BCT8L1 BI.BCT10 Total charge per ring BI transfer line

Watchdog hardware 18/ L4 BI BCT review Lars Søby22 Four separate low loss and high loss WD’s 2ms By user and destination, i.e we can continue sending beam to the Booster if losses in e.g. LBS

Watchdog 18/ L4 BI BCT review Lars Søby23

Watchdog hardware 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 18/ L4 BI BCT review Lars Søby Beam Permit 2ms

Watchdog 18/ L4 BI BCT review Lars Søby25 WatchdogBCTDestinationactioninputsoutputs LOW ENERGY 3MeV Test stand L4L.BCT.1183 all No beam permit if transmission in # of charges is below set threshold 3 MeV BIC, ‘RFQ watchdog ’ user input L4L.BCT.3113 Linac4 L4L.BCT.3113 all No beam permit if current is below hard-coded threshold Stop and start pre- chopper timing signals Master BIC ‘source RF’ fixed threshold GENERAL Linac4 and L4T L4L.BCT.4013 L4DUMP No beam permit for specific user if transmission in # of charges is below set threshold Destination + user information from MTG Master BIC ’L4 & LT OK' L4Z.BCT.0117 L4L.BCT.4013 LBE, LBS, PSB LT.BCT30 Master BIC ’L4 & LT OK' LT/LTB/BI, LBE/LBS L4T.BCT.1553 PSB BI.BCT20.S L4T.BCT.1553 LBE LBE.BCT65 L4T.BCT.1553 LBS LBS.BCT64 PSB INJECTION BI.BCT20.S PSB BIC ‘PSB ok (1)’ ∑ of 4 BCTs in PSB section 8L1 HIGH LOSS Linac4 and L4T L4L.BCT.4013 L4DUMP No beam permit for specific DESTINATION if transmission in # of charges is below set threshold Destination + user information from MTG Master BIC ’L4 & LT OK' L4Z.BCT.0293 L4L.BCT.4013 LBE, LBS, PSB lt.bct30 LT/LTB/BI, LBE/LBS L4T.BCT.1553 PSB Master BIC ’L4 & LT OK' BI.BCT20.S L4T.BCT.1553 LBE LBE.BCT65 L4T.BCT.1553 LBS LBS.BCT64 PSB INJECTION BI.BCT20.S PSB BIC ‘PSB ok (1)’ ∑ of 4 BCTs in PSB section 8L1

Planning Transformer Drawings completed Manufac. TestedInstalledHead amplifier TRIC cardWatchdogSpare vacuum chamber Diameter LEBT 1+1ps 1 OK 1 underway To be odered 100 mm Chopper line 2 December 2011 June mm Line 3 MeV 2 December 2011 To be ordered 67 mm DTL-CCDTL 1pc December 2011 To be ordered June mm CCDTL-PIMS 1pc May 2012 December 2011 June mm L4T+L4Z 6pc June 2012 December 2011 To be ordered 2 * 67mm 4 * 100mm 18/ L4 BI BCT review Lars Søby

Budget: Budget Spent / Left : 100kCHF ItemCost Comments 4 L4T, L4Z BCTs160kCHF Cables L2 BCT25kCHFMust go to BOR L2 +BI TRIC25kCHFNew ACQ system Extra LEBT BCT Future costs >110kCHF missing, mainly 2012!! L4 BI BCT review Lars Søby

Milestones 18/ L4 BI BCT review Lars Søby28 Linac4 installation & commissioning nov-10 jun-11 jul-12 jan-13 apr-13 feb-14 Start of Cabling campaign Start of Machine installation Test Stand move to Linac4 Start of intermediate Beam Commissioning Start of Linac4 Beam Commissioning – 160MeV Start of General Services Installation 20 months 12 months 9 months 4 months 10 months Critical Path

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 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. 18/ L4 BI BCT review Lars Søby29