linac4 fbct’s 18/10-20111l4 bi bct review lars søby on the behalf of: m. andersen, d. belohrad,...
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Linac4 FBCT’s
18/10-2011 1L4 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
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* 6 for L4T, L4Z
11 BCTS in L2
L4 BI BCT review Lars Søby
Transfer Line
H- sourc
eLEBT RFQ
MEBT (chopper
)DTL CCDTL PIMS
Dump Line
L4L ~ 12 m L4D ~18 m L4C ~22 m L4P ~14 m
L4T ~50 m
L4Z ~10 m
Ø= 100 mm Ø= 26 mm
Ø= 40 mm Ø= 40 mm
BCT Ø= 67 mm
Movable test bench
BCTs in Transfer line, Ø=100mm
BCT IN dump line
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L4T.BCT.0107
L4T.BCT.0673
L4T.BCT.1043
L4T.BCT.1243
L4T.BCT.1553
L4Z.BCT.0293
1 BCT per 10m
From MovableTest bench Ø=67mm, DN63
From MovableTest bench Ø=67mm, DN63
Inter-tank transformers
BCT length 40mm
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Total length 146 mm
L4 BI BCT review Lars Søby
Total length 210 mm
BCT length 105 mm
CCDTL-PIMSDTL-CCDTL
Ø= 40 mm
Ø= 40 mm
Chopper line transformer
Ø= 26 mm
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EMC test has been doneIn 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> 10 000
LT.BCT30 (LINAC2) Transformer
Length 297mm
Diameter 146mm
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6 BCTs in LT,LTB and measurement lines5 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
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50 turns without positive feedback
Linac 4 – RFQ pulse
Beam outof RFQ
Bunch spacing = 2.84ns
Bunch population : 1.14x109 H-
Linac4 pulse length = 400ms
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Linac 4 – Chopped beam
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
Pulse length = 400ms
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Min 50ns
2.84ns
BCT response
Acquisition system
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Rf
100-200m of cable
VME based TRIC card
Low pass filter on CH2
CH1: Fast relative current evolutionCH2: Average charge with time,CH2: Total charge in 400us pulse
CH1
CH2
All BCTs on OASIS
TRIC specifications
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TRIC measurement, L4 3MeV
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Beam Beam offset Calibration Cal.offset
Non chopped beam
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TRIC measurement, L4 3MeV
Different time scale
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TRIC measurement, Lab
400us, 50ns chopped beam
BCT + H.E. + 100m cable + TRIC
TRIC measurement, Lab
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BCT + H.E. + 100m cable + TRIC
400us, 50ns chopped beam
Digital integration error
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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
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TRIC card 200MS/s
Oscilloscope 10GS/s
BCT and TRIC performance
Pulse length BCT Current BCT Charge TRIC Charge
Short cable
900ns 100 % 100 % 99.5%
800ns 100 % 100 % 98.7%
700ns 100 % 100 % 97.5%
600ns 100 % 100 % 97.0%
500ns 100 % 100 % 96%
100ns 100 % 100 % -
50ns 91 % 100% 60%
Long cable (200 m)
500ns 98 % 100% -
100ns 86 % 100% -
50ns 77% 100% -
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So the error on the integrated charge depends on the TRIC card number of samplesOnly, while the current measurement is limited by the BCT bandwidth.
Specifications and performanceRequirements Performance of cable + TRIC
Pulse length 50us-400us 50 (500)ns-400us
Intensity range 10-80mA 10-100mA
Resolution 0.5mA 100uA (10 bits)
Accuracy 1% 1% after 800ns
Precision <0.5% (<0.5%)
Time resolution 1us 10ns-2us
Bandwidth 1Hz-6MHz 1Hz-6MHz
Droop at 1ms 0.6%
Observable Fast current with time, Ch1
Observable Total charge, Ch2
Observable Slow charge with time, Ch2
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Total charge / Charge per ring
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Transfer Line
H- sourc
eLEBT RFQ
MEBT (choppe
r)DTL CCDTL PIMS
Dump Line
L4T ~50 m LT, LTB transfer Line
R1 R2 R3 R4t
400us
Total charge for full pulse length
BIi.BCT20 BRi.BCT8L1
BI.BCT10
Total charge per ring
BI transfer line
Watchdog hardware
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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 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
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BeamPermit2ms
Watchdog
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Watchdog BCT Destination action inputs outputs
LOW ENERGY3MeV 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
Linac4L4L.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.0117L4L.BCT.4013
LBE, LBS, PSB LT.BCT30
Master BIC ’L4 &
LT OK'LT/LTB/BI,
LBE/LBS
L4T.BCT.1553 PSBBI.BCT20.SL4T.BCT.1553 LBE LBE.BCT65L4T.BCT.1553
LBSLBS.BCT64
PSB INJECTIONBI.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.0293L4L.BCT.4013
LBE, LBS, PSB lt.bct30
LT/LTB/BI, LBE/LBS
L4T.BCT.1553 PSB Master
BIC ’L4 & LT OK'
BI.BCT20.SL4T.BCT.1553 LBE LBE.BCT65L4T.BCT.1553
LBSLBS.BCT64
PSB INJECTIONBI.BCT20.S
PSB BIC ‘PSB ok (1)’∑ of 4 BCTs in PSB
section 8L1
Planning
Transformer Drawings completed
Manufac. Tested Installed Head amplifier
TRIC card Watchdog Sparevacuum chamber
Diameter
LEBT1+1ps
1 OK1
underway
To be odered
100 mm
Chopper line2
December 2011
June2012
26 mm
Line 3 MeV2
December 2011
To be ordered
67 mm
DTL-CCDTL1pc
December 2011
December 2011
To be ordered
June2012
40 mm
CCDTL-PIMS1pc
May2012
December 2011
June2012
40 mm
L4T+L4Z6pc
June2012
December 2011
To be ordered
2 * 67mm4 * 100mm
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Budget: 64371
2008 2009 2010 2011 2012 2013 2014
Budget 34715 93701 71403 79678 64671 42137 3694
Spent 1470 65000 52000 115000
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Left : 100kCHF
Item Cost Comments
4 L4T, L4Z BCTs 160kCHF
Cables L2 BCT 25kCHF Must go to BOR
L2 +BI TRIC 25kCHF New ACQ system
Extra LEBT BCT
Future costs
>110kCHF missing, mainly 2012!!
L4 BI BCT review Lars Søby
2011 2012 2013 20142010
Milestones
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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 Installation20 months
12 months
9 months
4 months
10 monthsCritical 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 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.
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