L4 BCC 1 Sep 2011 F Roncarolo U Raich LSoby JTan CZamantzas F Lenardon CVuitton G JFocker General Remarks Overview DESIGN Completed for almost all instruments ID: 556534
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Slide1
LINAC 4 TL diagnostics
L4 BCC – 1 Sep 2011
F. Roncarolo, U.
Raich
L.Soby
,
J.Tan
,
C.Zamantzas
, F.
Lenardon
,
C.Vuitton
, G-
J.FockerSlide2
General Remarks / Overview
DESIGNCompleted for almost all instruments (
m
ost of TL devices == L4 monitors)
Basically all devices will be tested at 3 MeV test stand Open issuesNumber of devices and locations: need frozen layoutOnce done: details about interconnectionsProfile monitor in dump line (see later slide)BLM detector type (see later slide)Equipment of TL with station for laser stripping R&DSCHEDULE / BUDGETPresent advancement/plans/budget for design, fabrication, cabling and installation under controlBI Linac 4 review (with reviewers panel) on October 18th (tbc and announced in the next few days)
F. Roncarolo, U. Raich
L4 BCC - 01 Sep 2011
2Slide3
Diagnostics Park
L4 BCC - 01 Sep 2011
3
F. Roncarolo, U. Raich
MONITOR TYPE
Quantity
L4T LINE
BCT
7
BLM
6
SEM GRIDS
3 (H+V)
BPM
12
BSM
1L4Z LINEWS or SEM GRID1 (H+V)BCT1
3 BTVs now replaced by 1 WS or SEM GRID (H+V)
From Layout DB 31-08-11Slide4
Beam Current Transformers BCT
L4 BCC - 01 Sep 2011
4
F. Roncarolo, U. Raich
Copy of LEBT monitors100 mm diameterUp to 200 MHz sampling rateAcquisition sync. with the distributor, to know how much beam current goes to each PSB ringElectronics ready for such optionNeed FPGA code update (likely not possible before LS1)In generalDo we agree on the number of devices?Foreseen by BI : 6, Layout DB: 7Slide5
Beam Position Monitors (BPM)
Shorted strip-line detectorsSame design for all L4 BPMsDiameter for TL monitors: 100 mm, L = ~250mm
Electronics with down-mixing of 22 MHz
maximum sampling rate 4x22=88 MHz
50 ns pulse length beam position measurement foreseen by the design (noise levels to be investigated)For TL: is # of monitors and location frozen ?At the moment of installing TL BPMs: will it be possible to change the 17 old TL monitors (after BHZ20)? F. Roncarolo, U. RaichL4 BCC - 01 Sep 20115
J. TanSlide6
Profile Monitors (SEM Grids)
Same design as all L4 monitors – will require reduced pulse length (100us)
Mechanics
~ on schedule, 140 mm flange-to-
flange (PIMs type)New electronics under development, to be tested on 3 MeV test stand200 kHz ADC band (5 us)Wire polarizationNew connectors and cables: 32 channels in 1 cableF. Roncarolo, U. RaichL4 BCC - 01 Sep 20116Is this up to date? Once frozen: verify details of flange connectionsSlide7
Dump Line profile monitor
3 screens option abandoned
Additional
monitor not
included in BI plansWhat are requirements?SEM Grid or WS ? Spare L4 SEM gridsingle shot meas24 wires fixed pitchSpare L4 WSmultishot meas40 um resolution (wire diam.)SEM grid on stepping motor
Not foreseen by BI (can recuperate test bench device?)
Not single shot but can improve resolution with less shots than WS
new
SEM with variable resolution
(by variable rotation
w.r.t
. beam axis
)not foreseen design new or try to recuperate L2 type deviceWhen rotation != 90 deg: during single shot the sampling is done at different longitudinal locations
F. Roncarolo, U. Raich
L4 BCC - 01 Sep 2011
7Slide8
Beam Loss Monitors (BLM)
F. Roncarolo, U. Raich
L4 BCC - 01 Sep 2011
8
W.Vigano, C. ZamantzasAuto-gain switchingAuto-gain switching-Integrated detector signal sampled every 2 us-From pA
to mA detector output current
2 us : sampling the integral
Electronics under development, in parallel to L4
linac
and PSB new electronics
Special
screened cables to
minimize EM noise
(problem in other world-wide
linacs
)
TL cable installation on stand-by while waiting for latest beam optics and BLM location sEvery second BLM location is equipped with a spare cable to host an additional monitor if needed Choice of detector (Ionization chamber, chamber type, or possibly other detectors) under discussionWide dynamic range expected !Slide9
Laser Stripping R&D
Aim at profile + emittance measurement
For testing @
Linac
4At least 1 stationY chamber @ dipoleEstablish laser location and optical line pathIf there will be no intermediate dump between 1st bend and BI line: can test only laser stripping and profile meas (no emitt. meas) with a station after PIMSF. Roncarolo, U. RaichL4 BCC - 01 Sep 2011
9
LASER stripping
LASER stripping
H0 monitor
H0 monitor
H0 monitor
Possible
locationsSlide10
SOFTWARE
BCT – BPMLow level completed or well on the way to completionNeed OP GUI development
All will be tested at 3 MeV test stand
SEM grids
Low level and OP GUI done, being used at test standBLMDefinition of the memory map CPU in readout simulation mode Start development of driver, RT software, etc.First version of memory map (LINAC4) - end of SeptemberF. Roncarolo, U. RaichL4 BCC - 01 Sep 201110Slide11
SPARE
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L4 BCC - 01 Sep 2011
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F. Roncarolo, U. Raich
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F. Roncarolo, U. Raich
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