Accelerator Instrumentation< kazuro.furukawa @ kek.jp >Measurement and Data Acquisition
for Accelerator Controls at KEK(Beam Position Monitor at Linac)
Kazuro Furukawa< kazuro . furukawa @ kek . jp >For Linac and KEKB Control Groups
Oct.2009.

EPICS Meeting, NSRRC, Taiwan

Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

KEK :Accelerator Facilities forParticle & Nuclear Physics,
Material Structure Science

Mt. Tsukuba

J-PARC(at Tokai Site)

KEKB
PF-AR

ATF

STF
cERLPF
Linac

EPICS Meeting, NSRRC, Taiwan

Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

Accelerator Improvement and Nobel Prize
Belle/KEKFeb.2005
ContinuousInjections

May.2000

Apr.2003
Dual Bunch e+Dec.2008
Crab Cavities andQuasi-simultaneous Injection
EPICS Meeting, NSRRC, Taiwan

Flexible Upgrades for
Accelerator Operation
Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

Simultaneous Injection Requirements
uLinac clients
vKEKB
8-GeV e– 1nC x2
3.5-GeV e+ 1nC x2(with 10nC primary e–)vPF 2.5-GeV e– 0.1nCv(PF-AR 3-GeV e– 0.2nC)

uAt first, simultaneous
top-up injections to three rings at KEKB and PF
vSwitching beams at 50Hz
vFor stable operation and higher quality exp. results
EPICS Meeting, NSRRC, Taiwan

Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

Beam Instrumentations at Linac
uDiagnosis for High-stability (for high luminosity at KEKB ring)v Wider dynamic range (0.1nC ~ 12nC)
v Reasonable resolution

uTransverse wake-fileld suppressionv Beam position torrelance (0.1mm ~ 0.3mm) against center of quads,otherwise leads to emittance growthuBeam monitors
v Beam position monitor (Stripline): ~100v Streak camera: 2v Wire scanner: 14v Compact Screen monitor: ~100v Wall-current monitor: (~50)

EPICS Meeting, NSRRC, Taiwan

Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

BPM, one of most important
Beam Instrumentationu~100 monitors (~100 more at beam transport line)uResolution down to ~100µm

uSimultaneous orbit acquisition along the 600m linac
uSimultaneous dual-bunch measurement in a pulse (96nsapart)uDynamic range of 0.1nC~12.5nC
uRepetition of 50Hz
uLimited electrode length, fast signal of 10ps - 1nsuLimited budget
uLimited construction/maintenance man-power
EPICS Meeting, NSRRC, Taiwan

Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

BPM Design
uStrip-line, 50ohm,
attached to a quad

EPICS Meeting, NSRRC, Taiwan

Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

Measurement and Data Acquisition
uOriginally much efforts to develop
detectors, shaping amplifiersvNo budget for all BPMs

uSwitched to direct waveform
acquisitionvMinimized active components, thenminimized calibration tasks, maintenancevEqual-length cables
vOne oscilloscope covers about 5 BPMs,
or combined 20 (or 40) waveforms
v5 - 10Gs/s (with additional interpolation)
vPossible to measure dual bunches
vSolved many issues at once!
vExtract each signal, apply calibration
factors, send to upper layer at 50Hz
EPICS Meeting, NSRRC, Taiwan

Kazuro Furukawa, KEK, Oct.2009.

8Accelerator Instrumentation

Database and Calibration Factors
uPulse timing value for each electrode, each monitor, each of four beam
modes
uDynamic range (voltage) for each beam modeuMapping information up to 3rd order polynomial
uCable loss for each electrode, combiner loss, charge conversions for
single/multi-bunch beams
uAbout 40 coefficients for each BPM
uProcessed on one of 24 DPO7104s
in the framework of EPICS softwarethen served directly to clients at 50Hz
100 BPMs

24 x DPO7104

Clients

uOld system served at 1Hz
100 BPMs

19 x TDS680B

EPICS Meeting, NSRRC, Taiwan

19 VMEs~5 Unix

Clients
Kazuro Furukawa, KEK, Oct.2009.

9Accelerator Instrumentation

Evaluation
uLinear position relation between 3 BPMs on changing correctors –>deviation ~0.1mmuAlignment against accompanying quad, changing corrector/quad –
offset measurement – every BPM

uBeam based recalibration of BPMs with many measurements (use offourth information other than x, y, charge)
uCharge calibration was carried with Faraday cup (energy at ~250MeV)EPICS Meeting, NSRRC, Taiwan

Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

Orbit Stabilization
uSimple orbit feedbackvMonitor³Type 1: Two BPM (~90 degree phase apart)³Type 2: Weighed average of BPMs over a betatron wave lengthvActuator: Two steerings

EPICS Meeting, NSRRC, Taiwan

Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

Orbit Fluctuations and Stabilizations
uAt the beginning of the commissioning, both stabilized well
Daily change, peak at
6 Oʼclock, caused by SB_C

EPICS Meeting, NSRRC, Taiwan

40-minute changes in A sector
Later attributed to SHB

Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

Dual-bunch Energy Equalize, and FeedbackuEnergy equalization is important for stable operation
Measurement at Bunching section
after equalization

Stabilization at R0 ArcFirst Bunch

Second Bunch

EPICS Meeting, NSRRC, Taiwan

Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

Achromatic and Isochronous Arc
uOptics correction by quadrupoles andsextupoles using BPM and streak camera

R16

First &SecondOrders
Solid lines:
after correction

EPICS Meeting, NSRRC, Taiwan

R56
blue: aftercorrection

Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

Beam Mode Pattern Generators
uThere are several versions
vBecause we were commissioning new pulsed hardware equipment, the beam
optics schemes, event system itself, etc, since autumn 2008
vOne of them is mostly used, remote or human controllable, automatic- prioritizedarbitrated, etc
Remote controlled automatic pattern arbitrator

Manual pattern generator

vTypical operation in Apr.2009.
³~25Hz for KEKB LER³~12.5Hz for KEKB HER³~0.5Hz for PF
EPICS Meeting, NSRRC, Taiwan

Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

BPM DAQ
uTektronix DPO7104 can acquire data at >50Hz.
vWith embedded EPICS

uBeam modes are recognized by events through CA network.
uClients can monitor data of an interested beam mode.
u26 oscilloscopes are installed.
u100 BPMs are synchronized. (100 BPMs at BT as well soon)

EPICS Meeting, NSRRC, Taiwan

Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

Other EPICS Development Activities at KEK
uBy A. Akiyama, et alvEmbedded IOC on FPGA-based controller

uBy M. Satoh, et alvEmbedded IOC on oscilloscopes

uBy A. Kazakov, et alvRedundant IOC (RIOC with OSI supports)
vRedundant caGateway
vATCA IOC with HPI/SAF support for RIOC
³ATCA for STF/ILC-LLRF and µTCA for cERL-LLRF

vAutomatic test system environment

uBy K. Zagar, et alvWireshark protocol analyzer for CA

uBy K. Furukawa, et alvEvent-based fast control system
EPICS Meeting, NSRRC, Taiwan

Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

SummaryuDPO7104 (firmware v1.03 2years ago) can
acquire enough data at ~200Hz
uAll of the BPM requirements (for now) aresatisfied, with high availability (because of lessactive components)
vWaveform data acquisition has much more
possibility in particle accelerator applications

uFor the future, faster and more precise
processing is necessary
vERL at 1.3GHz-continuous and ILC at 10MHz-10Hz,
with precision of <1micro-m
EPICS Meeting, NSRRC, Taiwan

Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

Summary 2
uOscilloscope
vNot a simple measurement instrument
vBut a data acquisition station³With embedded application software
wEPICS framework in our casevAnd a data processing system³With direct networking capability
wPreferable with Linux, but acceptable with Windows

EPICS Meeting, NSRRC, Taiwan

Kazuro Furukawa, KEK, Oct.2009.

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Accelerator Instrumentation

Thank you

EPICS Meeting, NSRRC, Taiwan

Kazuro Furukawa, KEK, Oct.2009.

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