Instrumentation for Machine Protection at FERMI@Elettra · FERMI@Elettra DIPAC 2011, 2011-05-17...
Transcript of Instrumentation for Machine Protection at FERMI@Elettra · FERMI@Elettra DIPAC 2011, 2011-05-17...
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L. Fröhlich, A. I. Bogani, K. Casarin, G. Cautero, G. Gaio, D. Giuressi, A. Gubertini, R. H. Menk, E. Quai, G. Scalamera,
A. Vascotto (Sincrotrone Trieste, Basovizza, Italy) L. Catani (INFN, Rome, Italy), D. Di Giovenale
Instrumentation for Machine Protection at FERMI@Elettra
DIPAC 2011, 2011-05-17 Lars Fröhlich, Sincrotrone Trieste
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FERMI@Elettra
DIPAC 2011, 2011-05-17 Lars Fröhlich, Sincrotrone Trieste
Energy Bunch Charge
Repetition Rate
Beam Power
Typical 1.2 GeV 350 pC 10 Hz 4.2 W
Design 1.5 GeV 1 nC 50 Hz 75 W
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Ionization Chambers
DIPAC 2011, 2011-05-17 Lars Fröhlich, Sincrotrone Trieste
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● 1 ionization chamber per undulator segment (19 total)
● Simple milled aluminum enclosure
● Electrodes: printed circuit boards
● Use in air (Fermi) or with gas flux
● Volume: 1.3 l
● Sensitivity (air): ~46 µC/Gy
Ionization Chambers
DIPAC 2011, 2011-05-17 Lars Fröhlich, Sincrotrone Trieste
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Ionization Chamber Frontend
DIPAC 2011, 2011-05-17 Lars Fröhlich, Sincrotrone Trieste
● Integrated readout and HV generation 0…1000 V
● Microprocessor controlled
● Ethernet interface
● Charge-integrating amplifier and 20-bit ADC
● Full charge range: 0…50 pC — 0…1.8 nC
● Integration time: 1 ms – 1 s
● 2 programmable alarm outputs
● Noise floor (with Fermi chamber): <0.4 µGy/h (rms)
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Online Solid-State Dosimetry
DIPAC 2011, 2011-05-17 Lars Fröhlich, Sincrotrone Trieste
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● MOSFETs with 300 nm insulator layer
● Readout: Track voltage for constant current (490 µA) between source and drain
RADFET Dosimeters
DIPAC 2011, 2011-05-17 Lars Fröhlich, Sincrotrone Trieste
insulator (SiO2)
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DIPAC 2011, 2011-05-17 Lars Fröhlich, Sincrotrone Trieste
● Microprocessor controlled
● Ethernet connection
● 4 RADFET channels (up to 25 V)
● Programmable interlock output
● Readout period down to 10 s
● Uses standard USB cables
RADFET Reader
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Dose History Undulator 1
DIPAC 2011, 2011-05-17 Lars Fröhlich, Sincrotrone Trieste
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Cherenkov Fiber Beam Loss Position Monitor
DIPAC 2011, 2011-05-17 Lars Fröhlich, Sincrotrone Trieste
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Beam Loss Position Monitor
● 100 m long fibers
● 250 MS/s ADC longitudinal resolution ~50 cm
DIPAC 2011, 2011-05-17 Lars Fröhlich, Sincrotrone Trieste
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Undulator Cross Section
DIPAC 2011, 2011-05-17 Lars Fröhlich, Sincrotrone Trieste
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Beam Loss Position Monitor
● Modular frontend electronics
● Multi-pixel photon counters (MPPCs): 400 avalanche photodiodes in parallel at 70 V reverse bias
● Temperature-compensated gain
● Configurable alarm thresholds
DIPAC 2011, 2011-05-17 Lars Fröhlich, Sincrotrone Trieste
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Signal Processing
DIPAC 2011, 2011-05-17 Lars Fröhlich, Sincrotrone Trieste
deconvolution
MPPC output signal
number of photodiode breakdowns
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Thanks for your interest.
Many thanks to: • Mario Ferianis, Fabio Giacuzzo, Alessandro Carniel,
and the instrumentation and controls groups of Sincrotrone Trieste
• Arne Miller (Risø High Dose Reference Laboratory, DK) • Andrew Holmes-Siedle (REM Oxford Ltd., UK)