GRETINA Gamma-ray Tracker Status and EPICS Usage

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GRETINA Gamma-ray TrackerStatus and EPICS Usage

• Carl Lionberger
• Lawrence Berkeley National Laboratory

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GRETINA Intro

• Diminutive form of GRETA (Gamma Ray Energy
  Tracking Array) ¼ GRETA
• Developed by same group as Gammasphere
• Ge crystals segmented and much closer together
  than in GS no BGO separators
• 36 segments/crystal
• 28 crystals in 7 cryostats
• http//grfs1.lbl.gov/

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Schedule (Fiscal Years)
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Data Acquisition system
Local Trigger Module
Signal Digitizers
Readout Computer
2.2 MB/s
66 MB/s
Processing Farm
Global Trigger Module
Network Switch
70 dual Processors
30 Crystals
6.9 MB/s
Aux. Det. Trigger
Workstations, Servers
Data Storage
Aux. Det. Data
2.3 MB/s Aux. Data
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Status

• Testing detectors
• Have custom digitizer (VME)
• Developing EPICS support
• Developing software requirements and algorithms
• Cd2a/3a

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EPICS Status

• Drivers
• GRETINA Digitizer
• CAEN V977 Digital I/O
• CAEN V830 Scaler
• One test IOC

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EPICS Tools

• Edm
• Vdct
• CaPython
• Sequencer
• Channel Archiver
• SCA

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Projected PV count

• Global 100
• expect several times increase
• Per crate 625 28 crates 17,500
• Might double