1. GRETINA Gamma-ray Tracker Status and EPICS Usage
Carl Lionberger
Lawrence Berkeley National Laboratory
GRETINA
EPICS Meeting 2005

2. 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
GRETINA
EPICS Meeting 2005

3. Schedule (Fiscal Years)
GRETINA
EPICS Meeting 2005

4. Data Acquisition system
Local
Trigger
Module
Signal
Digitizers
Readout
Computer
2.2 MB/s
66 MB/s
Global
Trigger
Module
Processing Farm
Network
Switch
70 dual Processors
30 Crystals
6.9 MB/s
Aux. Det. Trigger
Workstations, Servers
Aux. Det. Data
Data Storage
2.3 MB/s + Aux. Data
GRETINA
EPICS Meeting 2005

5. GRETINA
EPICS Meeting 2005

6. Status Testing detectors Have custom digitizer (VME)
Developing EPICS support
Developing software requirements and algorithms
Cd2a/3a
GRETINA
EPICS Meeting 2005

7. GRETINA
EPICS Meeting 2005

8. GRETINA
EPICS Meeting 2005

9. GRETINA
EPICS Meeting 2005

10. GRETINA
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11. GRETINA
EPICS Meeting 2005

12. EPICS Status Drivers One test IOC GRETINA Digitizer
CAEN V977 Digital I/O
CAEN V830 Scaler
One test IOC
GRETINA
EPICS Meeting 2005

13. EPICS Tools Edm Vdct CaPython Sequencer Channel Archiver SCA GRETINA
EPICS Meeting 2005

14. Projected PV count Global 100– Per crate 625 * 28 crates = 17,500
expect several times increase
Per crate 625 * 28 crates = 17,500
Might double
GRETINA
EPICS Meeting 2005