1. Overview of GRETINA I-Yang Lee Lawrence Berkeley National Laboratory GRETINA Auxiliary Detector Workshop Washington University 28 - 29 January 2006

2. Outline  Status  Mechanical interface  Data acquisition interface  Summary

3. Highlight of recent achievements  Obtained CD2A/CD3A approval, 6/16/05  Purchase 3 detectors  Awarded detector contract 9/30/05  1 detector, with options for 7 total  Published prototype II in-beam test results  Obtained 2 mm position resolution  Refurbished prototype II detector  With 18 cold and 18 warm FETs  Tested prototype III detector module

4. Signal decomposition meeting

5. Status of mechanical structure  Completed conceptual design, except for the quarter sphere.  Carried out finite element analyses to ensure the required rigidity of the support structure.  Studying installation at potential sites.  Fabrication drawings for hexapod are being made.  Schedule to complete 3/31/06

6. Installation at potential sites Cave 4C, 88” Cyclotron LBNL FMA, ATLAS ANL RMS, HRIBF ORNL S800, NSCL MSU  Collected 3D drawings  Visited MSU, ANL and ORNL  Challenges : - Position GRETINA at the ideal location of the spectrographs. - Detector at forward angle at NSCL  Proposed a 4-ring design  Modification to fit ANL and ORNL Detector angles: 31.7º (5 positions), 58.3º (4), 90º (8), and 121.7º (4)

7. Target chamber ∎ Target to Ge = 17.8 cm ∎ Inner radius = 17 cm ∎ Cord radius = 16 cm 6 Ports ∎ Beam in ∎ Beam out ∎ Target/cable x2 ∎ Target port at 90º ∎ Viewing port

8. Electronics status  Completed electronics requirement document  Studied the Eurisys pre-amplifier.  Completed the grounding and shielding design.  Tested selected signal cables, and connectors.  Decided to implement trigger serializers using FPGAs and standard protocols Twisted pair with shielding Drain wire for pairs Cable drain wire Cable shielding Jacket

9. Computing system status  Completed Computing system requirement document  Integrated software to perform end-to-end test – Detector signal  crystal event building  signal decomposition  global event building  tracking  disk  Improved data acquisition software – Eliminated errors – New run control system  Design and purchased prototype computer cluster (with 8 nodes)

10. Data Acquisition System  Signal digitizer  Network switch  Workstations Data Acquisition System Schematic Aux. Det. Trigger Global Trigger Module Signal Digitizers Local Trigger Module Network Switch Processing Farm 28 Crystals Data Storage 2.2 MB/s Aux. Det. Data 66 MB/s 75 dual Processors Workstations, Servers 6.9 MB/s 2.3 MB/s + Aux. Det. Data  Trigger/timing system  Processing farm  Data storage

11. Data Acquisition GRETINAAuxiliary Detector Trigger Each segment generates and receives trigger FPGA based trigger unit Accept and provide multiple trigger types Timing Each segment has LED and CFD time stamps At least one time stamp per event Readout Buffered readout for each module Two-level event building, crystal and global Analog signals Digitized data streams Ethernet packets

12. Auxiliary detector interface  Trigger in/out  Time stamp  Data read out  Interface options Analog signals Digitized data streams Ethernet packets Data Acquisition System Schematic Aux. Det. Trigger Global Trigger Module Signal Digitizers Local Trigger Module Network Switch Time Aux. Detector Interface crate Time stamp Aux. Detector crates FERACAMAC TDCTDC ADCADC Clock Ethernet packets Analog signal FERA data stream

13. Acquisition interface options Additional hardware and software are not funded currently

14. Auxiliary detector interfacing issues Mechanical –Space inside chamber –Vacuum –Cable and target ports –Interference with external structure and detectors Data acquisition –Number of allowed interface options –Additional hardware needs –Additional software efforts

15. New auxiliary/external detectors Super-CHICO

16. Schedule WBSTask Name 1GRETINA 1.1Mechanical 1.1.2Design 1.1.3Production 1.2Detector Module 1.2.1Purchasing 1.2.2Test/Characterize Module 1 1.2.3Test/Characterize Rest of Modules 1.3Electronics 1.3.2Prototype 1.3.3Production 1.4Computing Systems 1.4.2Prototype 1.4.3Production 1.5System Assembly 1.5.1Prototype 1.5.2Production 1.6Project Management 1.7Environment and Safety 1.12Level 1 Milestones: Critical Decisions CD1 CD2/3A CD2/3B CD4 Complete test proc. and apparatus Award module contract Exercise option last module Complete mechanical subsystem Complete test DSP module Start production DSP module Award computer farm contract Ready for prototype assembly Ready for final assembly CD0 3412341234123412341234123412341234 200320042005200620072008200920102011 Complete test/char. module Complete design/draw. support structure January 2006

17. Summary  GRETINA is on budget and on schedule.  In 2006 design work of all systems will be in progress  Process of design interface with auxiliary detector  Developed requirement documents  Working with potential sites and working groups  Make decisions on design  Designs  Auxiliary/external detectors are essential  Many challenges and opportunities for auxiliary detectors  This workshop is an important step in advancing the state-of-the-art

18. FMA Efficiency  48 Ca + 124 Sn 200 MeV  Target 1 mg/cm 2  Acceptance 5 cm Dia.

19. S800 Efficiency

20. RMS Efficiency Nominal target to quad distance = 72 cm Acceptance angle= ± 30 mr (H), ± 100 mr (V)