Pete Jones University of Jyväskylä INTAG Workshop GSI, Germany May 2007 Status of digital electronics at JYFL Pete Jones Department of Physics University of Jyväskylä, Finland

Pete Jones University of Jyväskylä INTAG Workshop GSI, Germany May 2007 Task 1 - Improvement of RDT method (Jyväskylä) Extend the method from -decay tagging to - tagging, for the study of N~Z nuclei. Requires high granularity and small signal detection. General testing of the method will be carried out using the focal plane spectrometer (segmented Si – Ge array). Subtask “Focal plane RDT detectors": Extension of GREAT and other focal plane spectrometers to include segmented planar Ge and large clover Ge (Daresbury, Liverpool); extension of the RDT method from a-decay tagging to - tagging (Daresbury, Jyväskylä, Liverpool); conceptual design of ASICs (Saclay). Subtask “Prompt radiation spectrometers for RDT": Digitisation of signals from detectors for prompt radiation (Daresbury, Jyväskylä, Liverpool); development of new prompt radiation spectrometers (Daresbury, Jyväskylä, Liverpool). Subtask “RDT detector exploitation”: Marry extended GREAT to focal plane of RITU, in-beam testing; provide RITU expertise and accelerated beams (Jyväskylä).

Pete Jones University of Jyväskylä INTAG Workshop GSI, Germany May 2007  Digital Electronics Basics  Why ?  How ?  Aims for Instrumentation & Testing at JYFL  Results  Future Developments for Digital Electronics  Instrumentation for Tagging Contents

Pete Jones University of Jyväskylä INTAG Workshop GSI, Germany May 2007 Digital Electronics Basics V. T. Jordanov and G. F. Knoll, “Digital synthesis of pulse shapes in real time for high resolution radiation spectroscopy,” Nucl. Instr. and Meth. A345 (1994) L. Arnold et al., “TNT Digital Pulse Processor”, IEE Trans. Nucl. Sci. 53 (2006) Two Modes: 1)Traces (Oscilloscope) - Digitisers 2)Energy Mode (Trapezoids) Traces sampled (fixed time) Digital sampling, online calculations Generate CFD & Trapezoid for E calculation

Pete Jones University of Jyväskylä INTAG Workshop GSI, Germany May 2007 Why? Advantages… Test Experiment with TNT Summer 2005  107,109 Ag( 36 Ar,2p2n) 139 Eu  160 MeV β~2.5%  I b =5 – 50 pnA  Ge count rate kHz  RITU Gas counter 1-10kHz

Pete Jones University of Jyväskylä INTAG Workshop GSI, Germany May 2007 How? TDR  Triggerless Data Acquisition System  Own 100MHz clock distributed for all TDR components  SYNC pulses distributed  RESYNC Pulse (T 0 ) at 10ns precision  Information: Energies and timestamps for all detectors  -> Germanium energies and times  -> BGO timestamps for online Compton Suppression

Pete Jones University of Jyväskylä INTAG Workshop GSI, Germany May 2007 How? TNT  4 channels per card – USB readout  Master / Slave with Own 100MHz distributed clock  SYNC pulses from TDR  RESYNC Pulse (T 0 ) from TDR  Information: Energies and timestamps  -> Veto logic inputs for internal veto marking 2 Shuttles for 6 TNT cards 2 Event Collectors – Data conversion Time Synchonisation, Merging 1 System Merger for TNT & TDR

Pete Jones University of Jyväskylä INTAG Workshop GSI, Germany May 2007 Aims  Run both TDR (Focal plane & JUROGAM) & TNT (JUROGAM) together  Merge & timestamp to 10ns with 2 different clocks  Keep synchronisation  Investigate different algorithms for Compton Suppression  Compare analogue & digital produced datasets  Solve some “mysterious” problems P. Peura, Masters Thesis, JYFL (2007)

Pete Jones University of Jyväskylä INTAG Workshop GSI, Germany May 2007 Results I  202 Hg( 48 Ca, 2n) MeV – Herzberg et al.  TNT running in parallel  Offline correlations with TDR  Singles gamma or gamma-gamma  Ge rates ~5 kHz Syncronised data with TDR (Ge + BGO) Lower threshold ~17keV

Pete Jones University of Jyväskylä INTAG Workshop GSI, Germany May 2007 Results II  160 Dy( 48 Ca,4-5n) Rn  TNT running in parallel -> offline merge with TDR data  Strong recoil channel (1 hr)  Recoil tagged gamma’s Syncronised data with TDR (Ge + BGO) Lower threshold ~17keV Improved Linearity (INL ~ 0.001%)

Pete Jones University of Jyväskylä INTAG Workshop GSI, Germany May 2007 Results III  208 Pb( 48 Ca,2n) 254No  TNT running online in full mode with TDR data  Large cross-section  Ge’s ~13kHz (beam limited)  Recoil gates / tagged Full spectroscopy system for Tagging Extra work needed for veto selection R-D. Herzberg Nature, 442 (2006)

Pete Jones University of Jyväskylä INTAG Workshop GSI, Germany May 2007 Future & Digital Electronics… Lyrtech developments (Daresbury, Liverpool) for SMARTPET & SAGE projects Production of TDR cards & shapers cards in progress Synergies with other JRA’s for applications Algorithm development and input to future designs Investigate digitisation of signals for other detectors Application of digitisation for tagging methods

Pete Jones University of Jyväskylä INTAG Workshop GSI, Germany May 2007 Status of digital electronics at JYFL Summary Integration of TNT units with TDR completed & tested Comparison of analogue & digital data progressing Physics results – need for improvement Instrumentation for Tagging proved Development for other detectors possible Future applications & projects look promising