Status of digital electronics at JYFL

Pete JonesUniversity of Jyväskylä

INTAG WorkshopGSI, Germany

24-25 May 2007

Status of digital electronics at JYFLStatus of digital electronics at JYFL

Pete Jones

Department of PhysicsUniversity of Jyväskylä, Finland



24-25 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).



24-25 May 2007

Digital Electronics Basics Why ? How ?

Aims for Instrumentation & Testing at JYFL

Results

Future Developments for Digital Electronics Instrumentation for Tagging

Contents



24-25 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) 337-345

L. Arnold et al., “TNT Digital Pulse Processor”, IEE Trans. Nucl. Sci. 53 (2006) 723-728

Two Modes:1) Traces (Oscilloscope) - Digitisers2) Energy Mode (Trapezoids)

Traces sampled (fixed time)

Digital sampling, online calculationsGenerate CFD & Trapezoid for E calculation



24-25 May 2007

Why? Advantages…

Test Experiment with TNT Summer 2005

107,109Ag(36Ar,2p2n)139Eu 160 MeV β~2.5% Ib=5 – 50 pnA Ge count rate 10-100kHz RITU Gas counter 1-10kHz



24-25 May 2007

How?TDR Triggerless Data Acquisition System Own 100MHz clock distributed for all TDR components SYNC pulses distributed RESYNC Pulse (T0) at 10ns precision

Information: Energies and timestamps for all detectors -> Germanium energies and times -> BGO timestamps for online Compton Suppression



24-25 May 2007

How?TNT 4 channels per card – USB readout Master / Slave with Own 100MHz distributed

clock SYNC pulses from TDR RESYNC Pulse (T0) from TDR

Information: Energies and timestamps -> Veto logic inputs for internal veto marking

2 Shuttles for 6 TNT cards2 Event Collectors – Data conversion

Time Synchonisation, Merging1 System Merger for TNT & TDR



24-25 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)



24-25 May 2007

Results I 202Hg(48Ca, 2n) 248Fm @ 211 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



24-25 May 2007

Results II 160Dy(48Ca,4-5n)203-4Rn

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 ~17keVImproved Linearity(INL ~ 0.001%)



24-25 May 2007

Results III 208Pb(48Ca,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 TaggingExtra work needed for veto selection

R-D. Herzberg Nature, 442 (2006) 896-89



24-25 May 2007

Future & Digital Electronics…

Lyrtech developments (Daresbury, Liverpool) forSMARTPET & SAGE projects

Production of TDR cards & shapers cards in progressSynergies with other JRA’s for applications

Algorithm development and input to future designsInvestigate digitisation of signals for other detectorsApplication of digitisation for tagging methods



24-25 May 2007

Status of digital electronics at JYFLSummary

•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

Status of digital electronics at JYFL

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