Triggerinner liner work in Perugia KOPIO collaboration meeting

Trigger/inner liner work in Perugia KOPIO collaboration meeting Feb 7, 2004

2 Subjects l Trigger u u u l Inner liner u u u l Ermanno’s rate/efficiency estimates 10 X 10 tunable coincidence matrix Plans for simulation of “tracking” algorithms The detector scheme we have in mind Test program and status Simulation plans Manpower+financial situation Trigger/Inner liner – KOPIO meeting - 7/2/04

L 0 trigger: the bottom line of Ermanno’s simulation l Ingredients u u l Cluster counting on prerad+shashlik x-y “strips” integrated in depth Penetration condition (at least two adjacent layers in PR) Use of vetoes (± 5 ns time window) except v Far downstream v Catcher Prerad scintillator timing with resolution from position compensated coincidences Typical results u u Rate 32 k. Hz Efficiency 62% Trigger/Inner liner – KOPIO meeting - 7/2/04 3

4 Ermanno’s trigger simulatiom l Further simulation plans u u Test pattern recognition algorithms with sensitivity to track directions New undergraduate (Michele Viti) will start working on this Trigger/Inner liner – KOPIO meeting - 7/2/04

5 Improve PR online time resolution l Second prototype of x-y coincidence matrix with delay compensation 10 X 10 matrix on an ACTEL A 54 SX 08 A ( no placement & routing costraints ) Delay value set in 4 steps of ~0. 4 ns (value loaded serially) Trigger/Inner liner – KOPIO meeting - 7/2/04

6 Performance of 10 X 10 coincidence matrix l l l Measure delays of each output wrt first in same row/column: Reprogram delay values to 1. 3 ns per cell Histogram =(measured value) – (set value) Small tail of delays too large at minimum setting Can be improved with: § placement/routing constraints § higher speed-grade devices Trigger/Inner liner – KOPIO meeting - 7/2/04

7 I. L. : what we have in mind beam Legend: beam shashlik crystal l Assumptions: u u WLS bar/fibre u IL only inside Shashlik All crystals in a row parallel to beam axis can be read out with a single WLS plate running on top of the fins If crystals match the Shashlik modules they can be held in the same mechanical structure Trigger/Inner liner – KOPIO meeting - 7/2/04

8 Test setup l Motivated by u u l We plan to test u u l Results of Woody, Stoll, Frank, IEEE Trans. Nucl. Sci 42(1995)292 v BC 404: 85 p. e. /Me. V ( no longer produced by Bicron ) v BC 408: ~25% less ( no longer produced by Bicron ) Optical simulation by Mauro Raggi Bicron BC 408 3 mm Bicron BC 499 6 mm Kuraray SCSN-81 3, 6, 9 mm Kuraray SCSN-61 3 mm Test stand with tracking for cosmic rays u Expect to start sometimes in march Trigger/Inner liner – KOPIO meeting - 7/2/04

9 Cs. I crystal assembly Trigger/Inner liner – KOPIO meeting - 7/2/04

10 Cs. I crystal assembly Trigger/Inner liner – KOPIO meeting - 7/2/04

11 Absorption spectra BC-404 BC-408 BC-499 SCSF-81, 61 Trigger/Inner liner – KOPIO meeting - 7/2/04

12 Inner liner simulation studies l Need to learn u u u l Tools u u l Is inner liner needed ? Can we do without PR inner liner? What is an optimized configuration ? Inner liner geometry v Basic description included in KOPIO Geant v Has to be made compatible with subsequent modifications Fast/hybrid option of KOPIO GEANT MC v Developed and tested by Ermanno on version v 04 v If GEANT simulation only for tracks within 20 cm from the beam hole, execution time improved by >5 X v Note + update to version v 06 in preparation New undergraduate (Alessandro Grelli) will start working on this Trigger/Inner liner – KOPIO meeting - 7/2/04

13 Manpower + financial situation l The work described here has been performed by u u l l Material for crystal tests bought with INFN FY 2003 money Very small budget allocated by INFN on FY 2004 u l l Ermanno Imbergamo • research contract, now Ph. D student (NA 48) Riccardo Cenci • undergraduate, now Ph. D student in Pisa Mauro Raggi • now Ph. D. student (NA 48) N. Nappi, G. Anzivino, M. Valdata, P. Cenci v None at full time + some interests are shifting 4. 000(+4000)€ + 7000€ (travel) INFN has strongly recommended to enlarge the italian component of the collaboration Deadline for final assessment of interests in Perugia and Italy v 2005 budget requests, to be filled in june Trigger/Inner liner – KOPIO meeting - 7/2/04