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Measurement of the Target-Normal Single-Spin Asymmetry in Deep-Inelastic Scattering from the Reaction 3 He ↑ ( e,e ’)X Phys . Rev. Lett . 113, art. no. 022502 JUL 11 2014. SuperB igbite Spectrometer in Hall A. Large luminosity Moderate acceptance Forward angles Reconfigurable detectors.

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Measurement of the Target-Normal Single-Spin Asymmetry in Deep-Inelastic Scattering from the Reaction 3He↑(e,e’)X

Phys. Rev. Lett. 113, art. no. 022502 JUL 11 2014

superb igbite spectrometer in hall a
SuperBigbite Spectrometer in Hall A
  • Large luminosity
  • Moderate acceptance
  • Forward angles
  • Reconfigurable detectors


photon (250-500 MHz/cm2) charged (160-200 kHz/cm2)


Nucleon Form Factors


... Nucleon structure

Front tracker reused in BigBite


Main Technical solutions

  • Use the COMPASS approach: 3xGEM, 2D readout - onesignificantdifference: use new single mask GEM foil (instead of double mask) – cheaper and faster production
  • Modular design: chambersconsists of 3 independent GEM modules (40x50 cm2) with thin dead area
  • Electronicsaround the module, direct connection; 90 degree bending betweenmodules
  • Externalsupport frame in carbon fiber (long bars) to minimizethermaldeformation

40x50 cm2


Front Tracker Chamber: 40x150 cm2


GEM Module construction process

Module production fully established in INFN-Catania

Electronics preliminary QA in Genoa

Module integration and characterization in INFN-Sanità

Permaglas Frames

Visual Inspection

Ultrasound bath


GEM Foils

HV curing and

quality test




Production rate

2 modules in 3 months

Put together

(align on reference pins)



gas lines

(improvement under development,

no signficant impact on cost/production)

Clean room

Glue Curing

in vacuum bag

(>24 h)

Electronics integration

Test and characterization

by rad. source and cosmics


(solder resistor, check HV)

SBS Coll. Meeting - Front Tracker GEM

sbs gem tracker test beam jan 2014


Pixel Telescope

3 Big GEMs


Small GEM

SBS GEM Tracker - Test Beam / Jan 2014
  • Small scale final system (gas, LV, HV monitored)
  • Main Goals:
  • Characterize chambers in terms of charge sharing, efficiency and spatial resolution at different HV, gas mixture.
  • Figure out the gain variation of the previous test

1-4 GeV



AIDA-EUDET support

→ Got lot\'s of good data with high spatial resolution information from pixel telescope

→ Stable performance (“all” conditions carefully monitored)

kalman filter reconstruction simulation

TrackAssociation by NN / Simulation

Kalman Filter Reconstruction: simulation

Sij – neuron (0 or 1) – connection between two points




Neuron changing rate

gem production and test status
GEM Production and Test Status
  • The very first 4 GEM foils did not pass the original quality checks, 3 recent GEM foils of the same bunch did not pass the new quality check
  • One readout + honeycomb suffered bad gluing (probably still usable)
  • 2 of the GEM modules passed preliminary tests but then degraded significiantly (large dark current); one recovered after N2 gas cleaning.
  • * soldering problem, bug fixed by the company

SBS Coll. Meeting - Front Tracker GEM

gem tracker activity 2014 2015
GEM Tracker Activity 2014-2015
  • Continue Production
  • Test, Characterization and Calibration of GEM and electronics
  • Fix damaged modules/material, replace if no fix possible
  • Finalization of a rubust and efficient track reconstruction algorithm
  • Complete and test the complex firmware of the DAQ
  • Study (and solve) open issues
electronics for gem and sid
Electronics for GEM and SiD

VME Module (MPD) ver. 4.0 firmware upgrade

  • Revised memory mapping
  • Event builder implemented and simulated:
    • Multiblock (compliant to JLab request)
    • 24 bit, packed to 32 bit on 64 bit boundary for efficiency
    • 128MB FIFO data buffer using DDR2 SDRAM (pretty complex code)
  • D64 read only cycle implemented: MBLT, 2eVME, 2eSST (3 cycles):
    • 2eSST tested on STRUCK SIS-3104 (2 Gb/s optical link that limit the band)
  • To be done
    • Multiboard block transfer
    • Firmware for fiber optic protocol (important if modules will sit near the front-end electronics)
    • Deep debug and test (implies rewriting of some DAQ code)
    • Minor development to reduce backplane material budget and add flexible kapton bus (for SiD)
    • Study long cable induced noise

SBS Coll. Meeting - Front Tracker GEM




9Be(e,e’K)9LiL (G.M. Urciuoli, F. Cusannoet al. Submitted to PHYS REV C)

Radiative correctedexperimentalexcitationenergy vs theoretical data (thin green curve). Thick curve: fourgaussianfits of the radiative corrected data

Experimentalexcitationenergy vs Monte Carlo Data

(red curve) and vs Monte Carlo data with radiative

Effects“turned off” (blue curve)

An elementary model for the (e,e′K+) reaction with a different balance of spin-flip and non-spin-flipamplitudesmight help to resolve the disagreement with theory of the relative strenght of the peaks in the doublets

experiment e07 002
Experiment E07-002

Present result for KLL in E07-002 seems to confirm previous measurement of E99-114, at a different angle. Work in progress.

Study of systematic uncertainties is undergoing.

Optimize analysis in order to conclude that at our energy

regime, pQCD predictions are excluded.

With those points included, ready for publication