17 juil 09 Hybrid source @ 8GeV: particles distributions after the crystal and after the amorphous

A 8 GeV electrons beam (composed by  1.1e+4 particles) impinge on a <111> oriented tungsten crystal of 1mm thickness.

Particles at the exit of the crystal

For display reason a cut is apply on px and py value (abs(px&&py)<20 MeV/c).

First case a transverse distribution of sigma=1mm is added to the particles transverse distribution

Electrons phase space at the exit of the crystal

Photons phase space at the exit of the crystal

Positrons phase space at the exit of the crystal

Second case a transverse distribution of sigma=2.5mm is added to the particles transverse distribution

Electrons phase space at the exit of the crystal

Photons phase space at the exit of the crystal

Positrons phase space at the exit of the crystal

Particles at the exit of the amorphous

The photons at the exit of the crystal is use to impinge on 8mm amorphous tungsten
(for 2.5mm rms value)
After the amorphous px,py and pz are defined by the following

Photons phase space at the exit of the amorphous

Electrons phase space at the exit of the amorphous

Positrons phase space at the exit of the amorphous

Tags: channeling, hybrid source, positron source

14 avr 09 Production of positron using gamma from Bremsstralhung

A 10GeV mono energetic electron beam (with au gaussian distribution in x and y
-in root : gRandom->Gaus(0,2.5e-3)/sqrt(2.)-) impinging on 0.1 cm amorphous tungsten produced gamma with this phase space (yield=#gamma/#e-=138966/50000~2.78)

Gamma energy distribution

X distribution

Y distribution

Those gamma are using to produce positron by impinging on 0.8 cm of amorphous tungsten
(distance between the two amophous target is 2m).
Positron phase space distribution(yield=#positron/#electron=143443/50000 ~2.86)

Energy distribution

X distribution

Y distribution

Momentum in X distribution

Momentum in Y distribution

Momentum in Z distribution

Tags: bremsstralhung, positron

01 avr 09 Hybrid source: positrons distribution

(Robert Chehab’s graphic and summary)
In the following we took:

For both case (10 GeV and 5 GeV) the inital x and y electron distribution follow (ROOT syntax)

x=gRandom->Gaus(0,2.5e-3)/sqrt(2.); // gaussian centered x=0 with rms_x=2.5mm
y=gRandom->Gaus(0,2.5e-3)/sqrt(2.); // gaussian centered y=0 whith rms_y=2.5mm

Electron beam energy : 10 GeV

• Crystal thickness : 0.1 cm
• Distance between amorphous and amorphous : 2m
• Amorphous thickness : 0.8 cm

(initial particles impinging on the crystal = 5000 macro e-)

Photons energy spectrum

Positrons phase space after the amorphous target

Energy (no energy cut)

Energy (below 400 MeV):

X:

Y:

Px:

Py:

Positrons spatial distribution after capture section (AMD)

AMD caracteristics

Transverse phase space of the positrons from the target.
We apply a cut in the radius, r<20mm corresponding to the aperture of the
pre-accelerating cavities.

In blue after the amorphous and in red after the AMD

Angle distribution

Electron beam energy : 5GeV

• Crystal thickness : 0.14 cm
• Distance between amorphous and amorphous : 2m
• Amorphous thickness : 1 cm

(initial particles impinging on the crystal = 6000 macro e-)

Photons energy spectrum

Positrons phase space after the amorphous target

Energy (no energy cut):

Energy (below 200 MeV):

X:

Y:

Px:

Py:

Positrons spatial distribution after capture section (AMD)

AMD caracteristics

Transverse phase space of the positrons from the target.
We apply a cut in the radius, r<20mm corresponding to the aperture of the
pre-accelerating cavities.

In blue after the amorphous and in red after the AMD

Angle distribution

EXTRA …
(thanks to Laurent Garnier Qt implementation see http://users.lal.in2p3.fr/garnier/G4QtTutorial.html#interface)

g4movie2

Tags: AMD, channeling, hybrid source, positron

17 fév 09 Production of polarised positron using Bremsstralhung

Initial parameters :

• e- beam 80-50 MeV normal incidence, stat. 10^6
• 100% longitudinal electron polarisation S(0,0,1)
• Tungsten target of 1×X0 = 3.5 mm (Z=74, ρ = 19.3 g/cm3)

Positron Yield = Ne+/Ne- ~ 15 %
Energy deposited in the tungsten target per initial incident electron ~ 14 MeV
Mean positron polarisation : Sz ~ 30 %
Modification of the positron yield, positron polarisation considering differents target thickness and
two differents inital electron energy (50 MeV and 80 MeV)

Initial electron energy 50 MeV

Positron Yield versus target thickness (different energy selection are shown)

Mean positron energy versus target thickness (different energy selection are shown)

Positron polarisation versus target thickness (different energy selection are shown)

Initial electron energy 80 MeV

Positron yield versus target thickness (different energy selection are shown)

Mean positron energy versus target thickness (different energy selection are shown)

Positron polarisation versus target thickness (different energy selection are shown)

Statics studies

Tags: bremsstralhung, positron, positron polarisation

22 jan 09 Interaction e- et gamma de 100 MeV sur Tungsten

J’ai cherché désespérément  ces informations pour cross checker ma simulation Geant4:
Nombre particules secondaires créées et leur pertes d’énergie dans la cible.
Taille de la cible de Tungsten(G4_W densité 19.3 g/cm3) 3.5mm (*20cm*20cm)
Uniquement les processus EM pris en compte pas de flag hadronique i.e pas de création de neutrons 

1) Run  10000 gamma de 100 MeV

Gamma
Mean Number per Event : 3.127400 
Mean Kinetic Energy : 22.142556 MeV +- 37.196105 MeV 
Energy deposited in the target per incident particles  0.133872 MeV 

Electrons
Mean Number per Event : 0.406800 
Mean Kinetic Energy : 30.026098 MeV +- 24.451613 MeV 
Energy deposited in the target per incident particles  3.404414 MeV 

Positron
Mean Number per Event : 0.366600 
Mean Kinetic Energy : 33.335758 MeV +- 23.974807 MeV 
Energy deposited in the target per incident particles  2.190985 MeV 

Soit 5.73 MeV déposée dans la cible de tungstène par gamma incident

2) Run  10000 e- de 100 MeV

Gamma
Mean Number per Event : 6.670000
Mean Kinetic Energy : 7.301013 MeV +- 13.162204 MeV
Energy deposited in the target per incident particles 0.345439 MeV

Electrons
Mean Number per Event : 1.068500
Mean Kinetic Energy : 31.868788 MeV +- 24.521092 MeV
Mean Polarization :0.000000 +- 0.000000
Energy deposited in the target per incident particles 12.372011 MeV

Positron
Mean Number per Event : 0.183000
Mean Kinetic Energy : 14.930346 MeV +- 13.545201 MeV
Energy deposited in the target per incident particles 1.234059 MeV

Soit 14 MeV déposée dans la cible de tungstène par e- incident

Tags: pedd, production positrons, tungsten

26 nov 08 Experience:the ILC VO

Article tiré de ILC newsline

Tags: grid, ilc VO, lcg

17 nov 08 Expérience de recherche

Tags: BDSIM, borexino, geant4, ilc, LCG/EGEE, MDI, neutrino, polarisation, positron, positrons polarisés, Positrons source, ROOT

16 oct 08 Publications

1. Improved 2mrad crossing angle layout for the International Linear Collider
   Philip Bambade, S. Cavalier, O. Dadoun (Orsay, LAL) , D.A.K. Angal-Kalinin (Daresbury) , Robert Barrie Appleby, D. Toprek (Manchester U.) . PAC07-THPMN077, Jun 2007.
   In the Proceedings of Particle Accelerator Conference (PAC 07), Albuquerque, New Mexico, 25-29 Jun 2007, pp 2883
2. GUINEA PIG++ : An Upgraded Version of the Linear Collider Beam Beam Interaction Simulation Code GUINEA PIG
   D. Schulte (CERN) , M. Alabau (Valencia U., IFIC) , Philip Bambade, O. Dadoun, G. Le Meur, C. Rimbault, F. Touze (Orsay, LAL) . PAC07-THPMN010, Jun 2007.
   In the Proceedings of Particle Accelerator Conference (PAC 07), Albuquerque, New Mexico, 25-29 Jun 2007, pp 2728. 
3. Backscattering of Secondary Particles into the ILC Detectors from Beam Losses Along the Extraction Lines
   Philip Bambade, O. Dadoun (Orsay, LAL) . PAC07-THPMN009, Jun 2007.In the Proceedings of Particle Accelerator Conference (PAC 07), Albuquerque, New Mexico, 25-29 Jun 2007, pp 2725.
4. Technical Challenges for Head On Collisions and Extraction at the ILC
   O. Delferriere et al. PAC07-THPMN005, Jun 2007.
   In the Proceedings of Particle Accelerator Conference (PAC 07), Albuquerque, New Mexico, 25-29 Jun 2007, pp 2716
5. Design of the Beam Delivery System for the International Linear Collider
   A. Seryi et al. FERMILAB-CONF-07-473, SLAC-PUB-12743, Aug 14, 2007. 3pp.
   Presented at Particle Accelerator Conference (PAC 07), Albuquerque, New Mexico, 25-29 Jun 2007.
   Published in *Albuquerque 2007, Particle accelerator* 1985-1987
6. Evaluation of luminosity reduction in the ILC head-on scheme from parasitic collisions
   J. Brossard, P. Bambade, O. Dadoun, T. Derrien (Orsay, LAL) , M.C. Alabau-Pons (Orsay, LAL and Valencia U.) , O. Napoly, J. Payet (Saclay) , D. Angal-Kalinin (Daresbury) . EUROTEV-REPORT-2007-052, Jul 2007. 4pp.
   Prepared for Particle Accelerator Conference (PAC 07), Albuquerque, New Mexico, 25-29 Jun 2007.
7. Technical challenges for head-on collisions and extraction at the ILC
   O. Napoly et al. SLAC-PUB-12744, EUROTEV-REPORT-2007-043, Jun 2007. 3pp.
   Prepared for Particle Accelerator Conference (PAC 07), Albuquerque, New Mexico, 25-29 Jun 2007.
8. Improved 2-mrad crossing angle layout for the International Linear Collider.
   R. Appleby, D. Toprek (Manchester U. & Cockcroft Inst. Accel. Sci. Tech.) , D. Angal-Kalinin (Cockcroft Inst. Accel. Sci. Tech.) , P. Bambade, S. Cavalier, O. Dadoun (Orsay, LAL) . EUROTEV-REPORT-2007-022, Jun 2007. 3pp.
   Prepared for Particle Accelerator Conference (PAC 07), Albuquerque, New Mexico, 25-29 Jun 2007.
   Published in *Albuquerque 2007, Particle accelerator* 2883-2885
9. BDSIM: Beamline simulation toolkit based on GEANT4.
   I. Agapov, J. Carter, G.A. Blair (Royal Holloway, U. of London) , O. Dadoun (Orsay, LAL) . EUROTEV-REPORT-2006-035, 2006. 3pp.
   Prepared for European Particle Accelerator Conference (EPAC 06), Edinburgh, Scotland, 26-30 Jun 2006.
10. Response to the critics of Borexino result in  »A New experimental limit for the stability of the electron » by H.V. Klapdor-Kleingrothaus, I.V. Krivosheina and I.V. Titkov
    By Borexino Collaboration (H.O. Back et al.). Mar 2007. 5pp.
    e-Print: hep-ex/0703044
11. BDSIM: Beamline simulation toolkit based on GEANT4.
    I. Agapov, J. Carter, G.A. Blair (Royal Holloway, U. of London) , O. Dadoun (Orsay, LAL) . EUROTEV-REPORT-2006-035, 2006. 3pp.
    Prepared for European Particle Accelerator Conference (EPAC 06), Edinburgh, Scotland, 26-30 Jun 2006.
    Published in *Edinburgh 2006, EPAC* 2209-2211
12. The BDSIM toolkit.
    I. Agapov, G.A. Blair, J. Carter (Royal Holloway, U. of London) , O. Dadoun (Orsay, LAL) . EUROTEV-REPORT-2006-014, Mar 2006. 33pp.
    DESY Document Server
13. Design of an interaction region with head-on collisions for the ILC.
    R. Appleby et al. SLAC-PUB-11950, LAL-RT-06-09, EUROTEV-REPORT-2006-083, Jun 2006. 4pp.
    Presented at European Particle Accelerator Conference (EPAC 06), Edinburgh, Scotland, 26-30 Jun 2006.
    e-Print Archive: physics/0609248
14. Optimization of the e- e- option for the ILC.
    M. Alabau Pons, P. Bambade, O. Dadoun (Orsay, LAL) , R. Appleby (Manchester U.) , A. Faus-Golfe (Valencia U., IFIC) . LAL-RT-06-08, EUROTEV-REPORT-2006-067, CARE-ELAN-2006-007, Jun 2006. 4pp.
    e-Print Archive: physics/0609043
15. Benchmarking of Tracking Codes (BDSIM/DIMAD) using the ILC Extraction Lines.
    R. Appleby (Manchester U.) , P. Bambade, O. Dadoun (Orsay, LAL) , A. Ferrari (Uppsala U.) . LAL-RT-06-06, EUROTEV-REPORT-2006-038, Jun 2006. 4pp.
    Contributed to European Particle Accelerator Conference (EPAC 06), Edinburgh, Scotland, 26-30 Jun 2006.
    e-Print Archive: physics/0607165
16. Particle tracking in the ILC extraction lines with DIMAD and BDSIM.
    R. Appleby (Manchester U.) , P. Bambade, O. Dadoun (Orsay, LAL) , A. Ferrari (Uppsala U.) . LAL-RT-06-05, EUROTEV-REPORT-2005-026, Jun 2006. 11pp.
    e-Print Archive: physics/0607163
17. Design of an Interaction Region with Head-On Collisions for the ILC.
    J. Payet et al. SLAC-PUB-11950, Jul 12, 2006. 4pp.
    Presented at European Particle Accelerator Conference (EPAC 06), Edinburgh, Scotland, 26-30 Jun 2006.
18. The 2mrad Crossing Angle Interaction Region and Extraction Line.
    R. Appleby et al. SLAC-PUB-11952, Jul 12, 2006. 4pp.
    Presented at European Particle Accelerator Conference (EPAC 06), Edinburgh, Scotland, 26-30 Jun 2006.
19. ATF2 Proposal Vol.2.
    B.I. Grishanov et al.. DESY-06-001, CERN-AB-2006-004, ILC-ASIA-2005-26,
    JAI-2006-001, KEK-REPORT-2005-9, SLAC-R-796, UT-ICEPP-05-04, Feb 2006. 43pp.
20. PHENYLXYLYLETHANE (PXE): a high-density, high-flashpoint organic liquid scintillator for applications in low-energy particle and astrophysics experiments.
    By Borexino Collaboration (H.O. Back et al.). MPIK-2003-059, Aug 2004. 45pp.
    Submitted to Nucl.Instrum.Meth.A
    e-Print Archive: physics/0408032
21. New experimental limits on violations of the pauli exclusion principle obtained with the BOREXINO Counting Test Facility.
    By Borexino Collaboration (H.O. Back et al.). Jun 2004. 10pp.
    Published in Eur.Phys.J.C37:421-431,2004
    e-Print Archive: hep-ph/0406252
22. White paper report on using nuclear reactors to search for a value of theta(13).
    K. Anderson et al. FERMILAB-PUB-04-180, Jan 2004. 167pp.
    e-Print Archive: hep-ex/0402041
23. New experimental limits on heavy neutrino mixing in B-8 decay obtained with the BOREXINO Counting Test Facility.
    Published in JETP Lett.78:261-266,2003, Pisma Zh.Eksp.Teor.Fiz.78:707-712,200300
24. New limits on nucleon decays into invisible channels with the BOREXINO Counting Test Facility.
    By Borexino Collaboration (H.O. Back et al.). Feb 2003. 22pp.
    Published in Phys.Lett.B563:23-34,2003
    e-Print Archive: hep-ex/0302002
25. Study of the neutrino electromagnetic properties with prototype of borexino detector.
    H.O. Back et al. JINR-E1-2002-29, Apr 2002. 17pp.
26. BOREXINO.
    By Borexino Collaboration (G. Ranucci et al.). Jul 2001.
    Prepared for NO-VE International Workshop on Neutrino Oscillations in Venice, Venice, Italy, 24-26 Jul 2001.
    Published in *Venice 2001, Neutrino oscillations* 105-116 Also in *Tokyo 2000, Low energy solar neutrino detection*47-56
27. Search for electron decay mode e –> gamma + nu with prototype of BOREXINO detector.H.O. Back et al.. JINR-E1-2002-30, 2002. 19pp.
    Published in Phys.Lett.B525:29-40,2002
28. Measurements of extremely low radioactivity levels in BOREXINO.
    By BOREXINO Collaboration (C. Arpesella et al.). Sep 2001. 27pp.
    Published in Astropart.Phys.18:1-25,2002
    e-Print Archive: hep-ex/0109031

16 oct 08 Présentations

Parametric optimization of the hybrid source using channeling

Hybrid source studies

Backscattered photon rates in VD

Backscattering of photons into the ILC Detectors from Beam Losses Along the Extraction

Background in LDC Detector from backscattered photons induced by beam losses in the extraction line

EGS-GEANT4 (« Polarised version ») benchmark

Background in the detector from beam losses in the extraction line

Machine Detector Interface at ILC

Grid Computing

Evaluation of Backscattered photons from beamstrahlung loss at the intermediate dump in HeadOn extraction line

Estimated photons backscattering from beam losses in the 2mrad ILC extraction line

EUROTeV phonemeeting October 06

Background from beam losses in ILC extraction line – Setup BDSIM on grid

Background from losses along the 20mrad ILC extraction line

Grid Computing (Introduction and Parachute method)

Towards estimating backgrounds from beam losses along the ILC extraction line case of 20mrad with high luminosity parameters

BDSIM simulation

Extraction line simulation using BDSIM

Benchmarking of BDSIM and DIMAD for extraction line design

Tags: BDS, geant4, grid, ilc, MDI, production positrons

16 oct 08 Neutrinos

Borexino est l’expérience grâce à laquelle la « détection en temps réel » des neutrinos solaires de la raie de ⁷Be à 862 keV se fois. Rappelons que toutes les expériences de neutrinos solaires menées jusqu’à présent, n’offraient pas la possibilité d’effectuer conjointement une mesure du taux de neutrinos de basse énergie et une étude de sa variation temporelle. Qui plus est, le taux journalier attendu de neutrinos du ⁷Be est élevé, assurant ainsi une grande statistique : on attend environ 45 événements par jour dans le cadre du Modèle Standard du Soleil, à 12 événements par jour dans le cas d’une conversion complète de neutrinos.

L’expérience Borexino, ainsi que son prototype CTF, se situent au LNGS (Gran Sasso INFN Italie) dans le Hall C du laboratoire souterrain. J’ai participé durant mes années de thèse à l’implantation de l’électronique, au programme d’acquisition et j’ai travaillé sur la « Mesure des neutrinos de réacteurs nucléaires dans l’expérience Borexino » (j’ai mis une limite sur le bruit de fond attendu pour cette mesure au travers d’une analyse de données du prototype CTF). Ce travail fût l’objet de ma thèse.