K.Walaron PID review (Oct 12th 2006) R.A.L

Particle Information from Beamline Simulations

K. WalaronUniv. of Glasgow/ R.A.L

Overview Beamline introduction Details on beamline parameters for

6/10pi beamlines Beamline simulations XY plots (TOF0/TOF1/CKOV1) Ptot plots (TOF0/TOF1/CKOV1) TOF separation TOF v Ptot with approximated resolution

Goals of beamline

Provide matched beams of variable emittance and momenta

P =140,200,240MeV/c. Emitt4D=Low,6,10pi mm mrad

Provide pion/muon separation

Beamline Layout

TOF1CKOV1 (old design)TOF0

Quad triplet

Quad triplet

Dipole 2

Beamline Simulations Tracking program used is G4Beamline (GEANT4 based) No sensitive detector implementation in G4beamline.

Only MC truth output of particles crossing planes. Analysis chain:Track beam using G4BLMany runs with Pi+ decay offRun with Pi+ decay onOutput ascii filesTo produce high pi+ stats ~100M pi+ tracked from targetTo produce mu+ stats ~10M pi+ tracked from targetC++/scripts order tracks and output Root fileAnalysis in rootDidn’t have time to make plots look nice. Apologies in

advance.

TOF’s and old CKOV implementation

Old CKOV implementation (z=21.060)

TOF0 & TOF1 implementation

TOF0 Polyethelene, density=0.93g/cm^3

50cmx50cm z=20.810m

TOF1 Polyethelene, density=0.93g/cm^3

48cmx48cm z=28.871m

New CKOV 1a and 1b implementation

Assumption

6pi 200 MeV/c (215.31 <Emu<252.2) Red=NEW, BLUE=OLD

TOF0 CKOV1 TOF1 TOF0 CKOV1 TOF1

TOF0 CKOV1 TOF1TOF0 CKOV1 TOF1

10pi 200 MeV/c (215.31 <Emu<252.2) Red=NEW, BLUE=OLD

TOF0 CKOV1 TOF1 TOF0 CKOV1 TOF1

TOF0 CKOV1 TOF1TOF0 CKOV1 TOF1

XY dist TOF0 (combined pi/mu for 6pi and 10pi

6pi 10pi

y (

cm

)

x (cm) x (cm)

CKOV1 beam spoty (

cm

)

x (cm)

No cut on singles

XY dist TOF1 (combined pi/mu for 6pi and 10pi

6pi 10pi

y (

cm

)

x (cm) x (cm)

Ptot dist TOF0 (combined pi/mu for 6pi and 10pi

6pi 10piPtot (MeV/c) Ptot (MeV/c)

Ptot dist CKOV1 (combined pi/mu for 6pi)

Ptot (MeV/c)

Ptot dist TOF1 (combined pi/mu for 6pi and 10pi

Ptot (MeV/c) Ptot (MeV/c)

6pi 10pi

TOF (combined pi/mu for 6pi and 10pi

6pi 10pi

Gaussian TOF spread

MC truth V MC truth_spread

TOF (MC truth) v Ptot@Tracker1 (MC truth) 6pi, 10pi.

Ptot (MeV/c)

T (

ns)

TOF (spread) v Ptot@Tracker1 (MC truth) 6pi, 10pi.

70ps gaussian spread on TOF0 & 1

6pi mm mradPtot (MeV/c)

T (

ns)

10pi mm mrad

70ps gaussian spread on TOF0 & 1

Beamline purity (sampled at TOF0)

Tune Particle % of beam content

CM14-200-6pi Proton 0

pi+ 0.2

mu+ 99.6

e+ 0.2

CM14-200-10pi Proton 0

pi+ 0.2

mu+ 99.7

e+ 0.1

Rates old/new CKOV designs (uncollimated)

OLD

NEW

Rates with new CKOV design and collimation (6pi tune only)

TOF0 1.591

CKOV1 1.511

TOF1 0.662

Tracker1a

0.634

Good mu+

0.493

TOF0 2.731

CKOV1 2.578

TOF1 1.061

Tracker1a

1.017

Good mu+

0.747

11cm horiz collimation 21cm horiz collimation

Conclusions Detector sizes are at least sufficiently wide

to capture the particles making it to tracker1. Make them smaller..

Implementation of new CKOV design should provide no problem for future tunes.

Singles rates are a problem for TOF0. Likely to need collimation to bring rate down to required 1.5 MHz.

Real conclusions should be from reviewers!