Instrumentation and Simulations Instrumentation and Simulations for Target Testfor Target Test

Instrumentation and Simulations Instrumentation and Simulations for Target Testfor Target Test

MICE Collaboration MeetingMICE Collaboration Meeting22 October 2005.22 October 2005.

Bill Murray1, Paul Soler1,2, Kenny Walaron1,2 1Rutherford Appleton Laboratory

2University of Glasgow

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ISIS beam test (beg 2006)ISIS beam test (beg 2006)Proposed location of instrumentation: same angle as MICE beamline (25o) but inside synchrotron ring, at 10m or 20m from target

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protons

ISIS beam test (beg 2006)ISIS beam test (beg 2006) Two scintillator hodoscope planes separated by a polyethylene filter. If rate too high, use smaller plane in front. Location: 10 m (or 20 m) from target area Provides dE/dx signature and crude energy selection

dE/dx (MeV/cm)

P (GeV/c)

p,

Polyethylene filter

Segmented BC-404

scintillator

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Particle IdentificationParticle Identification10m from target 20m from target

pp

Use dE/dx to separate protons from light particles Allows us to count light and heavy species from target for validation of

beamline simulations Air affects average momentum and dE/dx for protons. For example, protons at 440 MeV/c drop by 20 MeV/c in 10 m air.

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Simulations for beam testSimulations for beam test Simulation using MARS input for G4beamline Selection of particles from target within acceptance at around 25o

p: 38%n: 57%

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Simulations for beam testSimulations for beam test 10 million protons generated in target Numbers of events in detectors (all detectors 1 cm thick to

start with):– Small scintillator (5 cm x 5 cm) at 9984 mm: 10 particles, 3 protons,

7 neutrons– Large scintillator 1 (40 cm x 40 cm) at 9994 mm: 775 particles, 288

protons, 460 neutrons, 8 pi+, 2 pi-, 3 mu+, 3 mu-– Absorber (40 cm x 40 cm) at 10005 mm: 745 particles, 274

protons, 448 neutrons, 8 pi+, 2 pi-, 3 mu+, 3 mu-– Large scintillator 2 (40 cm x 40 cm) at 9994 mm: 719 particles, 257

protons, 436 neutrons, 9 pi+, 2 pi-, 3 mu+, 3 mu-

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Simulations for beam testSimulations for beam test10m from target First scintillator

pn

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Simulations for beam testSimulations for beam test10m from target Absorber (1cm)

pn

Clearly, 1 cm thickness makes little difference.

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Simulations for beam testSimulations for beam test10m from target Second scintillator

pn

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Numbers Numbers

ISIS bunch is 2.5 1013 protons We might intercept 1% before being shutdown?

– 7.5 106 protons on 40cm2 detector– 4700 in a 3mm by 3 cm finger scintillator

Kenny:Scintillator 40cm sq. at 10m

288 protons11 pions

10M P-o-T

29 protons per 1M1.1 π

Bill:Scintillator 40cm sq. at 10m

55 protons6 (+14 mu,e)2.4M P-o-T

23 protons per 1M2.5 π (+6.5 μ, e)

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Simulations for beam testSimulations for beam test At high momenta (above ~ 800 MeV/c), protons and lighter particles

become indistinguishable. At high momenta it doesn’t help to use Time of Flight information

MICE Collaboration Meeting 22 October 2005

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Simulations for beam testSimulations for beam testProtons survival Pions survival

We can use range-out of protons to perform crude momentum separation Protons range out very quickly (e.g. in 5cm scint. proton energy > 425 MeV) Need to convolute survival probablilities with production to produce optimal

arrangement.

Thickness scintillator (cm) Thickness scintillator (cm)

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Equipment for beam testEquipment for beam test

FAN IN/OUT

FAN IN/OUT

Q-ADC TDC

GATE

TDC

GATE

Q-ADC

HIGH

VOLTAGE

PMT1 PMT2X

x

VME CRATE

L

Have electronics, PMTs and UNIDAQ data acquisition installed at Glasgow (thank you Makoto and Malcolm!!!!).

Aim to start testing PMTs next week.

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Proof!Proof!

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PlansPlans Prepare for target test January 2005 inside ISIS ring .

– Test station being set-up at Glasgow with UNIDAQ and read-out electronics: technical problems with DAQ resolved with Makoto and Malcolm’s help.

– Test all PMTs and validate performance– Purchase Bicron BC-404 scintillator, light-guides and absorbers for

precise geometry determined from simulation.– Electronics and PMT’s fully tested by end November 2005– Install equipment in ISIS during December-January (ISIS shutdown)– Set-up triggering electronics and gated scalers for target monitoring

In parallel, develop simulations to define optimal geometry– Calculate particle momenta coming out of target: done– Run test-beam simulation to determine what configuration results in the

maximum information that we can extract from target test (ie. ToF, dE/dx, optimum distance 10-20 m, use of different absorbers, …)

– Determine rate per scintillator slab for different configurations – Write proposal to ISIS: target November 2005