Proposal for TESLA beam test zone at IHEP ( Protvino )

November 15-18, 2002 V. Obraztsov - Prague ECFA/DESY Workshop

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Proposalfor

TESLA beam test zoneat IHEP ( Protvino )

Vladimir Obraztsov Institute for High Energy Physics Protvino Moscow region, Russia


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Content 1. TESLA requirements 2. IHEP accelerator parameters 3. Beam line parameters 4. Beam tests for energy resolution 5. Beam tests for energy flow analysis 6. Test zone arrangement 7. Time schedule 8. DAQ 9. Conclusion


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TESLA requirements 1. Calorimetric response for individual particles ( to test options and tune the simulation )- beams: h,e,- momentum range: (1 - 50) GeV/c- different incident angles- statistics: 106 per point, ~102 points

2. JET separation (to test/tune energy flow reconstruction)- different combinations of e, h, , with an open angles 6 mrad


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IHEP accelerator parameters

- IHEP accelerator is 70 GeV proton synchrotron- cycle time - 10 s- spill time - 1.8 s- intensity ~ 11013 p/cycle- RF structure: bunch length – 40 ns, bunch spacing – 160 ns - beams are from extracted protons and internal targets


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- Beam line #2B from internal target is used- Negative beam- Momentum range (1-45) GeV/c

Beam line parametersElectron beam


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Beam resolution itself is not good enough to satisfy TESLA ECAL requirements


Energy,GeV

Beamresol.,

%

ECALresol.,

%1 4.3 11.02 5.5 7.85 5.6 4.9

10 3.8 3.527 1.2 2.145 1.0 1.6


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Beam tagging system (BTS) to improve resolution( BTeV PbWO4 coll., hep-ex/0208012 )



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- Beam tagging system allows to keep beam resolution ~10 times better than expected ECAL resolution- Beam spot, ~ 3 cm

Beam line parametersElectron beamEnergy,

GeVBeamresol.,

%

ECALresol.,

%

BTSresol.,

%1 4.3 11.0 2.052 5.5 7.8 1.035 5.6 4.9 0.43

10 3.8 3.5 0.2427 1.2 2.1 0.1545 1.0 1.6 0.13


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Admixtures of h- and - allow to measure calorimetric response simultaneously for e- , h- and - using Cherenkov counter

Beam line parametersElectron beamContentEnergy,

GeVIntensityin spill

on 1012 pot e , % , % h , %

1 4102 82 10 52 1103 77 15 85 2103 50 32 1810 5103 34 35 3027 4104 77 9 1345 2104 91 4 5

from PbWO4 array


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- Beam line #2B from internal target is used- Negative beam- Beam spot, ~ 2.5 cm

Beam line parametersHadron beam


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• Momentum range (33-45) GeV/c

• Beam composition

Beam line parametersHadron beam

Intensity for p/p = 1%

Energy,GeV

Intensityin spill

on 1012 pot33 1106

40 3106

55 2105

- 96.4 %- 1.0 %k- 2.3 %p- 0.3 %


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Beam tests for energy resolution

Particle type Electron beamrange, GeV/c

Hadron beamrange, GeV/c

e- 1- 45 -h- 1- 45 33 - 55- 1- 45 33 - 55


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Beam tests for energy resolutionSet up for energy resolution measurements

- Minimal incident angle, min~ 630, due to leakage.- Movable platform is needed for different incident angles. Different parts of set up should be adjusted too.


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Beam tests for energy flow analysis

- full TESLA sector from Si to catcher- in magnetic field- expected acceptance tgxz 0.07 tgyz 0.20-requires to reconsider ECAL,HCAL, ID lateral dimensions

Set up for EFLOW


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Magnet parameters

Parameter Value CommentAperture, cm2

Effective length, cmMagnetic field, Tm

75x150300

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-300 for TESLA12 for TESLA


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Possible measurements

- inelastic - N interactions at (40-55) GeV/c with at least 2 particles within the set up acceptance- - p 0 n, - p n reactions ( ~(10-3-10-4) of tot) to study the ECAL separation ,min = 2mm/Em


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, ± multiplicity in acceptance

± + ± mult2

~80% evts

-p at 55 GeV/c


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Pair angles in acceptance

-p at 55 GeV/c


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Arrangement

Item RemarkBeam lineBeam detector systeme-beam tagging systemExperimental houseMovable platform, supportsDAQ

existsexists

exists for BTeVexists

do not existtask for Collaboration


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Arrangement

S1S4 , A1 , A2 - scintillation counters PC1 , PC2 - proportional chambers H1 , H2 - scintillation hodoscopesC1 , C2 - threshold cherenkov countersD1 , D2 - differential cherenkov countersSTOF - time-of-flight scintillation counter

Beam detector system

/ beamSet up


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Possible time schedule

Item DatesOptimization of set upConstruction of nonexisting partsTest zone arrangementSet up assembly1-st run for energy resolution2-nd run for energy resolutionSet up reassembly1-st run for energy flow2-nd run for energy flow

Jan – Jun 2003Jul – Dec 2003Jan – Jun 2004Jul – Oct 2004Nov – Dec 2004, 120 hoursMar – Apr 2005,240 hoursMay – Oct 2005Nov – Dec 2005, 120 hoursMar – Apr 2006,240 hours


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DAQ

Item TESLA Beam testsMax trigger rate/BXExpected trigger rateDate taking time (bufferization)Data read out time (sequental)Triggers per hour

282028201 ms

200 ms-

4095= 12 bits~ 1000~ 2 s~ 8 s

~ 3.6105


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Conclusion 1. IHEP is ideal site for TESLA beam tests.

All tests can be done in one beam line 2. Energy resolution tests with beam particles

e- : (1-45) GeV/ch- : (1-55) GeV/c- : (1-55) GeV/c

3. Energy flow tests with additional targetSector of full Tesla detector can be tested

4. Beam time will be IHEP contribution for Tesla R&D

Documents

Proposal for TESLA beam test zone at IHEP ( Protvino )