1. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 1 Proposal for TESLA beam test zone at IHEP ( Protvino ) Vladimir Obraztsov Institute for High Energy Physics Protvino Moscow region, Russia

2. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 2 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

3. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 3 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: 10 6 per point, ~10 2 points 2. JET separation (to test/tune energy flow reconstruction) - different combinations of e, h, ,  with an open angles  6 mrad

4. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 4 IHEP accelerator parameters - IHEP accelerator is 70 GeV proton synchrotron - cycle time - 10 s - spill time - 1.8 s - intensity ~ 1  10 13 p/cycle - RF structure: bunch length – 40 ns, bunch spacing – 160 ns - beams are from extracted protons and internal targets

5. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 5 - Beam line #2B from internal target is used - Negative beam - Momentum range (1-45) GeV/c Beam line parameters Electron beam

6. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 6 Beam resolution itself is not good enough to satisfy TESLA ECAL requirements Beam line parameters Electron beam

7. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 7 Beam tagging system (BTS) to improve resolution ( BTeV PbWO4 coll., hep-ex/0208012 ) Beam line parameters Electron beam

8. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 8 - Beam tagging system allows to keep beam resolution ~10 times better than expected ECAL resolution - Beam spot,  ~ 3 cm Beam line parameters Electron beam

9. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 9 Admixtures of h - and  - allow to measure calorimetric response simultaneously for e -, h - and  - using Cherenkov counter Beam line parameters Electron beam from PbWO4 array

10. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 10 - Beam line #2B from internal target is used - Negative beam - Beam spot,  ~ 2.5 cm Beam line parameters Hadron beam

11. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 11 Momentum range (33-45) GeV/c Beam composition Beam line parameters Hadron beam Intensity for  p/p =  1%

12. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 12 Beam tests for energy resolution

13. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 13 Beam tests for energy resolution Set up for energy resolution measurements - Minimal incident angle,  min ~ 63 0, due to leakage. - Movable platform is needed for different incident angles. Different parts of set up should be adjusted too.

14. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 14 Beam tests for energy flow analysis - full TESLA sector from Si to  catcher - in magnetic field - expected acceptance  tg  xz   0.07  tg  yz   0.20 -requires to reconsider ECAL,HCAL,  ID lateral dimensions Set up for EFLOW

15. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 15 Beam tests for energy flow analysis Magnet parameters

16. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 16 Beam tests for energy flow analysis 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 = 2m m /E m

17. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 17 Beam tests for energy flow analysis ,  ± multiplicity in acceptance  ±± + ±+ ± mult  2 ~80% evts  - p at 55 GeV/c

18. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 18 Beam tests for energy flow analysis Pair angles in acceptance   - p at 55 GeV/c

19. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 19 Arrangement

20. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 20 Arrangement S 1  S 4, A 1, A 2 - scintillation counters PC 1, PC 2 - proportional chambers H 1, H 2 - scintillation hodoscopes C 1, C 2 - threshold cherenkov counters D 1, D 2 - differential cherenkov counters S TOF - time-of-flight scintillation counter Beam detector system / beam Set up

21. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 21 Possible time schedule

22. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 22 DAQ

23. November 15-18, 2002V. Obraztsov - Prague ECFA/DESY Workshop 23 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/c h - : (1-55) GeV/c  - : (1-55) GeV/c 3. Energy flow tests with additional target Sector of full Tesla detector can be tested 4. Beam time will be IHEP contribution for Tesla R&D