1. HPS Beamline: Background Rates, Sensitivity to Field Uncertainties M. Ungaro1HPS Collaboration Meeting, JLAB, May 2011 1.Concrete Wall thickness Study 2.Dose on Electronic Rack Beam Left 3.Dose on ECAL 4.Estimate Sensitivity to Field Uncertainties

2. HPS Setup Frasc. Magn. 1 Pair Spect Frasc. Magn. 2 M. Ungaro2HPS Collaboration Meeting, JLAB, May 2011

3. CLAS12 – CLAS6 – HPS Centers M. Ungaro3HPS Collaboration Meeting, JLAB, May 2011 191.6cm CLAS12 CLAS6CLAS12 HPS TEST 191.6cm 1195.6cm

4. CLAS12 – CLAS6 – HPS Centers M. Ungaro4HPS Collaboration Meeting, JLAB, May 2011 CLAS6CLAS12 HPS TEST 191.6cm 1195.6cm “CLAS6”

5. CLAS12 – CLAS6 – HPS Centers M. Ungaro5HPS Collaboration Meeting, JLAB, May 2011 1195.6cm “CLAS6” CLAS6CLAS12 HPS TEST 191.6cm 1195.6cm

6. CLAS12 – CLAS6 – HPS Centers M. Ungaro6HPS Collaboration Meeting, JLAB, May 2011 HPS CLAS6CLAS12 HPS TEST 191.6cm 1195.6cm

7. HPS Test Magnets Field Maps Provided by Stepan, CLAS Note 2011-2 Measurements of Frascati, PS Magnets Frascati Magnets Current for 0.25 Tm: 335.9 A (based on max field value) Pair Spectrometer Field: 0.5 T field Frascati Magnet Measurement Z (cm) x (cm) Field (Gauss) M. Ungaro7HPS Collaboration Meeting, JLAB, May 2011

8. HPS Test Chicane Alignment 2.2 GeV Electron (cyan) Zoomed in M. Ungaro8HPS Collaboration Meeting, JLAB, May 2011 2cm radius “bulls eye” tubes Located 10m and 20m from PS magnet 2.2 GeV electron (cyan) Red Dot = hit PS at 0.5T Frascati Magnet at 1/0.8316 Or 120.3%

9. HPS Test Beamline Flange Vacuum Flange at Exit of 2 nd Dipole 2 cm Stainless Steel. Heigth: 3.1’’ No Effect if we use Aluminum Holes Separation: 157.0 mm ID: 2’’ Kapton Window 100  m M. Ungaro9HPS Collaboration Meeting, JLAB, May 2011

10. HPS Test Beamline 150’’ Helium Bag D=2’’ 200’’ Steel Pipe ID = 2’’ OD = 3’’ Photon Absorber: 30cmx40cmx50xcm W M. Ungaro10HPS Collaboration Meeting, JLAB, May 2011

11. M. Ungaro11HPS Collaboration Meeting, JLAB, May 2011 HPS Beamline Wall Electronic Rack Lead Shields Concrete Wall (10cm)

12. M. Ungaro12HPS Collaboration Meeting, JLAB, May 2011 HPS Beamline Wall Electronic Rack Lead Shields Concrete Wall (50cm)

13. M. Ungaro13HPS Collaboration Meeting, JLAB, May 2011 HPS Beamline Wall Thickness Study Doses in all EC eg1 dvs ------ particle GeV/s GeV/(s cm2) nrad/s nrad/(scm2) rad/year pi- 1191 0.0280856 0.954882 2.25045e-05 0.0301131 e- 472301 11.1311 378.446 0.00891916 11.9347 gamma 2390098 56.3294 1915.14 0.0451358 60.3959 n 28118 0.662701 22.5312 0.000531011 0.710543 e+ 280506 6.61094 224.765 0.00529723 7.08819 pi+ 1536 0.0362203 1.23145 2.90227e-05 0.0388351 hps_test_shield WALL = 10cm ------ particle GeV/s GeV/(s cm2) nrad/s nrad/(scm2) rad/year pi- 340 0.00803177 0.273072 6.43571e-06 0.00861159 e- 634268 14.9483 508.228 0.0119778 16.0275 gamma 5006186 117.985 4011.37 0.0945392 126.502 n 19218 0.452949 15.3998 0.00036294 0.485648 e+ 337722 7.95938 270.611 0.00637771 8.53398 pi+ 271 0.00639646 0.217473 5.12537e-06 0.00685823

14. M. Ungaro14HPS Collaboration Meeting, JLAB, May 2011 HPS Beamline Wall Thickness Study Doses in all EC configuration GeV/s GeV/(s cm2) nrad/s nrad/(scm2) rad/year eg1_dvs 3180378 74.9546 2548.38 0.0600598 80.3657 WALL 10cm 6313807 148.803 5059.14 0.119233 159.545 WALL 20cm 6055976 142.726 4852.55 0.114364 153.03 WALL 30cm 6001375 141.439 4808.79 0.113333 151.65 WALL 40cm 5455224 128.568 4371.17 0.103019 137.849 WALL 50cm 5072764 119.554 4064.72 0.0957965 128.185 Getting Closer, but more work to do…

15. M. Ungaro15HPS Collaboration Meeting, JLAB, May 2011 HPS Electronic Rack Study Rates (MHz) 4meters x 4 meters Z at target X = 3meters

16. M. Ungaro16HPS Collaboration Meeting, JLAB, May 2011 HPS Electronic Rack Study Background Flux Density (normalized to 1) mm 4meters x 4 meters Z at target X = 3meters

17. M. Ungaro17HPS Collaboration Meeting, JLAB, May 2011 HPS Electronic Rack Study Fluences, Assuming all Energy is Deposited in the Electronic Rack hps_test_shield5 ------ particle GeV/s GeV/(s cm2) nrad/s nrad/(scm2) rad/year pi- 0 0 0 0 0 e- 67295 1.58601 53.9229 0.00127085 1.70051 gamma 328263 7.73646 263.032 0.00619909 8.29497 n 16788 0.395668 13.4523 0.000317042 0.424232 e+ 15980 0.376626 12.8049 0.000301784 0.403815 pi+ 0 0 0 0 0 TOTAL: 434570 10.2419 348.213 0.00820663 10.9813 RADIATION DAMAGE IN DETECTORS AND ELECTRONICS: Usually 5000 rad in minutes. We’re ok, even considering Neutron- equivalent damage for silicon chips. Vasilescu and G. Lindstroem, Displacement damage in silicon, on-line compilation. RADIATION DAMAGE IN DETECTORS AND ELECTRONICS Ronald Lipton, Fermilab, Batavia, IL 60510, U.S.A.

18. M. Ungaro18HPS Collaboration Meeting, JLAB, May 2011 ECAL Rates IC Calorimeter, eg1-dvcs ECAL, HPS Test

19. M. Ungaro19HPS Collaboration Meeting, JLAB, May 2011 ECAL Background Origin IC Calorimeter, eg1-dvcs ECAL, HPS Test Mostly from targetMostly Vac Box (scattered e-)

20. M. Ungaro20HPS Collaboration Meeting, JLAB, May 2011 ECAL Dose ECAL, HPS Test IC Calorimeter, eg1-dvcs eg1_dvcs ------ particle GeV/s GeV/(s cm2) nrad/s nrad/(scm2) rad/year pi- 103 0.139382 13.4819 0.0181305 0.425164 e- 18511 24.895 2408 3.2383 75.9386 gamma 375131 504.48 48796.5 65.6219 1538.85 n 4223 5.67924 549.331 0.738745 17.3237 e+ 15530 20.886 2020.23 2.71682 63.7098 pi+ 58 0.0787799 7.62008 0.0102476 0.240307 TOTAL 410876 552.55 53446 71.8747 1685.47 hps_test_shield5 ------ particle GeV/s GeV/(s cm2) nrad/s nrad/(scm2) rad/year pi- 0 0 0 0 0 e- 7473 10.0498 972.077 1.30726 30.6554 gamma 86754 116.668 11284.8 15.176 355.879 n 451 0.607414 58.7528 0.0790114 1.85283 e+ 5997 8.06546 780.141 1.04914 24.6025 pi+ 0 0 0 0 0 TOTAL 100813 135.575 13113.7 17.6354 413.553

21. M. Ungaro21HPS Collaboration Meeting, JLAB, May 2011 Field Knowledge Sensitivity

22. M. Ungaro22HPS Collaboration Meeting, JLAB, May 2011 Field Knowledge Sensitivity https://userweb.jlab.org/~ungaro/maureepage/proj/HPS/field_variations/field_variations.html Example: at ECAL entrance: Electron Beam: 1 mm/Frascati % Electron Beam: 0.6mm/PS % Photon Beam: 1.1mm/Frascati % Photon Beam: 0.1mm/PS%

23. M. Ungaro23HPS Collaboration Meeting, JLAB, May 2011 Summary 1.Background sources are identified 2.Increasing wall thickness from 10cm to 50cm only gives us 20-25% gain 3.More work to be done to optimize beamline 4.Radiation doses on EC is well below eg1-dvcs levels 5.Radiation damage to Electronic Racks is negligible 6.Electrons: ~0.5-1mm sensitivity / PS, Frascati% 7.Photons: ~0.1-1.1mm sensitivity / PS, Frascati%