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HPS Beamline: Background Rates, Sensitivity to Field Uncertainties

HPS Beamline: Background Rates, Sensitivity to Field Uncertainties. Concrete Wall thickness Study Dose on Electronic Rack Beam Left Dose on ECAL Estimate Sensitivity to Field Uncertainties. HPS Setup. Pair Spect. Frasc . Magn . 1. Frasc . Magn . 2. 191.6cm. 1195.6cm.

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HPS Beamline: Background Rates, Sensitivity to Field Uncertainties

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

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

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

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

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

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

  7. 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 HPS Test Magnets Field Maps x (cm) Field (Gauss) Frascati Magnet Measurement Z (cm) HPS Collaboration Meeting, JLAB, May 2011

  8. 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% HPS Test Chicane Alignment 2.2 GeV Electron (cyan) Zoomed in HPS Collaboration Meeting, JLAB, May 2011

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

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

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

  13. 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 Beamline Wall Thickness Study 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 HPS Collaboration Meeting, JLAB, May 2011

  14. Doses in all EC HPS Beamline Wall Thickness Study 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… HPS Collaboration Meeting, JLAB, May 2011

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

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

  17. Fluences, Assuming all Energy is Deposited in the Electronic Rack HPS Electronic Rack Study 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. HPS Collaboration Meeting, JLAB, May 2011

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

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

  20. 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 ECAL Dose IC Calorimeter, eg1-dvcs ECAL, HPS Test 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 HPS Collaboration Meeting, JLAB, May 2011

  21. Field Knowledge Sensitivity HPS Collaboration Meeting, JLAB, May 2011

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

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

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