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Irradiation plan

Irradiation plan. Victor Rykalin. Content. A bit more than introduction What do we expect from the irradiation studies ? What do we want to test? Irradiation facilities Time. Dose. Money. Summary. Some basics. First dopant, PPO (s. absorption = s. luminescence) .

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Irradiation plan

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  1. Irradiation plan Victor Rykalin

  2. Content • A bit more than introduction • What do we expect from the irradiation studies ? • What do we want to test? • Irradiation facilities • Time. Dose. Money. • Summary Victor Rykalin

  3. Some basics First dopant, PPO (s. absorption = s. luminescence) Second dopant, POPOP (s. absorption = s. luminescence of PPO, s.luminescence with longer wavelength than of PPO) , high conversion quantum efficiency, high thermal and photo resistance. WHILE BEING IRRADIATED 1.Complex process of degradation with active radicals appearance and output of the gas from polymer and from the dopants. 2. Two parameters degrade as a result: a. light output b. transmittance 3. Impact of thickness and measurements conditions ( air, Temperature, exposition time. 4. Light output recovery versus time (10-20 %). Victor Rykalin

  4. Basics on effect of radiation M. Kobayashi (KEK)17 November, 2003 V.I. Rykalin et al. Radiation damage in polystyrene based scintillator Preprint IHEP Protvino 1991 - 187 Victor Rykalin

  5. Recovery Victor Rykalin

  6. ZEUS experience ZEUS NOTE 98-026 April 3,1998 23 % Victor Rykalin

  7. What do we expect from the irradiation studies ? • We have to measure the light output of the extruded scintillator(bulk) and DHCAL cells (without fiber, with fiber) before and after irradiation, the same for the absorption and transmission spectra. • MRS irradiation (possible). • We have to persuade ourselves that 10 years of scintillator based DHCAL operation at LC is not a problem (total dose ?) • To have an information about radiation resistance of the extruded scintillator for the perspective customers (DHCAL, MINERVA, ALICE ….) • Publication (TN) Victor Rykalin

  8. Irradiation facilities • FERMILAB. Protons 7 Gev (1012 p/cm2 sec, painful bureaucracy) fee - nervous system. • INDIANA cyclotron 200 Mev (109 -1011 p/cm2 sec, plug and play, wide spot) fee - $ 500/hour • MICHIGAN. Co60 1 Mrad/hour, ~ $100/hour • KANSAS, ANL, OTHERS (no experience) • My preference(if protons) -------------> INDIANA (if gamma)-------------------------------->MICHIGAN Victor Rykalin

  9. INDIANA http://www.iucf.indiana.edu/RERP/rerp/cap.shtml • Proton Capabilities of the RERS • Energy range: 30 to 200 MeV • Lower energies readily available via degraders. Momentum analyzed beams with a small spread are available at 50, 70, 100, and 150 Mev. • Flux: 1E2 to > 1E11 p's/sec cm2 • Routine 1E5 to 1E11 p's/sec cm2 (SEM for dosimetry). • From 1E2 to 1E6 p's/sec cm2 (scintillator for dosimetry). • Areas: Less than 2 cm to 40 cm diameter. • Uniformity: < 30% variation over area. • Absolute Dosimetry: Better than 10% routinely. • Exposure Durations: A few seconds upward routinely available. • RERP, Indiana University Cyclotrotron Facility2401 Milo B, Sampson LnBloomington, IN 47408 • PHONE #: (812) 855-2913FAX #: (812) 855-6645 • For additional information, email Barbara Przewoskiprzewoski@iucf.indiana.edu Victor Rykalin

  10. MICHIGAN • Ford Nuclear Reactor to Shutdown • To: trtr@wpi.edu, radsafe@list.vanderbilt.edu • Subject: Ford Nuclear Reactor to Shutdown • From: "Christopher W. Becker" <cwbecker@UMICH.EDU> • Date: Wed, 28 May 2003 15:12:59 -0400 • Reply-To: "Christopher W. Becker" <cwbecker@UMICH.EDU> • Sender: owner-radsafe@list.vanderbilt.edu • All, • The Ford Nuclear Reactor is scheduled to complete nearly 45 years of • service on 3 July 2003 at 3:30 p.m. EDT. • Please, no responses. • Respectfully, • Christopher W. Becker, Reactor - Laboratory Manager • T h e U n i v e r s i t y o f M i c h i g a n • Phoenix Memorial Laboratory - Ford Nuclear Reactor • 2301 Bonisteel Boulevard • Ann Arbor, Michigan 48109-2100 • Phone: 734.764.6224 • Fax: 734.936.1571 • Pager: 734.670.7210 • Text Paging: 7346707210@airtouchpaging.com Co 60 facility will be open untill July 2004 ! Victor Rykalin

  11. Time. Dose. Money. • Optimum dose to accumulate ~ 1 Mrad. ??? (ask me) • Time estimation: 1 Gy= 100 rad 1Gy ~ 3.5*10E(9) / cm^2, MIP in carbon. For 200 Mev protons we have ~ 1.4*10E(9) protons. Then 1 Mrad = 10 E(4) Gy -------------> 1.4*10(13) protons/cm^ 2. Then for 200 Mev and for the 10 cm beam spot we have flux 1*10E(9)p/cm^2*sec , so we have to stay on the beam 1.4*10000 sec ~ 4 hours • 4 hours *$ 500 = $ 2000 1 SET Victor Rykalin

  12. Summary • Where? At Indiana, IUCF or at Michigan • What? Cells and scintillator bulk. MRS ? • Who? Me and Dmitry?(IUCF) • How ? Without problems • How much ? ~$2000 + travel (IUCF), ~$200 + shipping and receiving (UMICH) Victor Rykalin

  13. 100*5 mm^2 scintillator • 1. • 2. • 3. • 4. Cells measurements Fluorescence measurements Light output measurements and selection of the scintillator for the cell fabrication Cells production Victor Rykalin

  14. 10 pieces, 19*19 mm^2 1 2 10 pieces, one edge open and polished, NICADD painted cells. 3 10 NICADD painted pieces + sigma grooved fiber. 4 2-3 MRS for 1 Mrad only. Victor Rykalin

  15. To do list (30 days after irradiation, some measurements during recovery period) • 1. Unwrapped square, light output (Ru 106), Fluorescence before and after 500 Krad, 1 Mrad(FNAL). • 2. Painted , one end opened, Sr 90 , 500Krad and 1Mrad, NICADD • 3. Cells + fiber , Sr 90, 500 and 1 Mrad, NICADD • 4. Noise counts at different temperature, Number of PE with the same input signal (LED), NICADD( KEEP track of all parameters as HUM, Temperature etc) 500 Krad 1000 Krad Victor Rykalin

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