1. 12/7/2018
Irradiation plan
Victor Rykalin
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
12/7/2018
Victor Rykalin

3. Some basics WHILE BEING IRRADIATED
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 %).
12/7/2018
Victor Rykalin

4. M. Kobayashi (KEK) 17 November, 2003
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
12/7/2018
Victor Rykalin

5. Recovery
12/7/2018
Victor Rykalin

6. ZEUS experience 12/7/2018 Victor Rykalin 23 %
ZEUS NOTE April 3,1998
23 %
12/7/2018
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)
12/7/2018
Victor Rykalin

8. Irradiation facilities
FERMILAB. Protons 7 Gev (1012 p/cm2 sec, painful bureaucracy) fee - nervous system.
INDIANA cyclotron 200 Mev ( 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
12/7/2018
Victor Rykalin

9. INDIANA Proton Capabilities of the RERS
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 Facility Milo B, Sampson Ln Bloomington, IN 47408
PHONE #: (812) FAX #: (812)
For additional information, Barbara Przewoski
12/7/2018
Victor Rykalin

10. MICHIGAN Co 60 facility will be open untill July 2004 !
Ford Nuclear Reactor to Shutdown
To:
Subject: Ford Nuclear Reactor to Shutdown
From: "Christopher W. Becker"
Date: Wed, 28 May :12:
Reply-To: "Christopher W. Becker"
Sender:
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
Phone:
Fax:
Pager:
Text Paging:
Co 60 facility will be open untill July 2004 !
12/7/2018
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
12/7/2018
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 ? ~$ travel (IUCF), ~$200 + shipping and receiving (UMICH)
12/7/2018
Victor Rykalin

13. 100*5 mm^2 scintillator 1. 2. 3. 4. Cells measurements 12/7/2018
Fluorescence measurements
Light output measurements and selection of the scintillator for the cell fabrication
Cells production
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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.
12/7/2018
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
Krad
12/7/2018
Victor Rykalin