Irradiation plan

transcript

Irradiation plan

Victor Rykalin

04/22/23 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

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 IRRADIATED1.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 %).

M. Kobayashi (KEK)17 November, 2003

Basics on effect of radiation

V.I. Rykalin et al. Radiation damage in polystyrene based scintillator Preprint IHEP Protvino 1991 - 187

Recovery

ZEUS experienceZEUS NOTE 98-026 April 3,1998

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)

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

INDIANA

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

http://www.iucf.indiana.edu/RERP/rerp/cap.shtml

MICHIGAN

Ford Nuclear Reactor to ShutdownTo: 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

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 ManagerT h e U n i v e r s i t y o f M i c h i g a nPhoenix Memorial Laboratory - Ford Nuclear Reactor2301 Bonisteel BoulevardAnn Arbor, Michigan 48109-2100Phone: 734.764.6224Fax: 734.936.1571Pager: 734.670.7210

Text Paging: 7346707210@airtouchpaging.com

Co 60 facility will be open untill July 2004 !

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

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)

100*5 mm^2 scintillator

• 1.

• 2.

• 3.

• 4. Cells measurements

Light output measurements and selection of the scintillator for the cell fabrication

Fluorescence measurements

Cells production

10 pieces, one edge open and polished,

NICADD painted cells.

10 pieces, 19*19 mm^2

10 NICADD painted pieces + sigma grooved fiber.

2-3 MRS for 1 Mrad only.

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

Irradiation plan

Documents