High Energy Neutron and Proton High Energy Neutron ... - CERN Indico

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Ti i ti t 4h. /. / ti l t. – Trimming time up to 4 hours/energy/particle type. • 20% discount for irradiation campai
High Energy Neutron and Proton Irradiation Facilities at TSL

Alexander Prokofiev, 2007-11-30, 6th LHC Radiation Workshop

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Contents F ilit Facility

St t Status

Broad-beam proton irradiation

Steady operation

Quasi monoenergetic Quasi-monoenergetic neutrons

Steady operation, recently upgraded

White neutron beam (“ANITA”) Recently installed and characterized

Alexander Prokofiev, 2007-11-30, 6th LHC Radiation Workshop

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TSL overview The Gustaf Werner cyclotron Radionuclide production facility

Proton P t andd neutron t irradiation facilities

Narrow-beam and broad-beam proton treatment facilities Heavy-ion beam irradiation facility

Alexander Prokofiev, 2007-11-30, 6th LHC Radiation Workshop

Light-ion beam i di i facility irradiation f ili 3

Broad proton beam facility • Tantalum T t l scatterer tt • Collimation • Protons in air • Ep = 20 – 175 MeV • 7 – 20 cm diameter beam • Inhomogeneity not more than 10% • Flux: 102 … 1010 protons/cm2 (dep on Ep)

Alexander Prokofiev, 2007-11-30, 6th LHC Radiation Workshop

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Monoenergetic neutron beam • Neutron production: 7Li(p,n) Li(p n) , enriched to 99 99.99%, 99% 1 1-24 24 mm thick • Peak neutron energy: 11-174 MeV • Characterized neutron fields: 11*, 22, 47, 94, 143, 174* MeV • Peak P k neutron t flux: fl 1 104 - 5·10 1·10 5 105 neutron/(cm t /( 2/s) / ) • Area available for users at the beam line: 15 m long, 3 m wide • Flexible size and shape of the neutron beam spot: • Size: 0-30 cm diameter close to target (~3 m from Li), Up to 1 m diameter at larger distances from the target • Shape: p circular,, square, q , any y other shape p upon p request q • Beam spot uniformity: 0.5% • No concern about residual radioactivity • User User’s s control of the neutron flux: • Flux decrease up to a factor 1000 • User can turn the beam on/off any time * Data under processing Alexander Prokofiev, 2007-11-30, 6th LHC Radiation Workshop

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Neutron beam collimation Collimation in air Q i k manuall change Quick h Any shape possible

Horizontal beam profile Dashed lines: expected boundaries 1.4

R e la tiv e C o u n t R a te

1.2 10 1.0 0.8 0.6 0.4 0.2 00.00 -20 -15 -10 -5

0

5

10 15 20

Distance from the beam line axis (cm)

Alexander Prokofiev, 2007-11-30, 6th LHC Radiation Workshop

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Neutron monitors (1) Ionization chamber (2) Thinfilm fil breakdown counter (3) Proton beam currentt Monitors (1) and (2) are based on the fission of 238U. Alexander Prokofiev, 2007-11-30, 6th LHC Radiation Workshop

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Neutron spectrum p characterization Protons from H(n,p), MEDLEY setup Peak neutron energy (MeV)

Neutron spectrum status

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Preliminary/ unpublished bli h d

22, 47, 95, 143

Published

174

Measured, to be Measured processed

Alexander Prokofiev, 2007-11-30, 6th LHC Radiation Workshop

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Neutron spectra at 0º Experimental data: Blue symbols Model calculations: Dashed red lines

b

46.5 MeV

0.20

Relaative Specctral Fluennce (1/M eV V)

Neutron facility spectra

a

21.8 MeV

0.25

0.15 0.10 0 05 0.05

0

10

20

0 c

94.7 MeV

10

20

30

142.7 MeV

40

50 d

0.15

0.10

0.05

0

20

40

60

80 100

0

50

100

Neutron Energy (MeV) Alexander Prokofiev, 2007-11-30, 6th LHC Radiation Workshop

150

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White neutron beam ANITA (Atmospheric-like Neutrons from thIck Target) 180 MeV proton beam on a full-stop tungsten target

• First run: 2007 • Conclusion: IT WORKS Alexander Prokofiev, 2007-11-30, 6th LHC Radiation Workshop

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White beam status • •



Neutron flux: ~106 cm-2 s-1 * Gamma-ray dose rate: – With beam on: ≤60 mSv/h* – With beam off: ≤10 µSv/h** µSv/h Preliminary results are available for the ANITA neutron spectrum measured with Medley.

* At collimator exit, proton current 200 nA, for neutrons above 10 MeV. ** Production target in parking position.

Alexander Prokofiev, 2007-11-30, 6th LHC Radiation Workshop

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White beam usefulness • •

• • • • • • •

The neutron flux is suitable for SER testing. Controllable variation of the flux according to user’s needs is quick & easy. The available range of variation covers any thinkable needs. The size of the neutron beam spot can be chosen by the user (anything from 1 cm up to 2 m) and can be quickly adjusted. The gamma dose rate in-beam in beam is relatively low and not expected to pose problems for SER-testing. The testing area is spacy and suitable for bulky objects. The residual radioactivity of DUTs is expected to be well below allowed limits for handling and transportation. The testing area is available shortly after the irradiation. The ambient dose rates are below allowed limits for personnel personnel. TSL/ANITA is a potential European alternative to LANSCE. Users from CERN are most welcome!

Alexander Prokofiev, 2007-11-30, 6th LHC Radiation Workshop

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Beam Time Schedule – Autumn 2007

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Beam Time Schedule – 1st half of 2008

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Pricing, scheduling, contact •

• • •

400 Euro/hour* are charged for: – User’s time – Trimming Ti i titime up tto 4 h hours/energy/particle / / ti l type t 20% discount for irradiation campaigns of 1 week or longer No minimum irradiation time N costt ffor set-up No t ti time att th the iirradiation di ti area and d att the th counting ti rooms Information on TSL, including beam-time request:www.tsl.uu.se Laboratory director: [email protected] Curt Ekstrom@tsl uu se Coordinator of irradiation facilities: [email protected] Scientific programs: [email protected] Request January 15 April 15 July 15 October 15

Scheduling April-June August-October November-December January-March

* Valid until 2007-12-31 Alexander Prokofiev, 2007-11-30, 6th LHC Radiation Workshop

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