f. negoita, [email protected] bucuresti, 28 feb. 2006 participation of nipne-bucharest in...

IFIN-HH

F. Negoita, [email protected] Bucuresti, 28 Feb. 2006

Participation of NIPNE-Bucharestin SPIRAL2 Project

IFIN-HH


I. A system for Beam Losses Measurements (BLM) based on neutron and gamma detection

II. Estimation of secondary beams intensities obtained using fusion-evaporation reactions induced by high intensity heavy-ion primary beams

III. Development of 1+ ion-source

IV. Secondary beam lines

V. Physics and instrumentation for physics

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Why?➢ to avoid quenching of superconducting cavities➢ to maintain prompt radiation level bellow given limits➢ to diminish activation and protect accelerator components➢ to help tunning/optimizing the beam

It must provide: - the intensities of beam losses - the positions where the losses occur - a fast signal if the limit(s) is(are) overpassed

The limits are: - at ion-source, LEBT, RFQ, MEBT: several % - 1 W /m (or per cavity) along LINAC - at HEBT: ?

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Ion source: d+d reaction (reaction on deuterons previously implanted) (+LEBT) produces ~2MeV neutrons

Ed < ~5 MeV: d+d reactions rather improbable

(RFQ, MEBT, reactions on Cu, Nb, Fe below threshold first cavities) (low Z elements, e.g. Li ?)

Higher energies:

Double differentialneutron yieldon C, Cu and Pbat 33 MeV deuteron incident energy from PRC29(1984)1307

Total neutron yield on Be and Cu [NIM 96(1971)581]

Gamma and neutron generationby beam losses

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CountingRates

Simulationare based on:- exp. data d (33 MeV) on Cu;- dimension of detector 1x1x1 cm3- threshold on generated light in det.: 100 eeKeV

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AbsorbedDoses

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Up-down ratio of counting rates transversal information on beam losses

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Efficiencies and background

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Efficiencies andradiation hardness

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X-ray background

20 µSv/h

20 µSv/h

140 µSv/h

50 µSv/h

1760 µSv/h

780 µSv/h

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BLM - options

1. Ion-source: neutrons for d+d reactions measured by 3He-counters

2. HEBT: if higher losses are allowed, then gas detectors

3. Linac: a) a chain of plastic scintillators placed one each meter (sc-cavity), parallel with Linac at about 1.5 m from beam line can give: - resolution in position of loss at level of 0.5 m - counting rates of 5x103 at 33 MeV, 1 W (for 103 cm3 detection volume) - direct relation to extract intensity of losses b) A chain at 0.3 m from beam line, one detector near each sc-cavity and each diagnostic box: - counting rates 25 larger - better resolution in position - intensity of loss is deduced from counting rates of several (3) detectors

Main problems are at the level RFQ and first cavities of LINAC

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Important question for establishing the size detectors (counting rates):

How much fast the response have to be ?

If counting rates is 104/s for 1 W 10 counts / millisecond => o standard deviation = 3 counts / msSo, if we have to put the threshold at 6 standard deviations (30 counts/ms) then response time is ~millisecond for losses > 3 W

For a loss of ~ 1.6 W response time is ~ 10 ms.

For a loss of ~ 1.06 W response time is ~ 1000 ms

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Phase Task People Start End Needs Person-months

Design

n- production/attenuationsimulations

F.N.M. Preda

2004-Q2 2007

Experimental validation all 2006 2007

Detector efficiency simulation A. ButaS. Iacob

2006 2007

Test(prototypes) detectorsconstruction and testing;radiation hardness tests

all 2005 2007_Q4 Collab. with SOREQ

Electronic design M.Petcu,H. Petrascu, +?

2006 2007 Work to be done togetherwith GANIL experts

Mechanical design: detectors,fibers, cables, supports

G.Dumitru+?

2007_Q1 2007_Q4 Work to be done togetherwith GANIL experts

Realization

Detector production (buying) I. Cruceru, ... 2008_Q1 2009_Q1

Detector testing/calibration A.B.,.... 2008_Q2 2009_Q1

Electronics buying (production) M.P., H.P.,.... 2008 2009

Electronics testing “ 2008 2009

Software development:acquisition, processing,graphical presentation

S.I., M.D. +? 2007 2009 Work to be done togetherwith GANIL experts

Installation on site all

Calibration with beam all

γ

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II. Estimation of secondary beams intensities obtained using fusion-evaporation reactions

Existent codes: 1. Fusion-evaporation codes using Monte Carlo method (PACE, LILITA): - can give cross sections and energy-angle distributions - time consuming (especially for exotic nuclei) 2. Fusion-evaporation codes using calculation of population of spin-excit.energy matrix - can give cross section but not distributions 3. Monte Carlo made by L.Penescu to determine in target production at efficiency of stopper

Sortiefaisceau

radioactif

Stoppeurrésidu

Is= N

cible I

Intensity of secondary beam:

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Proposal: To link the codes such as from a minimal input: - projectile: A, Z (and incident position distribution) - target: A, Z, density (and melting point) - residual nucleus of interest: A, Z - entrance window, stopper: A, Z, density

to get: i) excitation function and therefrom the incident energy, target thickness (and maxim current) then input the geometry, call fus.-evap. MC-codes, pass distributions to MC-codes of L.Penescu and get: ii) percentage of nuclei stopped in target, window and stopper

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Part of the IRENA ion-source under development at IPN-Orsay

NIPNE-Bucharest contribution within T4 /EURISOL:● design and realize two new version:

i) with a thiner cathode and ii) with an oxidate cathode and other improuvement to reduce the displacement due to dilation

● participation in tests at IPN-Orsay

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Proposal: * participation in design, construction and tests of the the version of IRENA ion-source adapted for SPIRAL2

* possible participation in development in ECR 1+ ion-source for secondary beams

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Ing. Gheorghe Mateescu presents the experience of NIPNE withRomanian fabricants of equipments for beam lines (mechanical components, electromagnetic elements, etc.)

A list of fabricant and components produced in Romania can be provided to SPIRAL2 management to be considered when the invitations to tender will be launched.

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II. Estimation of secondary beams intensities obtained using fusion-evaporation reactions induced by high intensity heavy-ion primary beams




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gamma-CE spectroscopy in beam (AGATA), in beta-decay, isomersreaction studies: break-upneutron detection: beta-delay neutron spectroscopy, reaction studies


Nuclear Structure

Nuclear astrophysics

Nuclear interaction and hadronic matter INDRA, FAZIA

Nuclear Data ?

f. negoita, [email protected] bucuresti, 28 feb. 2006 participation of nipne-bucharest in...

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