Frankfurt Neutron Source - FRANZ

Transkript

1 UCANS-1 Workshop 2010 Tsinghua University, Beijing Frankfurt Neutron Source - FRANZ Status und Perspective on behalf of the FRANZ community Oliver Meusel

2 Overview

3 Overview dc extraction & transport I b ~ 200 ma Proton Beam cw operation I b ~ 3-30 ma pulsed operation, rep. rate 250 khz, t = 1ns <I b > ~ 2 ma Activation Mode Neutrons: n / cm 2 s Compressor Mode Neutrons: 10 7 n / cm 2 l=0.8m Accelerator Physics Target Development Neutron Physics

4 Ion Source Development & Design I p = 200 ma W = 120 kev P = 24 kw rms,norm = 0.07 mm mrad dc-operation Extraction System Plasma Generator mechanical design of the proton source K. Volk, W. Schweizer, R. Nörenberg

5 Plasma Generator & Extraction System Experiments lifetime of the filament reliability of the source sparking power deposition in the extractor plasma vs. beam properties hot filament driven gas discharge

6 Impact of Plasma Properties W b = 25 kev I full = 60 ma I p = 200 ma N = 1, s -1 stady state assumption cold plasma: T i ~ 0,5 ev & T e ~ 5 ev small rms-emittance production of protons via secondary reaction H 2 * + e p + H + 2e

7 LEBT - 3 Sections - 4 Lenses dc extraction & transport W b,max = 120 kev I b,max = 200 ma pulsed beam operation t pulse = 100 ns rep. rate = 250 khz Tomography

8 E x B - Chopper Dumped Beam By = -300 mt By = -60 mt Solenoid 3 Septum Magnet DC Beam ExB Chopper Solenoid 2

9 Pulser and Electric Deflector 18 kev He-Beam Slit t pulse = 100 ns rep. rate = 250 khz Optical Diagnostics of Beam Deflection Measurements

10 Emittance Growth due to Lens Abberations Ion Source Chopper RFQ x / mm z / mm density distribution of transverse momentum v t,px y v t, px ni rms, y x dy

11 Beam Diagnostics Spectrometer Absorber CCD RGI optical profiles potential distribution n i r

12 Radio Frequency Quadrupole - RFQ Max. Proton Current Exp. Power Consumption RFQ RFQ Acceptance (norm. rms) 200 ma 150 kw 0.5 mm mrad

13 IH - Cavity Max. Proton Current Exp. Power Consumption IH IH (out, norm. rms) 200 ma 54 kw 0.95 mm mrad

14 Coupled RFQ-IH Cavities E x E y E z H x H y H z

15 CH - Rebuncher Cavity

16 Towards Compression Ratio of = 48 Homogenous Dipoles Gradient Dipoles L. P. Chau Rebuncher 9 Bunches 5 MHz Kicker Single 1ns Pulse at Li-Target

17 Design Study of Multi Track Devices Duplex Gradient Dipole Syrinx Rebuncher

18 High Power Target H 3Li 4Be 0n 1, 646 MeV E p = 2 ± 0.2 MeV D. Petrich, F. Käppeler r = 10 mm E n Threshold: MeV Target prototype development at Karlsruhe for beam power up to 6 kw. Neutron yield and maximum neutron energy in forward direction (0 ).

19 Neutron Dynamics examples for Mollweide projection World 2,725 ± 0,002 K Neutron Distribution

20 Neutron Dynamics examples for Mollweide projection World 2,725 ± 0,002 K Neutron Distribution Neutron energy distribution as a function of E p

21 Experiments neutron caption reaction HPGe detector integrated neutron spectrum [arb. units] measurement simulation N17 Simulation Lead shield measurement of neutron induced activity neutron energy [kev]

22 Compressor Mode Measurement of differential cross sections of small amounts of (radioactive) samples (advanced fuel cycle, astrophysics) Determination of properties of resonances (spins and parities) Study of -decay - photon strength functions R. Reifarth I [a.u] Prompt Flash 80 cm flight path E n = kev (n, ) on sample Other Reactions E n =200 kev Time of Flight Method E n =128 kev TOF [ns] 4 BaF 2 - detector after transfer from Karlsruhe to Frankfurt.

23 Shielding floor plan of FRANZ within the concrete shielding

24 Thank You! H. Podlech, U. Ratzinger, A. Schempp, + 18, + 2 / IAP, Goethe Universität Frankfurt M. Heil, R. Plag, R. Reifarth / GSI, Darmstadt K. Stiebing, J. Stroth / IKF, Goethe Universität Frankfurt F. Käppeler, D. Petrich / IKF, FZ Karlsruhe LINAC-AG AG-Schempp NNP-AG KIT / GSI / IAEO