An Electron Linac Photo-Fission Driver for the Rare Isotope Program at TRIUMF
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1 CANADA S NATIONAL LABORATORY FOR PARTICLE AND NUCLEAR PHYSICS Owned and operated as a joint venture by a consortium of Canadian universities via a contribution through the National Research Council Canada An Electron Linac Photo-Fission Driver for the Rare Isotope Program at TRIUMF I. Bylinskii, F. Ames, R. Baartman, P. G. Bricault, Y.-C. Chao, S. Dechoudhury, K. Fong, S. R. Koscielniak, R. E. Laxdal, M. Marchetto, L.Merminga, A. K. Mitra, I. Sekachev, V. A. Verzilov LABORATOIRE NATIONAL CANADIEN POUR LA RECHERCHE EN PHYSIQUE NUCLÉAIRE ET EN PHYSIQUE DES PARTICULES Propriété d un consortium d universités canadiennes, géré en co-entreprise à partir d une contribution administrée par le Conseil national de recherches Canada
2 Outline Introduction Baseline design Beam dynamics study Schedule Summary E-Linac Photo-Fission Driver for RIB at TRIUMF 2
3 E-Linac Motivation/Impact New Science: Nuclear physics with neutron-rich RIBs Clean radioisotope beams Complementary & independent RIB driver Enhanced science output: multiple beams to multiple users Steady RIB production: staggered E-Linac & cyclotron shutdowns Leverages valuable existing infrastructure: Proton Hall: available shielded vault with services World-class RIB multiple experimental stations Expands SCRF in-house expertise Prepares Canada for SCRF projects world-wide (ILC, CERN-SPL) Qualifies commercial partner (PAVAC) to build SCRF cavities. E-Linac Photo-Fission Driver for RIB at TRIUMF 3
4 What is photo fission? Electron γ-ray beam photons Tungsten converter target Uranium oxide production target Radioactive ions Production efficiency: one γ-photon for three electrons (30 MeV) Photo-fission cross-section high for 15 MeV γ due to Giant Dipole Resonance E-Linac Photo-Fission Driver for RIB at TRIUMF 4
5 TRIUMF 5-year plan: ARIEL project new isotope production facility for ISAC expansion E-Linac Photo-Fission Driver for RIB at TRIUMF 5
6 Practical considerations (beam diagnostics) motivate bunch rep rate E-Linac Beam Specification Bunch charge (pc) 16 Bunch repetition rate (GHz) 0.65 Radio frequency (GHz) 1.3 Average current (ma) 10 Kinetic energy (MeV) 50 Beam power (MW) 0.5 Duty Factor 100% The requirement: 50 MeV 10 ma = ½ MW beam power Bunch vital statistics inject eject Normalized emittance (μm) <30π <100π Longitudinal emittance (ev.ns) <20π <40π Bunch length (FW), inject (ps) <170 <30 Energy spread (FW) <1 kev <1% Not critical; beam dumped on target E-Linac Photo-Fission Driver for RIB at TRIUMF 6
7 HP RF building block for e-linac 50 kw coupler 130 kw klystron 50 kw coupler E-linac RF unit = 100 kw/cavity E-Linac Photo-Fission Driver for RIB at TRIUMF 7
8 E-linac layout Gun: 100 kev; 650 MHz Injector: Solenoids 10 MV/m, Q= ma, 5-10 MeV gain 100 kw beam power Buncher Capture Cavities Solenoid Main linac: Two cryomodules Two cavities/module, 10 MV/m, Q= ma, 40 MeV gain 400 kw beam power 9-cell Cavities Division into injector & main linacs allows: Possible expansion for: Energy Recovery Linac (ERL) e.g. 10 ma, 80 MeV Recirculating Linear Accelerator (RLA) e.g. 2 ma, 160 MeV E-Linac Photo-Fission Driver for RIB at TRIUMF 8
9 Beam dynamics: 100 kv - 50 MeV low charge (16pC) elinac for ARIEL rms normalized emittance (cm mrad) xp vs. x yp vs. y element 23 Zpos= ngood= y vs. x e-es vs. phi-phis es= ps= z= Curves represent results of capture section optimization Beam portraits at the linac exit Energy spread (3 rms): 0.32% Bunch length (3 rms): 6.4 ps Beam dynamics posters: Thursday: TH6PFP097; Friday: FR5PFP075 E-Linac Photo-Fission Driver for RIB at TRIUMF 9
10 Beam dynamics (continued) E-Linac Photo-Fission Driver for RIB at TRIUMF 10
11 Electron Source Thermionic gun inexpensive, simple, low maintenance NIST/JLab electron gun was donated to TRIUMF Being converted from diode to triode RF modulated gun avoids chopping and high power beam dump at linac start ΔW (kev) 0-1 RMS Ellipse ΔΦ (degree) Longitudinal emittance simulation (SIMION 3D ) at the gun exit Electron gun development stand E-Linac Photo-Fission Driver for RIB at TRIUMF 11
12 Cavity Development with PAVAC PAVAC is a local company with EBW expertise Now produces 20 QW 141MHz cavities for ISAC-II PAVAC to produce two single cells by summer 2009 Dies sourced from FNAL/RRCAT Forming and welding tests underway (in copper and Nb) E-Linac Photo-Fission Driver for RIB at TRIUMF 12
13 Collaboration with VECC* Same goal: build electron linac for RIB Share resources Signed MOU in 2008 Scope: build and test with beam at TRIUMF two Injector Cryo-Modules (ICM) at 10MeV/50kW * VECC=Variable Energy Cyclotron Centre (Kolcata, India) TRIUMF/VECC collaboration poster: MO6RFP090 E-Linac Photo-Fission Driver for RIB at TRIUMF 13
14 The Schedule July 2009 Conceptual design Single cavity of beta=1 prototyping and test December 2009 ICM design November 2010 Assemble ICM1 May 2011 Beam test with ICM1 in ISAC-II Build e-linac infrastructure in Proton Hall December 2011 Test ICM2 in Proton Hall July 2013 E-linac beam test at 25 MeV November 2013 Ready for RIB production 2017 E-linac beam test at full energy and full power E-Linac Photo-Fission Driver for RIB at TRIUMF 14
15 Summary E-linac is a major new RIB source, complementary to cyclotron Opens new science horizons with neutron-rich RIB L-band SCRF cost effective MW-class fission driver Capitalization on world-wide SRF R&D Light source technology test bed Allows participation in other SRF projects (e.g. SPL, ILC etc.) E-Linac Photo-Fission Driver for RIB at TRIUMF 15
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