KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 1 KATRIN: An experiment to.

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Presentation transcript:

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 1 KATRIN: An experiment to determine the neutrino mass Florian Fränkle for the KATRIN Collaboration

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 2 Motivation from cosmology determine absolute neutrino mass scale probe cosmological relevant region help to understand neutrino mass generation mechanism Upper limit on neutrino mass: m < 2.3eV (  -decay) KATRIN: only model independent determination of “electron anti-neutrino mass”, sensitivity: 0.2 eV

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 3 Tritium  -decay tritium as  emitter: high specific activity (half-life: 12.3 years) low endpoint energy E 0 (18.57 keV) super-allowed observable: Fermi theory of  -decay:

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 4 KATRIN experiment 70 m tritium decay electron transport energy analysis tritium retention (KArlsruhe TRItium Neutrino experiment, location: Forschungszentrum Karlsruhe)  -decay rate: Hz T 2 pressure: mbar background rate: Hz T 2 pressure: mbar adiabatic guiding of electrons on meV level about 14 orders of magnitude

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 5 WGTS purpose: Delivery of  -decay electrons per second requirements: Stability of T 2 density profile of (function of: injection rate, purity, beamtube temperature T B, pump rate) T B homogeneity ±30 mK T B stability ±30 mK h -1 properties: Beam tube: 10m length, 90mm diameter, absolute temperature 30K Tritium loop: 40g T 2 / day status: Demonstrator to test new cooling concept 2009 Construction 2010/11 Commissioning 2012 Longitudinal source profile T 2 Pumping T 2 Injection 3.6 Tesla TLK provides complex infrastructure to handle tritium

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 6 tritium retention purpose: reduce T 2 flux by 10 5 purpose: reduce T 2 flux by 10 7 T2T2 6.2m T2T2 T2T2 status: Delivered to FZK 2 days ago! Acceptance tests test program 2010 status: Technical design report is ready presently being manufactured at ASG Delivery to FZK on Commissioning 2011 differential pumping of T 2 (TMPs) magnetic guiding of electrons (5.6T) removal of positive ions (dipole) cryosorption of T 2 on Argon frost concept successfully tested (TRAP) T2T2 cryosorption Ar frost stainless steel Differential Pumping Section:Cryogenic Pumping Section:

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 7 Arrival of DPS

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 8 tritium retention purpose: reduce T 2 flux by 10 5 purpose: reduce T 2 flux by 10 7 T2T2 6.2m T2T2 T2T2 status: Delivered to FZK 2 days ago! Acceptance tests test program 2010 status: Technical design report is ready presently being manufactured at ASG Delivery to FZK on Commissioning 2011 differential pumping of T 2 (TMPs) magnetic guiding of electrons (5.6T) removal of positive ions (dipole) cryosorption of T 2 on Argon frost concept successfully tested (TRAP) T2T2 cryosorption Ar frost stainless steel Differential Pumping Section:Cryogenic Pumping Section:

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 9 main spectrometer purpose: energy analysis status: First vacuum test without getter pump successful ( mbar)! Mounting of inner electrode system Electro-magnetic test measurements 2010 energy resolution 18.6keV pressure < mbar background event rate < 10mHz stable HV system -18.6kV) properties: requirements: MAC-E filter (integrating high pass filter) volume: 1240m³, surface: 689,6m² inner electrode system variable voltage to scan E 0 region background rejection: U 0 =-18.4kV U V e-e- U V  B spectrometer wall

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 10 main spectrometer

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 11 detector system purpose: counting transmitted  -decay electrons status: Assembly and initial commissioning until 02/2010 Delivery to FZK 03/2010 intrinsic background rate < 1mHz in RoI electron energy range 5 to 100keV energy resolution < 1keV properties: requirements: segmented monolithic Silicon PIN Diode 148 pixels, area ~ 50mm² each post acceleration (up to 30kV) 100 mm pinch magnet 6T calibration system detector magnet T

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 12 pre-spectrometer purpose: reduce  -decay electron flux by 10 6 status: end of test measurements 12/2009 relocation of pre-spectrometer to main spectrometer hall 2010 MAC-E filter energy resolution -18.4keV pressure mbar pre-spectrometer test setup 1detector 2magnets (4.5 T) 3vessel 4electrode system 5electron gun6valve vacuum concept successfully tested (p = mbar, routinely) active HV stabilization tested test of new electromagnetic design background suppression optimization of electrode system prototype for main spectrometer:

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 13 pre-spectrometer vessel magnet wire electrode full metal electrodes ground electrode Penning trap GND magnetic field U < 0V Combination of electric and magnetic fields can create Penning traps  Penning discharge can be major background source! GND U < 0V magnetic field rate over time rate > 5kHz Detailed investigations of Penning traps Check of parameter space: pressure, potential, magnetic field Penning Trap:

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 14 new electrodes G 0kV A -18kV B -18kV 360mm A 310mm G new electrodes to remove Penning trap design also applied to main spectrometer Anti Penning electrode Ground electrode

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 15 new electrodes new electrodes to remove Penning trap design also applied to main spectrometer G 0kV A -18kV B -18.3kV 360mm A 310mm G Anti Penning electrode Ground electrode

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 16 Penning discharge  U=0  U=-100V  U=-200V  U=-300V a 180V deep penning trap ignites after some minutes. ignition stops if B < A (as expected from calculation)  Penning discharge is under control!  U=A-B

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 17 summary & outlook KATRIN will measure electron anti-neutrino mass with a sensitivity of 0.2 eV Tritium source: construction 2011/12 Tritium retention: DPS: arrived 2 days ago, acceptance tests & test program CPS: TDR ready, presently being manufactured, delivery to FZK 10/2010 Pre-spectrometer: test setup important for main spectrometer design Main Spectrometer: electrode installation & start of EM test program 2010 Detector: assembly & initial commissioning, delivery to FZK 03/2010 Assembly of components & system integration 2011/12 Start of T 2 measurements: summer 2012

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 18 KATRIN collaboration March 2009

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 19

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 20 discovery potential

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 21 energy spectra

KIT - The cooperation of Forschungszentrum Karlsruhe GmbH and Universität Karlsruhe (TH) Florian Fränkle EPS HEP 2009 Krakow 22 MAC-E filter M agnetic A diabatic C ollimation combined with an E lectrostatic Filter Energy resolution: Magnetic moment: MAC-E filter: E0E0+EE0E0+E 1 0 energy transmission p long. p trans. p  energy ideal filter: 1 0 E0E0 transmission transmission if E > E 0 + E t *B A /B max *sin²(  )