R-D Herzberg

The SAGE Spectrometer

The next four years

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Overview

• Brief Physics Case

• Technical description

• Work to be done

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Physics

• In heavy nuclei Gamma rays and conversion electrons compete.

E.g. for Z~100:

• E2: Conversion is dominant above 400 keV

• M1: Conversion is dominant above 200 keV

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Physics

• Any heavy (trans-)actinide nucleus must be studied twice:

gammas and electrons

• SAGE allows the simultaneous investigation of gamma rays and conversion electrons in the same experiment!

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Why us?

• We’ve done Juroshpere/gam• Dito SACRED• Dito GREAT• Dito TDR• Dito a lot of heavy element work

• A lot of experience and expertise is collected in this room!

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Ingredients

• Ge – Array John, Pete • Solenoid Paul, Juha

• Si – detector Rodi, Robert

• Electronics Ian, Jim, Patrick, Dave

• Mechanics Dave

• Software John, Simon, Vic

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Technical details

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Ge array

What shape do we want Jurogam to take in the future?

As is?

Clovers?

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Solenoid

• Need to efficiently transport the electrons from the target to the detector

• Must not interfere with Ge detectors

• Tricky: need optimisation

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Si detector

• High pixellation

• Rate distribution

• High rate capability

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Electronics

• DIGITAL

• TNT2 tests have been done

• Total capability up by a factor 12: 4 x segmentation, 3 x rate/pixel

• Huge data rates!

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Mechanics

• Target chamber• Solenoid support• Si detector chamber• Ge frame• Target wheel

• Windowless operation?

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2005 2006 2007 2008 2009

Q2

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Conceptual and mechanical design of SAGE                  

Manufacture, testing and installation                

Electronics design and implementation                    

Support of experimental programme                                  

GREAT, JUROGAM, SACRED exploitation                                  

SAGE + GREAT exploitation                        

Data analysis and dissemination