| Latest news ( for system description see below): | |
|
22. February 2013: New
beam time - preparation for user operation |
27. March 2013: preparation for next beam time
(5.-7. April 2013) |
|
2011 Nov. 9th: Photos
shown during a small party in our workshop to celebrate the first successful use
of MePS at HZDR (Link) |
September 2011 - February 2013: No beam time due to extension of ELBE hall |
2011-09-20: Preparation of next beam time (Link) |
2011-09-26: Successful beam time in September 2011(Link) |
2011-06-02: Beam time in begin of June 2011(Link) |
2011-06-20: MePS
beamtime: test of chopper (Link) |
| Kicker Meeting FZD 12.1.2011- Talk of RKR (Link) | 2010-11-11: MePS
Beamtime: 2nd test of chopper (Link) |
2010-May-25:
Continuation of MePS beamline (Link) |
2010-June-03: Beamtime for MePS
adjustment (Link) |
2010-March-02:
Further
built-up of MePS system and test of time structure |
2010-April-22:
Adjustment of large magnet by 4 Hall probes at beam line |
2009-Nov-30:
Coil winding around a further bended coil |
2010-01-29:
GiPS Beamtime - neutron activated Fe-Cr samples were measured |
2009-September-15:
First positrons
at MePS (Mono-energetic Positron Spectroscopy) @ EPOS! |
2009-October-29: Further beam time for
testing the time structure at MePS and for
GiPS development |
2009-February: Beam
adjustment by electrons |
2009-March-4: Final preparations for
initial operation of positron converter |
2008-October: 22-Na
source installed for test purposes |
2008-December: We successfully tried
GiPS (Gamma-induced Positron
Spectroscopy) |
2008-July-15: We
got the electrons through the beam line!  |
August 2008: we are starting the beamline
in the lab |
2008-July-02: We
(RKR, Marco Jungmann, Maik Butterling, and Nicki Hinsche) continued to
build up the lead screening  |
2008-July-09: We installed an electron
beam source for the easy adjustment of the magnetic beam guidance system |
Wolfgang Anwand is
now member of the EPOS construction team |
We started the erection of the concrete
radiation screening  |
2008-April-23:
Vacuum system sufficiently tight. Lead castle is growing |
2008-April-30: This time we mounted
additional steering coils in the cable tunnel.- a very difficult work
only for sportive students |
2008-April-02:
Converter chamber removed for welding |
2008-April-10: Converter chamber is
still leaking after additional welding (p-end=8E-7 mbar). We decided to
built a new chamber from stainless steel. We will use an alloy which
resists neutron activation (Alloy 1.4006 without Ni, which would form
60-Co). However, the leak of the current chamber is not so bad, so that
we can continue to test the beam guidance system by electrons and
positrons from a 22-Na source. Moreover, we started the wiring for the
magnetic guidance and steering system. |
2008-March-26: some
vacuum problems solved, but still one weld leaking...  |
|
2008-Febr-27:
Vacuum system at converter chamber is installed |
2008-March-3: Problems with cutting lead
bricks |
2008-January-22:
Welding of water pipes for beam dump |
2008-Febr-14: Mounting of converter
chamber |
2007-12-19: Leak
testing - finally the system was tight |
2008-01-15: Beamdump and converter
chamber mounted for the first time |
|
2007-11-27: Start of assembling the EPOS vacuum
system in Cave 111b - Beam line through cable tunnel is installed |
The intense positron source EPOS is under construction as an external research facility of the “Center of Materials Research - CMAT” of the University Halle at the ELBE Radiation Source at Research Center Rossendorf. It will be dedicated to materials research. The unique time structure of ELBE (short electron bunches in cw mode – 5ns, 13 MHz) will directly be used to form a monoenergetic positron beam. Positron lifetime spectroscopy will become the most important experiment. A large counting rate will be possible by a multi-detector system. Moreover, Coincidence Doppler Broadening Spectroscopy and AMOC will be possible. The detector system shall be completely digital in order to have almost no tuning elements. This allows the remote control of the system. The EPOS system will be operated as a user-dedicated facility. The lab itself is now under construction, and the design work for the positron beam itself started too.
