| Dec 10., 2008 |
First Beam through HDSM at 1558 MeV! At 2.10pm 43 turns / 1558MeV reached! Only 4 hours later the beam was delivered into the A2-hall successfully and could be used by experimentators.
|
| Jul 23., 2008 |
1.5GeV, 80uA high power operation on the A4 dump (motivated by radiation protection measurements). First operation of the A4 chicane with 1.5GeV electron beam energy.
|
| May 2., 2008 |
Starting on 10th of August 1990 (first 855MeV from MAMI B) MAMI accumulated till today 100.000 hours of operation time.
|
| Mar. 10., 2008 |
In a two months shutdown of the HDSM (MAMI B operation with 855MeV max. energy already started on 14.01.2008) the MAMI C cooling plant was upgraded. The two old tube heat exchangers were replaced by two new plate heat exchangers with roughly the doubled heat transfer capacity. This will allow a more stable and reliable operation of the HDSM especially on hot and humid summer days. From beginning on the new cooling plant works very reliable and stabilises the HDSM cooling water temperature in steady state operation to 30°C ± 0.05°C.
|
| Dec. 20., 2007 |
In the year 2007 MAMI was operated for 7180h (all time record for MAMI operation) from which 3280h were served with 1.508GeV beam energy.
|
| Dec. 12., 2007 |
First use of the system for energy variable beam extraction. By placing the moveable extraction dipole on turn No. 9 a 1002.4MeV beam was extracted and delivered to the Tagger Hall (A2-collaboration). The complete procedure needs approx. 2h. With this system additional beam energies in the range of 871.7 MeV up to 1307.8 MeV in steps of approx. 15.6 MeV are available aside the maximum energy of 1.508GeV.
|
| Oct. 24., 2007 |
During test runs the MAMI C cw design current of 100µA at 1.508GeV beam energy (more than 150kW of beam power on the A1-dump in the spectrometer hall) was reached.
|
| Oct. 5., 2007 |
Inauguration ceremony of MAMI C.
More than 200 guests attended this ceremony with welcome addresses from Doris Ahnen (Minister for Education, Science, Youth, and Culture), Prof. Georg Krausch (President of the Johannes Gutenberg-Universität), Prof. Dietrich von Harrach (Vice-Dean of the Faculty of Physics, Mathematics, and Computer Science) and lectures by Prof. Klaus Wille (Zentrum für Synchrotronstrahlungsforschung, TU Dortmund and Prof. Richard G. Milner (Massachusetts Institute of Technology, U.S.A.).
|
| Sep. 30., 2007 |
In the first 9 months of 2007 MAMI C accumulated 5500h of beam time, from which already 2500h were used for experiments with 1.508GeV beam energy.
|
| Mar. 29., 2007 until Apr. 16., 2007 |
Approx. 12 days of HDSM 1.508GeV operation for A2 (Tagger and Crystal Ball commissioning). Only interrupted due to Easter break.
|
| Apr. 02., 2007 |
15µA beam current on A4 dump (limited due to polarimeter-setup in the A4 dump beam line, which otherwise would be overheated).
|
| Mar. 30., 2007 |
First beam on the A4 beam dump (only diagnostic pulse mode for first commissioning of A4 beamline).
All three experimental stations A1 (spectrometer hall), A2 (Tagger Hall) and A4 already received the 1.508GeV MAMI C beam.
|
| Mar. 29., 2007 |
First 1.508GeV operation with beam in the Tagger Hall and 326A excitation current through the Tagger-Dipole (at ~1.825T field) to the A2-dump. Commissioning of the Tagger setup started.
|
| Feb. 23., 2007 until Mar. 05., 2007 |
On afternoon of 23.02.2007 we start the first production beam time with 10µA polarized beam (max. measured polarization: 84%) at 1.508GeV for the A1-collaboration! Within ten scheduled days of operation we had more than 80% beam on target and A1 acquires 170h of full data taking! On 27.02.2007 we performed a high current test and with reasonable radiation level in the HDSM halls 50µA beam current (75.4kW beam power) was easily possible.
|
| Jan. 08., 2007 until Jan. 22., 2007 |
In this period we had a total of 14 days of test beam for further commissioning of the HDSM. In this time lots of beam measurements to optimise the beam transport through the recirculation arcs take place and the extraction beamline to the beam transfer tunnel was completed. A first low power test beam was guided into the spectrometer hall within some hours of beam time. With the availability of a high power beam dump in the spectrometer hall, we start increasing the beam current from nA to µA, optimising the beam losses to an level below 10-5. First tests with polarised electrons were performed.
|
| Dec. 20., 2006 |
After a complete shutdown over night, MAMI C was again set into operation and without any problems acceleration to 1508MeV was possible. After some fine tuning of the transverse matching and adjustments of linac amplitudes and phases now a "loss free" (on the level of the present available diagnostic) acceleration is possible. The measured phase signals are in excellent agreement with the by simulations predicted values.
|
| Dec. 19., 2006, 19.31 |
First Beam through HDSM ! At 7.31pm 43 turns / 1508MeV reached ! The Machine runs reliable and stable, without any significant alteration of intensity or phase signals, for some hours. Because the extraction beam line vacuum system is still under construction, the machine was operated in diagnostic pulse mode (10ns long 100µA pulses with up to 10kHz : 10nA beam current) with low power.
|
| Dec. 18., 2006 |
At 3.45pm six and half turns in HDSM (~963MeV). Around 4pm again problems with rf-interlocksystem. It was not possible to solve them on the fly and therefore operation was stopped.
|
| Dec. 13., 2006 |
Section to section phase adjustment of all 4.90GHz linac sections completed. The 2.45GHz linac, 4.90GHz linac and the 4.90GHz matching section are phased and fully operational!
|
| Dec. 08., 2006 |
Operation of HDSM with the setting of the first full turn test of 22.11.06 (without acceleration in the two linacs). The parameter of the first test where reproducible and the beam could be guided to a full turn without any problem. The beam position monitor multiplexer system (XYMO Multiplexer) of the injection system and the linac axis beam position and phase/intensity monitor system was successfully commissioned, the beam focussing was optimised and the free beam aperture in all elements was checked.
|
| Dec. 06., 2006 |
Amplitude and phase regulation loops of all five 4.90GHz modules ready for operation (only final adjustment for full beamloading of 100?A still to be done). Section to section phase adjustment of matching section (with high power waveguide phase shifter) successfully done (the pre-calculated offset was correctly set).
|
| Nov. 27., 2006 |
Problem with 4.90GHz high voltage power supply solved; commissioning of 4.90GHz linac continued. Alignment of extraction beamline elements finished.
|
| Nov. 22., 2006, 15.32 |
The 855MeV MAMI B beam was injected into the HDSM and (without acceleration in the two linacs) a first full turn was realised. All elements could be operated with their precalculated values, demonstrating the excellent quality of the magnetic field correction of the four 250to, 1.54T dipoles and the alignment of all components
|
| Nov. 21., 2006 |
Module 4 and matching module conditioned up to nominal power. Further commissioning and final phasing hindered due to malfunction of 4.9GHz klystrons high voltage power supply
|
| Nov. 20., 2006 |
Last element of extraction beamline installed (now waiting for final alignment and vacuum/cooling water installation and cabling)
|
| Nov. 17., 2006 |
Module 1 and 2 of the 4.90GHz linac set into operation and conditioned to nominal power within 10h of operation; now only module 4 and the matching module missing and the final section phasing must be done
|
| Nov. 16., 2006 |
Vacuum system of HDSM up to the first valve of the exit beamline closed; all beam optic elements of the HDSM are now operational (4 x 90° bending dipoles with corrections coils and 7 local pole face correction coils each, 8 quadrupoles, 4 skew quadrupoles, 360 steerer magnets)
|
| Nov. 15., 2006 |
2.45GHz linac section to section phase adjustment completed (excellent reproducibility of the measurement of ±1°@2.45GHz demonstrated)
|
| Nov. 1., 2006 |
All HDSM steerer magnets (344) connected to their dedicated multichannel (128) power supply and successfully set in operation
|
| Oct. 27., 2006 |
Complete 4.90GHz linac under vacuum (valve to valve); all cooling water installations of the 4.90GHz rf-system in operation; waveguide system ready (only some interlock and rf-cables are missing)
|
| Oct. 24., 2006 |
Return path vacuum system between dipole 1 + 2 ready installed (43 turns, 86 tubes, 172 corrector magnets), including injection + extraction dipole
|
| Sept. 28., 2006, 16.33 |
During only 2h of beam test the 855MeV MAMI B beam could be successfully
guided through the HDSM injection beam line and was visible as a small,
well focused beam spot on a luminescence screen directly in front of
dipole No. 2 (after being bent by 90° through HDSM dipole No. 1). |
| 09/2006 |
Return path vacuum system between dipole 1 + 2 ready installed |
| 08/2006 |
First 4.90GHz rf-module (2 sections powered by one 50kW klystron, max. gradient 2.8MV) ready commissioned |
| 06/2006 |
Return path vacuum system between dipole 3 + 4 ready installed (43 turns, 86 tubes, 344 corrector magnets), including injection chicane |
| 03/2006 |
All four 90° bending dipoles of the HDSM finally equipped with vacuum chambers and correction coils; ready for operation |
| 2006 |
Installation of a Mott Polarimeter in the 3.5MeV extraction beam line behind the injector linac |
| Oct. 20.-22., 2005 |
Presentation of the experimental results at an International Symposium in Mainz “20 Years of Physics at the Mainz Microtron MAMI“ |
| 11/2005 |
Delivery of the last (No. 10) 4.90GHz linac section needed for the completion of the rf-system of the HDSM |
| 08/2005 |
2.45GHz linac of the HDSM (5 sections, 5 klystrons, 9MV energy gain) commissioned and ready for operation (except final section phasing) |
| 2003 – 2005 |
Installation of a spin rotator in the 100keV beam line of the polarised source; allows for arbitrary spin orientations in all experimental areas without energy tuning of the RTM cascade |
| 07/2003 |
Successful high power test of the in-house developed and built worldwide first 4.90GHz linac section (up to 22Kw cw rf power = 1.3MV/m accelerating gradient) |
| 2003 |
Installation of a chicane in the A4-beam line by the A4-collaboration
for beam polarisation measurements by photon back scattering |
| 2002 |
Installation of a 3.5MeV beam line behind the injector linac for
X1-experiments and for beam polarisation measurements |
| 2001 - 2003 |
Delivery and installation of the four 250t-HDSM-Magnets |
| 2001 |
Implementation of the mask activation technique at the polarised source. Lifetime increases from 22C to 115C extracted charge |
| 2001 |
Upgrade of the beam transport system for the future 1.5GeV beam
and construction of a separated beam line for the X1-experiments |
| 2001 |
Civil constructions and electrical installations to prepare two
halls buildings to the installation of the Double Sided Microtron |
| 1999 |
Approval of the 1.5GeV Harmonic Double Sided Microtron (HDSM) as a
fourth stage of MAMI |
| 1999 |
Installation of a Møller-Polarimeter in the A1-beam line by
the A1-collaboration |
| Jan. 8., 1999 |
Founding of the
Sonderforschungsbereich 443 of the
Deutsche Forschungsgemeinschaft
"Vielkörperstruktur stark wechselwirkender Systeme" |
| 1997 |
Synchro Laser operation (2.45GHz-pulsed) of the polarised source; 90% transmission / 20µA / 80% polarisation. |
| 1997 |
Installation of a beam line to the second experimental area of the
X1-collaboration. |
| 1996 |
Increase of the capture efficiency from 36 to 180deg in the 100keV
beam line. |
| 1996 |
Installation of a pulsed (2.45GHz) source of polarised electrons in
the accelerator hall |
| 1993 |
Installation of the first experimental area for the production of
coherent x-rays (Collaboration X1) |
| 1992 |
First acceleration of polarised electrons to full energy |
| Sep. 3.,1991 |
First beam from distant upstairs polarized electron source |
| Apr. 4., 1991 |
First experiment at 855 MeV of collaboration A2 |
| Jan. 29., 1991 |
Ceremonial opening of MAMI B, Completion of the new hall for
experiments of collaboration A1 |
| Aug. 10., 1990 |
First 855 MeV beam of MAMI B |
| June, 1990 |
First 183 MeV beam of reconstructed MAMI A, maximal beam current
110µA with new injector linac |
| Nov. 10., 1989 |
Operating licence for MAMI in the new buildings |
| May 13., 1988 |
Presentation of the experimental results in an
International Symposium in Mainz 'Physics with MAMI A' |
| Oct. 5., 1987 |
End of MAMI A operation in the old building with 18700 hours of
beam time
|
| Nov. 15., 1986 |
Completion of new MAMI halls |
| Jan. 31., 1984 |
End of 14 MeV experiments |
| Jan. 1., 1984 |
Founding of the
Sonderforschungsbereich 201 of the
Deutsche Forschungsgemeinschaft
"Mittelenergiephysik mit elektromagnetischer Wechselwirkung" |
| 1983 - 1990 |
Development of 855 MeV RTM 3 MAMI B and Injector Linac |
| Juli, 1983 |
First experiment at 183 MeV energy, maximal beam current
30µA |
| Feb. 17., 1983 |
First 183 MeV beam of MAMI A2 |
| Jan. 1., 1982 |
Establishing of a preliminary "Sonderforschungsbereich (SFB)" |
| Nov., 1979 |
First experiment at MAMI A1 |
| Mar. - Nov., 1979 |
Test period with 14 MeV beam, maximal beam current 25µA |
| Mar. 9., 1979 |
First 14 MeV beam of MAinz MIcrotron MAMI A1 |
| 1976 |
First publication
H. Herminghaus et al.:
The Design of a Cascaded 800 MeV Normal Conducting C.W. Race
Track Microtron
Nucl. Instr. and Meth. 138 (1976) 1 |
| 1975 |
Proposal of a Race Track Microtron |
| 1972 - 1975 |
Project studies about Microtrons |
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