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GSI-ACCELERATORS-04 GSI SCIENTIFIC REPORT 2009 UNILAC Status and Developments W. Barth, L. Dahl, P. Gerhard, L. Groening, M. Maier, S. Mickat, M.S. Kaiser, H. Vormann, S. Yaramishev, GSI, Darmstadt, Germany . Status of Operation For further biology experiments under therapy conditions a carbon beam from the Electron Cyclotron Resonance (ECR) ion source was accelerated via the high charge state injector (HLI) in the UNILAC for the SIS-injection (2 weeks) [1]. Additionally UNILAC experiments used the beam from the HLI with a duty factor of up to 30 %. Furthermore the ECR source was in operation for the production of various isotopes (3H, 6 Li, 7 Li, 34 S, 48 Ca, 54 Cr, 122 Sn, 124 Sn, 136 Xe) as well. During a four weeks block with sulphur beam and a two weeks block of chromium beam at the beginning of 2009 experiments for the Super Heavy Element synthesis (SHE) were supplied. Besides 48 Ca was used for two weeks at the SHIPTRAP. Dominantly during two long runs of six weeks 48 Ca-beam could be delivered to the TASCA-Separator for chemistry experiments. Additionally ion beams with different Zinc isotopes were used for the UNILAC-experiment X7 at low beam energy. The ECR-beam (3H, 6 Li, 7 Li) was also injected into the SIS 18 for high energy fixed target experiments as well as for ESR-experiments. The Penning (PIG) ion source provided 40 Ar, 56 Fe, 58 Ni, 96 Ru, 136 Xe, 197 Au and 238 U beams with medium intensity, especially for high duty factor experiments with heavy ions at UNILAC-beam energies. Mainly the heavy ions were delivered especially for the material research experiments at the new M-branch and at X0. Light ions as well as heavy ions from the PIG were accelerated via High Current Injector (HSI) in the UNILAC with short pulses for the SIS 18. The MUlti Cusp Ion Source (MUCIS) provided beams for different high-energy experiments with high intensities (H2, 40 Ar). The Metal Vapour Vacuum Arc (MEVVA) ion source delivered 181 Ta and 238 U beams for SIS-injection. After a long time of absence the UNILAC was in operation for five weeks for uranium machine studies as well as for a week block of regular uranium beam experiments. Heavy ion machine experiments in preparation for the UNILAC as an injector for FAIR were performed additionally with tantalum (medium intensity) and high current argon beams. Shutdown Working During shutdown time new power supplies for the Alvarez 2a, 2b, 3 and 4 inner tank quadrupoles were installed, enabling stronger beam focussing in the whole poststripper section. The Alvarez tank revision program starting in the winter shutdown 08/09 was finished for tank no. 1. Furthermore an advanced chemical rinsing procedure was successfully tested and applied for the cooling system of the drift tubes and tank mantle of ALVAREZ 1 and 2, due to a critical occlusions with ferric oxide particles. The 132 chemical rinsing will be extended to the other tanks in the next years. The defective cooling resulted in a overheating of one A3-drift tube and its quadrupole. Accordingly after a long time of beam operation with limited duty factor and reduced focussing strength, a new drift tube was successfully installed in the wintershutdown 09/10. Design and fabrication of the drift tube and the quadrupole was completely accomplished in the GSI-workshops. Additionally another three defective tank quads inside AL- VAREZ were detected. An advanced repair program is already scheduled. But for all that the UNILAC operated with high reliability. [1] UNILAC-Upgrade Measures Fig. 1: The new RFQ for the HLI (left) and the HSI-RFQ with newly installed electrodes (right). Different UNILAC-upgrade projects were planned and accomplished in essence: - HSI-RFQ-Upgrade for FAIR [2] - Preparation of the HSI-LEBT-Upgrade for FAIR [2] - Beam investigations at the High Current Test Bench with a sc-solenoid - High Current beam diagnostics for the FAIR-UNILAC- Upgrade: Mounting of additional BIF-stations in the UNILAC and the transfer line to the SIS18 - Commissioning of a 8 kW-rf-amplifier prototype and the first delivery of the batch fabrication - HLI-RFQ-Upgrade [3] Machine Experiments 11 days of machine experiments were performed with an high current argon beam mainly for commissioning of the upgraded HSI-RFQ. Two days with a tantalium beam and one days with uranium beam were accomplished for recommissioning of the UNILAC with low charged heavy ion beams from the MeVVa-ion source. Finally in december the ECR ion source delivered argon beam for one week of experiments in the HLI-LEBT in preparation of the HLI-RFQ-upgrade [3]. References [1] U. Scheeler et. al., Accelerator Operation Report, (this report) [2] H. Vormann, et. al., HSI Frontend-Upgrade, (this report) [3] P. Gerhard, et. al., Status of the HLI-RFQ-Upgrade (this report)
GSI SCIENTIFIC REPORT 2009 GSI-ACCELERATORS-05 GSITemplate2007 Annual neutron doses in the UNILAC experimental hall Introduction GSI has the obligation to verify that the accelerator operation is in compliance with the radiation protection ordinance and that the conditions given in the permissions of the authority (HMUELV) are fulfilled. For this purpose, dose measurements must be performed. From these dose measurements the annual dose values are derived for various radiological areas at the UNILAC and the experimental hall. The assumed definition of the different kind of radilogical areas (controlled, area, survey area and free accessible areas) must be checked or – if neccessary – conformed. Method of measurement The overall dose values outside the shielding of the accelerators and experimental areas consist in most cases of neutron and photon radiation. The GSI's Safety and Radiation Protection division provided thermoluminescence detectors (TLD, type 6776) for the dose measurements. The TLD cards consists of two 6 LiF (sensitive for n- and γ -radiation) and two 7 LiF (sensitive for γ-radiation but not for n-radiation) elements and were mounted in moderator spheres (diameter: 30 cm) made from polyethylene (PE). The TLDs are sensitive to neutrons with energies from the thermal range up to the highest energies. The advantage of this system is that the dose reading is independent on the spill structure of the beam, i.e. there are no dead time effects etc. in contrary to the active systems. Figure 1: Measurement positions of the neutron doses in the UNILAC experimental hall. Annual doses in 2008 and 2009 Figure 1 shows the downstream part of the UNILAC, a part of the TK and the experimental areas with the posi- Ch. Pöppe 1 , G.. Fehrenbacher 1 1 GSI, Darmstadt, Germany tions of the neutron detectors. The detectors are placed on the roof of the caves. It can be seen (Tab. 1) that the dose values 2008 are in the range of 0.01 mSv/a up to 7 mSv/a. The largest dose values are measured at X1, X0 and Y7. All these locations are not accessible during experiment operation. In case of X1 it is sometimes necessary that the area around the cave must be declared as a temporarily controlled area because the dose rates are higher than 3 µSv/h (threshold dose rate value for the definition of controlled areas). In 2009 the range of the values reach from 0.07 up to 0.71 mSv/a. In comparison to the annual values of 2008 the dose values are generally lower, on average by a factor of 1.4 if the dose values at X1 are not taken into account. At the area X7 experiments are carried out with ion beams which have energies below the nominal Coulomb threshold energy. During recent experiment periods it turned out that during the preparatory beam operation for the experiment substantial dose rates can occur (use of illumination targets etc.). Therefore additional shielding measures will be installed in the year 2010. In 2010 an elaborate dose survey program is planned for both the assessment of the annual exposure using the TLD's as well as detection of the peak dose rates focused on the areas X1, X7, X8 and Y7 with rem counters. Table 1: Measured Neutron doses in the UNILAC experimental hall outside the shielding, the positions are shown in Fig. 1 Neutron - Dose H*(10) [mSv] Position Area 2008 2009 1 end of UNILAC 0.19 0.12 2 end of UNILAC 0.15 0.16 3 end of UNILAC 0.30 0.21 4 TK 0.01 0.15 5 TK 0.01 0.15 6 TK 0.01 0.09 7 X 1 7.00 0.12 8 X 2,3 0.37 0.12 9 X 4 0.29 0.22 10 X 6 0.35 0.28 11 X 8 0.52 0.71 12 X 0 1.44 0.38 13 Y 7 1.25 0.41 14 M 1 - 0.08 15 M 3 - 0.07 References [1] T. Radon, G. Fehrenbacher,, Ch. Pöppe, J. Sauer, and M. Wengenroth, GSI annual report 2008 133
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