Abstract

The Super FRagment Separator (Super-FRS) at the FAIR facility will be the largest in-flight separator of heavy ions in the world. One of the essential steps in the separation procedure is to stop the unwanted ions with beam collimators. In one of the most common situations, the heavy ions are produced by a fission reaction of a primary 238U-beam (1.5 GeV/u) hitting a 12C target (2.5 g/cm2). In this situation, some of the produced ions are highly charged states of 238U. These ions can reach the collimators with energies of up to 1.3 GeV/u and a power of up to 500 W. Under these conditions, a cooling system is required to prevent damage to the collimators and to the corresponding electronics. Due to the highly radioactive environment, both the collimators and the cooling system must be suitable for robot handling. Therefore, an active cooling system is undesirable because of the increased possibility of malfunctioning and other complications. By using thermal simulations (performed with NX9 of Siemens PLM), the possibility of passive cooling is explored. The validity of these simulations is tested by independent comparison with other simulation programs and by experimental verification. The experimental verification is still under analysis, but preliminary results indicate that the explored passive cooling option provides sufficient temperature reduction.

Highlights

  • The Super FRagment Separator (Super-FRS) will be the largest in-flight separator of exotic nuclei in the world [1]

  • The produced exotic nuclei are extracted from the target by their forward momentum and guided through a series of dipole and quadrupole magnets and beam collimators to remove the unwanted ions

  • One block is without any cooling, another block is provided with passive cooling by stainless steel ribs and the third block is provided with another type of passive cooling: a special coating with > 0.9 [3]

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Summary

Introduction

The Super FRagment Separator (Super-FRS) will be the largest in-flight separator of exotic nuclei in the world [1]. The produced exotic nuclei are extracted from the target by their forward momentum and guided through a series of dipole and quadrupole magnets and beam collimators to remove the unwanted ions. Power of up to 500 W [3] These energies will activate the first collimators and their surroundings up to a level that is dangerous for humans, even when the beam is switched off [1]. This means that the X-slit system should be sufficiently cooled to handle this 500 W

Overview of the X-slit system
Cooling options for the X-slit system
Simulation verification
Experimental verification
Conclusion
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