Technical Design Report Super Fragment Separator

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2.4 Super-FRS DRAFT 2.4.1 System Design Status February 2008 The present technical design report of the Super-FRS has been continuously optimised and adapted to the constraints of its technical realization, the discussions and collaborations with industry and leading institutes worldwide. Ion-optical parameters, such as dimensions of magnets and drift lengths have been selected to accommodate the specific target equipment and beam catchers required for the full operating domain of the FAIR accelerator facilities. The experimental areas of the Low- and High-Energy Branches have been reconsidered in more detail since the FAIR Baseline Technical Report and are designed to enable the planning and construction of the corresponding buildings which will be installed in the first phase of FAIR. 2.4.1.1 The Super-FRS in the FAIR Project The Super-FRS will be the most powerful in-flight separator for exotic nuclei up to relativistic energies. Rare isotopes of all elements up to uranium can be produced and spatially separated within some hundred nanoseconds, thus very short-lived nuclei can be studied efficiently. The Super-FRS is a large-acceptance superconducting fragment separator with three branches serving different experimental areas including a new storage-ring complex. The new rare-isotope facility is based on the experience and successful experimental program with the present FRS [1]. The Super-FRS magnetic system will consist of three branches connecting different experimental areas, see Figure 2.4.1. Reaction studies under complete kinematics, similar to the present ALADIN-LAND [2] setup, will be performed at the High-Energy Branch. Unique studies will be performed in the Ring Branch consisting mainly of a collector ring CR, the NESR, RESR and an electron nucleon collider (eA). Precision experiments with a brilliant electron-cooled exotic beam including reaction studies with the atoms of an internal target will be done in the NESR. A novelty will be electron scattering from exotic nuclei in the eA-collider section. The Low-Energy Branch of the Super-FRS is mainly dedicated to precision experiments with energy-bunched beams stopped in a gas cell. This branch is complementary to the ISOL (Isotope Separator On-Line) facilities since all elements and short-lived isotopes can be studied. The layout of the Super-FRS consists of magnets with Bρmax of 20 Tm. The increased maximum magnetic rigidity compared with the FRS is determined by the goal to circumvent atomic charge-changing collisions up to the heaviest projectile fragments. Although the CR is restricted to 13 Tm and the energy buncher to 7 Tm it is cost effective to apply the same type of magnetic elements throughout the separator which allows in addition the use of an additional degrader at the final achromatic focal plane, an option which is successfully applied at the present FRS. 6
DRAFT Table 2.4.1: Parameters of the Super-FRS compared with the existing FRS at GSI. Facility Max. Magnetic Rigidity Bρmax / [Tm] Momentum Acceptance ∆p/p Angular Acceptance φx / [mrad] φy / [mrad] FRS 18 ±1 % ±7.5 ±7.5 Super-FRS 20 ±2.5 % ±40 ±20 Momentum Resolution 1500 (ε=20π mm mrad) 1500 (ε=40π mm mrad) Figure 2.4.1: Layout of the superconducting fragment separator Super-FRS for the production, separation, and investigation of exotic nuclei. Spatially separated rare-isotope beams are delivered to the experimental areas via three different branches. The ion-optical layout of the focusing system in front of the production target and of the energy-buncher system (LEB-spectrometer) matches the experimental conditions. A high-resolution magnetic spectrometer (HEB-Spectrometer) has been designed for the high-energy experimental area (R 3 B project). 7
Page 1 and 2: DRAFT Technical Design Report Super
Page 3 and 4: Preface DRAFT The International Fac
Page 5: Contents DRAFT 2.4.1 System Design
Page 9 and 10: DRAFT degrader stage which provides
Page 11 and 12: Pre-Separator DRAFT In order to acc
Page 13 and 14: DRAFT coupling coefficients is give
Page 15 and 16: DRAFT Table 2.4.3: First-order matr
Page 17 and 18: DRAFT Main-Separator to the high-en
Page 19 and 20: DRAFT Table 2.4.5: Transmission T o
Page 21 and 22: DRAFT Figure 2.4.15: Resolution nec
Page 23 and 24: DRAFT Figure 2.4.17: Spectrometer m
Page 25 and 26: DRAFT Table 2.4.8: Design parameter
Page 27 and 28: DRAFT Figure 2.4.20: Side view of t
Page 29 and 30: DRAFT Figure 2.4.23: Coil cross-sec
Page 31 and 32: DRAFT Figure 2.4.25: Flux density d
Page 33 and 34: Figure 2.4.29: Assembly of two half
Page 35 and 36: DRAFT Figure 2.4.31: Cross section
Page 37 and 38: Figure 2.4.34: Sketch of the therma
Page 39 and 40: DRAFT To fulfill the required field
Page 41 and 42: DRAFT Figure 2.4.39: The 3D model o
Page 43 and 44: DRAFT Pole radius mm 100 210 250 25
Page 45 and 46: DRAFT Figure 2.4.43: Front, side, a
Page 47 and 48: ∆B/B 0.0 DRAFT Figure 2.4.46: Ave
Page 49 and 50: DRAFT Figure 2.4.50: 3D model of th
Page 51 and 52: DRAFT Figure 2.4.54 and Table 2.4.1
Page 53 and 54: DRAFT 2.4.2.3.1 Radiation resistant
Page 55 and 56: DRAFT The water-cooled radiator con
Page 57 and 58:
DRAFT Table 2.4.17: Coil parameters
Page 59 and 60:
DRAFT Figure 2.4.63: Field distribu
Page 61 and 62:
DRAFT Figure 2.4.65: Multiplet conf
Page 63 and 64:
DRAFT Table 2.4.21 summarizes the r
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2.4.2.6 Current Leads DRAFT The cur
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DRAFT Table 2.4.23 presents the lis
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2.4.3 Power Converters DRAFT The po
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SCR structure DRAFT Regarding high
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a) Chopper circuit 3x400V b) Half b
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External Control System Data transf
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DRAFT Figure 2.4.77: Arrangement of
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SuperFRS Power Supply Effective App
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DRAFT The locations for the differe
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DRAFT Figure 2.4.80: Beam induced f
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DRAFT Figure 2.4.82: Two hybrids ca
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DRAFT Figure 2.4.84: Left panel: TP
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DRAFT extracted beams. Its use for
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Time of Flight measurement DRAFT At
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DRAFT together. Another option is t
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DRAFT Figure 2.4.88: Pillow seal po
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DRAFT Figure 2.4.90: Setup at the m
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DRAFT An overview of the total vacu
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2.4.7.4 Appendix - Technical Drawin
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DRAFT Figure 2.4.96: Diagnostic cha
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DRAFT Figure 2.4.98: Diagnostic cha
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DRAFT Figure 2.4.100: Diagnostic ch
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2.4.8 Particles Sources n/a 2.4.9 E
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DRAFT movable, but BC3 must be able
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DRAFT Figure 2.4.106: Spot size of
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dE/dV [kJ/cm 3 ] 3 2 1 DRAFT includ
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2.4.11.1.4 Design of the beam catch
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DRAFT Figure 2.4.110: Calculated eq
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DRAFT Figure 2.4.112: Location of b
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DRAFT the carbon. Again mainly 7 Be
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DRAFT maintenance of the carbon or
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DRAFT material) and received the an
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DRAFT commissioned in February 2005
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DRAFT Table 2.4.28: Typical beam pa
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DRAFT Figure 2.4.120: Surface tempe
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DRAFT Figure 2.4.123: Schematic lay
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DRAFT These results show that the i
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DRAFT Like in the case of the rotat
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DRAFT Figure 2.4.126: Left: Schemat
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Page 145 and 146:
DRAFT Figure 2.4.129: Flow scheme o
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DRAFT Since the weight of the cold
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DRAFT With the cooling capacity spe
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DRAFT Figure 2.4.134: Schematic of
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S1 (a) Figure 2.4.136: (a) Zoom of
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2.4.A Appendix DRAFT The appendix o
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DRAFT experiment the EXL community
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2.4.A1.3 Slow control and monitorin
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DRAFT Figure 2.4.139: Architecture
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DRAFT all FAIR accelerators will be
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DRAFT source tier are split in two
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DRAFT coupled from the ACS which is
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DRAFT 2.4.A3.2 Work packages: descr
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2.4.A3.2.4 Instrumentation Measurin
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DRAFT this, planning a network layo
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DRAFT 2.4.A3.3 Machine characterist
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DRAFT installation of RALF was done
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DRAFT The double ring synchrotrons,
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DRAFT The first refrigerator, Cryo1
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DRAFT shield 28874 + 25 g/s 22 bar
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LHe storage Helium storage Helium s
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Cryo2 Cryo3 CryoST DB 3 DRAFT Compr
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DRAFT The cold connection will be m
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DRAFT Measurements planned for each
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DRAFT For magnets with less stringe
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DRAFT The value, parameters, condit
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DRAFT 3. Geometry tests For cryosta
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DRAFT The Quench Heaters Tests has
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DRAFT Figure 2.4.159: Photograph of
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DRAFT The field properties listed i
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DRAFT Figure 2.4.161: Schematic vie
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DRAFT Figure 2.4.162: Scheme of the
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2.4.A6.2.2 Shielding against direct
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Page 213 and 214:
DRAFT Figure 2.4.165: An iron beam
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DRAFT In a side view the flux of pr
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DRAFT catcher 7 Be, 22 Na and 24 Na
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DRAFT at the FRS (2·10 9 /spill as
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DRAFT [1] H. Geissel et al., Nucl.
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DRAFT [74] A. Fabich and J. Lettry,
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