Technical Design Report Super Fragment Separator

More documents

Recommendations

Info

DRAFT The standard ion-optical layout of the Pre-Separator is presented in Figure 2.4.5. The most relevant first order matrix elements are given in Table 2.4.2. In the first focal plane only in x-direction a focus is realized whereas in the symmetrical mid plane, the position of the first degrader system, in both coordinates foci are required and a parallel dispersion line. The system is mirror symmetric with respect to PF2, firstly to have the necessary three foci to achieve the achromatic condition at PF4, secondly to minimize the geometrical image aberrations. Furthermore, one has to consider the case that a relatively high intensity component of the primary beam (up to 1%), for example uranium ions in the Li-like charge state, can impinge on the degrader. This contamination can then be removed in the corresponding slit system (BC4-6) mounted within the second dipole magnet system of the Pre-Separator. Table 2.4.2: Calculated first-order transfer matrix elements at the focal planes PF1-PF4. The linear dimensions x and y are given in [m], a and b in [rad], and the momentum deviation δ in parts of the nominal value. Matrix element PF1 PF2 PF3 PF4 (x, x) -2.93 1.72 -2.75 2.00 (x, a) 0 0 0 0 (x, δ) 4.39 -2.58 4.07 0 (a, a) -0.34 0.58 -0.37 0.50 (a, δ) 0.52 0 -0.53 0 (y, y) -5.62 -2.17 4.20 1.96 (y, b) 2.65 0 -2.6 0 (b, b) -0.06 -0.46 0.03 0.51 drift length 3.6 5.0 4.4 6.0 The drift lengths between the magnetic elements and particular at the focal planes take into account the technical layout of the magnet system and accommodate the diagnostic elements. The benefit of the design is that the higher-order aberrations are small except for the chromatic contributions, especially (x,aδ) which is responsible for an enormous focal plane tilt. The tilt angle at PF2 would be about 7 degrees (required is 90 degrees) without second-order corrections by means of hexapole magnets. Such a tilt would make a high-resolution degrader operation very difficult or even impossible. Therefore, hexapole magnets are used to correct this deficiency. However, soon as this correction is done, induced higher-order aberrations become a major challenge. The cure is to find an optimal position for the hexapoles where the required field strengths are minimal by means of calculated hexapole coupling coefficients along the separator. It is a necessary condition that the induced aberrations are small. This procedure was also successfully applied at the present FRS, based on suggestions by K. Brown [5]. An example, of such a system of 12
DRAFT coupling coefficients is given in Figure 2.4.6. Applying hexapole and octupole corrections we succeeded to regain about 80 % of the first-order momentum resolving power at the central plane of the Pre-Separator. This result is confirmed by higher-order calculations performed with different ion-optical codes like GICO and COSY [42]. Figure 2.4.6: Example of most important 2 nd -order coupling coefficients ([x,aa], [x,aδ], [x,δδ]) calculated along the Pre-Separator. The magnetic elements of the Pre-Separator are schematically shown in the upper part of the plot. The hexapole magnets are marked in red colour. The additional foci at PF1 and PF3 can of course be shifted more towards the middle of the drift lengths between the subsequent dipole and hexapole magnets to improve the spatial separation of the primary beam from the selected fragments (see Figure 2.4.5). However, this reduces the optical resolving power at PF2 and thus the overall fragment separation power. Therefore the condition has to be matched to the experimental requirement. 13
Page 1 and 2: DRAFT Technical Design Report Super
Page 3 and 4: Preface DRAFT The International Fac
Page 5 and 6: Contents DRAFT 2.4.1 System Design
Page 7 and 8: DRAFT Table 2.4.1: Parameters of th
Page 9 and 10: DRAFT degrader stage which provides
Page 11: Pre-Separator DRAFT In order to acc
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
Page 65 and 66:
2.4.2.6 Current Leads DRAFT The cur
Page 67 and 68:
DRAFT Table 2.4.23 presents the lis
Page 69 and 70:
2.4.3 Power Converters DRAFT The po
Page 71 and 72:
SCR structure DRAFT Regarding high
Page 73 and 74:
a) Chopper circuit 3x400V b) Half b
Page 75 and 76:
External Control System Data transf
Page 77 and 78:
DRAFT Figure 2.4.77: Arrangement of
Page 79 and 80:
SuperFRS Power Supply Effective App
Page 81 and 82:
DRAFT The locations for the differe
Page 83 and 84:
DRAFT Figure 2.4.80: Beam induced f
Page 85 and 86:
DRAFT Figure 2.4.82: Two hybrids ca
Page 87 and 88:
DRAFT Figure 2.4.84: Left panel: TP
Page 89 and 90:
DRAFT extracted beams. Its use for
Page 91 and 92:
Time of Flight measurement DRAFT At
Page 93 and 94:
DRAFT together. Another option is t
Page 95 and 96:
DRAFT Figure 2.4.88: Pillow seal po
Page 97 and 98:
DRAFT Figure 2.4.90: Setup at the m
Page 99 and 100:
DRAFT An overview of the total vacu
Page 101 and 102:
2.4.7.4 Appendix - Technical Drawin
Page 103 and 104:
DRAFT Figure 2.4.96: Diagnostic cha
Page 105 and 106:
DRAFT Figure 2.4.98: Diagnostic cha
Page 107 and 108:
DRAFT Figure 2.4.100: Diagnostic ch
Page 109 and 110:
2.4.8 Particles Sources n/a 2.4.9 E
Page 111 and 112:
DRAFT movable, but BC3 must be able
Page 113 and 114:
DRAFT Figure 2.4.106: Spot size of
Page 115 and 116:
dE/dV [kJ/cm 3 ] 3 2 1 DRAFT includ
Page 117 and 118:
2.4.11.1.4 Design of the beam catch
Page 119 and 120:
DRAFT Figure 2.4.110: Calculated eq
Page 121 and 122:
DRAFT Figure 2.4.112: Location of b
Page 123 and 124:
DRAFT the carbon. Again mainly 7 Be
Page 125 and 126:
DRAFT maintenance of the carbon or
Page 127 and 128:
DRAFT material) and received the an
Page 129 and 130:
DRAFT commissioned in February 2005
Page 131 and 132:
DRAFT Table 2.4.28: Typical beam pa
Page 133 and 134:
DRAFT Figure 2.4.120: Surface tempe
Page 135 and 136:
DRAFT Figure 2.4.123: Schematic lay
Page 137 and 138:
DRAFT These results show that the i
Page 139 and 140:
DRAFT Like in the case of the rotat
Page 141 and 142:
DRAFT Figure 2.4.126: Left: Schemat
Page 143 and 144:
Page 145 and 146:
DRAFT Figure 2.4.129: Flow scheme o
Page 147 and 148:
DRAFT Since the weight of the cold
Page 149 and 150:
DRAFT With the cooling capacity spe
Page 151 and 152:
DRAFT Figure 2.4.134: Schematic of
Page 153 and 154:
S1 (a) Figure 2.4.136: (a) Zoom of
Page 155 and 156:
2.4.A Appendix DRAFT The appendix o
Page 157 and 158:
DRAFT experiment the EXL community
Page 159 and 160:
2.4.A1.3 Slow control and monitorin
Page 161 and 162:
DRAFT Figure 2.4.139: Architecture
Page 163 and 164:
DRAFT all FAIR accelerators will be
Page 165 and 166:
DRAFT source tier are split in two
Page 167 and 168:
DRAFT coupled from the ACS which is
Page 169 and 170:
DRAFT 2.4.A3.2 Work packages: descr
Page 171 and 172:
2.4.A3.2.4 Instrumentation Measurin
Page 173 and 174:
DRAFT this, planning a network layo
Page 175 and 176:
DRAFT 2.4.A3.3 Machine characterist
Page 177 and 178:
DRAFT installation of RALF was done
Page 179 and 180:
DRAFT The double ring synchrotrons,
Page 181 and 182:
DRAFT The first refrigerator, Cryo1
Page 183 and 184:
DRAFT shield 28874 + 25 g/s 22 bar
Page 185 and 186:
LHe storage Helium storage Helium s
Page 187 and 188:
Cryo2 Cryo3 CryoST DB 3 DRAFT Compr
Page 189 and 190:
DRAFT The cold connection will be m
Page 191 and 192:
DRAFT Measurements planned for each
Page 193 and 194:
DRAFT For magnets with less stringe
Page 195 and 196:
DRAFT The value, parameters, condit
Page 197 and 198:
DRAFT 3. Geometry tests For cryosta
Page 199 and 200:
DRAFT The Quench Heaters Tests has
Page 201 and 202:
DRAFT Figure 2.4.159: Photograph of
Page 203 and 204:
DRAFT The field properties listed i
Page 205 and 206:
DRAFT Figure 2.4.161: Schematic vie
Page 207 and 208:
DRAFT Figure 2.4.162: Scheme of the
Page 209 and 210:
2.4.A6.2.2 Shielding against direct
Page 211 and 212:
Page 213 and 214:
DRAFT Figure 2.4.165: An iron beam
Page 215 and 216:
DRAFT In a side view the flux of pr
Page 217 and 218:
DRAFT catcher 7 Be, 22 Na and 24 Na
Page 219 and 220:
DRAFT at the FRS (2·10 9 /spill as
Page 221 and 222:
DRAFT [1] H. Geissel et al., Nucl.
Page 223 and 224:
DRAFT [74] A. Fabich and J. Lettry,
show all

Technical Design Report Super Fragment Separator

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?