Technical Design Report Super Fragment Separator

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Fragment Monitoring DRAFT As example, the ring experiments only depend on the history of the pulses delivered to the CR/RESR/NESR complex, e.g.: • intensity, • charge and mass distributions, • contaminants, • deviations from nominal beam optics. They are of interest as for bunches all event-wise information gets lost in the transfer processes. However, this is also the information that is needed as slow control feedback data, which is described in the general NUSTAR-DAQ section. The collection of these data will be done by the local stand-alone Super-FRS DAQ together with an on-line analysis process that runs as data server for the Super-FRS’s slow control and the experiments bunch monitoring. The data server should provide a list of information it can deliver and provide a selection mechanism. Together with the information provided by the accelerator sections one is then able to monitor the full production process. This will also allow the accelerator controls to get specific feedback information from the experiments, allowing a very effective optimization of the setup data (see general NUSTAR-DAQ section). The necessary R&D will be done in close relation with the accelerator controls group. Tracking experiments Another class of experiments requires tracking ions through the separator, e.g.: • experiments performed at the final focus (MF4) of the Super-FRS, • experiments in the high energy branch R 3 B. Here the main issue is to record event-wise information about individual particles through the setup. As the selection process leads to substantial reduction factors (typ. 10 -6 PF4 � Caves, typ. 10 -3 MF2 � Caves), coincidences have to be build from the end of the beam line. This means, especially for the diagnostic detectors at the entrance of the main separator, that at rates of several 10 MHz the spread in velocities for different isotopes with similar Bρ will lead to overlapping events. This problem corresponds to the task of tracking particles with small yields while reconstructing their interaction vertices as in high energy physics. Here this is usually overcome by storing the data first in the front-end electronics while subsequently transferring and reducing it in a multi step triggering process. In our case this problem can be reduced to the problem of finding a plausible candidate in a certain time interval for an identified particle at one of the experiments. There are several solutions, as discussed below, which have to be evaluated in close collaboration with the planned experiments: i. a suitable reduction rate can be achieved already by demanding a coincidence window, where events are taken. The particular coincidences are evaluated off-line. ii. Coincidences are fully evaluated on-line. Option (i) can be realized in different ways. The conventional approach is to adjust cable delays to digitize all data from the experiment within a coincidence time (e.g. given by a gate). This is, however, also the most inflexible approach in view of the different DAQs that should be coupled 92
DRAFT together. Another option is to perform full data readout with subsequent selection of suitable events. This requires efficient way of addressing data into the past, corresponding to a certain delay time. The detector system at the two locations PF4 and MF2 should provide both absolute times for a time-of-flight measurement in addition a position in horizontal direction for MF2. This can be realized using a circular ring buffer to store timestamps and positions for the detector systems. Typically one would expect some 10...20 Bytes/event information here. Given a sampling frequency of about 100 MHz this corresponds to a data rate of 1-2 GByte/s for the buffer input. A similar system has been already realized for the mass measurements at the ESR, using commercially available oscilloscopes for sampling. We want to develop a dedicated readout board using contemporary FPGA designs. The design will be an extension of the existing GSI taquila system (see NUSTAR-DAQ section). The board should be synchronized by the common time distribution system (see NUSTAR-DAQ section). It should store all channels synchronously with the time-stamp given by the sampling clock into its circular ring buffer. The relative time within the samples is then given for every hit by the ADC value form the TAC. Such, a precision of 50-100 ps can be reached for the timing information. The digital delay can then be realized by reading out the circular buffer with a certain offset of the readout pointer as the data is stored in fixed time intervals. The reduced data rate is then expected to be a few MByte/sec (given by the suppression factor to the cave) only. Apart form this option we will look for other developments for the different FAIR experiments. In order to avoid long storage times, we foresee to place this readout system in the Super-FRS DAQ electronics-room, which should be nearby the R 3 B and LEB counting rooms. In that case signal propagation and beam propagation downstream would be aligned and the trigger information could be provided directly to the readout modules, thus saving additional delay times. Standard electronics The remaining particle identification and tracking can be realized, using a conventional trigger scheme. The existing VME readout scheme will be gradually updated with the upcoming novel developments described in the NUSTAR DAQ section. In order to come up with a fast readout scheme we will investigate the possibility already to reduce the data before building events to be written to mass storage for all detector systems (e.g. tracking detectors could already deliver pre-processed positions instead of raw times). We expect about 100 words of data at a rate up to 1-10 MHz corresponding to 100 MByte/sec up to 1 GByte/sec. 93
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DRAFT Technical Design Report Super
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Preface DRAFT The International Fac
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Contents DRAFT 2.4.1 System Design
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DRAFT Table 2.4.1: Parameters of th
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DRAFT degrader stage which provides
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Pre-Separator DRAFT In order to acc
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DRAFT coupling coefficients is give
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DRAFT Table 2.4.3: First-order matr
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DRAFT Main-Separator to the high-en
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DRAFT Table 2.4.5: Transmission T o
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DRAFT Figure 2.4.15: Resolution nec
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DRAFT Figure 2.4.17: Spectrometer m
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DRAFT Table 2.4.8: Design parameter
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DRAFT Figure 2.4.20: Side view of t
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DRAFT Figure 2.4.23: Coil cross-sec
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DRAFT Figure 2.4.25: Flux density d
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Figure 2.4.29: Assembly of two half
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DRAFT Figure 2.4.31: Cross section
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Figure 2.4.34: Sketch of the therma
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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: Time of Flight measurement DRAFT At
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
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DRAFT Figure 2.4.128: Schematic lay
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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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DRAFT Figure 2.4.164: Schematic lay
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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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Technical Design Report Super Fragment Separator

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