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DESCRIPTION

Fragmentation of very neutron-rich projectiles around 132Sn


This experiment aims to isotopically identify and determine the production cross sections of residual nuclei in the fragmentation of very neutron-rich nuclei around 132Sn produced in the fission of 238U primary projectiles. These measurements will provide valuable information about a possible two-step reaction scheme (fission-fragmentation) to optimise the production of extremely neutron-rich nuclei in future radiaoactive bema facilities (EURISOL,FAIR). At the same time, the interaction cross section, projectile proton- and neutron-pickup cross sections and proton removal cross sections of these medium mass neutron-rich isotopes will be measured. These observables will allow to investigate basic ground state properties of those extremely nuclei, like density distributions and/or binding energies.

The experiments are performed at the SIS synchrotron accelerator at GSI which delivers the 238U beam with an energy of 1 A GeV. The beam impinge into a Pb target and the 132Sn produced by fission is isotopically identify by using the first part of a magnetic spectrometer Fragment Separator (FRS). The 132Sn produced impinges on a second reaction target of berylium for the identification of the fragments on the second part of the spectrometer.

PARTICIPANTS

Participants

List of participants

Contact list:

TPCs Peter-Rudo 2967-2966
FRS Jose Benlliure 2973/+34647344121
Andreas Heinz 0607134247
Julien Taieb 2956/+33662752725
Enrique Casarejos 2964
Bertran Blank 2958
DAQ-Online David Perez +34646672060
Online Hector Alvarez +34677602505
Martin Gascon +34656302277
Others Agnieszka Trcinska 2972/+48502563407

Shift Plan for S294 experiment

Team members:

  • A: B. Blank, A. Kelic, S. Lukic , V. Fohr, M. Heil
  • B: J. Benlliure, D. Pérez, K. Subotic, D. Dragosavac
  • C: A. Heinz, H. Alvarez, F. Montes, A Aprochazca, P Stuman
  • D: J. Taieb, M. Gascon, A. Trzcinska, R. Pleskac, M. Stanoiu

    		•  0:00 - 8:00 8:00 - 16:00 16:00 - 24:00
    Tuesday 28
    		A B
    Wednesday 29 C D A
    Thursday 30 B C D
    Friday 1 A B C
    Saturday 2 D A B
    Sunday 3 C D A
    Monday 4 B C D
    Tuesday 5 A B C
    Wednesday 6 D

    Thursday 7 A

    Friday 8 B

    TECHNICAL INFO

    Technical Information

    Filesheet (PDF)
    Experimental Setup
    FRS ion optics

    Targets & Degraders

    Detectors and electronics.

    Data acquisition

    FRS handling

    • Before starting (loading ion-optical files, starting different programs ??)
    • Setting the FRS (loading a reference setting and scaling)
    • Saving a setting
    • different programs  SD, DI, setting current grids, change the seetram sensitivity...etc...??)
      How to get the status of all devices in the beam line

    SEETRAM calibration

    S294  Experimental Setup

    Layers of matter for S294

    TARGET SETUP

    Material Target thickness TS1ET5HS TS1ET5VS
    Be 1036 24.47 -313.1
    Pb 405 70.78 -289.71
    Pb 649 70.87 -312.91
    Pb 1534 71.06 -359.31

    EXPECTED PRODUCTION RATES

    Beam intensity 108 pps, cross sections Be(0.85 mb), Pb(10.5 mb)

    Material Thickness Rate (pps)
    Be 1036 5961.2
    Pb 649 1984.5
    Pb 1534 4683

    For further information about targets and degraders, please check the official technical FRS page here.

    Detector settings for S294

    Current grids

    CG01 100V
    CG02 100V

    MUSIC chambers  (MUNICH)

    Anode value?
    Cathode 8000 V

     

    Chamber Anode Amplifier gain Threshold
    MUSIC 1 1 value? value?
    MUSIC 1 2 value? value?
    MUSIC 1 3 value? value?
    MUSIC 1 4 value? value?
    MUSIC 1 5 value? value?
    MUSIC 1 6 value? value?
    MUSIC 1 7 value? value?
    MUSIC 1 8 value? value?
    MUSIC 2 1 value? value?
    MUSIC 2 2 value? value?
    MUSIC 2 3 value? value?
    MUSIC 2 4 value? value?
    MUSIC 2 5 value? value?
    MUSIC 2 6 value? value?
    MUSIC 2 7 value? value?
    MUSIC 2 8 value? value?

    Scintillators

    Plastic PMT voltage Signal output CF threshold
    SCI-11U 1500 value? value?
    D6 541 value? value?
    D7 422 value? value?
    D8 190 value? value?
    SCI-11D 1500 value? value?
    D6 541 value? value?
    D7 422 value? value?
    D8 190 value? value?
    SCI-21L 1600V value? value?
    SCI-21R 1600V value? value?
    SCI-41L 1600V value? value?
    SCI-41R 1600V value? value?
    SCI-41U 1600V value? value?
    SCI-41D 1600V value? value?

    MultiWire PCs

    Chamber HV
    MW 11 A 2300V
    MW 21 A 3000V
    MW 22 A 2700V
    MW 31 A 2000V
    MW 41 A 2700V
    MW 42 A 2100V

    TPCs

    Chamber HV
    TPC 1 value?
    TPC 2
    		 value?
    TPC 3
    		 value?
    TPC 4
    		 value?
    TPC 5
    		 value?
    TPC 6
    		 value?

    S294 DAQ

    How to start the DAQ

    1. Login as profi user on lxg1018 (ask for the password). The programs for the DAQ are in te directory:

      /lynx/Lynx/frs/usr/profi/mbsrun/s294

    2. login as profi user into x86-8 (ask for the password) and go to the correct directory:

      cd mbsrun/s294

      and then type:
      1. resa
        this command will reset all runing processes.
      2. net600
        this command is to watch for all processes. Repeat the command until no processes run anymore.
      3. prm
        this command will invoke mbs.
      4. @startup
        to start DAQ
      5. sta acq

      If you want to dump event type

      typ ev -v

    3. From another terminal on lxg1018 type:

      mrevserv x86-8
      this command will launch the server

      To see the trigger rate, login into x86-8 as rising and type:

      rate

      To see the file rate login from another window into x86-8 and type:

      rate -fi

    How to start rfio

    1. Type:

      ssh -l risrfio lxfs32

      Give the password (ask for it) and go to the directory:

      /rida03/s294

      where to store the data files (under linux /d/rising03/s280), there you find three different subdirectories where you can store the lmd files:
      calib/ test/ data/
    2. then type:

      rawDispRFIOn

    3. go back to the mbs section, where the DAQ was started and type:

      connect rfio lxfs32 -disk

    4. now you can open an lmd file and from the mbs type:

      open file /rida03/s294/test/ first=1 -auto size=100 -rfio

      files with 100 MB will be automatically created with the increment run number.
    1. Login as profi user on lxg1018 (ask for the password). The programs for the DAQ are in te directory:

      /lynx/Lynx/frs/usr/profi/mbsrun/s294

    2. login as profi user into x86-8 (ask for the password) and go to the correct directory:

      cd mbsrun/s294

      and then type:
      1. resa
        this command will reset all runing processes.
      2. net600
        this command is to watch for all processes. Repeat the command until no processes run anymore.
      3. prm
        this command will invoke mbs.
      4. @startup
        to start DAQ
      5. sta acq

      If you want to dump event type

      typ ev -v

    3. From another terminal on lxg1018 type:

      mrevserv x86-8
      this command will launch the server

      To see the trigger rate, login into x86-8 as rising and type:

      rate

      To see the file rate login from another window into x86-8 and type:

      rate -fi

    How to stop DAQ

    • If you are not in r3-8, move to it typing in the mbs session:

      set disp r3-8

      and type:

      stop acq

    • In case you want to logout form the mbs first look for the terminal where the remote event server was started and stop it with Ctrl^C and after, go back to the mbs session and type:

      @shutdown

    S294 Go4 On line analysis program

    How to start the Go4 analysis program

    1. Login as profi into lxg1018 and go to the directory where go4 package is:

      /d/frs01/profi/s294/go4

    2. to start go4 type:

      go4

    3. Click on the button Launch an analysis
    4. In the Start client window set:
      • Operation mode: As client
      • Host: lxg1021 (This machine is the one dedicated to online)
      • Name: MyAnalysis
      • Check that the directory is /d/frs01/profi/s294/go4
      • Click on Start button
    5. In the Analysis configuration window set:
      • Event source: Remote Event Server
      • Name: lxg1018
      • Click on Submit+Start button
    6. In the right browser of the GUI double click on Analysis icon where you will find the standard Go4 folders

    How to stop Go4 on line analysis program

    1. If you want to stop the online analysis click on the stop button
    2. If you want to close the online analysis click first stop and then click on disconect runing analysis

    S294  Parameter List

    Loading ion-optical calculations

    On AXP316 (Program SD):

    • click on SONDEROPTIONEN
    • click on THEORIEWERTE SETZEN (Magnete)
    • click on Prg Start

      • The list of theoretical values for magnets and quadrupoles appears
    • choose your theoretical data file by clicking
    • click on Anzeigen to check that the file corresponds to what you expect

      • (the magnets values appear on the window created by the programme)
      when you are sure this is The file you wanted,
    • click on setzen to set the currents on the magnets.
    • then got to programme MGSKAL to scale all magnets (from SIS to S4).

    Change of FRS setting

    Program SRMAG:

    1. go to MENU
    2. go to DATENSATZE
    3. go to SUCHKRIETERIEN if 1st loading and choose the reference file
    4. go to DATENSATZE LADEN to load it
    5. go to SAVE SETZEN
    6. go to MENU

    Choose the FRS section to be scaled (program MGSKAL):

    1. go to MENU
    2. go to AUSWAHL DER GRUPPE to choose the section
    3. choose the section !

    Scale the section (program MGSKAL):

    1. go to MENU
    2. go to SKALIEREN UND SETZEN
    3. go to SKALIEREN MIT FACTOR
    4. enter the scaling factor from LIESCHEN calculations

    goto number 3 until all FRS is scaled.

    print the magnet status (program SD):

    1. click with the mouse on STATUS
    2. glue the magnet status on logbook

     

    Save of FRS setting

    Use program SRMAG:

    1. go to ABSPEICHERN (return)
    2. go to the line which describes your experiment (return)
    3. check there is no feller in the reading (return)
    4. type okay (Do)
    5. give a commentar on beam and beam line status
    6. give initials of people in shift
    7. give a SLUECHELWORT which will be the name used to call this setting
    8. type (Do) to save the data
    9. go to DATENSATZE

    FRS calibration

    Calibration Protocol (DOC file).

    S294 settings

    S2
    S4
    Intensity/spill
    Prod. Target
    S2 Target
    S2 rate
    S4 rate
    Time (h)
    Statistics
    Lieschen file
    124Sn
    124Sn
    3.5E+7
    Pb 649 mg
    IN
    1736
    1010
    1
    23930
    124Sn
    124Sn
    3.5E+7
    Pb 649 mg
    OUT
    1736
    1010
    1
    7206
    Download
    124Sn
    123In-122Cd
    3.5E+7
    Pb 649 mg
    IN
    1736
    1010
    2
    368/4
    124Sn
    124Sb
    2E+8
    Pb 649 mg
    IN
    1736
    952
    8
    169
    126Sn
    126Sn
    1.3E+7
    Pb 649 mg
    IN
    2119
    1200
    1
    13974
    126Sn
    126Sn
    1.3E+7
    Pb 649 mg
    OUT
    2119
    1200
    1
    2744
    Download
    126Sn
    125In-124Cd
    2E+7
    Pb 649 mg
    IN
    3260
    1270
    2
    347/4
    126Sn
    126Sb
    5E+7
    Pb 649 mg
    IN
    8150
    1030
    8
    69
    128Sn
    128Sn
    1E+7
    Pb 649 mg
    IN
    1930
    1130
    1
    11334
    128Sn
    128Sn
    1E+7
    Pb 649 mg
    OUT
    1930
    1130
    1
    2202
    Download
    128Sn
    127In-126Cd
    2E+7
    Pb 649 mg
    IN
    3260
    1440
    2
    733/9
    128Sn
    128Sb
    5E+7
    Pb 649 mg
    IN
    9650
    1100
    8
    74
    130Sn
    130Sn
    1.5E+7
    Pb 649 mg
    IN
    1400
    1250
    1
    31920
    130Sn
    130Sn
    1.5E+7
    Pb 649 mg
    OUT
    1400
    1200
    1
    5641
    Download
    130Sn
    129In-128Cd
    2E+7
    Pb 649 mg
    IN
    2800
    1080
    2
    707/9
    130Sn
    130Sb
    1E+8
    Pb 649 mg
    IN
    14000
    1080
    8
    283
    132Sn
    132Sn
    5E+7
    Pb 649 mg
    IN
    2500
    1350
    1
    64356
    132Sn
    132Sn
    5E+7
    Pb 649 mg
    OUT
    2500
    1350
    1
    12214
    Download
    132Sn
    131In-130Cd
    5E+7
    Pb 649 mg
    IN
    2500
    1150
    2
    1042/13
    132Sn
    132Sb
    6E+8
    Pb 649 mg
    IN
    30000
    714
    8
    1010
    132Sn
    129Ag-128Pd
    1E+99
    Be 1036 mg
    IN
    33750
    less 1
    72
    121/2
    134Sn
    134Sn
    2E+8
    Be 1036 mg
    IN
    2590
    1380
    1
    17042
    134Sn
    134Sn
    2E+8
    Be 1036 mg
    OUT
    2590
    1380
    1
    3467
    Download
    134Sn
    133In-132Cd
    2E+8
    Be 1036 mg
    IN
    2590
    1210
    2
    259/3
    134Sn
    134Sb
    1E+99
    Be 1036 mg
    IN
    12950
    3
    8
    109

    ANALYSIS INFO

    MAIN RESULTS