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Midas SR35 manual

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Table of contents for the manual

  • Page 1

    MIDAS experiment „alc“ USER MANUAL SR35, 05.07.2006 Data acquisition is running on psw407 (DELL Power Edge 2600). AFS users can logon to pc5145, the local user account is l_musr_alc . Data files are stored locally on psw407 in /home/l_musr_alc/exp/alc and automatically copied to /afs/psi.ch/project/bulkmusr/data/alc/ti[...]

  • Page 2

    start web browser: http://psw407:8080 (PSI only!): Status page (the following screenshots are taken from pc4244…) DO NOT USE ‘Konqueror’ !!!! (only IE, Mozilla, or Firefox)[...]

  • Page 3

    Start a run for autorun sequence: set autorun_active = 1 (if 0: only single run) there are no ‘scans’ anymore![...]

  • Page 4

    Stop a run Do not interfere the stop ping proced ure – wait until the pages refreshes and shows sta tus ‘stopped’.[...]

  • Page 5

    Set Magnet change Demand value read Hall probe read NMR probe - field >= 0.0 * - probe is locked * - readout unit is Tesla * - sum of returned errors (returned value < 0.0) * status unit * -1.0 BUS DRIVER I/O TIMEOUT I * -2.0 BUS DRIVER ERROR B * -4.0 not in state LOCKED !L * -8.0 state NOT LOCKED N * -16.0 state WRONG W * -32.0 state NMR sig[...]

  • Page 6

    Set Temperature LTC21: Input: read values Output : set value LTC21_Analog_Set_Point (K)[...]

  • Page 7

    Set Flow Demand = 3000 for T = 0 – 100 ° C, set Demand = 10000 for cooling down, base temp. ???[...]

  • Page 8

    History[...]

  • Page 9

    ODB: DO NOT TOUCH! – discuss with Instrument Scientist first Start frontends from term inal by running the command alc_start_midas Shutdown all frontends: alc_mcleanup [l_musr_alc@pc4244 alc]$ alc_mcleanup Midas cleanup procedure for experiment ALC... Stopping MIDAS clients... 09:48:00 [ODBEdit] Program ODBEdit on host pc4244 stopped 09:48:00 [IP[...]

  • Page 10

    mozilla-bin: no process killed killing opera... opera: no process killed Cleaning up shared memory segments for user l_musr_alc ... Cleaning up semaphores for user l_musr_alc ... ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x00000000 0 root 777 49152 1 ------ Semaphore Arrays -------- key semid owner perms nsems[...]

  • Page 11

    Separator : vncviewer sepii:0 , pw: exhalle - if only black screen appears use rdesktop sepii , user: halle, pw: exhalle under winXP: Remote Desktop Connec tion (All Programs – Accessories – Communications) for HV = 150 kV: SEP = 746 The beamline setting is nam ed ALC2005_1st_period.set .[...]

  • Page 12

    Data written as ASCII file : alc_05_NNNN.dat (run number NNNN) format: 19 header lines followed by data, lines containing 48 coloumns each !File: /home/l_musr_alc/exp/alc/alc_05_0270.dat !Run : 270 !Start/Stop time: 01:25:32 (30-04-2005) / 06:55:08 (30-04-2005) !Comment: cell 107, 15% DHTAC / 50 mole% ortho-chlorobenzoate, 35C !Field [T]: prescan =[...]

  • Page 13

    Appendix: Some ODB entries Ip_min is the minimum required beam current on Target E in mA. Measurement is paused when the current is lower. rate_min is the minimum required positron rate in the sum of the backward counters (this makes sure that the run is automatically paused when the beam blocker is closed). TestRun = ‘n’ writes datafile ‘alc[...]

  • Page 14

    Ip_channel is the channel number (starting at 0, in the above example this is the third channel) of the proton beam current signal, 100 kHz correspond to 1 mA. preset channels is the bitmask for the scaler cha nnels used f or the preset counting register in hex form. In the above example this is the proton current (equivalent to counting for a cert[...]