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
start web browser: http://psw407:8080 (PSI only!): Status page
(the following screenshots are taken from pc4244…)
NOT USE ‘Konqueror’ !!!! (only IE, Mozilla, or Firefox)
DO
Start a run
for autorun sequence: set autorun_active = 1 (if 0: only single run)
there are no ‘scans’ anymore!
Stop a run
Do not interfere the stopping procedure – wait until the pages refreshes and shows status
‘stopped’.
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 signal S
* -64.0 unit not Tesla !T
* -128.0 invalid channel number C
*
* status = I|B|L|N|W|S|C|E
* unit = T|F|U
Set Temperature
LTC21: Input: read values
Output: set value LTC21_Analog_Set_Point (K)
Set Flow
Demand = 3000 for T = 0 – 100 °C,
set Demand = 10000 for cooling down,
base temp. ???
History
ODB: DO NOT TOUCH! – discuss with Instrument Scientist first
Start frontends from terminal 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 [IPS120 SC] Program IPS120 SC on host pc4244 stopped
09:48:00 [alc_fe] Program alc_fe on host pc4244 stopped
09:48:00 [HALL_SCfe] Program HALL_SCfe on host pc4244 stopped
09:48:00 [ODBEdit1] Cannot shutdown client "NMR_SCfe", please kill manually and do an ODB cleanup
09:48:00 [SampleT_scfe] Program SampleT_scfe on host pc4244 stopped
09:48:00 [LTC21 SC] Program LTC21 SC on host pc4244 stopped
09:48:00 [BeamLine SC] Program BeamLine SC on host pc4244 stopped
09:48:00 [Logger] Program Logger on host pc4244 stopped
09:48:00 [mhttpd] Program mhttpd on host pc4244 stopped
09:48:00 [RVC200 Frontend] Program RVC200 Frontend on host pc4244 stopped
09:48:00 [Analyzer] Program Analyzer on host pc4244 stopped
odbedit exit status 0
Now I do an ODB cleanup...
Killing processes in case that odbedit failed to stop them ...
Process with pid \003256\\ (mhttpd) ...killednecho -n Process with pid \003278\\ (nmr_scfe) ...
killedn
killproc exit status 0
killing mozilla...
mozilla-bin: no process killed
killing opera...
opera: no process killed
Cleaning up shared memory segments for user l_musr_alc ...
Shared memory segment id 65537 ...
resource(s) deleted
Shared memory segment id 98306 ...
resource(s) deleted
Shared memory segment id 131075 ...
resource(s) deleted
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
0x4d05c027 0 l_musr_al 666 1
0x4d05c028 32769 l_musr_al 666 1
0x4d05c029 65538 l_musr_al 666 1
0x4d05c080 98307 l_musr_al 666 1
0x4d05c1c0 131076 l_musr_al 666 1
------ Message Queues -------key msqid owner perms used-bytes messages
[l_musr_alc@pc4244 alc]$
(eventually run twice or more… until no midas daemons left)
then it looks like:
[l_musr_alc@pc4244 alc]$ alc_mcleanup
Midas cleanup procedure for experiment ALC...
Stopping MIDAS clients...
No clients found
odbedit exit status 0
Now I do an ODB cleanup...
Killing processes in case that odbedit failed to stop them ...
killproc exit status 0
killing mozilla...
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
0x4d05c027 0 l_musr_al 666 1
------ Message Queues -------key msqid owner perms used-bytes messages
[l_musr_alc@pc4244 alc]$
alternatively: start midas daemons one by one without X-server:
[l_musr_alc@pc4244]$
[l_musr_alc@pc4244]$
mhttpd -p 8080 -D
alc_fe -D
[l_musr_alc@pc4244]$ ips120_scfe -D
[l_musr_alc@pc4244]$ ltc21_scfe -D
[l_musr_alc@pc4244]$ samplet_scfe -D
[l_musr_alc@pc4244]$ hall_scfe -D
[l_musr_alc@pc4244]$ nmr_scfe -D
[l_musr_alc@pc4244]$ rvc200_scfe -D
[l_musr_alc@pc4244]$ bl_scfe -D
[l_musr_alc@pc4244]$ analyzer -D
[l_musr_alc@pc4244]$ mlogger -D
Separator: vncviewer sepii:0, pw: exhalle
- if only black screen appears use rdesktop sepii, user: halle, pw: exhalle
under winXP: Remote Desktop Connection (All Programs – Accessories –
Communications)
for HV = 150 kV: SEP = 746
The beamline setting is named ALC2005_1st_period.set.
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 = 1.5000; from = 1.5500; to = 2.3000; step = 0.0005
!Temperature (cold finger) : T1 = 346.503 K; dT1 = 0.029 K
!Temperature (sample plate): T2 = 350.154 K; dT2 = 0.063 K
!Preset Count: 1500000
!Group of preset detectors: 0x00000004
!Group of forward detectors: 0x007f0000
!Group of backward detectors: 0x000007f0
!
!
!
!
!
!------------------------------------------------------------------------------! B_IPS asym a_err I_IPS B_NMR B_Hall T1 T2 reserve[0..7] scaler[0..31]
!-------------------------------------------------------------------------------
1.5500 0.11370 0.00031 22.79400 1.5481 1.5480 346.629 350.034 0 0 0
0 0 0 0 0 0 9042 1601696 0 915025 829539 925851
756272 827958 883336 764988 0 0 0 0 0 862837 751539 743396
512164 508840 602534 716321 0 0 0 0 0 0 0 0
0
1.5505 0.11459 0.00030 22.80140 1.5485 1.5480 346.660 350.027 0 0 0
0 0 0 0 0 0 9149 1620915 0 927877 842968 938642
767071 839195 895571 777035 0 0 0 0 0 872329 758847 754103
518703 514314 612899 725841 0 0 0 0 0 0 0 0
0
scaler[28] – [31] contains the sums of all detector counts in fw and bw generated by an
FC103 ‘OR’ unit. This avoids counting of double hits.
sb_pos = scaler[28];
sb_neg = scaler[29];
sf_pos = scaler[30];
sf_neg = scaler[31];
The resulting asymmetry and error are written in reserve[0] – [3] for pos. and neg.
electric field applied (asy_pos, errasy_pos, asy_neg, errasy_neg). (Only negative
polarity if no electric field clock signal present!).
AFS data path:
/afs/psi.ch/project/bulkmusr/data/alc/ti/
defined as DATAPATH on pc5145: cd $DATAPATH
visualize, e.g., gnuplot: plot “alc_05_0123.dat” u 1:2:3 w e
use Root on pc5145:
cd /home/l_musr_alc/ALC
root -l DoALC.C
[] load();
[] plot();
[] combine();
[] save();
Appendix: Some ODB entries
Ip_min is the minimum required beam currenton 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 beamblocker is closed).
TestRun = ‘n’ writes datafile ‘alc_05_NNNN.dat’
TestRun= ‘y’ writes ‘test_alc_05_NNNN.dat’
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 channels used for the preset counting
register in hex form. In the above example this is the proton current (equivalent to
counting for a certain number of incoming muons). 3
rd
channel has bitmask 0100,
represented by 0x4 in hex code.
preset_value is the number of counts per field points in the preset_channel. 1’500’000
counts in the proton beam channel correspond to 10 seconds measurement time at an
average beam of 1.5 mA. Keep in mind that the scaler is read only every 3 seconds…
Forward_Detectors, Backward_Detectors is the bitmask for the detectors in hex code.
FW: 0x7F0000 == 0111 1111 0000 0000 0000 0000 == channels 17 – 23 out of 32,
BW: 0x7F0 == 0000 0000 0000 0111 1111 0000 == channels 5 – 11 out of 32.
Channel_norm_time
scaler[n] (#n) is number of the channel used for the clock signal
(starting at channel 0, here in the second channel (
and Rate_norm_time is the clock frequency (1 kHz).
Contacts:
robert.scheuermann@psi.ch phone: 3465
alexey.stoykov@psi.ch phone: 3200
πE3 mobile phone: 5883
scaler[1]))
ALC counting room: 3025
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