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  Bound beta decay experiment on Tl-205, Page 3 of 9  Not logged in ELOG logo
ID Date Author Category Subject
  41   Sat Mar 28 16:12:25 2020 ruijiu, raganDAQenter ESR and turn on the HV crate.
  42   Sat Mar 28 16:29:27 2020 Ragan, RuiJiu, EstherGeneralMalfunction of several ESR machines
The HKR crew informs us that several machines in ESR are showing malfunctions.
The on-call expert cannot be reached.

Update (16:36): On-call service has been informed.

Update (16:48): ESR cycle stopped.
  43   Sat Mar 28 18:11:13 2020 Alex, YuriGeneralno beam in the ESR
Yuri and Sergey (on phone) have investigated extensively the problem with having no beam in the ESR. The FRS has been checked and seems OK. The ESR is fine as well.
The problem seems to be the timing. Ths SIS and the ESR seem to be completely out of synchronization. The on-call service for the control system has been called. 
  44   Sun Mar 29 09:40:35 2020 ruijiuDAQrestart go4
go4 crush up. 
the problem is 
due to  mbs. 
restart mbs. 
see an error. 
restart again. 
the mbs and go4 
are working 
working. 
  45   Sun Mar 29 09:57:26 2020 ruijiuDetectorsthe HV of charged particle detector
        MHV1     MHV2
ch1:1st Sipad  4th 
Sipad
ch2:2nd Sipad  6th 
Sipad
ch3:3rd Sipad  DSSD
ch4:4th Sipad  CsI
  46   Sun Mar 29 10:09:14 2020 ruijiu start run e121_run_0237.lmd
Sergey and Yuri are tuning Tl beam. The particle number in ers is about 1e4. I(SIS)=5e8
run stop: after few minutes (garbage data)
  48   Sun Mar 29 11:12:00 2020 RaganRunsstart run e121_run_0239.lmd
Sergey and Yuri are tuning Tl beam. The particle number in ers is about 1e4. I(SIS)=5e8

some events on MWPC can be seen !
  49   Sun Mar 29 12:56:02 2020 Ragan, RuiJiuGeneralGood positive signals from MSCF
As we (RuiJiu and me) changed the jumpers of MSCF 1, 2,3 and 4 yesterday, now we see nice positive signals on picoscope.
Yuri and Sergey are still working on optimising the Tl fragments !
  50   Sun Mar 29 13:04:32 2020 Ragan, RuiJiuRunsrun file: 1298
The Tl fragments are being stacked (almost ~20 staacks) and tried to store nicely in ESR.
The plan is to see the number of contaminants on the inner detector (CsISiPHOS) after the gas jet is on (Ar gas jet) and minimise this number for different FRS settings !!

P.S. Prayers have magical powers :) :) 
  51   Sun Mar 29 13:05:36 2020 ruijiuDAQstart ntcap
IQ_2020-03-29_13-05-
56
SC_2020-03-29_13-05-
56
  52   Sun Mar 29 13:43:46 2020    
  53   Sun Mar 29 14:01:45 2020 ruijiu beam position on DSSD
move the detector 1cm 
outside.from 60mm to 
70mm.
left direction is 
outside. right direction 
is 
inside(close to beam).
the spot is moving from 
left to right.
  54   Sun Mar 29 14:29:13 2020 ruijiu e121_run_00240.lmd
s6 positon at 50mm.
  55   Sun Mar 29 18:41:31 2020 ruijiuAnalysisRatio between MPWC rate and DSSD rate
slit	Ratio	error
-1	18.64	0.4
-2	18.18	0.38
-3	20.85	0.5
-4	18.15	0.34
-5	17.44	0.31
-6	17.38	0.32
-7	17.82	0.32
-8	16.41	0.27
-9	18.51	0.37
  56   Sun Mar 29 18:55:19 2020 ShahabRunsFrequency list for identification
Here are some frequencies for identification of the fragments.

Center freq: 243.352675
span: 2 MHz

from left to right:

242.480175
242.645175
242.807675
242.855175
242.972675
243.247675
243.260175
243.300175
243.330175
243.342675
243.352675 --> largest peak possibly 205-Tl-81+ (not 100% sure)
243.415175
243.450175
243.555175
243.627675
243.752675
243.790175
243.807675
243.955175
244.117675
244.282675
  57   Sun Mar 29 20:32:20 2020 RaganGeneralTemplate for Pb halflive measurement
beam: 
energy: 

purpose: data with electron cooler current xx mA

Detector position (CsISiPHOS):  mm
Detector position (MWPC):       mm

run start at xx:xx , first file: run0xxx.lmd
run stop  at xx:xx , last file:  run0xxx.lmd

_______________________________________________________________________________

time: 

I_cooler =  mA



HV1
CH1 voltage:           V  
CH1 leakage current:   uA

CH2 voltage:           V  
CH2 leakage current:   uA

CH3 voltage:           V  
CH3 leakage current:   uA

CH4 voltage:           V  
CH4 leakage current:   uA

HV2
CH1 voltage:           V  
CH1 leakage current:   uA

CH2 voltage:           V  
CH2 leakage current:   uA

CH3 voltage:           V  
CH3 leakage current:   uA

CH4 voltage:           V  
CH4 leakage current:   uA


SIS particles before:           
ESR particles at injection:     
ESR particles after stacking:     
Target ON density:              


NTCAp file:
IQ_2020-03-27_21-02-31/0000xxx.iq.tdms
SC_2020-03-27_21-02-31/0000xxx.iq.tdms

copy and repeat the above (below the line) every 30 minutes
  58   Sun Mar 29 21:02:43 2020 ruijiuAnalysisdecay line of 205Tl beam
decay line of 205Tl beam with Ar gas jet target on and S6 slit at -8mm
Ar gas density~1e12 atoms/cm2
  59   Sun Mar 29 21:34:46 2020 RaganRunsFirst run
beam: 206Pb81+
energy: 400 MeV/u

purpose: data with primary beam for detector efficiency and cross-section calculations

Detector position (CsISiPHOS): 60 mm
Detector position (MWPC):     -10 mm

run start at 21:25 , run file: run0250.lmd
run stop  at 21:31 , close file:  run0250.lmd

_______________________________________________________________________________

time: 21:25

I_cooler = 177 mA

SIS particles before:  2E8        
ESR particles when gas jet is on:  3.6E6
Target ON density:  4.34E12        


NTCAp file:
SC_2020-03-29_21-27-57
IQ_2020-03-29_21-27-57

copy and repeat the above (below the line) every 30 minutes
  60   Sun Mar 29 21:39:27 2020 ruijiuAnalysisIonization cross section and capture cross section for h-206Pb + Ar
Ionization cross section = 1320 barn.
Capture cross section = 557+137+44.5=735.5.
sigma_Ion/sigma_cap=1.79
  61   Sun Mar 29 21:55:47 2020 RaganGeneralMWPC
Alex goes to Messhute to check the signals from MPWC. After he completes, we start with the measurements with the primary beam )
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