 Mon May 23 15:58:30 2011, Mike Bentley, Routine, General, End of Shift summary
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OK - summary of events during this shift.
1.TDCs. We have been sorting offline, and we have now established that between run 66 and run 79, the TDC mode was incorrectly set (not in common |
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Tue May 24 08:18:23 2011, Mike Bentley, Routine, General, end of shift summary
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We have been running smoothly all night. Only problem is that the DAQ occasionally does not start properly after a stop-go. The dead-time goes
to nearly 100%. This happened twice in the night,. and a second stop-go did the trick. Needs looking at.
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Tue May 24 20:45:12 2011, Mike Bentley, Other, General, Update for during the day 24th May, wednesday 
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Update:
W decided at 8.00 to stop, check the tune, retune and get back going. This has nearly, finished but it is a very long process indeed - note for
future - this takes AT LEAST 12 hours, if one is systematic about it. |
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Wed May 25 18:05:55 2011, Mike Bentley, Routine, General, Report on day shift and changed energy - now at 3.98 MeV/u
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All ran smoothly.
As a test, ran for a short period at 1200 midday to run without S2-2 in the trigger. Finished that at 1339.
After discussion with Alison, Alex, Brian, Chris - we decided to change energy to 3.98 MeV/u. This started at 1340. |
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Sat May 28 07:46:09 2011, Lars Martin, Routine, General,
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Beam current dropped to 85 epA at the start of the shift, operator checked for reasons and decided to change
stripper foil. That brought the current back up, but it started decreasing again, so from run to run slits were
gradually opened further to keep FC0 current at about 100 epA.
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Wed Jul 18 08:29:03 2012, Jessica Tomlinson, Other, General, Analysis update
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Energy calibration for S2-2 was done using the pulser data (set 6 of the pulser runs) to calculate the offsets and alpha run R186 to calculate
the gains and constant. For S2-1 pulser walkthrough 6 was also used to calculate the offsets and the gains calculated using run 31 which is 21Ne beam scattering
from Au/C target. The constants were then calculated by fitting a least squares fit to the alpha peaks from run 186 and the gold scattering peak from run |
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Mon Sep 24 07:16:18 2012, Jessica Tomlinson, Other, Other, Analysis update
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Energy vs Time plots
I updated the monte carlo written by Alex to include time and also created new SRIM tables for 250 Torr rather than |
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Fri Nov 16 07:12:32 2012, Jessica Tomlinson, Other, General, 4.11 MeV/u analysis 6x
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I have sorted the 4.11MeV/u data runs (the ones which had the common stop mode on the TDCs) and applied the following cuts:
There must be a hit registered in each side of the detectors.
equal energy must be deposited in both sides of the detectors.
Low energy cut is applied to each detector.
Must have a hit in the TDC for the front strips.
Must have multiplicity |
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Fri Nov 16 07:23:26 2012, Jessica Tomlinson, Other, General, S2-1 plot that would fit on previous elog
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Attachment 1 shows S2-1 energy vs time with a gate on energy in S2-2 being greater than 9MeV i.e. See previous elog also posted today for explanation.
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Tue Dec 4 05:40:10 2012, Jessica Tomlinson, Other, Other, analysis - single strip E vs t 6x
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I have attached some single strip energy vs time plots to show that the structure seen in the collective E vs t plots is in each strip.
Attachments 1 and 2 show two different strips in S2-2 with no cuts. You can see that the 3 loci are different to one another in the single strips
as well as in the combined S2-2 E vs t plot shown in attachment 3. Attachement 3 is plotted after applying the following cuts: equal energy in the front |
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Fri Jan 11 06:56:01 2013, Jessica Tomlinson, Other, General, multiplicities, hit patterns and good hits in an event
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I have attached a pdf of a series of slides with some multiplicity and hit pattern plots on, also a list of cuts. As well as this I looked at how many
'good hits' (explained in pdf) I am getting per event.
Before Christmas I found that the code was not clearing the raw arrays read in by MIDAS and so unless a new piece of data filled the array channel |
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Tue May 24 23:59:16 2011, Jennifer Fallis, Lars Martin, Routine, General, Shift summary
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Buncher problem was resolved around 22:00 (driver module needed to be replaced).
Checked current on FC0 and trigger rate, around 4000 presented. We then started a run, only got 20 acquired,
stoped and restarted a run, then all relevant numbers seemed normal.
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Sat May 28 10:07:44 2011, Jamie Brown, and Mike Bentley, , , Plan for last day
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1) PD run with gas (250Torr) - done
2) Pump down to 50 Torr - done
3) PD run - done |
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Mon Apr 4 01:34:54 2011, Jamie Brown, Routine, General, Proposal
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| See attached. |
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Mon May 16 21:14:19 2011, Jamie Brown, , , Broken solder on PD2
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| As you can see... |
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Tue May 17 12:32:13 2011, Jamie Brown, , , Thick carbon target
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The thick carbon target, to be used for background runs for the thick CH2 measurement was supplied by Marek.
He measured it to be 120um thick (with a micrometer), and says it's low density carbon (1.03g/cm3).
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Sat May 21 18:25:36 2011, Jamie Brown, , , Beam spot
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Mon May 23 02:16:32 2011, Jamie Brown, , , End of run summary
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Plan for shift was to increase trigger thresholds on S2-1 and S2-2 to cut out the low energy "stuff" which is dominating our trigger rate,
and preventing us from increasing the beam current. S2-1 thresholds were at 10mV and S2-2 at 25 and 30mV.
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Wed May 25 22:45:42 2011, Jamie Brown, , , Leakage current in S2-1
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At approximately 7pm, noted that trigger rate in S2-1 had dropped by factor of ~20. Detector had tripped off due to leakage current reaching 8uA - spotting
this was delayed as camera (or web-browser) monitoring currents had frozen. Current trip point has been increased to 12uA, and the beam intensity lowered
to try to preserve the detector through out the night. |
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Thu May 26 12:53:48 2011, Jamie Brown, , , H2 fill and vent procedures
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Please note that these procedures are not perfect and other small operations not listed may need to be carried out. Some mistakes may still exist in
these procedures which could introduce significant risk if not spotted and corrected during the process. These should only be carried out by people confident
they understand the system and the purpose of each step, giving due consideration to each step to ensure it is appropriate and safe. |