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.
The pressure inside TUDA is slowly creeping down (~0.3 torr/h), maybe a small leak in the window. It's not the
hall cooling down, the gas temperature actually rose in the meantime.

No major problems presented, A pluser walk was performed at the begining of the shift run161 S2-1 front, run162 S2-2 front, run163 S2-1 back and run165 S2-2 back.

Runs 166, 168, 169 are void due to bad scaler reading

Two times the control room reported the dipole magnet tripped but beam was recovered within few minutes. FC0 readings range 150-120epA

S2-1 L. current 17.60uA @ 16:00 and 18.85uA @ 23:10

Continuation of yesterday's test with c. 300mBar of He
in the TUDA chamber.

      Bourdon    MKS        S2 preamp
                 Baratron   Thermocouple
      (mBar)     (Torr)     (deg C)

09.31 300        222.9      +22
10.30 300        223.1      +22
11.29 300        223.2      +22
12.29 300        223.3      +22
13.26 300        223.3      +22
14.27 300        223.5      +22
15.27 300        223.6      +22
16.28 300        223.7      +22
17.28 300        223.8      +23
18.28 300        223.9      +23
19.27 300        223.9      +23
20.27 300        223.9      +22

RAL109 Shaping Amplifier Modules

                    RAL109     Nominal  Nominal  Minimum
                    Resistor   FSR      Gain     LLD
Detector  Channels  DIP        (MeV)    (keV/ch) (keV)

S2-1 p+n  0-47      3.3k       71.4     18.6     1300
S2-1 n+n  48-63     3.3k       71.4     18.6     1300
S2-2 p+n  64-111    1k         33.3      8.7      600       
S2-2 n+n  112-127   1k         33.3      8.7      600
W p+n     128-143   1k         33.3      8.7      600
W n+n     144-159   1k         33.3      8.7      600
PDs       160-175   10k        183      47.7     3400

All RAL109 LLDs set to ~10mV (minimum)

CAEN V560 Scalers

Channel

0       Triggers
1       Triggers accepted
2       1kHz clock
3       Ortec 439
4       Pulser
5
6
7

8       S2-1 OR ch 0-15
9       S2-1 OR ch 16-31
10      S2-1 OR ch 32-47
11      S2-1 OR ch 48-63
12      S2-2 OR ch 64-79
13      S2-2 OR ch 80-95
14      S2-2 OR ch 96-111
15      S2-2 OR ch 112-127

16      W OR ch 128-143
17      W OR ch 144-159
18      PD OR ch 160-175
19
20
21
22
23

24
25
26
27
28
29
30
31

attached

note. s2 position in fig. 1 is wrong, should be 360mm.

27/06/11 - final version of safety report added (produced just before the experiment began).

Work permit (2011-4-11-3) was requested to vent SEBT1 upstream of TUDA chamber
and HERACLES to permit line-of-sight for alignment of TUDA chamber. Note that
Facility Coordinators are Lothar Buchmann/Pat Walden/Sky Sjue and Gordon Ball/Randy
for TUDA and HERACLES respectively. 

Wipe test was performed by Tom Davinson (PPE: respirator and gloves).
Samples checked by Fiona Holness RPG - check OK.

 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.

S1287 data files R1_*.gz to R100_*.gz transferred from directory
tuda2:/data2/data/S1287 to directory tuda3:/data3/data/S1287

This releases c.18Gb of space in the tuda2:/data2 filesystem

Attached is a spreadsheet summarizing all the run information from the experiment.

Attached. Book 13 is split into 4 sections as otherwise the file is too big for the elog to accept.

 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.

Pumped out H2, Marco steered with low intensity beam. He optimized on our PD2 with the 3mm collimator, then he observed the spot on the scintillator. He believed (as do I) that it looked as good as it did after the high-intensity tune yesterday. Beam spot blown up a bit, as before, but very well centred. picture from iphone below.

Did a run without gas, then filled, then got going on H2. H2 run started 1730. Thus, 4 hours for beam change and low-intensity tune.

Did analysis of rates/triggers with and without gas - all with 100 epA

                     WITHOUT GAS        WITH GAS

S2-2 all           3000                        3800

PD                   1500                        1900

Coincidence  10                            1800 

S2-1 all           13000                     57000

The trigger (7000 ish) is a sum of the first three of course. Interesting that all the coincidences are gas-"related" - which is good I think. It confirms to me that we should consider, at some point, running on only coincidences in the trigger to cut down the dead time (currently 60% live, 40% dead)

that's it. Jamie checking the spectra, if nothing else in this e-log then they are ok.

Sort started on new data, will run it overnight and compare in the morning with the old sort.

Mike

Jessica Tomlinson wrote:

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 number the data from the last event was being read into the next event too. It was only clearing the 'data(i) arrays which is what the data is unpacked as. I have now got it clearing both so data is not read in for multiple events.

? 

As far as I am aware it has never been necessary to explicitly zero the 'raw' (or packed) data arrays containing the

ADC/TDC data and active channels in each event. Usually it is only necessary to zero those elements of the 'unpacked'

arrays which contain event data.

> Alignments checks revealed that downstream end of
> TUDA was ~1mm off (can't remember which way).

Was the downstream flange bolted into position?

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 stop mode) after a DAQ crash causing broad loci in the E vs T spectra and
times of the wrong sign. This was corrected from Run 81 onwards.

TDC channel 0 (reference channel) should have been recorded in the EbyE data - common stop TDC values
can therefore be calculated offline by switching the egid2logical logical variable csm from TRUE to FALSE.
  
2. The offline sort is behaving very badly and many of the sorts run since yesterday to now are wrong. Make sure
you (a) sort on a different machine than the DAQ and (b) make sure that the sort is killed each time you start a
new sort and (c) make sure that it is sorting the righrt run number.

Amen

Alignments checks revealed that downstream end of TUDA was ~1mm off (can't remember which way).

Re-entrant flange (window end) found to be ~5mm too low and ~2mm to the left. Checked upstream end of chamber and was ok.

Removed bellows etc. and re-entrant flange, replaced with re-entrant flange bolts only figure tight. Tighten bolts from inside chamber whilst checking alignment, adjusting as appropriate.

Managed to get to ~0.5mm to the right and ~0.25mm too low.

This is acceptable so closed chamber and checked vacuum down to ~150mTorr.

See attached.

1) PD run with gas (250Torr) - done

2) Pump down to 50 Torr - done

3) PD run - done

4) Take data (PD out) at 50Torr ~2 hrs. ~110epA - done

5) Pump out - done

6) PD run (no gas) - done

   a) remove 5mm collimator and run without gas, ~100epA (no PD) - done

7) Complete H2 venting process - done

8) Open up, sources in (window off) - done

9) Pump down - done

10) alpha data (some of the S2-1 inner strips look  very ill indeed , but all but one or two show clear triple-alpha peaks.  - done

11) pulser walkthrough - done

12) vent and open up - done

13) dismount detectors and re-entrant flange - done

14) pub!

Done - finished at 7.30pm, pitcher of ale methinks. 

 In attachment are the peak position in the photodiodes (with high gain setting) for the target thickness measurements.

2um x 8 mm Ni windows leaked tested on TUDA gas cell. With window placed on the outside of the cell, cell was evacuated and pressure monitored with time, i.e. 1atm differential air pressure. Comparison to leak rate with blank flange also do.

Tests were performed in order: Ni, 30 minuets pumping, Ni again, blank, Ni third time.

Plots are the same data, different scales.