Still  no beam in CRING.

Motor fully out position.

SW3

- Merger OK

- Screenshot uploaded

- Data rate : 243 kbytes/s

SW4

- current plot uploaded

SW2

- T OK

- system wide checks OK

- Check statistics tab ok

- Spectra ok

SW5

4 plots uploaded

There are some problems with ion source.  No beam in CRYING.

Motor fully out position.

SW3

- Merger OK

- Screenshot uploaded

- Data rate : 230 kbytes/s

SW4

- current plot uploaded

SW2

- T OK

- system wide checks OK

- Check statistics tab ok

- Spectra ok

SW5

4 plots uploaded

Still  no beam in CRING.

Motor fully out position.

SW3

- Merger OK

- Screenshot uploaded

- Data rate : 236 kbytes/s

SW4

- current plot uploaded

SW2

- T OK

- system wide checks OK

- Check statistics tab ok

- Spectra ok

SW5

4 plots uploaded

Gleb Vorobyev tried for few hours to fix the ion source but without success.

So, there will be no beam in CRYRING during this night shift. Today at about 08:00 the efforts to fix the ion source will be restarted.

Still  no beam in CRING.

Motor fully out position.

SW3

- Merger OK

- Screenshot uploaded

- Data rate : 217 kbytes/s

SW4

- current plot uploaded

SW2

- T OK

- system wide checks OK

- Check statistics tab ok

- Spectra ok

SW5

4 plots uploaded

07:56 Gleb has taken the beam to try settings for the 5+ charge state. As soon as the target is ready, the 1+ charge state will be given back.

Detectors have been moved out for safety

08:10
      Run 63
   
      DSSSD bias & leakage current OK - attachment 1

      FEE64 temperatures OK - attachment 2

      ADC data item stats - attachment 3

      per FEE64 Rate spectra - attachment 4

      
09:55 
      Run 63 

      DSSSD bias & leakage current OK 

      FEE64 temperatures OK  

      ADC data item stats OK

      per FEE64 Rate spectra OK

10:30

Data rate appeared very high c. 2000 kB/s instead of the usual 200 kB/s.

Rate on first two ASICs of aida02 was high (~2 kHz) but rest of aida01-04 looked fine.

ASIC check load reduced rate back to normal levels. Data rate reduced back to 200 kB/sec.

New ADC offsets loaded into the CARME_Sort code

Aida03 appears to be down. Check load does not resolve issue. Moving detector arm does not resolve issue. No spike in leakage current observed. System checks appear OK.  Zeroing ADC data item statistics keeps aida03 at 606023857 items and does not zero.

Issue resolved by resetting the data links for aida03

13:20

DSSSD bias & leakage current OK

FEE64 temperatures OK

ADC data item stats OK

per FEE64 Rate spectra OK

21:30

Waiting for the target.

Beam has been running, we have been running without storage.

See attachment showing beam stripe on the detectors.

To test the detectors, adaptors were installed on the feed through flanges. A negative bias voltage was applied in steps of 10 V from 0 to 150 V. The V-I plots are attached for the four detectors. Three detectors - top right, top left, and bottom left (in the direction of the beam) - are fine. For the bottom right detector (in the direction of the beam), the current was fluctuating and was considerably high (1st test). The adaptors connecting to this detector were removed and checked by applying the bias voltage which showed zero current for voltages ranging from 0 to - 150 V, confirming the adaptors to be fine. They were then exchanged by other adaptors and the V-I test was repeated again (2nd test) with fluctuating and high current values. One of the flanges connecting to this detector was found to be light-tight. These tests were done at an ambient temperature of 21 degrees. Also, we couldn't find the rest of the three SHV to 2x Lemo 00 cables for the detector HV.

Today, the foil was opened, the pins on the bottom right detector were checked and looked fine, the right-hand arm was moved a bit in and then out, and the foil was tightly closed again. The negative bias voltage was applied from 0 to 50 V in steps of 10 V. During the measurement, the lights in the cave were switched off to ensure no leakage current from the light*. The results are shown in Attachment 1. To condition the detector, it was left at a negative bias voltage of 50 V for ~ 3 hours with lights on. No increase in current was seen (see Attachment 2), indicating the chamber was nicely covered with foil. Then the negative voltage was increased from 60 V to 150 V in steps of 10 V. No large current readings, like yesterday, were seen today (see Attachment 3). The detector was then left at -150 V for ~ 30 minutes with the current to be nearly stable with fluctuations in the range of 70-100 nA. The foil was then taken off to check if there are any dust particles on the detector surface. As can be seen in Attachment 6, some dust particle was found at the bias/multi-guard ring (MGR) boundary structures of the DSSSD. The area was then nicely cleaned with isopropanol + lab tissue wipe (see Attachment 7) and the chamber was covered with aluminum foil again. The negative bias voltage was applied from 0 to 150 V in steps of 10 V again and the results can be seen in attachment 5, indicating the response of the detector to be normal, unlike yesterday. Before calling the day off, the detector was left at -150 V overnight.

* Every time, before switching off the lights, it was checked that no one else was in the cave.

Since yesterday evening, the bottom right detector was at -150 V. In the morning, the current was quite stable ~ 6.77 uA. The bias was switched off, the foils opened, both of the detector arms were moved in and out three times, and the chamber was tightly covered again. A negative bias voltage was applied from 0 to 150 V in steps of 10 V one by one to all four detectors, and the V-I results can be seen in Attachments 1-4. All detectors seem to be fine. The variation of the current with time at a constant bias voltage of -150 V was checked for all detectors and the results are in Attachments 5-8. Also, with an applied bias voltage of -150 V to the bottom right and left detector, the detector arms were moved in and out three times which showed a variation of 1-2 nA and 1 nA in the leakage current. For further conditioning of the bottom right detector, it is again left with a negative bias voltage of 150 V over the weekend.

10.20 Pirani 1e-03mbar IE514 3.26e-08mbar


12.53 CARME Leybold IE514 gauge OFF


Top right DSSSD bias -20V leakage current -10.51uA


Three internal ThermoCouples (TCs) -labeled 1, 2, and 3 in attachment 1 - were attached and tested on the TC-08 boards. Only 2 showed the ambient temperature, see attachment 3. 1 and 3 showed some strange numbers, see attachments 2 and 4 respectively.


15.28 CARME Leybold IE514 gauge OFF. Top right DSSSD bias -20V leakage current -10.44A


All the TCs are attached to TC-08 modules. See attachments 5-7. Once all TCs were plugged into TC-08 modules, they were fine.


TC-08 A0067

1. Internal TC 1
2. Internal TC 2
3. Internal TC 3
4. CARME front top
5. CARME front bottom
6. Top hanging middle
7. CARME middle middle
8. CARME middle bottom



TC-08 A0066

1. CARME middle top
2. CARME back middle
3. Elbow
4. Valve
5. Magnet pipe
6. CARME back top
7. CARME back float
8. CARME back bottom

Heating Jackets placed beneath the heaters. See attachments 8-10.

11.15 Pirani 1.0e-03mbar IE514 2.72e-08mbar

16.35 Pirani 1.0e-03mbar IE514 2.61e-08mbar

11.40 Pirani 1.00e-3 mbar IE514 2.23e-08mbar

15.15 7d/24h vacuum plots

01:00

Beam optimisation since 09:25.

Target ON and open to the ring

YR09xxx ETarget ~1.9e-10 (saturated)

Target E4 inlet pressure ~8.8E-9 mbar

Dump S3 ~ 6.8E-10 mbar

Nozzle temperature 150 K

Run 54 started, monitoring code restarted.

Beam optimization will be done until 3 pm and will be then give for the experiment.

08:30

Beam ON ~1.0E7 pps

Target ON and open to the ring

YR09xxx ETarget ~1.9e-10 (saturated)

Target E4 inlet pressure ~8.8E-9 mbar

Dump S3 ~ 6.8E-10 mbar

Nozzle temperature 150 K

Run 54 started, monitoring code restarted.

FH and ML are optimising the beam.

09:30

Beam optimisation. No beam since 09:25.

Target ON and open to the ring

YR09xxx ETarget ~1.9e-10 (saturated)

Target E4 inlet pressure ~8.8E-9 mbar

Dump S3 ~ 6.8E-10 mbar

Nozzle temperature 150 K

Run 54 started, monitoring code restarted.

FH and ML are optimising the beam.

YR00DA1ZB is the channel for PMT rate.

11:30

Beam optimisation. No beam since 09:25.

Target ON and open to the ring

YR09xxx ETarget ~1.9e-10 (saturated)

Target E4 inlet pressure ~8.8E-9 mbar

Dump S3 ~ 6.8E-10 mbar

Nozzle temperature 150 K

Run 54 started, monitoring code restarted.

Beam optimization will be done until 3 pm and will be then give for the experiment.

07:30

Beam ON ~8.0E6 pps

Target ON and open to the ring

YR09xxx ETarget ~1.9e-10 (saturated)

Target E4 inlet pressure ~8.8E-9 mbar

Dump S3 ~ 6.8E-10 mbar

Nozzle temperature 150 K

Run 54 started, monitoring code restarted.

08:00 The beam is electron cooled by FH and the orbit of the beam is slighty changed.

10:00

Check Leakage current: (see attachment 2)

Check NewMerger tab: (see attachment 5)

Check Fee temperatures: all green (see attachment 1)

Check statistics tab: ADC data items (see attachment 3)

                                 ADC coincidence-info #8 (see attachment 6)

                                 Good events (see attachment 7)

 Check Spectrum Browser tab: (see attachment 9)                 

Check the following plots:

                                         LowEnergyXYTotalDSSD0 (see attachment 9)

                                         LowEnergyExTotal (see attachment 10)

                                         LowEnergyEyTotal (see attachment 11)

Check system wide checks tab: White Rabbit error counter test result: Passed 0, Failed 5 (see attachment 8)