To use both anydesk and firefox on the carme server require an internet connection.

As the server is on the cryring local network an ssh tunnel needs to be opened to the GSI proxy server.

To do this: ssh -L 8080:proxy.gsi.de:8080 carme@atppc025` and leave terminal open and running.
Both anydesk and firefox have been configured to use the proxy localhost:8080

For the carme password ask J. Marsh or C. Bruno

Ion beam energy is calculated using Beamcalc (https://web-docs.gsi.de/~lestinsk/beamcalc/electron.php)

Electron current is set to 4.3 mA and can be taken from Grafana

Alpha factor is 50

Ion energy is then adjusted using the cooler voltage

The cooler voltage inserted into BeamCalc is taken from the FC20 voltage divider. However an offset from the space charge correction is required!

This correction is determined experimentally by changing the electron current and finding the cooler voltage which maintains the optimum cooling of the beam.

Attachment 1 shows this plot for 15N1+ at  ~0.426 MeV/u

Attachment 2 shows this same plot in comparison with BeamCalc

To obtain the correct energy we need to subtract 2V from the voltage used in BeamCalc

An example is shown in attachment 3

Here to obtain an ion energy of 426.6 keV/u requires a cooler voltage of 246.7 V. But, due to the space charge correction this value should be 244.7 V.

The cooler voltage setpoint should therefore be chosen so that the FC20 voltage divider reads 244.7 V.

The setpoint needs to be ~0.55 V higher than the desired value i.e setpoint of 245.25 V to obtain the required 244.7 V (at least this beamtime it does)

Assuming DSSSD is 1000um thick we can expect to observe protons for E_lab=11MeV as follows

14N(d,p)15N(gs)   E_p=5.4MeV
14N(d,p)15N(5.3)  E_p=8.0MeV

(Wed 27 October)

Dismounted plate from rod. Dismounted broken detectors from plate and placed back in box. Dismounted "dog leg" struts and replaced with fully un-threaded struts.

Mounted 3335-13 in bottom position.

Attempted to mount 3335-2 in top position: dog leg strut conflicts with jacking plate. Attempted to remove - bolt stuck in thread. Removed bolt with great difficulty after dousing the bolt and hole in ethanol. M3 vented bolt is completely bent. Thread in hole appears still good. Bad bolt? Mounted strut upside-down with new M3 vented bolt. No issues. Mounted 3335-2 on plate.

Mounted extension plates for strain relief. Note countersunk bolts.

Removed all flanges with wires from CARME. Lubricated rod with ethanol. Slid rod with 2x detectors on. FIxed with bolt in front and back. Plate securely mounted in CARME, but some degree on rotational freedom is left.

(Tue 26 October)

Two new CARME DSSD arrived in GSI and collected. Visually inspected both sides. No obvious damage. Photos attached. Second detector (3335-2) was shipped in upside-down box. Does not seem to have made any difference.

3335-13 will be mounted on bottom of plate. 3335-2 will be mounted on top of plate.

Hopefully we will not be opening the chamber for quite some time so find attached images of all four installed detectors and a video of them both moving into the beam axis for future reference

17.43 setup signals from detector movement controller.

See attachment 1
                                                         NIM               TTL                 TTL             +12V
Signal from CRYRING ------> CAEN N89 ------> LF4000 -------> CAEN N89 -------> LeCroy 222 -------> PCB amp -------> start move in
( active high )         TTL              NIM  FIFO  -------> CAEN N89 -------> LeCroy 222 -------> PCB amp -------> start move out
                                                    not(NIM)               TTL                 TTL    ^        +12V
                                                                                                      |
                                                                                                      |
CAEN N89 mode switch to OUT                                                                                                  PSU +12V 

Widths of signals from LeCroy 222
 move in = 75ms
 move out = 25ms

Note - the outputs of EG&G/ESN LF4000 FIFO could be connected directly to the LeCroy 222 as the inputs accept NIM and TTL

29/9/21

We have opened the cleaned parts for assembley of the moving detector frames. We appear to have everything we require. 

Standoffs - 12 M3x35 bolts, Many M3 washers, Many M3 nuts, 16 standoff tubes. 

Heatshield - 46 M2 nuts, 46 M2x20 bolts, 16 M2 washers

Strain reliefs - 20 M4x35 bolts, Many M4 washers. 

Strain relief supports - 30 M4x10 hex head bolts, Many M4 washers

Clamp - 2 M6x10 bolts 

Upon attempting to assemble standoffs M3 bolts became stuck and could not be removed. A similar issue occurred with the MACOR assembley a few weeks ago. The detector frames have been given to Omer along with a diagram of the correct hole sizes to check and re-drill holes if neccessary. Frames will then be cleaned. We expect to get them back tomorrow to continue assembley. 

30/9/21

Bolt hole sizes were checked and appear to be correct, no re-drilling required. Detector frames cleaned after stuck bolts were removed. Holes were checked again using M3 and M4 bolts, none became stuck. The heatshields, strain supports and clamp were assembled on the frames. Remaining pieces and bolts are accounted for and can be assembled when required.  

10:30 Found ADC#4 on aida 1 and 4 are suddenly noisy. See attach 1-2. Checkloaded multiple times - no effect.

Leakage current overnight was stable, but a clear transient can be observed yesterday around the times of the DSSD motion test. We did not observe this in the cave looking at the CAEN module - it might have been too fast.

Now reducing bias to 50 V and will check differences later. FEE temperatures OK.

10:50 Started DAQ. Rates are much higher in n+n strips, but p+n strips appear unaffected. See attach 4-5.

Stopped DAQ. Will leave 50V until after lunch.

11:27 Checked motor control status after yesterday's setup (see previous ELOG entry). See attach 6.

IN counters are respectively: read, increases, latch (left), latch (right)

Read is the number of pulses sent with the instruction to move. Increases is the number of times the instruction was considered. Latch on/off indicates the 1 s time interval during which commands sent to a motor arm (left or right) are considered double-firing or mistake, and ignored.

The number of increases is the same for move in/out - good!

The number of increases for move out is 1 unit less than move in - one double pulse / double command must have been received overnight and ignored.

Note torque on right arm is 2 (arbitrary units) which is unusually high and may indicate some tension in the kapton wires. No apparent effect on DSSD2,4 on that arm. Will not move for now.

13:24 FEE temperatures OK, leakage currents decreasing slighly.

13:41 Slowly increased bias to 100V. Interestingly it is now DSSD#4 (Ch#3) that displays the highest leakage current. Attach 7

13:45 Stats & Rates look rather similar to earlier this morning at 150V, but aida01 and 04 are quieter. Attach 8-9. Will leave at 100V for a while longer before moving to 150V.

15:20 Set bias to 150V

15:50 Nikos testing target. Started short run. Stats & Rates attached (10-11). Same as yesterday, aida01 and 04 ADC#4 no longer noisy.

V-I on attach 12-13. Legends unreliable!

17:00 Nikos completed target test. YR09 pressure around 3E-10 mbar with around 5E11 atoms/cm2 He target. Target not quite stable (10-20%), some optimisation required, but pressure holds at 3E-10 mbar for several minutes.

Beam on target will increase ring pressure. Can't test for now. Target tests without beam complete. Need to log all the data remotely. No logging available at present.

Leaving bias at 150V overnight. No run.

Detector is not biasing as it has in previous tests. Last bias 15/1/22 see previous elogs, max leakage current ~10 uA at 150V

Detector bias increases well above 10uA for voltages as low as 30-40V. Optical windows covered, Y09 valves closed, large ion pump OFF and both ion gauges OFF produces similar results but with a slightly lower leakage current.

Grounding and pulser cables removed from FEEs and jumper attached to nn bias adaptor card - no change. Bias module swapped out - no effect. NIM rack shows expected voltages (6,12,24) on multimeter.

AIDA03 - disconnected. Behaves as expected. Get waveforms and pulser peak. Pulser peak FWHM ~ 70 channels, noise transients observed.

AIDA02 - Not producing ADC data

AIDA01,04,05,06,07,08 - Very high rates - noisy

FEE mounts for 5,6,7,8 disassembled to access adaptor boards. No sign of debris which could cause short on adaptor boards. 

Adaptor boards removed and checked against spares with multimeter. Both show same characteristics. Pins on feedthrough checked using multimeter. No longer see -18.5 KOhm between bias pins, no see 140 kOhm which is similar to bias pin to non bias pin from prevous tests.

Camera on interaction chamber removed and replaced with foil, no change. 

Ion gauge (Edinburgh group) turned ON

Decided to move detectors using motors. Movement caused change in bias characteristic of the detector. Initial movement was 50 repetitions in and out over which the bias was increased from 10V to 140V. Over this range the detector exhibited diode like behaviour. The difference between the in and position and out position caused a 0.5 uA difference in leakage current. Once stationary, the current was stabel at 140V but after 20s current increased rapidly and tripped.  

Increasing bias again to 30V while stationary (out position on motors) gave 7.3 uA , going to 60V tripped again. 

Moving the detectors IN but keeping stationary gave a stable current at 30V of 4.2 uA increasing to 70V tripped again. Turning off the gauge reduced the current at 30V to 2.9 uA and 70V to be be ~15.5 uA. Opening an optical window at 70V saw no change in leakage current. 

Possibility thermocouple attached to or around the detector may have come loose within the chamber? Thermocouples outisde of chamber removed from thermocouple flange so they don't interact with outside of chamber. 

Detector biased to 60V - 10 uA. Detector position moved in and out 20 repetions, during movement current dropped to 2.85 uA. After motion stopped leakage current remained stable at 2.85 uA. Optical window opened no change. Torch light shone into optical window - increase in leakage current to 3.5 uA. Torch off - return to 2.85 uA. 

Motion started again for 50 repetitions to test stability of leakage current. Current varies between 2.84-2.88 uA during movement, settles to 2.85 uA once motion stopped. 

FEE holder reassembley. Involved turning off bias, unplugging bias cables and rebuilding assembley. FEE holders reaasembled with FEEs reconnected. Water cables, HDMI, ethernet, power connected. Bias turned off and on during reassembley multiple times to check for changes. Each time bias at 60V remained 2.85uA. Each time lower voltages appear to show diode like response in leakage current output. 

Pulser connected and FEEs turned back on. Aida05 appears not producing ADC data rates 8 kHz on statistics page -investigate further. Aida06 rate ~70 kHZ can see pulser. Aida07, 08 nn bias show rates ~300 kHZ possible not enough bias for nn side. Rate for all FEEs yesterday (unbiased) was 200-300 kHZ except for AIDA03 disconnected and AIDA02 which wasn't producing ADC data. Photo of Aida06 spectra attached (log scale for pulser). 

FEEs turned OFF. Bias left on 60V - 2.85 uA see if stable overnight, stable for approx 2.5 hours before leaving cryring. Detector moved to OUT position, pin back in. 

To do - Grounding, reduce noise, waveforms,  investigate AIDA05, how high can we bias?  

Just after midnight on 20/04 it appears DSSD #4 leakage current has perfectly stabilised. See attached.

DSSDs remain biased.

20 April

19:30 - leakage current still stable but anydesk connection not working.

Machine is connected, but connection fails.

21 April

Anydesk connection works again. Leakage current remains stable. What changed?

Re-increase in DSSSD leakage current c. 14-15.00 6.6.24 

There was a significant temperature spike in the CRYRING hall on the afternoon of 6.6.24 which has, partly, recovered - see attachment 1

DAQ restarted. Run46. All appears OK, aida01 shows high rates across ASIC 4 even with no beam which could not be resolved via ASIC control. May suggest some damge.

Merger is running and tape server is writing data to disk. Data rate is about 1300 kB/sec from 800 kb/sec due to increase in aida01 rate.

FEE temps OK

All system checks OK

Detectors moved to IN position (left arm pot = 36.5 mm, right arm =70.49 mm). Target ON.

Lost beam again.

Run 47 started.

06:00

FEE modules power cycled.

No issues on power cycle restart.

All system check OK - clock status, ADC calibration etc.

ASIC settings loaded are the same as previous startup. Slow comparator thresholds 0x32 (500 keV) and all FEEs set to LEC.

Statistics (ADC data) - attachment 1. Note aida10 fluctuations between 10,000 and 300 which appears to be a physics effect (beam on target)

Spectrum browser - layout 1 - attachment 2

Merger - attachment 3

Tape server - attachment 4 Data rate is about 300 kB/sec.

FEE temperatures OK

Waveforms - attachments 4,5

All Lekagae currents appear normal

Online monitoring scropt started. Beam on target. Run 22 started. See nect elog for details.

signals from ICT and CRYRADIO are now connected to AIDA2 and AIDA5 respectively. ICT is set to factor 200 and CRYRADIO to 40 for now.

(AIDA3 --> electron cooler)

The current bottle of D2 was installed on friday 06.06. at around 12:00. I assume we started at 200 bar.

Right now we have 50 bar remaining in this bottle (16.06. at 8:00).

This is an average consumption of ~15 bar/day

 150 bar / 9.83 days

D+D minimum energy Ecm = 150 keV which corresponds to Ed=150 keV/u or Ed=300 keV. Therefore we need a threshold below this.

Test 1 - Current status

Current slow comparator threshold is 0x64 (1 MeV). ADC data items rate in all FEEs is essentially zero with this threshold. (except aida03 and aida04). Aida15 and 16 also show ~1k rates when DSSD4 current is fluctuating.

Pulser was set to find point it is cut off by the threshold. Attachments 1,2,3 show 1.8L for nn channels with the pulser set to 570,550 and 530. Over this range pulser disappears. Estimate 550 is equal to ~1 MeV.

Test 2 - Noise level at lower threshold 200 keV

Threshold set to 0x14 (200 keV). Pulser kept at 550 for the time being to gauge location of noise compared to pulser. Attachments 4,5 show 1.8L for nn and pn channels respectively. Some noise observable at low energy.

Note zero energy is around 32500 channels. In nn channels (attachment 4) pulser is to the right of the noise peak, wheras in pn channels (attachment 5) pulser is to the left of noise peak.

Attachment 6 shows data rates with pulser off. Rates okay, only aida15 has very high rate (80k), rest of channels <5k.

Test 3 - Noise level at lower threshold 100 keV

Threshold set to 0xa (100 keV). Pulser kept at 550 for the time being. Attachment 7 shows data rates with pulser off. Rates significantly higher all round. Half of channels >50k, some >100k.

Attachments 8,9 show 1.8L for pn and nn channels respectively. A lot more noise observable at low energy. Pulser peaks generally overshadowed by noise. 100 keV probably too low to set threshold.

Test 4 - Noise level at lower threshold 150 keV

Threshold set to 0xf (150 keV). Pulser kept at 550 for the time being. Attachment 10 shows data rates with pulser off. In general rates are pretty low. Most channels <1k. Aida15 and 16 pretty high.

Attachments 11,12 show 1.8L for nn and pn channels respectively. Noise observable at low energy but in general less than that of the pulser peaks.

Test 5 - D+D pulser peak at lower threshold 150 keV

Theshold kept at 0xf (150 keV). Pulser set to 180 (should be about 300 keV based on Test 1). This should be the level of d+d at our lowest beam energy.

Attachments 13,14 show 1.8L for pn and nn channels respectively.

Test 6 - D+D pulser peak at lower threshold 200 keV

Theshold increased to 0x14 (200 keV). Pulser kept at 180 (should be about 300 keV based on Test 1). This should be the level of d+d at our lowest beam energy.

Attachments 15,16 show 1.8L for nn and pn channels respectively.

06:20

Servo motors moved to fully out position as some work on the beam was neccessary. Beam injection had dropped from ~9e7 to around 1e7. Potentiometer reads 19.10 mm.   

Still trying to improve target density. Current setpoint 100 K.

Merger OK

Data rate = 1600 kb/sec

Leakage current = 3.21 uA

System checks OK - wr fails

         Base         Current     Difference
aida01 fault      0xab60 :      0xab8e :      46  
aida02 fault      0x88d3 :      0x8900 :      45  
aida03 fault      0x23aa :      0x23d8 :      46  
aida04 fault      0x15d7 :      0x1605 :      46  
aida05 fault      0x2f03 :      0x2f0f :      12  
White Rabbit error counter test result: Passed 0, Failed 5

Understand the status reports as follows:-
Status bit 3 : White Rabbit decoder detected an error in the received data
Status bit 2 : Firmware registered WR error, no reload of Timestamp
Status bit 0 : White Rabbit decoder reports uncertain of Timestamp information from WR

Avg ring pressure = 4.3E-10 mbar.

06:40

Target density still very low. Setpoint back to 116 K. Detectors still fully out, very low rutherford rate.

Attempted to move nozzle to increase density, already on maximum point. 

06:50

Setpoint to 95 k. Small increase in target density, however this was temporary