15:06
Run25

Pulser walkthrough

EGG Ortec 448 Pulser

Amplitide 90,000-10,000 @ 10,000 step
Normalise 5.0
Attenuators x5 IN
t_r 100ns
Tau_d 50us
Frequency Int Osc 50Hz
Polarity + ( - polarity via Cooknell SA1 Sum & Invert Amp )

Saved pressure reading and temperature data logs from internal target in /TapeServer/22Feb/OtherData

Leakage current data is saved in /home/npg/Programs/caenlogger

03.09.2021   09:00   5.27E-7 mbar     
03.09.2021   13:00   4.08E-7 mbar                   

09;00    Will keep pumping down this morning.

Pressure found in 10-7 mbar range.

Decided to leak test anyway for safety.

Closed top valve. Vented turbo and backing 
line. Installed additional valve and T 
piece.

Pumping down again. Will begin leak 
testing soon.

Removed turbo pump and set aside in a box. Considering switching to the other turbo to avoid degradation due to lack of use.

Installed bellows support and OG devised support to avoid bellows sagging when Carme is split open.

Attempted to install new CARME feet, but there were issues. Feet with slots produced do not match design drawings by PB. Slot is in the wrong side. Furthermore Carme interaction chamber flange thickness is 36 mm vs. 36.5 mm in drawing. DR can modify feet to make them fit tomorrow.

Now just waiting for rails to open CARME. Will arrive tomorrow or on Tuesday, after weekend and Mayday.

We need to connect the non-bakeable (max 80C) wire of the ion pump belonging to the vacuum division, and we also need to connect the two newly-repaired NEG cables to the D2000 modules. That requires partly opening the tent to gain access.

Set heaters temperature from 450 C -> 400 C - CARME floating TC temperature goes from ~98 C to ~88C.

Set heaters temperature to 350 C. Left to cool over lunch.

 Connected GSI vacuum division ion pump and IE514

Connected D-2000 upstream left/right with repaired cables

Flashed all ion pumps. Ion pump #4 was flashed a couple of times, but has now started arcing. The issue is not with the module - either the wire or the ion element are damaged.

Set heaters to 300 C. Left to cool a bit more overnight. Planning on NEG on tomorrow.

Found CARME pressure at 2E-7 mbar

Raspberry pi took pictures until 4 am and 
then lost contact with camera. Reasons 
unclear. Plugging camera in / out solved 
the issue.  Will have to be investigated 
if it happens again.

Left list of things to do with RSS. In 
particular:
- Install xhv feedthrough and 
thermocouples. Prepared on desk
- Install blocking pin in right hand motor 
after pressure returns to atmosphere
- Cover bellows with aluminium to protect 
from fibreglass when mounting tent 
eventually
- Check all parts available for detector 
supports with mounting sketch Peter sent ( 
RSS to recover sketch)
- Investigate baking program logging. 
Unclear if logging is working - did we 
disable it for some reason? 

Valve on scroll closed. Scroll off. Turbo 
off. Pressure sensors off. Raspberry pi 
off.

Activities to resume on 16 September.



Attached are the pumping down plots
start point:  10.09.2021    19:00 
end point:    11.09.2021    16:00



10.09.2021    19:00    1.09e-6
10.09.2021    20:00    7.57e-7
10.09.2021    21:00    6.17e-7
10.09.2021    22:00    5.36e-7
10.09.2021    23:00    4.82e-7
11.09.2021    00:00    4.42e-7
11.09.2021    01:00    4.10e-7
11.09.2021    02:00    3.84e-7
11.09.2021    03:00    3.62e-7
11.09.2021    04:00    3.43e-7
11.09.2021    15:00    2.29e-7
11.09.2021    16:00    2.31e-7

(Mon 25 October - Tue 26 October)

Considered different strategies to mount DSSDs inside CARME, while waiting for 2x new DSSD to arrive.

Plan A: Mount DSSDs on plate on the bench, slide plate on rod, then attach cables, then attach strain relief

Plan B: Mount DSSDs on plate, attach cables, attach strain relief, slide plate on rod, connect cables to feedthroughs

Mounted detectors on plate using new "dog leg" connectors. Threaded and unthreaded holes are flipped! Asked DR to unthread hole in two out of four, and clean.

Attempted to proceed with Plan B with stand-in broken detector. Found even a single wire harness attached to the detector was quite hard to insert in the chamber. Temporarily dismounted left-hand 2x UHV1400 to give more space.

Slid plate on rod. New position of rod block makes it easier to mount. Spraying ethanol on the rod to lubricate also helps greatly. Secured plate to rod. Holding flange with cables in left hand, attempted to mount macor plug in feedthrough with right hand. Unable to exert sufficient strength (CB, JM, OG). Pulling on the cable puts strain on the DSSD. Decided to avoid.

Attempted Plan A. Jacked connector in with no issues using M6x40 partly threaded bolts. Unable to unjack due to part threads! Obtained fully threaded rods. Unjacked using washer + two nuts tightened on each other. Jacked and unjacked another connector.

Decided to proceed with A. Having any cable pre-mounted in the chamber is a potential hazard to the detectors while mounting plate. Decided to dismount all flanges, re-organise harnesses and mount one flange+harness at a time after mounting detector on rod.

Used thick Kapton coated Cu from NEG pumps to organise the cables and improve strain relief.

Due to width of MACOR strain relief and nuts on the back of the MACOR plugs, realised strain relief cannot be mounted as intended. Asked DR to produce 90 x 30 x 3 mm extender plates instead. MACOR strain relief are 15 mm wide. Extender plate have 3x M4 unthreaded countersunk to fix to detector plate, 3x M4 threaded holes to hold MACOR strain relief.

Organised cable harnesses.

4 short: all good -> two to be mounted

2 long: all good -> to be mounted

1 long: Broken MACOR backplate and lead. Lead removed. Attempted to mount with backplate in new lead - unable to do so. Removing backplate requires re-crimping. Will have to send back to Edinburgh

1 long: Wires cross in odd way. Will have to re-organise. Probably requires re-crimping. One pin smashed during jacking. Not sure if rescuable. See attached.

(30 August 2021)

The current state of YR09 is as per attach 1. CCC has been removed, but additional pumps and gauges remain. Some
will have to be mounted on CARME. Dismounting is scheduled for this Wed.

CB and RSS have been preparing for CARME to be mounted. JM supplied pictures of mounting process in DL. Attach 2-5.

2: Studs on carriages
3: CARME feet
4: Back foot
5: Elbows support

All components required have been located in the boxes except

- Cap hex bolts (M4 x 12?) to mount studs on carriages
- Plastic rails to remove cariages (a solution with bubble-wrap was found. Extra carriages are now in a box. Do
not turn it around.)
- Baking tray does not fit with carriages. Unclear how it did before. Will try to file down edges today.
- Bolts for CARME feet are of rather poor quality, and a host of different sizes. We may have to buy some, but
unclear what length.
- Studs are of different heights. That was not clear from previous pictures (attach 6)
- New and improved valve/elbow support (attach 7) is aligned worse than old one. Will keep using old one. Should
still work somehow.

Connected pneumatic hoses prepared by Gleb. Opened flow to pressure reducer set at 2 bar. Ok. Attempted to operate pneumatic motors. Somehow left / right pneumatic motors controls swapped around! Works fine otherwise. Most likely hardware issue, i.e. hoses are inverted inside motor box. Software fix possible in principle. Probably easiest to swap hoses going out from motor box (top to bottom and vice versa). Could not pull out hoses after installing. To do for next week.

Started connecting NEG and ion pumps. Realised wires are only labeled on one side. Had to separate all wires in one harness to make absolutely sure to know which wire is which. Second harness to be done next week. Please connect D2000 elements to bottom C4 power module, NEG getters wires 1-4 to middle power module and 5-6 to top power module. This means activation can proceed bottom to top of rack with minimal risk of mix ups. Please install top C4 module back in rack - missing appropriate rack shelf.

Installed Jan's Nim bin in rack. Jan thought that it was dead but seems to work just fine. Maybe test again?

To do next week 

Place thermocouples as per suggestion on file in baking Pi Baking directory.

Remove valves support. Install bottom of tent.

Install aluminium frame and heaters. This may require stopping the turbo pump and closing top gate valve.

Install rest of tent. Be careful not to pull or stretch the fabric. It's fragile to tension and fibreglass will pour out.

Install aluminised fibreglass and aluminium shell.

Start baking. Target temperature 120C.

Mounted additional cross member for motor 
support. See attach 1

Washer required to make it fit on foot on 
one side.

Holes in Al support are not matching elephant feet...! Will have to re-
drill them now.

Yr09 fully dismounted downstream

CARME currently in vacuum, pressure ~3E-10 mbar. Chamber to be vented tomorrow afternoon by vacuum division. We have active both pirani and hot cathode gauge to aid. 

Equipment removed from the chamber in preparation for dismount of CARME from the ring this week. Equipment removed includes:

• Neg pump cabling
• Heating wire
• FEE electronic units and associated cabling (power, hdmi etc)
• Stainless steel FEE holders
• Red and blue cooling hoses

Attached image shows chamber following equipment removal. Adaptor cards still attached to feed-through flanges. ERNI connnectors examined, all fine except for FEE aida03 which has a bent pin (see attached image). Will dismount adaptor cards to examine further tomorrow. Feed-through flanges will also be examined to check for bent pins following adaptor card removal. 

New CARME frame is part constructed and is in the CRYRING area. Requires rails and castors which should arrive this week. The height of the frame will require shortening, to be level with the current frame. This will be looked into further tomorrow. 

Local power outage at the CRYRING today, while JG was trying to activate the ion pumps. Unlcear what caused it.

Valve on scroll worked as intended, but CARME reacehd 1E-7 mbar from turbo (?) venting.

Power restored. Pressure back in the 1E-11 mbar range, decreasing.

Temperature still well above room.

ML reports power cut in CRYRING cave. Reasons unknown. No effect on vacuum, but top valve closed for safety reason. Ramping down temperature.

Sudden and unexpected power cut at 10:02 German time, affecting all the target hall.

It has been caused by the emergency alarm being triggered. Reasons unclear. Electricians were informed.

CARME top gate valve closed.

10:33 power is back

Set point 120C
Scroll on, turbo on (980 Hz normal operation), valve open
Pressure at 1.34E-6 mbar

No obvious issues.

13:00
Power appears back for the whole ring. 

Set point 128C
Turbo normal operation - no apparent adverse effects of shutdown
Pressure at ~3E-7 mbar

Pi can again be accessed by ssh. Vacuum plot is updating again. 

YR00DA1ZB is the channel for PMT rate.

22:53

Run 15 started

Beam tests. We increased the storage time to 2min and switched to bunched beam so that we can see the beam lifetime over the cycle.

D+ Beam energy is set to 1.5 MeV.

Detectors are positioned in with servos only (left arm = 28.06mm, right arm = 29.23 mm)

No target

We observe a large peak at the start of the cycle at 750 keV. This seems to be molecular hydrogen circulating in the ring. We also see a much smaller peak at 1.5 MeV (D+)

After a period of time the 750 keV peak decreases significantly and we are left with the 1,5 MeV peak only. 

Total energy histogram after running for ~ 1 hour - attachment 1

Total xy plot after ~ 1 hour - attachment 2

We observe the large circular structure on the left hand detectors. Is this related to hydrogen or is it the beam type (bunched instead of coasting)?

In the GSI control plots for the number of ions in the ring we observe a large drop in ions circulating at the start of the cycle, and then remains fairly constant throughout the rest of the cycle. - attachment 3

This seems to confirm our hydrogen hypothesis.

23:54

Run 15 stopped, Run 16 started.

All setting the same and still no target, except beam is now coasting. We will compare to Run 15 after one hour of running.

We do not observe the circular distribution on the detector seen in the previous run. It seems this effect comes from the bunched beam. Reason?

We still observe the 750 keV peak at the start of the cycle.

Total energy histogram after running for ~ 1 hour - attachment 4

Total xy plot after ~ 1 hour - attachment 5

00:59

Run16 stopped. Run 17 started.

All settings the same except we have switched back to bunched beam.

Target now on. (X=-13700, Y=0). Target density ~ 1E11 at/cm2.

02:03

Run 17 continues

Target has increased in the average density to ~4e11 at/cm2, no changes made to nozzle position and fluctuates to 1e11 or 1e12 at/cm2.

Energy histograms and the xy plots appear similar to bunched beam with no target. The rates are slightly lower with the target for the left hand dssds, maybe target interactions destroy molecular hydrogen quicker?

Total energy histogram after running for ~ 1 hour - attachment 6

Total xy plot after ~ 1 hour - attachment 7

We will continue to run for another hour or so in this condition

Target density has decreased over the last minutes. We have tried to move the nozzle to maximise density but fluctuations make this difficult.

03:55

Increase in ADC data items statistics for aida 13 and 14 from ~20 kHz to 90 kHz

ASIC checkload has reduced the rates back to ~ 20 kHz

Total energy histogram after running for ~ 3 hour - attachment 8

Total xy plot after ~ 3 hour - attachment 9

Run 17 stopped. Run 18 started

Beam changed back to coasting. All other settings unchanged. Target on. 

04:55

Run 18 continues.

Energy histograms and the xy plots appear similar to bunched beam with no target. The rates are lower with the target than without.

Total energy histogram after running for ~ 1 hour - attachment 10

Total xy plot after ~ 1 hour - attachment 11

Note we observed fluctuations in the T2 temperature for the target. T2 is set to 80 K but rapid fluctuations were observed up to 100K. This occurred for only 5 minutes and I am not sure if it is a real effect.

07:20

Temperatures OK

System wide checks OK

Rates OK

Stats OK

Waveforms attached

Leakage current decreasing slightly.

No changes to beam or target.

PB found pictures of the original dirty assembly, before screws and components were shipped to DL.
See attached.

Looking downstream

Attachment 1 top right pair
           2 bottom right pair
           3 bottom left pair
           4 top left pair

PB "The long sides of the connectors on the 2 lowest flanges should be next to each other
and the short side of the connectors should be towards the motors."

The orientations of the other flanges do not matter.

'Long' cables to L-R connectors, 'short' cables to U-D connectors.