Excel spreadsheet showing CH2 and natC target thicknesses attached

See attached for the logbook

See attached pictures for measurements of the 7Be(p,p) chamber dimensions.

The target ladder center - Far S2 distance = 50 + 95 + 0.85 - (19.22+19.58)/2 = 126.45 mm

On 29/11/2018 at 17:40 a rough measurement of the irradiated target activity was performed using a geiger counter.

The geiger counter was a calibrated Berthold LB124, which was placed a fixed 15mm distance from each target.

The calibration was such that 1cps = 37kBq.

The LB124 counter measured a background count of 0.5cps

See attached for S2 electronics map, following channels from S2 outputs to ADC inputs

For the 19/11/2018 - 29/11/2018 beamtime only the Far S2 was in operation

To be shipped back to Edinburgh for repair:

On 29/11/2018:

Dismounted S2 2323-18 (496um), 12um mylar, diode, and diodes 0.9um mylar.

Performed general cleanup of lab. Boxed away cables and other parts. See attached pictures 1, 2, 3, and 4.

See attached picture 5, 6, 7, and 8 for status of electronics and target chamber at end of beamtime.
 

Diode Ortec 571 Amplifier Settings:

• Fine gain: 10 (0.5 ->1.5)
• Course gain: 50
• Shaping time: 0.5us
• BLR AUTO: ON
• NEG: ON (Instead of POS)
• OUT: ON (Instead of Delay)
• Internal fine gain: 1X

Diode quad TFA settings:

• No clipping cable attached
• Internal jumpers:
• W1: Invert
• W2 and W3: 200ns differentiation
• W4: T2 (not set to 50ns or OUT)
• W5: X5 course gain

Diode quad CFD settings:

• Threshold at minimum: -177.6mV
• Short delay cable attached (1ns)
• Internal jumpers:
• W1: no jumper
• W2: Top
• W3: no jumper

Oscilloscope used: Tektronix TDS 3054B

RAL Crate Configuration:

On 28/11/2018:

Mounted 12um mylar in front of far S2 - see attached pictures 1 and 2

In air: Far S2 biased to -130.0V, leak I = 1.61uA. Diode biased to -70.1V, leak I = 0.01uA -> 0.00uA. Rate meter ~ 4500Hz.

Detectors switched off

17:50 started Ecodry 1 and 2, started opening manual valve.

18:00 Manual valve fully opened, T1600 backing valve opened, Turbos switched on.

Once pressures ~ 1e-5mBar, far S2 bias = -130.0V, leak I = 1.59uA. Diode bias = -70.1V, leak I = 0.00uA.

18:08 Pressures (mBar):

• TPU1 = 3.0e-5
• TPU2 = 6.0e-5
• TPD1 = 5.2e-6
• TPD2 = 8.7e-6
• CHUP = Sensor Off
• CHDW = No Sensor

Run # 181128181421

• Run time: 1799s
• Pulser ON, as before
• Alpha source
• S2 mylar: 12um
• DT ~ 12%

Started overnight run:

Run # 181128184505

• Run time: 51706s
• Pulser ON, as before
• Alpha source
• S2 mylar: 12um
• DT ~ 8%
• See attached picture 3 for sample far S2 front strip spectrum

18:50 End of day check:

Far S2 bias = -130.0V, leak I = 1.60uA.

Diode bias = -70.1V, leak I = 0.00uA.

Pressures (mBar):

• TPU1 = 3.8e-6
• TPU2 = 1.2e-6
• TPD1 = 1.4e-6
• TPD2 = 1.6e-6
• CHUP = Sensor Off
• CHDW = No Sensor

On 29/11/2018: Alpha run stopped

9:05: Far S2 bias = -130.0V, leak I = 1.70uA. Diode bias = -70.1V, leak I = 0.00uA.

Detector biases and preamps off.

Pressures (mBar):

• TPU1 = 7.6e-7
• TPU2 = 3.5e-7
• TPD1 = 7.7e-7
• TPD2 = 7.3e-7
• CHUP = Sensor Off
• CHDW = No Sensor

Closed manual and T1600 backing valves. Stopped turbos. Stopped Ecodry 1 and 2.

Switched off Nim bin, RAL crate, and CAMAC crate

9:45 Opened venting valve

On 28/11/2018:

At 13:35: Far S2 bias = -130.0V, leak I = 1.55uA. Diode bias = -70.1V, leak I = 0.00uA.

Pressures (mBar):

• TPU1 = 3.3e-6
• TPU2 = 9,3e-7
• TPD1 = 1.2e-6
• TPD2 = 1.3e-6
• CHUP = Sensor Off
• CHDW = No Sensor

Switched off detectors, switched off pumps, closed manual and T1600 backing valves. Vented chamber.

Removed 0.9um mylar from far S2 - see attached picture 1 for mylar pre-removal. Removed far iris arm from downstream lid -> set iris to open position. Replaced far iris actuator with blank flange.

Remounted far S2 and far preamp - preamp still draws correct currents.

In air: Far S2 bias = -130.0V, leak I = 1.65uA. Diode bias = -70.1V, leak I = 0.01uA. Rate meter ~ 5500Hz.

Detectors bias off.

15:05 Ecodry 1 and 2 on, started opening manual valve.

15:20 Manual valve fully opened, T1600 backing valve opened, turbos on

15:30 Pressures (mBar):

• TPU1 = 2.2e-5
• TPU2 = 4.4e-6
• TPD1 = 4.0e-6
• TPD2 = 4.7e-6
• CHUP = Sensor Off
• CHDW = No Sensor

Far S2 biased to 130.0V, leak I = 1.59uA. Diode biased to -70.1V, leak I = 0.00uA. Ratemeter ~ 7000Hz.

Run numbers 181128153642, 181128161647, and 181128161758 are all alpha calibration runs. However DAQ connection was lost before the first run was started so the run time is not recorded for these.

Run # 181128162552

• Run time: 1408s
• Pulser ON, as before
• Alpha source
• S2 mylar: NONE
• DT ~ 20%
• See attached picture 2 for sample spectra from ADC2 Ch7 (ADC 3 in FAIR DAQ file browser)

16:45 Far S2 bias = -130.0V, leak I = 1.61uA. diode bias = -70.1V, leak I = 0.00uA.

Pressures (mBar):

• TPU1 = 2.8e-6
• TPU2 = 8.8e-7
• TPD1 = 1.2e-6
• TPD2 = 1.2e-6
• CHUP = Sensor Off
• CHDW = No Sensor

Switched off detectors, closed valves, turned off pumps, vented chamber.

On 28/11/2018:

After pulser walkthrough (see eLog entry #67)

Dismounted targets from ladder - see picture 1 and 2 for upstream and downstream sides respectively

Mounted alpha source on ladder - see pictures 3 and 4 for upstream and downstream sides respectively

New target ladder configuration is now:

Dismounted thin CH2 target 50 - it was still attached to the collimator.

Remounted far S2 with 0.9um mylar, remounted far iris arm.

In air, pressures (mBar):

• TPU1 > 1000
• TPU2 > 1000
• TPD1 = 170 (above range)
• TPD2 = 73 (above range)
• CHUP = Sensor Off
• CHDW = No Sensor

Far S2 biased to -130.0V, leak I = 1.55uA. Diode biased to -70.1V, leak I = 0.01uA.

Ratemeter ~9200Hz.

Switched off detectors.

12:05 Ecodry 1 and 2 on. Started opening manual valve.

12:20 Manual valve opened fully, T1600 backing valve opened. Started turbos.

12:30 Pressures (mBar):

• TPU1 = 3.0e-5
• TPU2 = 5.1e-6
• TPD1 = 5.1e-6
• TPD2 = 7.5e-6
• CHUP = Sensor Off
• CHDW = No Sensor

Far S2 biased to -130.0V, leak I = 1.52uA. Diode biased to -70.1V, leak I = 0.01uA.

Rate meter ~ 7000Hz. Ladder set to position #4 - alpha source. Rate meter still ~ 7000Hz.

Run # 181128123940

• Run time: 3428s
• Pulser ON, as before
• Alpha-source
• S2 mylar: 0.9um
• DT ~ 22%
• See attached picture 5 for sample Far S2 front strip spectrum

On 28/11/2018:

Performed pulser walkthrough, Run # 181128090835

• Run time: 1986s
• Pulser ON, amplitude changed
• Target: None
• Beam: None
• DT ~ 11%
• See attached picture 1 for sample pulser walkthrough spectrum, ADC 2 channel 3 (ADC 3 in DAQ file browser)

Pulser amplitudes swept through (measured amplitude checked after collecting pulser walkthrough to ensure no additional load was placed on pulser):

After walkthough pulser amplitude setting set back to 70000, all other settings left unchanged

Far S2 and diode biases switched off. Preamp power off. Line valve and FCC valve closed. Turbos off. Manual and T1600 backing valves closed. Ecodry 1 and 2 off. Waited for turbos to spin down.

By 10:20 turbos had finished spinning, vented chamber ready to mount alpha source.

On 27/11/2018:

Run # 181127200709

• Run time: 46329s
• Pulser ON, as before
• No target
• No beam
• Lab background
• DT ~ 12%
• See attached picture 1 for sample far S2 front strip spectrum. See attached picture 2 for diode spectrum.

At 20:00:

Far S2 bias = -130.0V, leak I = 1.52uA. Diode bias = -70.1V, leak I = 0.00uA. Preamps drawing correct current.

Pressures (mBar):

• TPU1 = 7.0e-6
• TPU2 = 1.9e-6
• TPD1 = 1.5e-6
• TPD2 = 1.7e-6
• CHUP = Sensor Off
• CHDW = No Sensor

Rate meter ~ 5000Hz

On 28/11/2018:

At 8:55 Far S2 bias = -130.0V, leak I = 1.67uA. Diode bias = -70.1V, leak I = 0.00uA.

Rate meter ~ 4100Hz

Pressures (mBar):

• TPU1 = 8.5e-7
• TPU2 = 6.3e-7
• TPD1 = 7.5e-7
• TPD2 = 6.5e-7
• CHUP = Sensor Off
• CHDW  No Sensor

Stopped lab background run

On 27/11/2018:

After tuning beam (see previous eLog entry # 64)

Run #181127193908

• Run time: 1589s
• Pulser ON, as before
• Target: CH2 50
• Beam: 1.5MeV 6Li 1+
• See attached picture 1 for sample S2 front strip spectrum. See attached picture 2 for diode spectrum

On 27/11/2018:

Started tuning for 1.5MeV 6Li 1+. Set ladder to position #2 - Blank 10mm. Far S2 iris closed.

Run # 181127151653

• Run time: N/A
• Pulser ON, as before
• Target: Blank 10mm
• Beam: 1.5MeV 6Li 1+

Moved ladder to position #5 - natC III

Run # 181127152055

• Run time: N/A
• Pulser ON, as before
• Target: natC III
• Beam: 1.5MeV 6Li 1+
• DAQ Crashed

Restarted FAIR DAQ

Run # 181127153422

• Run time: N/A
• Pulser ON, as before
• Target: natC III
• Beam: 1.5MeV 6Li 1+
• Run stopped incorrectly by user

Run # 181127153506

• Run time: 489s
• Pulser ON, as before
• Target: natC III
• Beam: 1.5MeV 6Li 1+

Run # 181127155040

• Run time: 187s
• Pulser ON, as above
• Target: natC III
• Beam: 1.5MeV 6Li 1+

Moved ladder to position #3 - CH2 XVI

Run # 181127155607

• Run time: 908s
• Pulser ON, as above
• Target: CH2 XVI
• Beam: 1.5MeV 6Li 1+
• DT ~ 15%

Struggling to see beam in diode for all of these past runs.

Opened iris to use far S2 as diagnostic tool - beam is stopped in thick CH2 targets so detector is safe even at its small angular coverage (~5 - 15 degrees)

Run # 181127161508

• Run time: 14s
• Pulser ON, as before
• Target: CH2 XVI
• Beam: 1.5MeV 6Li 1+

No high rate seen

Run # 181127161656

• Run time: 194s
• Pulser ON, as before
• Target: CH2 XVI
• Beam: 1.5MeV 6Li 1+
• DT ~ 12%

Still struggling to see beam on diode

Found lemo cable used for diode timing between CFD and Logic OR has exposed cabling -> replaced lemo. See attached picture 1 for old lemo.

Run # 181127163416

• Run time: 106s
• Pulser ON, as before
• Target: CH2 XVI
• Beam: 1.5MeV 6Li 1+

Far iris opened

Run # 181127163848

• Run time: N/A
• Pulser ON, as before
• Target: CH2 XVI
• Beam: 1.5MeV 6Li 1+

Realised we were making a mistake when looking at the DAQ spectra. We were looking at ADC 2 (labelled as 3 on DAQ file browser) channel 16 (an S2 back strip) when we should have been looking at ADC 3 (labelled as 4 on DAQ browser) channel 16 for the diode

Closed iris, checked beam current. Using 10mm aperture FCC = 1pA.

Opened iris, moved ladder to position #3 - CH2 XVI

Run # 181127164749

• Run time: 556s
• Pulser ON as before
• Target: CH2 XVI
• Beam: 1.5MeV 6Li 1+

Ready to mount thin CH2 target.

At 16:55: Far S2 bias = -130.0V, leak I = 1.75uA. Diode bias = -70.1V, leak I = 0.00uA.

Pressures (mBar):

• TPU1 = 9,2e-7
• TPU2 = 3.4e-7
• TPD1 = 6.4e-7
• TPD2 = 6.8e-7
• CHUP = Sensor Off
• CHDW = No Sensor

Switched off detector biases, switched off preamps. Closed FCC valve. Closed line valve. Turbos off. T1600 backing and manual valves closed. Ecodry 1 and 2 off.

Vented chamber. Mounted thin target CH2 50 ~ 50mm from Far S2 - see attached picture 2.

Left 0.9um mylar in front of far S2.

Remounted far S2 and far preamp. With detectors on in air trigger rate ~ 9kHz.

19:00 Ecodry 1 and 2 on. Started opening manual valve.

19:15 pressures below 10 mBar, manual valve fully opened. T1600 backing valve opened. Turbos on.

19:25 Pressures (mBar):

• TPU1 = 3.2e-5
• TPU2 = 8.1e-6
• TPD1 = 6.0e-6
• TPD2 = 8.3e-6
• CHUP = Sensor Off
• CHDW = No Sensor

Far S2 biased to - 130.0V, leak I = 1.52uA. Diode biased to -70.1V, leak I = 0.00uA.

Closed iris, set ladder to position #2 - blank 10mm

See 1 -> 2 pA beam on FCC, opened iris ready for measurement.

On 27/11/2018:

At 8:40 Far S2 bias = -130.0V, leak I = 1.74uA. Diode bias = -70.1V, leak I = 0.00uA.

Pressures (mBar):

• TPU1 = 8.3e-7
• TPU2 = 3.4e-7
• TPD1 = 6.5e-7
• TPD2 = 6.5e-7
• CHUP = Sensor Off
• CHDW = No Sensor

Preamps still drawing necessary currents.

Stopped overnight run of 3.0MeV 7Be 2+ on CH2 XIX

Checked beam current: FC4 = 2pA.

Moved ladder to position #5 - natC III

Run # 181127085408

• Run time: 627s
• Pulser ON, as before
• Target: natC III
• Beam: 3.0MeV 7Be 2+
• DT ~ 23%
• See attached picture 1 for sample S2 front strip spectrum. See attached picture 2 for diode spectrum.

Moved ladder to position #2 - 10mm aperture

Run # 181127090808

• Run time: 601s
• Pulser ON, as before
• Target: Blank 10mm aperture
• Beam: 3.0MeV 7Be 2+
• DT ~ 10%
• See attached picture 3 for Far S2 innermost strip spectrum.

Moved ladder to position #7 - CH2 XIX

Run # 181127092128

• Run time: 663s
• Pulser ON, as before
• Target: CH2 XIX
• Beam: 3.0MeV 7Be 2+
• DT ~ 10%
• See attached picture 4 for sample S2 front strip spectrum. See attached picture 5 for diode spectrum.

* End of 7Be beam *

On 26/11/2018:

Tuned beam for 3.0MeV 7Be 2+. Far S2 iris was closed during tuning.

After tuning, using 10mm aperture FCC = 5pA, using 3mm aperture FCC = 4pA.

Set ladder to position #7 - CH2 XIX

Run # 181126190248

• Run time: 1298s
• Pulser ON, as before
• Target: CH2 XIX
• Beam: 3.0MeV 7Be 2+

Left beam running and data collecting overnight

Run # 181126192446

• Run time: 47915s
• Pulser ON, as before
• Target: CH2 XIX
• Beam: 3.0MeV 7Be 2+
• See attached picture 1 for sample S2 front strip spectrum. See attached picture 2 for diode spectrum.

On 26/11/2018, after changing the far S2 mylar foil (see previous eLog entry #60):

Checked pulser frequency on oscilloscope: 19.31Hz

Began tuning 3MeV 7Li 2+.

After tuning, FC4 = 1nA. Using 10mm aperture FCC = 313pA. Using 3mm aperture FCC = 250pA.

Ladder set to position #7 - fresh C2 XIX target. Far S2 iris opened.

Run # 181126162248

• Run time: 753s
• Pulser ON, as before
• Target: CH2 XIX
• Beam: 3.0MeV 7Li 2+
• DT ~ 18%

Set ladder to position #5 - natC III

Note: now saving to /Local_Parts/PartODF/

Run # 181126163853

• Run time: 73s
• Pulser ON, as before
• Target: natC III
• Beam: 3.0MeV 7Li 2+
• DT ~ 20%
• Observe 7Li passing through target

Moved ladder to position #2 - blank 10mm aperture

Run # 181126164509

• Run time: 67s
• Pulser ON, as before
• Target: Blank 10mm
• Beam: 3.0MeV 7Li 2+

Still see scattered beam at low S2 strips #'s - see attached picture 1 for spectrum of the innermost S2 strip.

Performed further beam tuning to improve transmission.

After tuning: Using 10mm aperture FCC = 415pA (280 - 420pA). Using 3mm aperture FCC = 290pA.

Moved ladder to position #3 - CH2 XVI. Bombarded target with 3.0MeV 7Li 2+ and checked rate histogram on FAIR DAQ. ADC1 CH24 didn't show higher rates compared to other channels (eg ADC 1 CH10)

Moved ladder to position #7 - CH2 XIX

Run # 181126183711

• Run time: 616s
• Pulser ON, as before
• Target: CH2 XIX
• Beam: 3.0MeV 7Li 2+
• DT ~ 14%
• See attached picture 2 for sample S2 front strip spectrum. See attached picture 3 for diode spectrum.

On 26/11/2018, after 6.0MeV 7Be and 7Li beam measurements:

At 11:15:

Far S2 bias = -130.0V, leak I = 1.60uA. Diode bias = -70.1V, leak I = 0.00uA.

Pressures (mBar):

• TPU1 = 8.5e-7
• TPU2 = 3.1e-7
• TPD1 = 6.2e-7
• TPD2 = 6.3e-7
• CHUP = Sensor Off
• CHDW = No Sensor

Detectors and preamps switched off. Turbos off. Line valve closed. Manual and T1600 backing valves closed. Ecodry 1 and 2 off.

Waited for turbos to spin down.

Opened vent valve at Turbo Entrance 3. The automatic FCC valve immediately closed -> interlock tripped downstream of chamber and stopped turbo at FCC.

With FCC valve closed (allowing the chamber to continue venting) we restarted turbo at FCC -> spun up to operating 1000 Hz.

Once chamber finished venting, the far S2 was removed and its 12um mylar was replaced with 0.9um mylar ready for beam measurements at Elab = 3MeV. See picture 1 for 0.9um mylar mounted in front of far S2.

Far S2 remounted with far iris arm. Far S2 preamp remounted.

Preamp power on, currents drawn are good. Far S2 biased to -130.0V, leak I = 1.53uA. Diode biased to -70V, leak I = 0.00uA.

Noise looked ok. Detector biases off.

12:50 Ecodry 1 and 2 on. Started opening manual valve.

13:05 manual valve opened fully. T1600 valve opened.

13:10 Turbos on, pressures reached ~9e-5 mBar

Far S2 bias = -130.0V, leak I = 1.48uA. Diode bias = -70.1V, leak I = 0.00uA.

Set new RAL thresholds whilst monitoring rate: (counting from left of RAL rack)

• RAL #1 and 2: 20mV
• RAL #3: 15mV
• RAL #4 and 5: 10mV
• RAL #6: 15mV

13:25 Pressures (mBar):

• TPU1 = 1.0e-5
• TPU2 = 2.8e-6
• TPD1 = 2.5e-6
• TPD2 = 3.3e-6
• CHUP = Sensor Off
• CHDW = No Sensor

On 26/11/2018:

The accelerator and chamber setup were still operating after the overnight run.

Far S2 bias = -130V, leak I = 1.59uA. Diode bias = -70.1V, leak I = 0.00uA.

8:35 pressures (mBar):

• TPU1 = 8.6e-7
• TPU2 = 3.1e-7
• TPD1 = 6.1e-7
• TPD2 = 6.3e-7
• CHUP = Sensor Off
• CHDW = No Sensor

Checking for beam-induced background, moved target ladder to position # 2 - blank 10mm aperture

Run # 181126084821

• Run time: 1204s
• Pulser ON, as before
• Target: Blank 10mm
• Beam: 6.0MeV 7Be 2+

Using blank 10mm frame FCC = 6pA

Stopped run - CSSM magnet was switched on halfway through. This this the magnet located immediately downstream of the chamber and we were worried about it affecting the noise. Switched off CSSM magnet.

Run # 181126090936

• Run time: 1239s
• Pulser ON, as before
• Target: Blank 10mm
• Beam: 6.0MeV 7Be 2+
• DT ~ 8%

Moved ladder to position #5 - natC III

Run # 181126093314

• Run time: 1416s
• Pulser ON, as before
• Target: natC III
• Beam: 6.0MeV 7Be 2+
• DT ~ 8%

Moved ladder to position #2 - blank 10mm aperture. Closed far S2 iris and switched beam to 6.0MeV 7Li 2+.

Using 10mm aperture FCC = 360pA. Using 3mm aperture FCC = 300pA.

Moved ladder to position #4 - CH2 XVIII. Opened Far S2 iris.

Run # 181126105357

• Run time: 1383s
• Pulser ON, 25Hz
• Target: CH2 XVIII
• Beam: 6.0MeV 7Li 2+
• DT ~ 12%
• See attached picture 1 for sample Far S2 front strip. See attached picture 2 for diode spectrum.

Ready to replace Far S2 12um mylar with 0.9um mylar protective foil