Header: end of beamtime - modules reading
Ender: 
==================================================== 
Date				: 15 / 11 / 2017
Time			        : 08:42
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Run Scalers (approx rates)
0- Ungated                      : 2
1- Gated                        : 0 (MIDAS not running)
2- dE                           : 96k
3- E                            : 88
4- HI                           : 2
5- Pulser                       : 2
6- Clock			: 969
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Beam energy (MeV/u)		: no beam
Beam intensity (epA)	        : 
Target				: (CH2_33+10+01)
Ladder position	(mm)	        : (97.61)
HI Degrader foil (um)		: (15 um)
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
del_E voltage (V)		: -40
del_E leakage (uA)		: 0.69
E voltage (V)			: -350
E leakage (uA)		        : 2.06
E_hi voltage (V)		: -14
E_hi leakage (uA)		: 3.295
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
PA power (Up, positive)	(A)	: 1.55
PA power (Up, negative) (A)     : 0.58
PA power (Down, positive) (A)	: 0.80
PA power (Down, negative) (A)   : 0.26
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Pressure (IMG1)	(mbar)	        : 7.5 x 10^-6
Pressure (old gauge) (mbar)     : 1.9 x 10^-5
Pressure (SEC)	(mbar)         	: 4.9 x 10^-6
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Temp (Chiller)	deg	        : -10.0
Temp (chamber)	deg	        : +5.0
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Comments: 
08:44 turned Detector Bias off, Preamps off, Change chiller to 20.0 deg and after heating up, switched it off
====================================================

Please see https://elog.ph.ed.ac.uk/ISOLDE/203 for the E_cm calculations.

Presently, we are scheduled for 9 days: 
  Nov 26-28 are three (3) days nominally for beam development
  Nov 29-Dec 4 are six (6) days nominally for physics data taking

It is not required to use all beam dev time at the beginning of the run, and we can take data in here with a beam we like before moving on.  We do, however, have to care for the fact that over the weekend of 1-2 Dec that we cannot 
change the beam (no operators) nor our target (no RP).

==Tentative Run Plan==
1 day for ion source and 2.8 MeV beam dev
1 day for High E_cm statistics, using the 6 um Ti foil
1 day for lower energy beam dev (for use with mid E_cm)
1.5 days for Mid E_cm statistics
(Switch back to 2.8 MeV/u beam, takes under 1 hour)
4.5 days for Low E_cm

---Total 9 days---

==Conditions==

The High E_cm and Low E_cm can not only share the same 2.8 MeV/u beam, which is considered a fairly easy beam since this is the nominal REX energy.

The Mid E_cm requires its own beam, and we have two conditions to choose from.  

=High E_cm=
  6um Ti, 2.8 MeV/u beam: Ecm=5.56-5.86 MeV
    Pro: Beam energy is 'easy'
    Pro: Can share E_beam with Low E_cm

=Mid E_cm=
  2.5um HAVAR, 2.2 MeV beam: Ecm=4.76-5.06 MeV
    Pro: Beam energy was delivered previously in 2012
    Con: Physics protons show up below the elastic ones

  3um Ti, 1.88 MeV/u beam: Ecm=4.27-4.58 MeV
    Pro: Physics protons show up above the elastic ones
    Pro: We already made the gas cell
    Pro: Very similar E_cm to Margerin (but different conditions)
    Con: Beam energy might be difficult to achieve (but possible)

=Low E_cm=
  12.5 Al, 2.8 MeV/u beam: Ecm=3.41-3.72 MeV
    Pro: We have the foil installed and tested
    Pro: Beam is 'easy'
    Pro: Can share E_beam with High E_cm

Transcription of paper logbook for runs.  Please check as I cannot read all the writing.

Wednesday 13/9/2017

Detectors installed:
2083-9, 74 um, dE layer
3080-23, 1012 um, E layer
2410-23, 65 um, HI layer

Det.	Bias	Leak
dE	-24	0.46
E	-350	2.61
HI	-14	1.05

Runs 0 - 5 : junk

Run 10
  Header: Alpha calibration
  Date: 13/9/2017
  Start: 18:03 (CERN)
  Stop: 18:12
  Note: Some cables disconnected to test CANNOT READ

Run 11
  Header: Alpha calibration
  Date: 13/9/2017
  Start: 18:16
  Stop: 
  Notes:
  ADC	Ch	Notes
  1	0-15	ok
  1	16-31	
  2	0-15	7+8 only pulser
  2	16-31	ok
  3	0-15	only pulser
  3	16-31	19 low gain (other notes but crossed out)
  4	0-15	6 low (noise?), rest fine
  4	16-31	only pulser
  5	0-15	"probably okay"
  5	16-31	"probably okay"
  6	0-31	"probably okay"

-------
Thursday 14/9/2017

Det.	Bias	Leak
dE	-24	0.44
E	-351	2.4
HI	-14	0.95

Run 12
  Header: 
  Date: 14/9/2017
  Start: 11:50
  Stop: 12:08
  Note: Bad.  Pulser switched on through run

Run 13
  Header: Pulser ON
  Date: 14/9/2017
  Start: 12:07
  Stop: 
  Notes: good
  ADC	Notes
  1	ch 0 ... bad resolution in pulser
  2	ch 7,8 no alphas
  3	ch 0 low gain, ch 0-15 almost only pulser but maybe shieled from alpha source & low noise
  3	ch 24 low resolution
  4	ch 6 no alphas, ch 7 low gain for alphas but not for pulser
  4	ch 16-31 no alpha (maybe shielded & low noise)
  5	okay
  6	okay

 TDC missing #1-32, #1-80,120,123

14:00 before turning off biases:

Det.	Bias	Leak
dE	-24	0.4
E	-351	2.15
HI	-14.5	0.89

15:15 - Vent to remove dE layer

Extra SSD cable arrives

TDC mapping

Det.	Side	TDC ch
dE	p+n	16-63
E	n+n	64-79
HI	p+n	80-127

Bias detectors
Det.	Bias	Leak
E	-350	1.83
HI	-14	0.8

Run 15
  Header:
  Date: 14/9/2017
  Start: 18:22
  Stop: 18:25
  Notes: Bad.  Pulser to 2 Hz

Run 16
  Header: Alpha source in front of E detector 
  Date: 14/9/2017
  Start: 18:31
  Stop: 
  Notes: Bad.  CANNOT READ

Run 17
  Header: 
  Date: 14/9/2017
  Start: 18:32
  Stop:
  Notes: Bad.  ADC #4 ch 6, 7 bad.  
  Switch U7e8 (??) (n+n side p+n) from E detector
  Problem moved -> CANNOT READ

-------
Friday 15/9/2017

10:00 bias detectors

Det.	Bias	Leak
E	-351	2.13
HI	-14.5	0.88

T: -4.9 C
P: 4.9 x 10^-6 mbar

Run 19
  Header: alpha-calib of E layer 3080-23
  Date: 15/9/2017 
  Start:  
  Stop: 
  Notes: 
  No TDC data ...?
  ADC	Ch	Comments
  1	0-31	Pulser (only) in all channels except ch2 which has a few counts across whole spectrum (hair)
  		Resolutions range from 2.0 -> 7.0
		Pulser centroid ~ channel 2800 in all spectra (except ch 2 of course)
  2	0-15	Pulser in all channels, ~channel 2000 (i.e. similar gains)
  		Resolution ~ 2.0 ch, except ch 8 sigma = 4.5 ch
  2	16-31	Pulser in all channels at ~channel 3000
		Resolution ~ 2.0 ch, excehpt ch 24 which is 6.7 ch & ch 16: 4.35 ch.
  3	0-31	Pulser & alphas in all channels
  		(Not 19...see below)
		Resolution is *poor* in ch0
		All gains look similar
		Alpha spectra in similar channel numbers as for other ADCs, but pulser at only 1/2 the channel number
		(A drawing is given to compare ch0 to ch1-15.)
  3	19	Gain seems very low
  		Pulser @ channel 430, alphas @ channel 200
			So about 1/5 of gain of others in ADC 3 channels
  4	0-15	All but ch 6 very similar (good)
  		ch 6: Pulser in similar channel to other spectra, but narrower (~4 ch, c.f. ~8-10 channels for other spectra.)
		      And alphas are much lower gain, appearing ~ ch 70, c.f. 1100 for others
  4	16-31	All okay.  Triple alpha @ ~ channel 1150, pulser @ 2800
  5	0-31	All okay (though low gain - deliberately)
  6	0-31	Ok, see above for ADC 5 notes.

Det.	Bias	Leak
E	-351	2.08
HI	-14.5	0.88

Restart MIDAS; VME crate
  => TDC signals return

12:02 Removed E layer #3080-23 (HI layer #2410-23 remains unchanged)

New 1035 um Si installed #2951-22.  It uses a different bias voltage than the previous E layer (-160 vs. -351 V)

12:50 Stop DAQ (run 22 larger than necessary)

Run 23 (?? no note)
  Header: 
  Date: 
  Start: 
  Stop: 
  Notes: 
  ADC	ch	Comments
  1	0-15	Pulser only, similar gains
  		ch 2 no pulser (hair)
		No alphas (unsurprising!)
  1 	16-31	Pulser only, similar gains
  		All okay.
		(No alphas, unsurprising!)
  2	0-31	Pulser only, no alphas, similar gains
  		All okay
  3	0-15	Pulser + alphas
  		alphas in all strips
		alpha similar gains and resolutions
		pulser in ch 0 at ~1/2 amplitude
  3	16-31	Pulser + alphas.
  		ch 19 pulser and alphas at much reduced channel number ~1/5 gain
  4	0-15	Pulser + alphas
  		ch 6 no alphas - Pulser narrow (no detector capacitence?)
		ch 7 alphas at reduced gain (~1/5), pulser narrow
  4 	16-31 	All good
  5	0-31	All good (low gains - by design)
  6	0-31	All good (low gains - by design)

  v767 #1 TDC
  	ch	Comments
	0	1 peak
	1-15	No data
	16-31	1 peak
	32	No peaoks
	33	1 peak + 1 small peak
	34-44	2 peaks
	45-47	1 peak
	48	1 peak + hair
	49-52	1 peak
	53	1 peak + hair
	54-56	2 peaks
	57-63	1 peak
	64-79	broad region of data (alphas?)
	80-86	1 peak
	87	1 peak + 1 smaller peak
	88	Mainly 1 or 2 peaks + lots of hair
	89	1 peak
	90,91	2 peaks
	92-95	1 peak
	96	1 peak
	97-127	Mainly 1 peak

Cable for 1 mm E detector must be faulty

Before opening the chamber:
Det.	Bias	Leak
E	-160	1.12
HI	-14.5	0.92

(When trying to switch the cable to the SSD, apparently it was not fully connected.  Some time is lost to pump, vent, check, etc)

After new cabling is confirmed and evacuation is complete:
Det.	Bias	Leak
E	-160	1.17
HI	14.5	0.96

Run 24
  Header: Check new cable
  Date: 15/9/2017
  Start: 16:18 (UK)
  Stop: 16:35 (UK)
  Notes:
  ADC	ch	Comments
  3	0-15	okay
  3	16-31	ch 19 low gain
  4	0-15	ch 5, ch 7 low gain
  4	16-31	okay

dE detector: 2083-9, 74 um thick, V_depletion=12V; V_operating=24 V

E detector:  3080-23, 1012 um thick, V_d=110; V_o=350 V

HI detector: 2410-23, 65 um; V_d=7 ; V_o=14 V

Connect bias cables 14,15,16 (dE,E,HI)

Quad Bias Supply ports 1,2,3 (dE,E,HI). There seems to be some offset voltage on them (V1=3V, V2=7V, V3=1V, V4=4V) Seems to go dowon when preamps are on.

Leakage Currents

dE:

E:

HI:

ADC#1 0-31: p+n dE

ADC#2 32-48: n+n dE

ADC#2 49-64: p+n dE

ADC#3 0-31: p+n E

ADC#4 32-48: n+n E

ADC#4 49-64: p+n E

ADC#5 0-31: p+n HI

ADC#6 32-48: n+n HI

ADC#7 49-64: p+n HI

(Wrapped up)

    Cell b : 15um Al exit, 12.5um Al entrance.  L/R ~0.4Torr/hr overnight (in vacuum)

    Cell d : 15um Al exit, 3um Ti entrance. L/R ~ 0.8Torr/hr overnight (in vacuum)

(In testing)

    Cell a : 15um Al exit, undecided which window will be used. At current epoxy on screw in joints for arms of cell. Testing in atmosphere to see if can reach adequate seal with this.

Assuming 200 Torr helium target., elastic and reaction peaks do not have signifcant overlap unless stated:

3um Ti, 1.88 MeV/u beam: Ecm=4.27-4.58 MeV

3um Ti, 2.2 MeV/u beam: Ecm=5.50-5.80 MeV

12.5 Al, 2.8 MeV/u beam: Ecm=3.41-3.72 MeV

2.5 um HAVAR, 1.88 MeV/u beam: Ecm=3.54-3.85 MeV (peaks overlap)

2.5um HAVAR, 2.2 MeV beam: Ecm=4.76-5.06 MeV

6um Ti, 2.2 MeV/u beam: Ecm=3.15-3.47 MeV

6um Ti, 2.8 MeV/u beam: Ecm=5.56-5.86 MeV

There is an option to see when the beam is gone if it is due to lasers or due to the accelerator.

- window next to proton requestion switch

- put middle faraday cup in

- switch mass to stable copper 63Cu

- check faraday cup current. should be around 1-3 nA

- switch back to 59Cu

-Faraday Cup out

- further descption is on a piece of paper upstairs

Faraday cup readout at the end of our chamber should change based on whether or not the target is in and also the 59Cu beam energy.

The effect could be as much as 10 to 20%.  At some point, we should check the Faraday cup reading with the CH2 target and with the empty target.

> Faraday cup readout at the end of our chamber should change based on whether or not the target is in and also the 59Cu 
beam energy.
> 
> The effect could be as much as 10 to 20%.  At some point, we should check the Faraday cup reading with the CH2 target 
and with the empty target.

For comparison, csd predicts 5.00MeV/u 59Cu?+ -> 4.66MeV/u 59Cu24+ following the 0.5mg/cm2 (CH2)n target

w29> csd

 Charge State Distributions in Solid and Gaseous Targets

 Is target solid(1) or gaseous(2) ? 1

 Enter energy (MeV), mass (amu) and charge of ion: 275 59 29

 Enter minimum and maximum charge states: 1 29

 Energy: 275.0   QNOT:  24.1    RHO:   1.3    EPS:  -64.6

 Charge   % 
    1     0.0
    2     0.0
    3     0.0
    4     0.0
    5     0.0
    6     0.0
    7     0.0
    8     0.0
    9     0.0
   10     0.0
   11     0.0
   12     0.0
   13     0.0
   14     0.0
   15     0.0
   16     0.0
   17     0.0
   18     0.0
   19     0.1
   20     0.5
   21     2.7
   22     9.6
   23    21.9
   24    30.3
   25    23.6
   26     9.4
   27     1.7
   28     0.1
   29     0.0

 Options available: 
    end(1) , medium(2) , ion(3) , charge states(4)

From Ruchi's friend Rob.

ADC offsets calculated using data files R42-r47

ADC gains calculated using data files R26, R30 & R38

Re-sorting data files R26, R30 & R38 using calculated ADC offsets and gains
the 241Am alpha peak centroids are at

E_HI       86  c(3) =  5.380*10/86 = 0.625581
E_alpha   251  c(2) =  5.380*10/251 = 0.214343
dE_alpha 1021  c(1) =  5.380*10/1021 = 0.0526934

Calculate energies (100keV bins) for channel i using 

          e(i) = INT( c(n) * gain(i) * ( data(i) - offset(i) ) + 0.5 )

Approximately 5-10% of events overnight were 'bad' i.e. missing TDC data

Checked the CAEN V767 trigger/channel 0 logic (without beam) this morning
and observed that the delayed event trigger was within 20-30ns of trailing
edge of MON2 (trigger accepted). Increased width of MON2 from 100ns to 150ns.

Check whether this change reduces or eliminates 'bad' events when beam 
returns.

CAEN V560 Scaler channels #0-7 have been added to the EbyE datastream by adding
per event readout of defined VME registers identified as group 31, items 0-15

w26> cat /MIDAS/experiments/daq/VMEDataSources
32 0x00660010 32 31 0
32 0x00660014 32 31 2
32 0x00660018 32 31 4
32 0x0066001c 32 31 6
32 0x00660020 32 31 8
32 0x00660024 32 31 10
32 0x00660028 32 31 12
32 0x0066002c 32 31 14

Scan is attached, including all items denoted in the loan book as being taken to ISOLDE.

This will be useful for a complete compilation of our inventory.

By the end of beam tuning (around 6pm), beam transmission between Faraday cups at the end of SEC and at end of Edinburgh chamber:
~100% through 10mm collimator (empty target frame)
> 50% thought 3mm collimator

 

Beam energy measurements can be found in the electronic logbook for ISO-REX-HIE

https://op-webtools.web.cern.ch/elogbook/

measurements for all energies were:

E = 4.985 MeV/u. dE (FWHM)= 0.6%

E=4.715 MeV/u, dE(FWHM)=0.6%

E = 4.29 MeV/u dE(FWHM) = 0.5%

E=3.99 MeV/u .Energy spread around 0.5%.

E = 3.61 MeV/u with dE(FWHM) = 0.55%

http://npg.dl.ac.uk/TargetRequests/

https://www.technologysi.stfc.ac.uk/Pages/Target-frames.aspx

The standard frame is NSF CP type 3

Asked for 5x 100 ug/cm^2 Au.