ATLAS SCT Testbeam : July 2002

ATLAS SCT Testbeam

4 - 17 July 2002 beamtest at CERN H8

Shifts

Change of shift arrangements

Due to shortage of people in the latter part of the run, we decided at the run meeting of Wednesday 8th to change to two long shifts per day, with no over-night component, viz: 06 - 16 and 16 - 02. This reduces the requirement for people by half and eliminates full night shifts while losing a small fraction of beam time.

Instructions for the evening shift: Try to arrange the last scan to finish between about 01:00 and 02:00. If there remains about 2 or 3 hours, use a reduced TBSpecial(nevents) for the last scan instead of TBBiasPoint(), remembering to set bias voltages manually with TBSetBias(v1,v2,v3). I've tried to arrange for the last scans to be of lower priority. When the last scan finishes, ramp down HV, LV off, leave SCTDAQ running, leave chillers on. Make one last check of the zone from outside the fence, noting temperatures of boxes and chillers.

Instructions for morning shift: As soon as you arrive, Ramp HV UP and switch LV on. Check carefully the leakage currents and temperatures for a few minutes (DCS->Log). Use TBSetBias(vunirr,virr,v308) to set the biases for the next scan. Watch temperatures and currents making sure all are stable. Start a scan with TBBiasPoint(vunirr,virr,v308) after at least 20 minutes has elapsed from the time bias was first ramped. Take a single reference run of 10000 events with Qthr = 1.5. Continue the program.

Fri 5 Day installing
Evening Thomas
Night Matt / Bruce
Sat 6 Day Jose Enrique / Sergio
Evening Gareth
Night Sandor / Michael
Sun 7 Day Gaby
Evening Thomas
Night Alan / Matt
Mon 8 Day Bettina / Mauro
Evening Michael
Night Jose Enrique / Sergio
Tue 9 Day Monica / Bettina
Evening Bruce
Night Sandor / Gaby
Wed 10 Day ### Machine Development ###
16 - 02 Matt
Thu 11 06 - 16 Gareth / Monica
16 - 02 Michael / Thomas
Fri 12 06 - 16 Jose Enrqiue / Sergio
16 - 02 Alan
Sat 13 06 - 16 Sandor
16 - 02 Jose Enrique / Sergio
Sun 14 06 - 16 Monica / Barbara
16 - 02 Gaby
Mon 15 06 - 16 Mauro
16 - 24 Gareth
Tue 16 24 - 06 Harris
08 - 17 Sandor / Gaby
17 - 04 Rainer / Monica
Wed 17 06 - 10 Monica
10:00 ### Finish at 10:00 and de-install ###

Schedule : 04 - 17 July

Preparation of modules in B186 (contact: Lars Eklund): 01 - 03 July
Installation in Beamline: Thursday 04 July
Start of SCT Beam: 09:00 Thursday 04 July (*** note unusual day ***)
Running: 09:00 Thurs 04 - 12:00 Wed 17 July
Removal from beamline: 12:00 Wed 17 July - 12:00 Thurs 18 July

Modules

10 Slots divided: 
 2 Irradiated Endcap Outer K5  (K305, K308)
 2 Unirradiated Endcaps - one outer (303), one inner (304)
 2 Irradiated KEK Barrels (0007, 0034)
 2 Unirradiated UK Barrels  (0053, 0056)
 1 Unirradiated Barrel Module for reference (0026)
 2 KB modules from CERN/Geneva (100, 102)

Evolving module table:

DAQ ID	Slot	Name	Type	Irrad?	From/Contact	Comment
5	10	K5-305*	K5 Outer	Yes	Freiburg/Paul	\The modules from the
4	9	K5-308*	K5 Outer	Yes	Freiburg/Paul	/ May irradiation
10	8	K5-303	K5 Outer	No	Freiburg/Jo	Endcap Comparison Module
3	7	0053	Barrel	No	UK	Site qualification modules
2	6	0007*	Barrel	Yes	KEK	\ Irradiated barrels
1	5	0034*	Barrel	Yes	KEK	/ from the June PS irradioation
0	4	0056	Barrel	No	UK	Site qualification modules
9	3	kb_100	KB	No	CG/Mariane
8	2	kb_102	KB	No	CG/Mariane
7	1	K5-304	K5 Inner	No	NIKHEF/Fred
6	0	0026	Barrel	No	Joern	Efficiency Reference (fixed bias & threshold)

Module Characterisation

The five barrels including the two irradiated in June were characterised by Lars in building 186: link
The two irradiated endcaps (k305, k308) from the May PS irradiated and May/June beamtest were further investigated and optimised by Monica in building 161: (files are tbJul2002/sctvar/k5_305_b161_before and tbJul2002/sctvar/k5_308_b161_before) with a new current matrix. It was decided in the endcap modules meeting to run these two modules at Vcc = 3.8V and Vdd = 4.2V.
The two KB modules have been further studied by Mariane in the days preceding the beamtest with the modules in situ at H8 (but out of the beam). The config files in use in the beam now are those that were in the config directory on Thursday 4 July.
The two unirradiated endcaps had config files provided by Lars from earlier measurements at CERN. They were not recently recharacterised.
A response curve was performed by Gareth for all modules (except the KB's) in situ at low temperature on the evening of Friday 5 July, STRUN 3660. Some chiller problems were encountered towards the end of this exercise, so the modules may have been a bit warmer than they ran during the beam runs.
Further response curves were done on Wednesday 10 July when it was noticed that K308 and 0053 looked to have significant offsets. It was found that the rcdat files for both these modules were not good, and they were replaced with the new rcdat files for the second week. Other modules were not changed. K5_305 was in any case removed from thr testbeam for thermal studies.

Program

Comments or suggestions to the program are invited. We plan:

To perform a detailed bias scan at normal incidence of all modules, including the irradiated endcaps with improved front-end settings
To scan across the width of the modules covering all chips at nominal conditions (150/350V)
To perform a series of magnet and angle scans for the barrels, but including the endcaps
To continue the planned series of position scans along the length of the endcaps not completed in June
To take some high-statistics runs on the edge regions of the barrel detectors for the alignment community.

Evolving scan table:


Nominal conditions:   Vdet 150, Vdet* 350,  Vcc(305,308) = 3.8V, Vdd(305,308) = 4.2V, X=1cm, Angle=0

Scanpoint     Vdet/Vdet*(/Vendcap*)  X(cm)

Bias Scan - basic points   (NB:  K305, K308, 0053 need calibration corrections due to wrong/bad rcdat files)

A  6th 14:00  150/300     1     
B  6th 23:00  150/350     1     Vcc(305,308) = 3.5V    Reference scan
C  7th 09:00  150/350     1     Vcc(305,308) = 3.8V    Continue with Vcc=3.8V on irrad endcaps from here
D  7th 13:10  200/400     1
E  7th 19:40  250/450     1
F  8th 02:08  300/475     1

X Position scan
                     
G  8th 07:20  150/350     3
H  8th 13:00  300/475     3
I  8th 21:00  150/350     4.4
J  9th 02:00  300/475     4.4
                     /k5_305*
K  9th 16:00  150/350/350 0
L  9th 21:00  300/475/475 0

Bias Scan - extra points, new high bias scan on K308*

M 10th 03:00  150/350/450 1
N 10th 08:00   75/250/500 1

[MD - long access;  long pixel installatiom;  
 steering of beam and move of chamber:  X=1 becomes X=2 for modules in same position]
                     /k5_308* 
O 11th 22:00  150/350/350 2
P 12th 02:00  300/475/475 2
Q 12th 10:20  200/400/400 2
R 12th 17:20  250/450/450 2
S 13th 02:00  325/500/500 2
T part only   350/360/375 2  (attempt to run with same effective bias on all modules)
              100/300/300 2

Leave LV off, HV off, Brief access: switch off all chillers (1,2,3) for chambers to warm up

Next shift: when chambers warm:

Access to move barrel modules 0053,0034*,0007*,0056 to edge position (NOT 0026)
Rearrange k5_308* so that beam passes through the middle of the far detector

Barrel Edge Scan / Bias Scan on K308* far detector:  use new macro TBEdge(150,350,350)

U 13th 18:05  150/350/350
V 13th 22:00  300/475/475
W 14th 03:15  150/350/150 (unattended run overnight)
X 14th 10:30  300/475/450
Y 14th 16:45  300/475/500
Z 14th 21:00  300/475/400 
A1 14th 21:00  150/350/300 (End of edge scan)

End of Sunday night shift: LV off, HV off; take an access and switch chillers off.

Monday morning shift: rearrange all modules inside chamber for Angle Scan.  Move
table into centre of Magnet.

A2 15th 10:00  150/350/350 High Qth Res 1.0 -> 5.5
A3 15th 20:00  150/350/350 High Qth Res 1.0 -> 0.3
A4 16th 00:50  450/500/600 Extreme Bias Point
A5 16th 04:00  450/500/600 Edge ON/OFF 0.9fC

   ****** DO NOT RAMP MAGNET - TILES EQUIPMENT MUST BE MOVED FIRST *********

MAGNET RAMPED
k5_308* removed

B1 16th 05:00  150/350/-   +16deg Mag ON
B2 16th 22:15  150/350/-   +16deg Mag OFF

Participants

Please advise if you wish to be included as a participant, with an indication of the dates when you could sit shifts.


               M  Tu W  Th F  Sa Su M  Tu W  Th F  Sa Su M  Tu W  Th F
July           01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19

Prepare        ########
Install                 ##                                     ##
Run                       *************************************


Lars Eklund    |-----------|

Gareth               |------------------------------------------|(UCL DAQ workshop)
Gaby Bright    <------------------------------------------------------>
Sandor Kazi    <------------------------------------------------------>

Jose Enrique   <------------------------------------------------------>
 Garcia Novarro
Sergio         <------------------------------------------------------>

Alan Barr          |-------------------------------------|
Matt Palmer        |-------------------------|
Bruce Gallup       |-------------------------|

Rainer Wallny  <--------------|                     |----------------->
Ana
Monica D'Onofrio<-------------|      |-------------------------------->
Mariane       
Bettina
Mauro

Michael Solar           |------------------------|   (4-12)
Tomas Horazdovsky       |------------------------|   (4-12)