East Area Secondary Beam Control
User Guide
L.Gatignon / AB-ATB
12 June 2008
From where
• The East Area secondary
beam lines are controlled
from the EBCR. This
room is located on the
first floor, above the T10
control room,
downstream of the T11
area.
You can access this room
easily from the big gate
(Porte 18) on the Bldg
251/252 side.
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Tools for Beam Control
• There is a PC for magnet
control (both beam and
spectrometer magnets)
and detector readout
• A series of racks allows
to control collimators,
vacuum, access signals
from the barracks and get
timing signals
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For experts:
For users:
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DRIFT CHAMBERS
VACUUM CONTROL
COLLIMATORS
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TIMING AND OTHER SIGNALS
Two more racks provide timing signals and connections with the user barracks
Communication
with APRON (primary
beam electronics and
RP barrack)
Communication
with user barracks
Timing distribution
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Magnet and detector control
Beam control PC (user:
eaop
passwd: . . . . . . . . )
Magnets and detectors are controlled
and read from the Linux PC in the EBCR
• Magnets are controlled via
“working sets” and “knobs”
• Detectors (scintillators and
delay wire chambers) are
controlled via the
“applauncher” program
Folder with reference
settings and general info
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Magnets: Before you start
• Use the Console manager to start working. Two
versions exist: the Java one and the X-windows version.
The X-windows one is becoming obsolete and will
disappear in due course.
Select by clicking in the desktop.
Java:
X-windows:
• In the X-windows version,
you must first define a user via
“Set PLS” from the “Context”
menu.
Select EASTA (3) as User
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Magnet currents
• Each magnet is
controlled by a
“knob”
Java
X-windows
• All the magnets of a
beam line are
grouped in “Working
sets”
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Magnets: Working sets
From the Java console manager you can open
the working set via the working set launcher:
e.g. WorkingSets – T9. If asked, select EASTA
• The working sets allow to open
knobs and to issue commands
on several knobs at a time
• Select by clicking or
by Edit – Select all
• Then Control – Open Knobs
or Control – Pow – Standby,
Reset, ON or OFF
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Magnets: Knobs
•
•
•
•
Via the Control menu you can switch a rectifier On , Off, Reset or go to
Standby.
Normally it is not needed to switch OFF a rectifier, Standby is sufficient.
Changes of polarity are made while in Standby. Changes of current in the
same polarity do not require standby.
Change the current using the little arrows or by typing the current for the
active rectifier (the one with the red rectangle – ZT9.QDE5 in the example)
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Magnets: Which current?
Lists of currents for each energy are available in the green folder.
Whenever you change energy, all currents must be modified using the knobs.
Normally the sign of the current corresponds to the sign of the beam particles
(except possibly for ZT9.QFO03 – ask your liaison physicist)
Please check carefully that you are changing the right rectifier in the right beam!
(In each knob the name of the magnet contains the name of its beam line, e.g. ZT9.BHZ1)
Do not use the currents in the old printed User manuals. They are obsolete.
Please consult the liaison physicist if you have special beam requirements,
e.g. different focusing of the beam.
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Detector readings
MSC = SEM counter,
• The intensity and steering of
the primary beam on the
production target can be
checked via the
MEASUREMENT working set
• The scintillators and delay wire
chambers in the experimental
areas can be read via the
“applauncher” application.
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nom. rate ~20 (x1010)
MTEL = 90o telescope
nom. rate ~few 103
F61N for
North target,
ZT7 for
South target
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Detectors: The application Launcher
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•
Open a Local Xterm (by clicking
on the Desktop) and type
applauncher. A window like on the
left hand side appears.
•
Launch BXSCINTSE for the
scintillator reading and
BXDWCGUIE for the Delay Wire
Chamber readout. Both are in the
EAE domain.
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Detectors: Scintillator readings
Name of your beam
Count rate per PS East cycle
• The GUI shows the Counts of all four scintillators.
• There is on in each beam line, called e.g. T9_SCINT
• The counts are updated for every EAST cycle. The ones on T9, T10,
T11 will only see beam for EASTA cycles, the one on T7 only for
EASTC cycles and provided that the beam is operated in secondary
mode (rather than for IRRAD).
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Detectors: Delay Wire Chamber profiles
For profiles
T7: 2000
T9: 2010
T10: 2020
T11: 2030
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2001
2011
2021
2031
 The GUI for Delay Wire Chamber
profiles is still under development.
 One chamber per beam (X and Y
planes)
 E.g. Device 2020 refers to the
horizontal (X) profile, 2021 to the
vertical (Y) profile of T10.
 A preliminary screen shot with test
data is shown on the left hand side
(i.e. no beam).
 The scale is in millimeters
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Example (for defocused beam in T9):
Change device (chamber/plane)
via File → Change device
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Collimator control
•
Find the crate controlling the
collimators in your beam line
•
If you want to open to (-x, +y) mm, dial
50+x/2 and 50+y/2 with the
thumbwheels
•
Push on the red STROBE buttons
•
The final position in mm is shown on
the LCD screens. Push STROBE
again if the setting reached is not
precise enough.
•
The horizontal collimators usually
define Dp/p with typically Dp/p=±1%
for ±5 mm gap (see User manual).
The vertical collimators control the
angular acceptance and hence the
beam flux and the divergence at your
detector. Check in the green folder
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LCD screens
x
Thumbwheels
y
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Vacuum control
• The vacuum control is
regularly checked by
experts from the AT/VAC
group.
• However, the user can
check the vacuum in his
beam line in case of
problems.
• Typical values are in the
few 10-2 mbar ballpark
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TIMING SIGNALS
Pulse at start of
extraction ( delay)
Delay (in msec) from
start of PS cycle
Signal during full PS
cycles selected
Select the wanted cycles
Paper documentation
•
The detailed documentation is available in the paper document inside the
module
•
The North branch (T9, T10, T11) uses EASTA cycles, the T7 line and
IRRAD the EASTC cycles. DIRAC uses EASTB.
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Communication with barracks
• There are several cable
connections between the
user barracks and the
EBCR. The name of the
barrack is written on the
blue panels above each
patch panel.
• Please check the labels
for the correspondence
between the barrack and
EBCR connectors
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Information from the PS machine
Activate EA Vistar from the
General menu in the
Java Console Manager:
The white curve shows
The shape of the spill over
Its 400 msec length
The green dots indicate the
Intensity per spill for the different
Target telescopes
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The Vistar on the TV screen shows the overall state of the PS (+ cycles):
Magnet current
Inst. Intensity
Active cycle
Cycle intensity
Comments from
the operators
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Further Information
• There is a web page:
http://cern.ch/gatignon/EastArea
• The access system operation is described in
http://cern.ch/gatignon/EastArea/Access.html
• Call the CCC (76677) for operational problems
(24 hrs/day, 7 days/week)
• Call your liaison physicist (L.Gatignon, 163554) for other
questions and requests (during working hours)
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