East Area Secondary Beam Control User Guide

L.Gatignon / AB-ATB

12 June 2008

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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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COLLIMATORSFor users:

For experts: VACUUM CONTROLDRIFT CHAMBERS

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TIMING AND OTHER SIGNALS

Communicationwith user barracks

Communicationwith APRON (primarybeam electronics andRP barrack)

Timing distribution

Two more racks provide timing signals and connections with the user barracks

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Magnet and detector control

• Magnets are controlled via “working sets” and “knobs”

• Detectors (scintillators and delay wire chambers) are controlled via the “applauncher” program

Folder with referencesettings and general info

Beam control PC (user: eaop passwd: . . . . . . . . )

Magnets and detectors are controlledand read from the Linux PC in the EBCR

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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”

• All the magnets of a beam line are grouped in “Working sets”

Java X-windows

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Magnets: Working sets

• The working sets allow to open knobs and to issue commands on several knobs at a time

• Select by clicking orby Edit – Select all

• Then Control – Open Knobsor Control – Pow – Standby, Reset, ON or OFF

From the Java console manager you can open the working set via the working set launcher:e.g. WorkingSets – T9. If asked, select EASTA

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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

• 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.

F61N for North target, ZT7 for South target

MSC = SEM counter, nom. rate ~20 (x1010)

MTEL = 90o telescopenom. rate ~few 103

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Detectors: The application Launcher

• 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

• 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).

Name of your beam Count rate per PS East cycle

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Detectors: Delay Wire Chamber profiles

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 testdata is shown on the left hand side(i.e. no beam).

The scale is in millimeters

For profiles

T7: 2000 2001T9: 2010 2011T10: 2020 2021T11: 2030 2031

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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 p/p with typically p/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

x y

ThumbwheelsLCD screens

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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

• 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.

Paper documentation

Select the wanted cyclesDelay (in msec) fromstart of PS cycle

Signal during full PS cycles selected

Pulse at start ofextraction ( delay)

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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 theGeneral menu in theJava Console Manager:

The green dots indicate theIntensity per spill for the differentTarget telescopes

The white curve showsThe shape of the spill overIts 400 msec length

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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 fromthe 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)