CERN/SL - EA Group - Secondary Beamlines

CERN SPS-LEP (SL) Division

 Experimental Areas Group

Secondary Beamlines
Very schematic view of an accelerated particle
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Beamlines

Main Index

Revised for 1998 situation

Updated 11 November 1997

comments and suggestions please to LG (contents), MT or MyB (layout), or Email to Webmasters at SL
(last update 28 March 1995)

Beamlines - West Area

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Beam

 Max.Momentum
(GeV/c)

 Intensity for 1012 incident
protons at 450 GeV/c

 Beam type
H3

 250

 ~ 2 107 secondaries

 Parent beam for X5,X7
X5

 250

 102-104 tertiaries/107 incident particles
< 106 secondaries

 Test beam
e, pi, mu
X7

 250

 102-104 tertiaries/107 incident particles
< 106 secondaries

 Test beam
e, pi, mu

Beamlines - North Area

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Beam

 Max.Momentum
(GeV/c)

 Intensity for 1012 incident
protons at 450 GeV/c

 Beam type
H2

 400

 9 107 pi+ at 200 GeV/c
3 107 pi- at 200 GeV/c
4 106 e± at 150 GeV/c
1 105 Pb at 400 GeV/Z

 1) High-energy hadron or electron beam (also test beam)



2) Heavy ion beam
H4

 450

 pi, e fluxes similar to H2
~ 107 protons at 450 GeV/c
~ 107 Pb

1) High-energy hadron or electron beam
2) Attenuated primary beam
3) Heavy ion beam
H6

 205

 108 pi+ at 150 GeV/c
4 107 pi- at 150 GeV/c

 Medium energy hadron beam, also used to produce tertiary test beams
H8 450 ~ 107 protons at 450 GeV/c
2 108 pi+ at 200 GeV/c
7 107 pi- at 200 GeV/c
~ 106 Pb at 400 GeV/Z

 1) Attenuated primary or high-energy hadron (e±) beam
or electron beam

2) Heavy ion beam
M2

 225

 2 107 mu+ at 100 GeV/c
3 106 mu- at 200 GeV/c

 High-intensity (polarised) muon beam
P41/P61

 450

 < 1011 protons at 450 GeV/c
> 5 107 Pb at 400 GeV/Z

 Primary beam to transport protons or ions from T4 or T6 to ECN3 (NAHIF)
K12

 450

 107 KL > 50 GeV/c
3 102 KS > 50 GeV/c

 Simultaneous KS and KL beams to ECN3

WEST AREA

A general description of the West Area is available here.

The H3 Beam

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This beam will from 1997 onward only serve as parent beam for the X5 and X7 test beams.

The following version of the optics exists:

Parent beam for X5 beam : From T1 to X5 (Postscript) (PDF)
Parent beam for X7 beam : From T1 to X7 (Postscript) (PDF)

Tuning procedure
Particle composition according to H.W.Atherton et al.
Reference sheet
Logfile from control system
Typical operation modes of the H3 beam

During the 1999/2000 shutdown, the H3 beam is being modified to accomodate for the displacement of the T1 target - see here. Please find below the optics drawings of the H3 beam in its 2000 version:

Parent beam for X5 beam (version 2000): From T1 to X5 (Postscript)
Parent beam for X7 beam (version 2000): From T1 to X7 (Postscript)
The new schematic layout and new numbering scheme for beam elements is shown in this figure.

Liaison physicists: Per Grafström and Lau Gatignon

The X5 Beam

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This is a highly versatile secondary or tertiary test beam with energies up to 250 GeV/c. The user is completely free to choose either electron, pion or muon beams of energies in the range specified above.
At the end of the beam line it is expected to provide a photon irradiation facility that allows to test detectors with a weak muon flux originating from the X5 beam in the presence of a strong gamma flux from a radioactive source. Please click here for more details about the muon flux in the irradiation facility. The principle of muon beams in the X5B and GIF zones is explained in this schematic figure. A preprint (submitted for publication in NIM) is available.

The following versions of the optics exist:

Test beam optics: Optics drawing in color or black and white (Postscript) (PDF)
Experiments along this Beam:
None
Test facilities along this Beam:
X5A - Zone PPE 105
X5B - Zone PPE 115
Radiation Facility - Zone 125

User Guide
Logfile from control system

You may be interested to make a commented and illustrated tour along the X5 beam!

Liaison physicist: Lau Gatignon

The X7/X9 Beam

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This is a highly versatile secondary or tertiary test beam with energies up to 250 GeV/c. The user is completely free to choose either electron, pion or muon beams of energies in the range specified above. The X9 version of the beam denotes a dedicated test beam facility for the WA95/CHORUS experiment.
Please note that from 1998 onward there will be no more restrictions from CHORUS on the operating conditions of the X7 beam.

The following versions of the optics exist:

X7 test beam optics: Optics drawing in color or black and white (Postscript) (PDF)
X9 beam optics: Optics drawing (Postscript) (PDF)
Experiments along this Beam:
None
Test facilities along this Beam:
X7A - Zone PPE 077
X7B - Zone PPE 097
WA95/CHORUS - tests no controlled area

User Guide for the X7 beam
User Guide for the X9 beam
Logfile from control system

Muons accompanying the X7 beam may traverse NOMAD, depending on running conditions. Some explanations are given here.

You may be interested to make a commented and illustrated tour along the X7 beam!

Liaison physicist: Lau Gatignon

NORTH AREA

The H2 Beam

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This is a high-energy general purpose beam, suitable both for tests and experiments.

The following versions of the optics exist:

Parallel optics for NA43: Optics drawing (Postscript)
Heavy ion optics:
Test beam optics (mixed mode): Optics drawing (Postscript)
Experiments along this Beam:
NA43 - Zone PPE 142
NA49 - Zone PPE152
Test facilities along this Beam:
H2A - Zone PPE 172

User Guide for the H2A zone.
Logfile from control system

Liaison physicist: Niels Doble

The H4 Beam

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This is a high-energy general purpose beam, suitable both for tests and experiments.

The following versions of the optics exist:

High-resolution optics:
High-acceptance optics:
Heavy ion optics: Optics drawing (Postscript)
Test beam optics (mixed mode): Optics drawing (Postscript)
Experiments along this Beam:
NA44 - Zone PPE 134
NA57 - Zone PPE 134
Test facilities along this Beam:
H4A - Zone PPE 154
H4B - Zone PPE 164

User Guide for the H4A zone.
Logfile from control system
Various infos related to the H4 and the T2 wobbling

Liaison physicist: Per Grafström

The H6 Beam

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This is a secondary or tertiary test beam with energies in the range between 5 and 205 GeV/c. However, the secondary beam momentum is coupled to the H8 and P41/P42 beam momenta. The beam is also used by the NA52 experiment as a high-resolution spectrometer for searches of particles produced in collisions of high energy lead ions with heavy target atoms.

The following versions of the optics exist:

High transmission optics: Optics drawing (Postscript)    (PDF)
Test beam optics (mixed mode): Optics drawing A3-colour PS (PDF) or A4-monochrome PS (PDF).
Experiments along this Beam:
NA52 - Zone 156. Uses the full H6 beam as a spectrometer.
Test facilities along this Beam:
TIS/RP - Zone PPE 126
H6A - Zone PPE 146
H6B - Zone PPE 156
H6C - Zone PPE 166

User Guide
Logfile from control system

Liaison physicist: Konrad Elsener

The H8 Beam

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This is a high-energy general purpose beam, suitable both for tests and experiments. In microbeam mode it can provide a very small spot attenuated primary proton beam.

The following versions of the optics exist:

High-resolution optics:
High-acceptance optics:
Test beam optics (mixed mode): A3 colour PS (PDF) or A4 monochrome PS (PDF)
Microbeam optics: Optics drawing (Postscript)
Heavy ion optics: Optics drawing (Postscript)
Experiments along this Beam:
NA45 - Zone PPE 138
Test facilities along this Beam:
H8A - Zone PPE 158
H8B - Zone PPE 168

User Guide
Logfile from control system

Liaison physicist: Konrad Elsener

The M2 Beam

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This is the CERN high-intensity muon beam. It consists of an approximately 600 metres long pion and kaon decay channel, at ther end of which the remaining hadrons are observed in up to 9.9 metres of Beryllium. The remaining muon beam is shaped and cleaned in the 400 metres long muon section of the beam.

Schematic view of the M2 muon beam < click for full picture

The following versions of the optics exist:

Muon beam: Hadron section optics: Optics drawing (Postscript) (PDF)
Muon beam: Muon section optics: Optics drawing (Postscript) (PDF)
Hadron beam: Full beam optics: Optics drawing (Postscript) (PDF)
Hadron beam: -225 GeV/c optics (compatible with protons in P61): Optics drawing (Postscript) (PDF)
Electron beam: Secondary beam optics (T6 to secondary target): Optics drawing (Postscript) (PDF)
Electron beam: Tertiary beam optics (Secondary target to COMPASS): Optics drawing (Postscript) (PDF)
Experiments along this Beam:
NA58 (COMPASS) - Zones PPE211, PPE221

This beam has recently been upgraded for the COMPASS experiment, The new design is described here
The commissioning of the M2 beam in 1999 is summarised here.

User Guide
Quick Reference
Draft tuning procedure
Logfile from control system

Liaison physicist: Lau Gatignon

The P41/P61 Beam

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These beams are high-intensity proton transport beams from the primary targets T4 (P41) or T6 (P61) to the experimens at the Jura side of ECN3. The branch P61 can also serve as a heavy ion beam. If necessary, secondary beams can be created from a secondary target located some 200 metres upstream of the end of ECN3. Depending on requirements in the H8 and H6 beams, pure and high-resolution electron beams can be provided by conversion of photons produced in T4. The P41/P61 beams are part of the P0 complex.

The following versions of the optics exist:

Attenuated proton optics from T4: Optics drawing (Postscript) (PDF)
Attenuated proton optics from T6: Optics drawing (Postscript) (PDF)
Heavy ion optics: Optics Optics drawing (Postscript) (PDF)
Electrons from conversion of photons from T4: Optics drawing (Postscript) (PDF)
Experiments along this Beam:
NA50 - Zone ECN3

Short User guides exist for the P41, P61 and H10 beams. A special User Guide for P0 Ion beams, as well as a User Guide for P0 Proton beams to NA50 and NA60 are available as well.
P41+H10 Logfile from control system
P61+H10 Logfile from control system

Liaison physicist: Lau Gatignon

The P42+K12 Beams

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Schematic view of the simultaneous KL and KS beams The P42 beam is a transport system for primary proton beams from P4 to the T10 target.
The K12 beam consists of simultaneous KL and KS beams coinciding at the NA48 experiment at the Salève side of ECN3. The KL beam is a secondary beam produced at T10. A small fraction of the protons that traverse T10 without interaction are recuperated by a bent Silicon crystal and transported to a KS target, located some 120 metres downstream of T10. The KS target is 72 mm above the KL beam axis and from there the KS beam is produced and steered to converge with the KL beam with an angle of 0.6 milliradians. A schematic view of the K12 beam layout is available.
A collection of figures is available here. A detailed description of the beam is available on the Web in PDF and compressed Postscript format. A shortened version is available as well.
Under certain conditions an electron calibration beam can be made available for the detectors in ECN3 by conversion of photons originating from T4. The P42+K12 beams are part of the P0 complex.

The following versions of the optics exist:

P42 proton optics: Optics drawing (Postscript) (PDF)
K12 proton optics between T10 and KS target: Optics drawing (Postscript) (PDF)
Electrons from conversion of photons from T4: Optics drawing (Postscript) (PDF)
The underlying schematic K12 optics diagram allows you to click on most of the beam elements to get some more information about them!
The evolution of the emittance of the proton beams impinging on the KL and KS targets over the years is described in a separate Webpage.

Experiments along this Beam:

NA48 - Zone ECN3

User Guide
Tuning Procedure P42+K12 (PS) (PDF) (1998 version)
P42 Logfile from control system
K12 Logfile from control system

The geometry data for the layout of beam and experiment can be found here .

Liaison physicist: Niels Doble

Last update: 11 September 2000 - LG