Dipole magnet for cbm current status
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Dipole magnet for CBM: current status. P.G. Akishin, A.V. Alfeev, V.S. Alfeev, V.V. Borisov, V.V. Ivanov, E.I. Litvinenko, A.I. Malakhov, E.A.Matyushevskiy JINR, Dubna. The main task is to provide the design of a magnet with:

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Dipole magnet for CBM: current status

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Dipole magnet for cbm current status

Dipole magnet for CBM: current status

P.G. Akishin, A.V. Alfeev, V.S. Alfeev, V.V. Borisov, V.V. Ivanov, E.I. Litvinenko, A.I. Malakhov, E.A.Matyushevskiy JINR, Dubna

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 1


The task definition

The main task is to provide the design of a magnet with:

the working angular acceptance at least of 50° for the height of a gap (1.2 m) and 60° for the width of a gap (1.4 m), and, for the mounting inside the gap MVD/STS detectors, the sizes of its rectangular part should be at least 1.2 x 1.2 m ;

the magnetic yoke size along the beam is equal to 1 m;

the integral of the magnetic field in the region of the yoke of the magnet along the beam from 1 to 1.2 T*m;

the magnetic field distribution, which is similar to the map “FieldMuonMagnet”, that is the current standard for the magnetic field for CBM simulations.

The task definition

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 2


Dipole magnet for cbm current status

Technical drawing

1. Beam; 2. Rack; 3. Coil; 4. Adapter; 5. Filler; 6. Support of a magnet; 7. Magnetic screens.

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 3


The conceptual project of a magnet

The conceptual project of a magnet

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 4


Dipole magnet for cbm current status

Yoke of the magnet

1.2m

2.6

1.4 m

1m

0.33m

2.8 m

  • Yoke material: magnetically soft steel with the low content of carbon

  • Yoke sizes: 280 (310) x 260 x 100 [cm]

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 5


Windings the cossack saddle

Windings («the Cossack saddle»)

The top part of a winding with cryostat

Nitric screen

Coil

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 6


Cryostat

Cryostat

Top & bottom cryostats with connectors (back view)

0.328 m

1.216 m

Top part of cryostat (front view)

  • two adapters:

  • current connection;- elements of monitoring systems;

  • transportation of helium and nitric.

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 7


Sc winding cross section

SC winding cross-section

Vacuum casing

Helium vessel

Nitric screen

SC cable

Helium pipe

Hatches

Cover of a vacuum casing

143.8 mm

4.5˚K

Support of the nitric screen

< 80˚K

300˚K

Pipe of the nitric screen(circulating liquidnitrogen)

328 mm

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 8


General view of the magnet

General view of the magnet

  • Filler facility:

  • evacuation of energy;- inputs for submission of liquid helium and liquid nitrogen.

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 9


Magnet geometry implementation for tosca

Magnet geometry implementation for TOSCA

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 10


Comparison with muonmagnet

Comparison with “MuonMagnet”

Used in CBM: “MuonMagnet”

New design: “Muon4”

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 11


Dipole magnet for cbm current status

|By| (z) x=y=0 (target: z=0 cm)

Blue – FieldMuonMagnet

Red- FieldMuon4

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 12


Dipole magnet for cbm current status

|B| (z,y) x=0 (target: z=0 cm)

Vertical plane along the beam:

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 13


Dipole magnet for cbm current status

|By| (z,y) x=0 (target: z=0 cm)

Vertical plane along the beam:

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 14


Dipole magnet for cbm current status

|B| (x,y) z=0 (target position)

Vertical plane perpendicular to the beam:

z=0

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 15


Dipole magnet for cbm current status

|By| (x,y) z=0 (target position)

Vertical plane perpendicular to the beam:

z=0

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 16


Dipole magnet for cbm current status

|B| (x,y) z=50 cm (magnet yoke center)

z=50

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 17


Dipole magnet for cbm current status

|By| (x,y) z=50 cm (magnet yoke center)

z=50

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 18


Dipole magnet for cbm current status

|By| (x,y) z=50 cm (in the limits of Station 4)

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 19


Dipole magnet for cbm current status

|B| (x,y) z=100 cm (edge of the magnet yoke)

z=100

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 20


Dipole magnet for cbm current status

|By| (x,y) z=100 cm (edge of the magnet yoke)

z=100

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 21


Dipole magnet for cbm current status

|B| (x,y) z=160 cm (RICH entrance)

z=160

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 22


Dipole magnet for cbm current status

|Bxy| (x,y) z=160 cm (RICH entrance)

|Bxy| = sqrt (Bx2+By2)

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 23


Let us consider standard and compact rich cases

Let us consider Standard and Compact RICH cases:

Data obtained from materials published on the site CbmRichMeeting Twiki

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 24


Dipole magnet for cbm current status

|B| (x,y) z=180 cm(photodetector plane for Compact RICH)

z=180

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 25


Dipole magnet for cbm current status

|B| z=180 cm(photodetector areas for Compact RICH)

0.042 (0.04->0.036)

0.058

0.047 (->0.04)

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 26


Dipole magnet for cbm current status

|Bxy| z=180 cm(photodetector plane for Compact RICH)

|Bxy| = sqrt (Bx2+By2)

z=180

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 27


Dipole magnet for cbm current status

|Bxy| z=180 cm(photodetector areas for Compact RICH)

0.028 (->0.015)

0.0494

0.047 (->0.03)

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 28


Dipole magnet for cbm current status

|B| z=190 cm(photodetector plane for Standard RICH)

z=190

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 29


Dipole magnet for cbm current status

|B| z=190 cm(photodetector areas for Standard RICH)

0.034(->0.029)

0.068 (->0.03)

0.034 (->0.03)

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 30


Dipole magnet for cbm current status

|Bxy| z=190 cm(photodetector plane for Standard RICH)

0.038 (->0.03)

0.023 (->0.02)

0.033

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 31


Geometry implementation for geant cbmroot

Geometry implementation for Geant (cbmroot)

Yoke

+Coils

+Nitric Screen

+Cryostat

+Magnetic Screens & Basement

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 32


Compatibility with sts geometry

Compatibility with STS geometry

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 33


Conclusion and outlook

I) The suggested engineering design of the superconductive dipole magnet for CBM provides the following characteristics:

angular acceptance is 50° for the height of the gap (1.2 m) and 60° for the longest part of the width of the gap (1.4 m), and the sizes of the rectangular part of the gap 121.6 x 120 cm should be suitable for the mounting of MVD/STS detectors;

the magnetic yoke size along the beam is equal to 1 m;

the integral of the magnetic field in the region of the yoke of the magnet along the beam is equal to 1.07 T*m when the current through the coils is set to a value 0.781 MA (in the case of “MuonMagnet” the current equal to 1.447 MA corresponds to the integral equal to 1.01 T*m);

the distribution of By component of the magnetic field along the beam axis is very close to the map “FieldMuonMagnet”;

the mean values of the the new magnetic field in the regions, in which the RICH photodetectors are to be placed, are about 300 Gsfor the last calculated field map.

II) The 3D model of the magnet was developed for TOSCA. The magnetic field map was calculated and converted for cbmroot. A new C++ class was developed to support the changes in the symmetry of the field.

III) The Geant geometry of the magnet was created for cbmroot and tested together with the latest available STS geometry.

IV) The final decision about the sizes, shape and positions of the magnetic screens and the basement (and material of the basement) will be made after further studies directed to the magnet optimization.

Conclusion and outlook

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 34


Backup slides

Backup slides

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 35


Dipole magnet for cbm current status

|B| (x,y) z=154 cm (end of the magnetic screens)

z=154

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 36


Dipole magnet for cbm current status

|By| (x,y) z=154 cm (end of the magnetic screens)

z=154

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 37


Dipole magnet for cbm current status

|Bxy| (x,y) z=154 cm (end of the magnetic screens)

|Bxy| = sqrt (Bx2+By2)

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 38


B and by z y in linear scale

|B| and |By| (z,y) in linear scale

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 39


No magnetic screen vs screen cases

“No magnetic screen” vs “Screen” cases

Elena.Litvinenko CBM Collaboration Meeting Dubna 17 Oct 2008 40


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