Design Update of the Solenoid Design Andrea Bersani INFN Sezione - - PowerPoint PPT Presentation

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Design Update of the Solenoid Design Andrea Bersani INFN Sezione di Genova Cryogenic Turret Design Cryogenic control box features several protrusions valves turbomolecular pumps controls etc . *current leads* They can be somehow arranged

SLIDE 1

Andrea Bersani

INFN Sezione di Genova

Design Update of the Solenoid Design

SLIDE 2

GSI, 9 March 2010

Cryogenic Turret Design

Cryogenic control box features several protrusions

valves turbomolecular pumps controls etc. current leads

They can be somehow arranged to reduce the interference with other subsystems The last required modification was a further 35cm increase in the cryogenic chimney height...

SLIDE 3

GSI, 9 March 2010

Keep-Away Volume

SLIDE 4

GSI, 9 March 2010

Present Design

Increased height Current leads on one side

more space available for the target simpler path to the power supply more complicated design of the cold part

f the current leads

Space for further adjustments is getting tighter and tighter

SLIDE 5

GSI, 9 March 2010

Considerations

The available space between the top of the chimney and the ceiling is getting tighter and tighter The presented keep away volume is optimised to allow the smoothest target operations

no protrusion is foreseen in downstream direction more space is needed on the sides and in upward direction

The power supply is foreseen on the moving platform

n the right w.r.t. the barrel, looking in downward

direction

expected weight: several hundred kg expected dimensions: two 19in, 40u racks

SLIDE 6

GSI, 9 March 2010

Reverse Polarity

A request for a polarity reversibility arose In principle there is no difference between the different polarities

small differences can arise due to hysteresis some additional training effect can arise

The field must be measured in the two polarities in different power cycles to evaluate the reproducibility of the magnetic field We evaluate that the polarity reversal will take ~90 minutes (30 min. power down + 30 min. power up + contingency)

SLIDE 7

GSI, 9 March 2010

Hardware for Reverse Polarity

No modification is needed on the coil, coil former and cryostat Proper quench detectors are needed A proper power supply (bipolar) is needed

several companies can deliver it (Bruker, Alpha Scientific…) it is more expensive than an unipolar one

Any different solution (adding switches, manually acting on wiring) is strongly discouraged

reliability issues, speed, safety...

SLIDE 8

GSI, 9 March 2010

Things We Can Do

An evaluation of the field difference in the two polarities is not easy We did calculations modifying the iron magnetisation curve to evaluate the uncertainty due to the iron quality We can do something similar to take into account the hysteresis

Design Update of the Solenoid Design Andrea Bersani INFN Sezione - - PowerPoint PPT Presentation

Andrea Bersani

INFN Sezione di Genova

Design Update of the Solenoid Design

Cryogenic Turret Design

Cryogenic control box features several protrusions

valves turbomolecular pumps controls etc. current leads

They can be somehow arranged to reduce the interference with other subsystems The last required modification was a further 35cm increase in the cryogenic chimney height...

Keep-Away Volume

Present Design

Increased height Current leads on one side

more space available for the target simpler path to the power supply more complicated design of the cold part

Space for further adjustments is getting tighter and tighter

Considerations

The available space between the top of the chimney and the ceiling is getting tighter and tighter The presented keep away volume is optimised to allow the smoothest target operations

no protrusion is foreseen in downstream direction more space is needed on the sides and in upward direction

The power supply is foreseen on the moving platform

direction

expected weight: several hundred kg expected dimensions: two 19in, 40u racks

Reverse Polarity

A request for a polarity reversibility arose In principle there is no difference between the different polarities

small differences can arise due to hysteresis some additional training effect can arise

The field must be measured in the two polarities in different power cycles to evaluate the reproducibility of the magnetic field We evaluate that the polarity reversal will take ~90 minutes (30 min. power down + 30 min. power up + contingency)

Hardware for Reverse Polarity

No modification is needed on the coil, coil former and cryostat Proper quench detectors are needed A proper power supply (bipolar) is needed

several companies can deliver it (Bruker, Alpha Scientific…) it is more expensive than an unipolar one

Any different solution (adding switches, manually acting on wiring) is strongly discouraged

reliability issues, speed, safety...

Things We Can Do

An evaluation of the field difference in the two polarities is not easy We did calculations modifying the iron magnetisation curve to evaluate the uncertainty due to the iron quality We can do something similar to take into account the hysteresis

this doesn’t give the answer to all questions we can get an estimation of the expected differences in the field map afer a polarity reversal

An alternative solution can be a “double power cycling” … to be studied

Andrea Bersani

INFN Sezione di Genova

Design Update of the Solenoid Design

Cryogenic Turret Design

Cryogenic control box features several protrusions

valves turbomolecular pumps controls etc. *current leads*

They can be somehow arranged to reduce the interference with other subsystems The last required modification was a further 35cm increase in the cryogenic chimney height...

Keep-Away Volume

Present Design

Increased height Current leads on one side

more space available for the target simpler path to the power supply more complicated design of the cold part

Space for further adjustments is getting tighter and tighter

Considerations

The available space between the top of the chimney and the ceiling is getting tighter and tighter The presented keep away volume is optimised to allow the smoothest target operations

no protrusion is foreseen in downstream direction more space is needed on the sides and in upward direction

The power supply is foreseen on the moving platform

direction

expected weight: several hundred kg expected dimensions: two 19in, 40u racks

Reverse Polarity

A request for a polarity reversibility arose *In principle* there is no difference between the different polarities

small differences can arise due to hysteresis some additional training effect can arise

The field must be measured in the two polarities in different power cycles to evaluate the reproducibility of the magnetic field We evaluate that the polarity reversal will take ~90 minutes (30 min. power down + 30 min. power up + contingency)

Hardware for Reverse Polarity

No modification is needed on the coil, coil former and cryostat Proper quench detectors are needed A proper power supply (bipolar) is needed

several companies can deliver it (Bruker, Alpha Scientific…) it is more expensive than an unipolar one

Any different solution (adding switches, manually acting on wiring) is strongly discouraged

reliability issues, speed, safety...

Things We Can Do

An evaluation of the field difference in the two polarities is not easy We did calculations modifying the iron magnetisation curve to evaluate the uncertainty due to the iron quality We can do something similar to take into account the hysteresis

this *doesn’t give* the answer to all questions we can get an estimation of the expected differences in the field map afer a polarity reversal

An alternative solution can be a “double power cycling” … to be studied

valves turbomolecular pumps controls etc. current leads

A request for a polarity reversibility arose In principle there is no difference between the different polarities

this doesn’t give the answer to all questions we can get an estimation of the expected differences in the field map afer a polarity reversal