Hall B Cryogenics

petnamelessUrban and Civil

Nov 15, 2013 (3 years and 7 months ago)

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Hall B Cryogenics

CLAS and CLAS12

David Kashy

Hall B Lead Engineer

May 26, 2010

CLAS


Cryogenic Components


Transfer line from ESR


6 coil torroidal field magnet with
s
ervice module

built by
Oxford Instruments operating since 1995


500 liter liquid helium dewar


standard product with 2
liquid withdrawal bayonets and cold gas return


Liquid helium cooled cryo
-
target
-

capable of liquefying
hydrogen, deuterium, He4 and He3


Frost Target and 5 Tesla Polarizing Magnet


5T Polarized Target


cooled with LHe


4.7T Solenoid


cooled with LHe


HDIce


In development also cooled with LHe

CLAS Cryogenic Hardware

CLAS OXFORD Torus

Frost Polarizing Solenoid

Cryofab 500
l

Buffer Dewar

4.7 T DVCS Solenoid

Photon Target Cell 40 x 4cm

Microwave Polarized Target

Electron Target Cell 2.5 x 1cm

30mK FROST Target

Scheduled Experiments 2010
-
2012


Frost:
Torus, Buffer Dewar, Frost Target and Polarizing Magnet


HDIce/HD DVCS:
Torus, Buffer Dewar and In
-
Beam
-
Cryostat


Primex:
No cryogenics, but keep Torus cold


Two Photon Exchange:
Torus, Buffer Dewar and Standard
Cryotarget


CLAS Loads


Torus: 110 Watts and 0.6 g/s lead cooling


Transfer Lines and Buffer Dewar: 30 Watts


Targets and Solenoids


All are of same order
of magnitude ≤ 1g/s (liquefaction loads)


LN2


7 g/s including TL



CLAS 12


Cryogenic Components


Transfer line from ESR


500 liter liquid helium dewar


standard product with 2
liquid withdrawal bayonets and cold gas return


Liquid helium cooled cryo
-
target
-

capable of liquefying
hydrogen, deuterium, He4 and He3


New 6 coil torroidal field magnet with service module


New 5 Tesla Solenoid Magnet


New Distribution Can for both magnets and connection of
Buffer Dewar


New Polarized Target


HDIce


In development also cooled with LHe


CLAS 12 New hardware

Torus


WANG NMR

Solenoid


WANG NMR

Distribution Box

CLAS12 Loads


Torus: 100 Watts and 0.6 g/s lead cooling (per
specification note: Vendor claims less)


Solenoid 70 Watts and 0.6 g/s lead cooling
(per specification note: Vendor claims less)


Transfer Lines, Distribution Box and Buffer
Dewar: 60 Watts


Targets


All are of same order of magnitude ≤
1g/s (liquefaction loads)


LN2


~10 g/s including TL



CLAS12 Load Summary


Refrigeration load



230W


Liquefaction load


2.2 g/s


LN2




10g/s


LHe Inventory



1150 liter


LN2 Inventory


200 liter



Start up date April 2013


Duration 10+ years

Questions?