1Satoshi Mihara ICEPP, Univ. of Tokyo Feb. 2004 MEG Review Meeting

Liquid Phase Purification

Satoshi Mihara

2Satoshi Mihara ICEPP, Univ. of Tokyo Feb. 2004 MEG Review Meeting

Liquid Phase Purification

• From our experience obtained in LP studies, we know that water contamination affects most the absorption of scintillation light.– Water can be removed by using molecular sieves.

• Improve circulation speed– Gas phase purification 5-6cc/minute (in liquid)

• Reduce heat load during purification– Gas phase purification needs liquefaction of purified

gas

3Satoshi Mihara ICEPP, Univ. of Tokyo Feb. 2004 MEG Review Meeting

Liquid phase purification test

• Pump and purifier in the Large Prototype chamber– Very simple

– No worry about heat load

4Satoshi Mihara ICEPP, Univ. of Tokyo Feb. 2004 MEG Review Meeting

Implementation in the final detector

• Xenon from the bottom bypass the wall to the pump/purifier

• Easy maintenance

• Possible heat load to the bottom

Next slide

5Satoshi Mihara ICEPP, Univ. of Tokyo Feb. 2004 MEG Review Meeting

Realization of the system

• Verification of liquid phase purification– Large Prototype is the

best to show the purification performance

• Long term operation in the final detector– Heat load to the bottom

must be minimized

6Satoshi Mihara ICEPP, Univ. of Tokyo Feb. 2004 MEG Review Meeting

Purification systemin the final detector

LXe CalorimeterLiquid circulating purifier

Liquid pump (100L/h)

Purifier1000L storage dewar

Cryocooler (100W)

LN2

LN2

Getter+Oxysorb

GXe pump (10-50L/min)

GXe storage tank

Cryocooler (150W)

Heat exchanger

Gas phase purification

Liquid Phase purification

7Satoshi Mihara ICEPP, Univ. of Tokyo Feb. 2004 MEG Review Meeting

Status• Fluid pump was delivered to a Japanese manufacturer.• The pump and purifier cartridge are being assembled for

verification test.• Verification test will be performed by using the LP.

motor

Outside of the cryostat

(room temp.)

Inside of the cryostat

(low temp.)

Impeller

Pump isolator