Agenda – Basics of cavity integration into CAST

• Introduction (M Davenport)

• Information exchange• 2016 – Vacuum in cold bore – 2 cavities• Cooling

• RF Cavities in cold bore• Vacuum, need good thermal contact (pressure or indium/copper braid …….)• Is 1.8K essential for 2016 run?

• Amplifier/circulator vessel• What is maxm temperature allowed?

• Size of cavities wrt cold bore• Be conservative in dimensions for 2016• Exact values can be used for 2017

• ‘Fixing’ cavities in cold bores• Thompson’s gun –effect at a quench?• Good thermal contact needs pressure contact?

• Instrumentation• Temperature probes etc

• Metrology• Precise internal diameter of cold bore

• Design study for integration

• 2017 – Helium possible in cold bores – up to 14 cavities ?• Cooling

• RF Cavities in cold bore – via helium• Amplifier/circulator

New vacuum tight flange with electrical feedthroughs to replace the gate valve

AMP + circulator

@ 1.8KCavities at 1.8K

New vacuum tight flange with electrical feedthroughs

This pipework would be removed

First Concept – means feedthrough between antenna and amplifier

New vacuum tight flange with electrical feedthroughs to replace the gate valve

Cavities at 1.8K

New Vessel at 2K with flange with electrical feedthroughs

amp

amp

Present concept : direct line between antenna and amplifier

Cryostat intervention MRB - old system helium-4

Flange welded

Cold window clamps

He line

Vacuum line

Cryostat intervention MRB - new system helium-3

cryovalve

70K shield

2K return pipe

70K clamp

New vacuum vessels for preamps and circulators off-centre to avoid obstacles

2016 run – be conservative in size of vessels. Take measurements in situ for 2017 versions

MM2

HV201HV204

MFB SIDESunrise

MM3

MM

CCD

Expansion Volume [450 l]

Storage Volume [1000 l]

3He T

ran

sfer syste

m

LN2RT

Trap Purge System

Vstore

PI101

PT203

PT202PI201 PV208 PV207

PV211

HV103

PV101

HV301

PV305

HV311

HV312

PV306

HV307

PV308

HV209PI206

PT102

PV102

PV106 PV105

PT104

HV104

PI103

V#10

HV210

HV302

CV111

HV309

HV303HV304

P313

P111

PV108

CV107PV112

PV109

PI105

PT106V-215

V#2

PV310

HV313 HV110

LN2

RT

Not on magnet

P212

Pu

mp

Oil p

urg

e

system

PV212

PT208

PT308

P

P

P P

P

PPT306

PPT307

PV314HV315

V-205

Telesc.

3He /4He calib. gas

Vac 1Admit air

MRB SIDESunset

V-209B

PNUNOP

BB

Drytel 2Primary

P1BA

P2BA

P3BAP3

P4BA

P4PCCD

PMM

VT1

VT2

P10

PP P

PP

P

P

P

(Gas 11)

(Gas 12)

(Gas 13)

V Slow

V Fast

Not

on

mag

net

LD

(Gas 1)

(Gas ?)

PT212 PT207

P VACL0-1000 lin

P7 (ion)P

P

P P7BA

Drytel 1

Vdt 1

P V12

P

SIP

Vac 5

Vac 7

Pir 2

Vac 3

Vac 2

Vac 4

LEP MFB

Not o

n mag

net

Residual Gas

Vac 6

Ion_P

Pir 1

P6BA R

P6BAP

PP

P

filter

turbo

turbo

P

Jaime pump

PPTPC

Leak detection /gas

analyser

VLD

Vac 13

P

P9

Vac 11Vac 12

Vac 14P8BA

Vac 15

turbo

PrimaryP7 pump

P

Vssmm

PV107

P-57

PPT

204

NV

202

CV

203

PT

205

PV

205

PCV

206

1.8 K

~293 K

~70 K (thermal shieldi ng)

VT3

VT4

Oil return

Thin x-ray cold windows

Thin x-ray cold windows

2bar

LEP MFB

P

P PT304

P PT302

PI301

2K

Old Helium-3 gas /vacuum system

Connected thermally but no gas /vacuum connection

70K thermal shield 70K thermal clamp

2K

~40K

70K

300K

Vac pumpsVac pumps2015 system

2K

Old Helium-3 gas /vacuum system

Connected thermally but no gas /vacuum connection blank flange

70K thermal shield 70K thermal clamp

2K

2K ??

70K

300K

Vac pumpsVac pumps2016 system ?

2K

Old Helium-3 gas /vacuum system

Connected thermally but no gas /vacuum connection blank flange

70K thermal shield 70K thermal clamp

2K

2K ??

70K

300K

Vac pumpsVac pumps2017 system ?

?

blank flange