R. van Weelderen, LIUWG, 11.12.2008 1

IT upgrade phase I: Status of cryogenic scheme evolution (in work)

Outline

- Old & new layout- Design constraints- Cryogenic scheme- QRL interface, cryogenic distribution & superconductor

junction box: pipe sizing and valve adaptations

R. van Weelderen, LIUWG, 11.12.2008 2

Old & New, with cold D1, inner triplet layout in IP1 & IP5

R. van Weelderen, LIUWG, 11.12.2008 3

Cryogenic system: design constraints (1/2)

The cooling of the magnets for the Phase-I Upgrade and the associated cold power transfer system will be realized within the boundaries of the existing cryogenic infrastructure: the types and maximum available quantities of cryogens may not exceed the presently available supply provided in IR1 and IR5 by the cryogenic distribution line (QRL) and the respective refrigeration systems.

Design pressures of the new equipment are also subject to the present LHC specification.

----------------------------------------------------------------------------------------------------------The present QRL service modules contain most of the functionalities

necessary for the Phase-I Upgrade but possible re-use is limited by:

1) Increasing the piping dimension is prohibitive,2) The existing valves can be adapted to new requirements by changing their

poppets (within reasonable limits).3) Functionalities exceeding the possibilities of the existing service module

would need to be provided by a local cryogenic distribution box. 4) The QRL service module itself should preferably be moved to a new location

in between the correctors and D1. Keeping it at its present location would require a dedicated cryogenic extension line with many pipes and high diameters to limit pressure drops. The construction of entirely new service modules should also be considered.

R. van Weelderen, LIUWG, 11.12.2008 4

Cryogenic system: design constraints (2/2)

Basic flow scheme provides:

- D1 cooled by pool boiling

- D1 with warm bore (no actively cooled beam screen)

- CP + IT cooled by HeII using an internal bayonet HX of ID 95 mm

- CP + IT with cold bore and actively cooled beam screen

- Cold powering via a link and remote DFX

EFBDC

CP Q3 Q2b Q2a Q3

CV910

D1

CV947

beam screen

CV915newnewCV950

EH847

TT847

CV920 QV920

QV923

new L&V new L&V

WRL

EH

CY1CY2

EELD1

LD2XB

CC’

CC’3

CSDHFF

HeII pressurized (1.9 K)

HeI saturated (4.5 K)

HeI supercritical (4.5 – XX K)

HeII saturated (1.9 K)

LH LH

HeI supercritical (4.5 – 20 K)

CV930

R. van Weelderen, LIUWG, 11.12.2008 6

Cryogenic scheme: QRL interfaces (1/3)

Pipe Description (old) Description (new) Interface ID Cryostat ID QRL service module valve

D&F box valve

CY1 (CY1) 1.9 K, liquid supply 1.9 K, liquid supply 10 10 CV910 -

CY1 (CY!) bypass 1.9 K liquid supply bypass

1.9 K liquid supply bypass

- - CV915 -

EE (F1) 70 K screen supply D1, IT, CP, D&F box 70 K screen

supply

15 15 - -

LD1 Safety IT Safety IT + CP 50 40 SV920 -

LD1 bypass Cool down & fill supply

Cool down & fill supply

- - CV920 -

LD2 Cool-down & fill return, safety IT

Cool-down & fill return, safety IT +

CP

50 40 SV923 -

XB 1.9 K, gaseous return

1.9 K, gaseous return

70 70+ 95 100 - -

R. van Weelderen, LIUWG, 11.12.2008 7

Cryogenic scheme: QRL interfaces (2/3)Pipe Description (old) Description (new) Interface ID Cryostat ID QRL service

module valveD&F box valve

CC’ (CC’2) 4.6 K, TAS and beamscreen supply

4.6 K, beamscreen supply

10 10 - -

CS (CC’1) 4.6 K, lead box supply

4.6 K sub-cooler 10 10 CV930

DH 20 K, lead supply, lead-box return

D1, D&F box return

20 -> 30 for safety 20 -> 30 for safety PV930 -> - (to be suppressed)

PV930 on D&F box return only (D1 parallel return open)

FF (E2) 80 K screen return D1, IT, CM, D&F box 80 K screen

return

15 15 CV950 -

KD (CC’3) 20 K, beamscreen return

20 K, beamscreen return

10 10 CV947 -

TD 20 K, TAS return unused 10 10 CV941 -

R. van Weelderen, LIUWG, 11.12.2008 8

Cryogenic scheme: QRL interfaces (3/3)

Pipe Description (old) Description (new) Interface ID Cryostat ID QRL service module valve

D&F box valve

CD1 - D1 level control(NEW)

15 15 CVnew -

CD1’ - D1 cool-down, fill & warm-up

(NEW)

20 20 CVnew

- XB line needs size increase: 70 95 or 100 (pressure drop)

- DH line needs size increase: 20 30 (D1 quench safety)

- Two new C-D1 lines: (level control & cool-down/fill/warm-up)

- One line redundant (TD)

- Cold powering & DFX cooling mode flexible (returning or not to FF, D)

The construction of entirely new service modules should be considered.