Visitor’s path declassification for

LS2 and LS3?

(Summary of first discussion K. Barth with RP – H. Vincke)

Visitor path in UX25 Declassification from supervised area for LS2

(and LS3?)• Have the visitor path in UX25 declassified would allow to bring down

also visitor groups with an age limit of >= 12 (limit presently >=16 because of supervised area rules)• Access control (accounting of person) going down in UX25 remains

(imposed by fire/evacuation risk)• The start of the supervised area could be displaced from SX2/PAD

down to UX25 outside the safe area of PX24 under certain conditions.• If we want to keep the entire visitor path in UX25 (including access to

the low beta platform) only part of it will be in a declassified zone.• Idea is to have the entire UX25 path for visitor groups (>=16years) and

for visitors < 16 years only access to the part in the declassified zone.

Present ALICE Visitor path – SX2

Acces to CRs

ALICE VisitorCenter

Cooling Area

ALICE Buffer Zone

ALICE Runcontrol Center (ARC)

Coffee Room

WC

ALICE Workshop

In Non-supervised Zone

Supervised Zone

Alice Visitor Path – Present start of part in supervised area

Present ALICE Visitor path – UX25

In Non-supervised Zone

Supervised Zone

With proposed change of supervised area startALICE Visitor path – SX2

Acces to CRs

ALICE VisitorCenter

Cooling Area

ALICE Buffer Zone

ALICE Runcontrol Center (ARC)

Coffee Room

WC

ALICE Workshop

In Non-supervised Zone

Supervised Zone

In Non-supervised Zone

Supervised Zone

With proposed change of supervised area startALICE Visitor path – SX2

Conditions / Needs to change supervised area

• The supervised area has to be limited/closed. Before this was assured via the PAD/MAD. To change start would mean in UX25 to put fences and doors (with card reader and IMPACT controlled access point).-> detailed study needed• Modification of start of stairs (I-side) to allow fencing of the area in

level 0 around the cooling plants. -> detailed study needed• Hand/feet + material radiation monitors must be moved from PX24

top level to level 0 inside safe zone to be close to entry to the supervised zone.• Materials to come out of the supervised area must be measured and

if active they must be transported via the crane to top level PX24 buffer zone.

Example of fencing in LHCb visitor area

Example of fencing in LHCb visitor area

Example of fencing in LHCb visitor area