Status of the H2 beam line-

in view of Primary Ion run

Adrian Fabich, MEF-LE

13th May 2014

2 A. Fabich

Safety

Personal Protection Equipmentinside the green line (= beam zones + central corridor) Safety shoes Helmet

Specific precautions required for the primary ion run in early 2015 Interlock chain in SPS Bend limitations Increased shielding of H2 in EHN1

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3 A. Fabich

H2 operation

As experienced in previous runs

With a reasonable setup time we gain a lot in overall run efficiency

More efficient (cleaner) recording of events Higher rate of interesting events Less unnecessary data to be analysed (filtered) Less time for changes between energy swaps at a later stage

Liaison physicist: Adrian

13/5/2014

4 A. Fabich

Primary Ion Operation

The potential extraction of a proton beam (max. 3*1013) on a Primary Ion cycle to the SPS-NA must be excluded:

SPS interlock exclude extraction of an SPS beam with more than 2*1011 charges per

cycle. Two dedicated, redundant BCTs installed

Bend limitations: Procedural safety:

SPS protons extracted only >400 GeV Primary ions extracted only at 380 GeV (<400 GeV)

In Primary Ion operation the transfer dipoles are limited (HW) to 390 GeV.

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5 A. Fabich

H2 shielding

Achieve legal RP limits in corridors and barracks Also during accidental beam loss upstream of PPE152

Additional shielding (min. 80 cm concrete equivalent) PPE132 and 142: fully covered to protect personnel in corridor

and workshop PPE152: lateral shielding up to 2 m above first floor

Effort About 300 concrete blocks about 200 kChF project costs (incl. blocks, person power,

modifications of existing installations)

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6 A. Fabich

PPE132/142 shielding

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7 A. Fabich

PPE152 shielding

Only lateral No roof cover

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Central passage NA61 target

beam

beam

8 A. Fabich

Modifications to NA61

And some minor re-arrangements to the concrete block floor in the zone

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9 A. Fabich

Other EHN1 modifications

EHN1 clean-up during 2013 About 80 trucks of material removed

Wood, metal, unidentified left-overs …

New GAMMA IRRADIATION FACILITY Operational from Autumn 2014 No impact on H2 layout

Also foreseen: removal of target station T24 (H4)

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10 A. Fabich

Beam instrumentation

SBA instrumentation NOT in vacuum: 131 m: MWPC + Scintillator (retractable) 264 m: Trigger (retractable) 385 m: MWPC + Scintillator (retractable) 461 m: MWPC + Scintillator (retractable) 527 m: 2x XDWC (fix) + Scintillator (retractable)535 m: NA61 target

This equipment is mandatory - at least for setting up! Other BI like FISCs etc.

NA61 vacuum around S2/V0 On charge by NA61 Vacuum elements stored in zone Theoretically (by removing XDWC) the S2/V0 vacuum can be connected to the

SBA vacuum

13/5/2014