Post on 24-Feb-2016
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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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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)
13/5/2014
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
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