TERTIARY COLLIMATORS: IP1IP5 MARS15 MODEL UPGRADE

1
TERTIARY COLLIMATORS IP1/IP5 MARS15 MODEL UPGRADE

• Conversion to LHC lattice ver. 6.5
• Update of layout, dimensions, magnetic field
  maps, beam screen in Q1, cylindrical D1-D2 pipe
• TAN standalone, with ZDC, with LHCf (if IP1)
• Implementation of collar shielding A and B, and
  TCT collimators TCL open and closed
• Upgrade of machine-detector interface (CMS beam
  pipe, blockhouse, its extension into the tunnel
  etc).
• Extension of the model into arcs (up to IP4IP6)
• Beam loss patterns from IP3/IP7 (Ralf Assmann),
  and beam-gas (with Mika Huhtinen)
• Recent developments of the MARS15 code

2
IP5 TCT TERTIARY COLLIMATORS MARS15 STUDIES

1. Outgoing beam TCTs are pretty radioactive
(especially if made of tungsten) and
interfere with the TOTEM first station XRP1 at
146 m. 2. Incoming beam preliminary results for
beam-gas are encouraging. 3. On September 30,
2005, Ralph Assmann provided beam loss patterns
from IP7 betatron cleaning for BEAM1 its
contribution at IP5 is negligible. 4. Desperately
waiting for BEAM1 (momentum) and especially for
BEAM2 (momentum and betatron) Ralph says we
will get it this month.