1. Tertiary Collimators in IP1/IP5: Progress Report
LARP Collaboration
Fermilab
Tertiary Collimators in IP1/IP5: Progress Report
Nikolai Mokhov, Fermilab
CERN/LARP Collimation Meeting
August 23, 2006

2. IP1/IP5 TCT Collimators - N.V. Mokhov
OUTLINE
IP1/IP5 MARS15 Extended Model
Beam-Gas and Betatron Cleaning
Radiation in Inner Triplet and TCTs
CERN/LARP Collimation, Aug. 23, 2006
IP1/IP5 TCT Collimators - N.V. Mokhov

3. IP1/IP5 MARS15 Extended Model
Machine, interface and related detector elements
in  550 m from IP1 and IP5: 3-D geometry,
materials, magnetic fields, tunnel and rock outside
(up to 12 m laterally).
Tungsten tertiary collimators TCTV and TCTH at
and m from IP, respectively,
aligned wrt BEAM2 coming to IP5 and BEAM1
coming to IP1.
First source: tails from betatron cleaning in IP7 –
files of proton hits in TCTs for BEAM1 and BEAM2
from Tom Weiler.
Second source: beam-gas interactions of BEAM2 at
0 to 550-m from IP5 using gas pressure map from
CERN colleagues.
MARS15 calculations: power density and dynamic
heat loads in inner triplet quads, absorbed and
residual doses in the entire region, and particle
fluxes at CMS and ATLAS.
Most calculations completed for IP5; started for IP1.
CERN/LARP Collimation, Aug. 23, 2006
IP1/IP5 TCT Collimators - N.V. Mokhov

4. IP1/IP5 TCT Collimators - N.V. Mokhov
TCTV and TCTH Models
Aspect ratio V:H = 1:12
CERN/LARP Collimation, Aug. 23, 2006
IP1/IP5 TCT Collimators - N.V. Mokhov

5. Betatron Cleaning: Hadron Fluxes in IR5
Total in TCT – TAN region
Charged hadrons at 0 to 150 m
CERN/LARP Collimation, Aug. 23, 2006
IP1/IP5 TCT Collimators - N.V. Mokhov

6. Betatron Cleaning: Radiation Loads in IR5
Peak power density in Q3 SC coils: 6.e-5 mW/g
Peak absorbed dose: a few kGy/yr
Peak residual dose: 7 mSv/hr
CERN/LARP Collimation, Aug. 23, 2006
IP1/IP5 TCT Collimators - N.V. Mokhov

7. Betatron Cleaning: Radiation Loads in TCT-TAN Region
Peak absorbed dose: 12 MGy/yr in jaws, 20 kGy/yr outside jaws
Peak residual dose: 8 mSv/hr on jaws, 0.1 mSv/hr around TCTs
CERN/LARP Collimation, Aug. 23, 2006
IP1/IP5 TCT Collimators - N.V. Mokhov

8. Beam-Gas Interactions in IR5
Driver for detector backgrounds at large radii
CERN/LARP Collimation, Aug. 23, 2006
IP1/IP5 TCT Collimators - N.V. Mokhov

9. Beam-Gas Induced Radiation Loads
Peak power density in SC coils: 3.e-5 mW/g (twice lower than from BC)
Peak power density in SC coils without TCTs: 1.5e-4 mW/g
Radiation levels in TCT-TAN about 20 times lower than from betatron cleaning
CERN/LARP Collimation, Aug. 23, 2006
IP1/IP5 TCT Collimators - N.V. Mokhov