Monthly LARP Collimator Video Meeting-10/11/2005 (32)

8:30:00 AM-10:00:00 AM

 
Agenda: This meeting is being held primarily to discuss the RC1 prototype CDR. That is, the Rotatable Collimator Prototype #1 Conceptual Design Report. This report is currently in draft form. CERN and SLAC need to determine its final form before it is subject to an external review. The eternal review is a prerequisite to spending the funds required to contrusct the prototype.
Summary: Before we release the document to a wider audience the CERN team suggested that we:
- Calculate table 3 for each of the 11 collimators in IR7
- As we do not have the other 10 collimators in our FLUKA model we will need to work with CERN to get the energy depositin (action: Lew)
- Calculate the "effective length" of each collimator, as it is distorted by the heat load during the 12min beam lifetime 10 second duration transient, using 100um as an effictive thickness.
- Redo calculations & Table three for 27 degree C water
There was a lot of discussion about the accident case:
- Calculate the pressure bump seen in the water system during the beam abort accident
- CERN has seen permanent deformation of the C-C prototype after the TT40 tests. This is due to "shock heating" where the jaw temperature rises to 70 deg. C in 100ns, a time so short that the material cannot thermally expand, and instead distorts. The phrase used was: "zone of plastification". This is now documented on the CERN LHC Collimator web site. I believe the numbers quoted at the meeting said that 300um of deformation are seen over a 3mm wide band along the length of the C-C jaw.
- Allesandro Bertarelli suggested that Eric do a "elasto-plastic transient analysis" to account for the shock waves. He is available for technical help if needed.
Guillaune DeMolaize reports that there is a new improved version of SixTrack. He will email it to Yunhai of Friday 10/14/05. Yunhai should use this version for any new calculations.

1 .) id=96  Thomas Markiewicz --  SLAC Secondary Collimator RC1 Prototype CDR  (90 min)

Summary: The prototype desgn, work flow and schedule is discussed.