Download 1 - USLARP

Task Progress reports
October 2006
1. HQ - GianLuca Sabbi, November 13, 2006.
Following the HQ videoconference at the end of September, work is proceeding on the following
two topics:
 Magnetic analysis of a "phase 1" HQ that would use TQ coils for the inner double-layer and the
"HQ2" design for the outer layer. The goal is to provide a complete set of performance
parameters for this case, similar to what was done for HQ1 and HQ2 (ASC-06 paper).
 Design concepts for a mechanical support structure for HQ2, taking into account the issue of
coil alignment.
2. LQ - Giorgio Ambrosio, November 13, 2006
The work was focused on LQ quench protection analysis and preparation a plan of LQ mechanical
design analysis and selection.
Quench protection:
 Extended parametric analysis of LQ quench protection for 4.2K operation.
 Performed quench protection analysis for LQ operating at short sample limit at 1.9K
 Presented and discussed status and plan of LQ DS task at LARP collaboration meeting and at
QP working group video-meeting.
 The fine tuning of quench protection parameters is still in progress: developed plan of QPrelated measurement during test of TQS01b
Mechanical design analysis and selection:
 Presented and discussed the plan at LARP collaboration meeting
 the final plan including inputs after the collaboration meeting is under development
Budget:
 Spent about 10% of budget because of large amount of work to complete the quench protection
study
3. IR magnets - Peter Wanderer, November 13, 2006.
Field quality analysis and error tables for Nb3Sn IRQ (Vadim Kashikhin). In the past month we
were working on the correlation of magnetic measurement results in TQC01 with the coil size
deviations. A ROXIE model allowing azimuthal block displacements was built and the
displacements were optimized to match the measured field quality. The difference between
measured and calculated harmonics was smaller than the measurement accuracy for all normal and
skew harmonics except a7 (that can be explained by some local geometry deviation). The calculated
coil cross-section is being compared with the coil mechanical measurements.
D2 Design Study (Vadim Kashikhin). Initial ideas for a conceptual design were discussed and a plan
for the design studies developed.
New magnet initiatives (Peter Wanderer). At the CARE-HHH meeting LUMI06 in Valencia,
October 16-20, several new options for increasing the LHC luminosity were discussed. The options
discussed do not include the option that is now the main focus of LARP magnet work, replacement
of the IR quads with higher-performing Nb3Sn quads. The options fell into two classes:
improvements to the LHC, and improvements to the injector chain. One of the improvements to the
LHC was to install “slim magnets” (either a quadrupole, Q0, or a dipole, D0) inside ATLAS and
CMS. The BNL “direct wind” technology could be used to make a quadrupole that would meet the
gradient and aperture values given at the workshop. This technology has been used to make IR
magnets now in use at HERA and delivered to BEPC. Possible work on this option will be
discussed with CERN staff at the CARE annual meeting in Frascati in mid-November.
One of the options for improving the injector chain is PS2, a version of the PS that has twice the
circumference. The fast cycling magnets for PS2 could be resistive, or superconducting. This is the
injector chain upgrade option that the CERN staff at the conference seemed most interested in
pursuing. Fermilab could possibly contribute to studies on PS2 magnets by simulating eddy current
heating using existing software. BNL could possibly contribute via its experience in making a
successful 4 T/s superconducting model dipole for GSI. Possible work on these options will be
discussed with CERN staff at the CARE annual meeting in Frascati in mid-November.
4. Radiation studies - Nikolai Mokhov, November 14, 2006
Detailed MARS15 energy deposition calculations have been performed for the dipole-first model
with the D1 (open-midplane) and D2 (dual bore) dipoles followed by a quadrupole (dual bore)
triplet. It was found in preliminary studies last month that the power density in the D2 and quad SC
coils is above the quench limits at the LARP design luminosity of 1035. Careful optimization has
been performed and a set of absorbers proposed (TAS, TAS2, TAN0 and TAS3) that make the peak
power density in all the SC coils below 1 mW/g - the quench limit with the required safety margin.
A series of energy deposition studies in the quad-first Nb3Sn IRQ with a tungsten-based inner
absorber has been performed for three distances of the triplet to IP.
Building of the MARS geometry and magnetic field descriptions for the block-type coil quadrupole
was started.
The results of radiation studies performed in FY2006 have been presented and discussed at the
CARE-HHH meeting LUMI’2006 in Valencia, October 16-20, 2006.
5. Cryogenics and heat transfer - Roger Rabehl, November 14, 2006
Progress for October
BNL: Documented the evaporator heat exchanger conceptual design and added it to the LARP
Documents Database.
BNL & FNAL: Generated (FNAL, BNL) and presented (BNL) a PowerPoint presentation for the
LARP Collaboration Meeting in Port Jefferson, NY.
FNAL: Began quench pressure calculations for the LARP quadrupole.
Plans for November
BNL: Look at cryostat integration issues for the evaporator HX.
FNAL: Attend the Review on the Thermal Stability of Accelerator Superconducting Magnets
(CERN Internal Review) on November 14, gather information and perhaps establish collaboration.
FNAL: Continue quench pressure calculations and documentation.