# Presentation: 219028

## DS Session Agenda

- DS working group – BNL, LBNL and Fermilab
- The goals of the discussion are:
- DS results in FY05 and plan for FY06-07
- Preparation to LARP review

## FY2005 directions and tasks

- In FY2005 we identified three key directions and five tasks for LARP Magnet Design Studies:
- 2.1 Design Studies
- 2.1.1 ***Quadrupole***
- 2.1.1.1 Shell & Block design comparison
- 2.1.1.2 Shell mechanical design study
- 2.1.2 ***Separation dipole***
- 2.1.2.1 D1 design
- 2.1.2.2 D1 cooling study
- 2.1.3 ***Cryogenics***
- 2.1.3.1 IR cryogenics study
- The DS work plan was corrected in the middle of the year taking into account new LARP magnet R&D priorities

## DS Mission and FY06-07 Goals

- Model magnet conceptual design studies and analysis
- generation or evaluation of model magnet proposals including magnet parameters, design concept, cost, schedule
- preparation of key decisions
- IR magnet conceptual design studies
- magnet parameter space, radiation heat depositions, dose and life-time, heat transfer and IR cryogenics.
- Interface with LARP AP group
- FY2006-2007 DS work plan is focused on model magnet R&D support, preparation of critical decisions in FY2007
- Conceptual design and parameters of ultimate gradient quadrupole (HQ)
- Mechanical design and parameters of long quadropole (LQ)

## LARP Plan: FY05-09

## FY2006 DS WBS

- 	 In FY2006 DS work will be performed in 2 directions and will have 5 tasks:
**2.1.2 Cryogenics**
- 2.1.2.1 Radiation Study – N. Mokhov (FNAL)
- 2.1.2.2 IR Cryogenics and Heat Transfer – R. Rabehl (FNAL)
**2.1.3 IR Magnets**
- 2.1.3.1 HQ Design and Analysis – G. Sabbi (LBNL)
- 2.1.3.2 LQ Design and Analysis – G. Ambrosio (FNAL)
- 2.1.3.3 IR Magnet Analysis – R. Gupta (BNL)

## Block-type IRQ (Ferracin)

- Choice of luminosity upgrade scenario                     (***LHC Project Report*** 626 (2002))
-  Beam envelope – coil aperture
-  Magnetic design
-  Mechanical design
- Topics to be furthers studied
- Magnet physical and dynamic aperture
- Radiation heat depositions

## D1 Open Midplane Dipole Design (Gupta/Mokhov) 

** ****The purpose of this task was to study the open midplane dipole design for “dipole first” optics**
** ****The task was terminated in middle of FY2005 to direct most of the magnet R&D funding to quad program**
** ****In the remaining term, a summary was written and presented as a paper in PAC2005 **
** ****Optimization of Open Midplane Dipole Design for LHC IR Upgrade – R. Gupta, et, al.**
** ****It may be too early to determine from machine physics point of view (prior to any LHC experience), whether for high luminosity operation “dipole first” should be a preferred option or “quadrupole first”**
**  ****Therefore, some modest investigations on the magnetic design of this and other non-conventional magnets will continue; however, under some AP task. **

## IR Magnet Study Task (Gupta)

_**This task will have the following components:**_**	****	**
** ****IRQ Parameter Space Study **
** **Present acceptable values of gradient/aperture combination to AP group that can be used in optimizing future IR upgrade lattice.
** ****Field Quality Analysis / Error Tables **
-  Based on model calculations, and on the construction and measurements of Nb3Sn magnets built for LARP and other projects, create error tables for Nb3Sn magnets (both dipole and quad). **	**
** ****Complete Remaining Work on Some Previous Tasks**
** **Comparison between cosine theta and race-track quad designs.
-  Generic design study of 110-mm aperture, G>200 T/m quad.

**This group will be responsible for communicating with AP group on various issues related to general magnetic design and field quality.**

## Radiation study: FY06 PLANS (Mokhov)

- Refine IR heat deposition dependence on TAS, inner absorber and low-Z coil insertion parameters. If possible, compare cos-theta and block-coil racetrack quads.
- Refine peak absorbed dose to peak power density correspondence. Justify R&D beam tests in LHC-like environment at Fermilab (with BNL, LBNL and MSU involved).
- Perform energy deposition simulations on D0 dipole (possibly looking at deleterious effects on CMS/ATLAS).
- Perform studies needed to justify limits on dynamic heat loads on cryogenics.
*Nicolai needs help*

## IR Cryogenics Studies – FY05 Results (Rabehl)

- Temperature profile vs. heat load scaling of the existing LHC IR cryo model was completed and documented.
- Limitations in both the IR cryo system and the LHC cryo system are identified.
- Pressurized He II system
- Magnet heat exchanger
- Location and capacity of cold compressors

## IR Cryo Studies – FY06 Milestones (Rabehl)

- Q1:  Establish and document a target temperature profile for an upgraded IR.
- Study possible LHC cryo system modifications to determine how much additional temperature drop can be gained for the IR.
- Based on these results, arrive at a design heat load.  Iteration with magnet designers and analysts may be necessary.
- Portion the temperature drop appropriately within the IR in preparation for parametric studies.
- Q2: IR quad heat transfer parametric studies using the target temperature profile, including:
- Heat exchanger design
- Pipe sizing
- Q3:  IR quad cryostat quench protection studies
- 		IR triplet heat transfer parametric studies
- Q4:  IR triplet quench protection studies
- Collaboration with CERN

## HQ: Goals & Milestones (Sabbi)

- 1. Develop HQ design and R&D plan in preparation for model fabrication:
- 	- Magnetic, mechanical and quench analysis
- 	- R&D issues, magnet parameters and features
- 2. Provide input to LHC IR quad conceptual design and analysis:
- - Optics, IR layout, radiation deposition, cryogenics studies

## LQ: Goal, inputs and outputs (Ambrosio)

- GOAL: develop design of Long Quadrupole (LQ01 ...)
- 4 m long,  90 mm aperture, G > 200 T/m,
* **the baseline is the design of the TQ*
* **TQC or TQS? It will depend on test performance and analysis *
- INPUT:
- TQs fabrication and test performance
- LRs fabrication and test performance
- SQ02 test performance
- Conductor R&D
- Specific issues (coil HT, quench protection, ...)
- OUTPUT:
- Coil design (quench protection included)
- Coil fabrication technology and tooling
- Magnet mechanical structure