CEPC Physics and detector regular meeting
Wednesday, May 3, 2017 from 15:00 to 18:00 (Asia/Shanghai) at IHEP ( A415 )
1. Overview of CDR (by Joao)
Joao gave an overall introduction of CDR preparation.
Some comments about the slides:
a. For the CDR outline in Slide 7, the structure of Chapter 4.1, tracking concept, isn’t accurate enough.
TPC also has silicon tracking that was not being explicitly mentioned, but that is somewhat different from the silicon tracking for the other options. So it’s better to re-write the title for this chapter. Also people are concerned that no one is working on the silicon tracking for the TPC option, and it is not clear who will follow up on that.
b. As two kinds of magnet fields will be involved in CDR, some people proposed that we should split completely the description of the two concepts, but others argued that it is more reasonable to combine the common contents of the two concepts, and just mention the different parts separately.
c. For Chapter 9, the outline is needed, and it’s better to change the title to MDI .
2. Plans for the TPC tracker CDR (by Huirong)
Huirong showed the draft of the outline of TPC tracker CDR, and introduced the manpower and cooperation for CDR.
Some comments for the slides:
a. In outline, the 1.1.1 Physics requirement for Higgs and Z, will only mention the information related to TPC, not including the requirement for other parts of detector.
b. Who will be responsible for CDR writing? Huirong Qi and Zhi Deng will try to focus on it.
c. Some discussion and meeting are needed for the description of silicon tracker in CDR. The description should meet the physics requirements.
3. Outline for Calorimeter CDR
Some comments for the slides:
a. As we know, there are several options for the design of calorimeter, so the CDR should describe clearly the reason for choosing these options. It should connect to the physics requirements and show the performance of each technology and make some comparison.
b. CDR should also involve future R&D.
c. Contact with Simulation group for the optimization.
4. Magnet preparation for CDR (by Zian)
comments:
a. Considering the field homogeneity, people should contact the TPC group
b. So far, people have just lowered the current to obtain a 3 T magnet. We should consider the possibility of using less superconducting layers and estimate the amount of material that a 3 T solenoid would have.
c. The size of cavern due to the cooling system should be discussed.