Temperature gradient in the TPC and the tracking
- Slides: 16
Temperature gradient in the TPC and the tracking performance TPC meeting, Copenhagen, September 2002 Marek. Kowalski@ifj. edu. pl
Drift velocity is sensitive to the temperature For E = 400 V/cm , Vdrift/Vdrift = 0. 34% per deg. Assuming the temperature gradient of 0. 1 deg one gets: Ldrift = 250 cm 6/10/2021 Z = 850 m Marek. Kowalski@ifj. edu. pl
1. No real T(R, , Z) dependence available • 2 simple models assumed for T (R), – 0. 2 < < +0. 2 • No temperature gradient in Z • No temperature gradient in 2. Enhanced transverse momentum – high Pt tracks (flat distribution between 2 and 5 Ge. V/c) added 3. 6/10/2021 Marek. Kowalski@ifj. edu. pl
Drift velocity calibration: § at inner radius - wrong angle, good the first point § at outer radius - wrong angle and the first point The above remarks concern the matching to the ITS, for the TRD the situation is reversed! 6/10/2021 Marek. Kowalski@ifj. edu. pl
Linear vs. quadratic model, Vd calibration at the inner radius Linear model 6/10/2021 Quadratic model Marek. Kowalski@ifj. edu. pl
Linear vs. quadratic model, Vd calibration at the inner radius Linear model 6/10/2021 Quadratic model Marek. Kowalski@ifj. edu. pl
Linear vs. quadratic model, Vd calibration at the outer radius Linear model 6/10/2021 Quadratic model Marek. Kowalski@ifj. edu. pl
Linear vs. quadratic model, Vd calibration at the outer radius Linear model 6/10/2021 Quadratic model Marek. Kowalski@ifj. edu. pl
Pt resolution, Vd calibration at the inner radius 6/10/2021 Marek. Kowalski@ifj. edu. pl
Pt resolution, Vd calibration at the outer radius 6/10/2021 Marek. Kowalski@ifj. edu. pl
resolution, Vd calibration at the inner radius 6/10/2021 Marek. Kowalski@ifj. edu. pl
resolution, Vd calibration at the outer radius 6/10/2021 Marek. Kowalski@ifj. edu. pl
Conclusion: It seems that the Kalman tracking can deal with the distortions caused by the temperature gradient of 0. 1 o To do list: 1. 2. 3. Realistic temperature map in the drift volume Linear corrections applied to nonlinear distortions Is the d. E/dx affected ? (removed points on a track) 6/10/2021 Marek. Kowalski@ifj. edu. pl
Inner thermal screen in the TPC Placed at the conical parts of the inner containment vessel. • 0. 5 mm of Al. • 1 mm of H 20 • 0. 5 mm of Al Does it increase the space charge in the drift volume ? Marek. Kowalski@ifj. edu. pl
79 < R < 109 cm 6/10/2021 Marek. Kowalski@ifj. edu. pl
228 < R < 258 cm 6/10/2021 Marek. Kowalski@ifj. edu. pl