1 / 13

Beam Position Chamber Alignment on 2006-2007 Data Using Positron Beam" -

This study by M. Kapishin and V. Palichik at JINR, Dubna on June 25, 2007, focuses on aligning Beam Position Chamber (BPC) to Central Jet Chamber (CJC) using specific selection conditions and analytical techniques. The selection criteria include variables like Q2, ESPACAL, E-pz, Zvertex, and momentum criteria. The study emphasizes minimizing deviations in various parameters like dPhi, dX, dY, dZ, and dTheta between BPC and CJC through detailed analyses. Conclusions suggest successful alignment strategies to enhance data accuracy. -

leigh
Download Presentation

Beam Position Chamber Alignment on 2006-2007 Data Using Positron Beam" -

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. BPC to CJC Alignment on 2006-2007 data with Positron Beam M.Kapishin, V.Palichik JINR, Dubna June 25, 2007

  2. Selection Conditions (1) HAT Selection: 2 < Q2 < 100 GeV2 12 < ESPACAL< 35 GeV 40 < E – pz < 80 GeV | Zvertex | < 28 cm Else we require sigma(Zvertex) < 2 cm

  3. Selection Conditions (2) Spacal Cluster conditions: cluster radius < 4 cm Spacal – BPC and Spacal – CJC distance on Z(Spacal) less than 6 cm DTRA CJC track: momentum p > Pt > 0.4 GeV N(CJC hits) > 13 10 GeV, Ep = 920 GeV 9 GeV, Ep = 460 GeV

  4. Selection Conditions (3), SW (BST- Vertex ) – distance < 0.5 cm on Z vertex (BST- Spacal ) – distance < 3 cm on Z spacal SW: h1oo 3.0.12 for 2006 data h1oo 3.0.13 for 2007 data

  5. dPhi(BPC-CJC) shift = P1 – mean value of Gaussian

  6. dXY(BPC-CJC) mean values of Gauss < ~ 0.1 mm

  7. dTheta & dZ (BPC-CJC) dZ mean values of Gauss < 1 mm after BPC moving out from vertex by 2.5 – 3 mm

  8. dTheta(BPC-CJC) vs Phi fit by P0 + P1 sin(Phi +P2 )* *) see D.Derkach & J.Kretzschmar, WLAN Meet. 23.IV.07

  9. Tuned dTheta(BPC-CJC) vs Phi After lower&upper BPC shifts on dX = ZBPC P1sinP2 < ~ 1 mm dY = ZBPC P1 cos P2 < ~ 1 mm P0 = ~ 0 dZ = 0.0

  10. dZ(BPC-BST) 0 mm shift for y > 0 6 mm shift for y < 0

  11. dZspacal on BST-tracks 4 mm shift 5 mm shift

  12. dZ(SPACAL-CJC) 3 mm shift for y < 0 -2 mm shift for y > 0

  13. Conclusions BPC alignment of 2 steps: • minimize dPhi, dX, dY, dZ (BPC-CJC) • dTheta(BPC-CJC) vs Phi distributions are fitted by P0 + P1 sin(Phi +P2 ) for lower/upper BPC parts separately max dTheta(BPC-CJC) deviations vs Phi are in 0.5 mrad limits

More Related