Скачать презентацию Tevatron Halo Removal Dean Still 5 22 00 Quick Скачать презентацию Tevatron Halo Removal Dean Still 5 22 00 Quick

e19b2fa591e8a98fd2d38ee4532d753e.ppt

  • Количество слайдов: 30

Tevatron Halo Removal Dean Still 5/22/00 • Quick Collimator System Overview. • Some Observations Tevatron Halo Removal Dean Still 5/22/00 • Quick Collimator System Overview. • Some Observations and Study Results Related to Large Proton Backgrounds at CDF and D 0.

Collimator System Upgrades for CRII • Wanted to move to commercial hardware to replace Collimator System Upgrades for CRII • Wanted to move to commercial hardware to replace in house motion controls. – Collimators are faster and more reliable. – Each Collimator would be able to do feedback processing. • Wanted to move to a more automated system to reduce shot setup time and integrate with the Collider Sequencer. – Goal was to shot setup Halo Removal times of about 5 min. • Wanted to move to a 2 stage collimator Halo removal system. – Build 4 new targets and 8 new secondary collimators. • Wanted to employ a Proton removal system. – Build 1 new proton removal collimator and E 0 dogleg system. – Goal was to remove 1 E 13 in 100 secs.

Tevatron Collimator Layout Tevatron Collimator Layout

Collimator Groups Proton Set 1 D 49 target E 03 collimator F 172 collimator Collimator Groups Proton Set 1 D 49 target E 03 collimator F 172 collimator Proton Set 2 D 171 target D 173 collimator A 0 collimator Pbar Set 1 F 49 target F 48 collimator D 172 collimator Pbar set 2 F 173 target F 171 collimator E 02 collimator Green = Currently operational

Lattice Parameters for Collimator Locations for Collider II Lattice Parameters for Collimator Locations for Collider II

Collimator Controls Hardware Collimator Controls Hardware

Collider II 1. 5 m Collimator Collider II 1. 5 m Collimator

Collider II 1. 5 m Collimator Collider II 1. 5 m Collimator

Overview of New Software N*s X 0 Front End Xi OAC Application Fast Processing Overview of New Software N*s X 0 Front End Xi OAC Application Fast Processing : Global Orchestration: Configure/view, Initiate Process: Loss Monitor & Intensity Feedback. Employs states and collimator moving map. Can use sequencer initiate scraping.

Collimator Controls Block Diagram Collimator Controls Block Diagram

Collimator Moving Order for Halo Removal Collimator Moving Order for Halo Removal

Tunnel Layout of Collimator Local Loss Monitors used for proton losses Local Loss Monitors Tunnel Layout of Collimator Local Loss Monitors used for proton losses Local Loss Monitors used for pbar losses F 17 Spool F 171 Collimator F 172 Collimator Protons F 17 Kicker F 173 Target F 17 Dipole

Example of D 49 movement during Halo Removal Process Find the edge of the Example of D 49 movement during Halo Removal Process Find the edge of the beam Fine Scrape process: Scrapes. 4% of proton beam Before Halo removal CDF proton loss Initial Move No feedback After Halo Removal CDF proton loss

Proton & Pbar Targets moving during Halo Removal. Proton & Pbar Targets moving during Halo Removal.

2 nd Collimator loss Plot during Halo Removal. 2 nd Collimator loss Plot during Halo Removal.

Cold Magnet loss Plot during Halo Removal. Cold Magnet loss Plot during Halo Removal.

Summary of Halo Losses During Stores • D 0 proton Halo losses are not Summary of Halo Losses During Stores • D 0 proton Halo losses are not effected by scraping. • CDF and D 0 report high proton rates in pots in bay. • CDF reports large losses in muon chambers due to proton halo. • CDF proton halo losses develop “spikes” due to “DC” beam. • Losses that are attributed to power supply failures at CDF.

Studies Conducted to Understand Problems Studies Conducted to Understand Problems

F 172 Vertical Retraction Scan (with D 49 target in) F 172 Vertical Retraction Scan (with D 49 target in)

F 172 Horizontal Retraction Scan (with D 49 target in) F 172 Horizontal Retraction Scan (with D 49 target in)

E 03 Vertical Retraction Scan (with D 49 target in) E 03 Vertical Retraction Scan (with D 49 target in)

E 03 Horizontal Retraction Scan (with D 49 target in) E 03 Horizontal Retraction Scan (with D 49 target in)

Merit of Halo Removal Effiency for Beginning of Store CDF and D 0 Halo Merit of Halo Removal Effiency for Beginning of Store CDF and D 0 Halo losses before scraping. CDF and D 0 Halo Losses after scraping

Collimator Shielding Effiency for losses at End of Store All Collimators Retracted at this Collimator Shielding Effiency for losses at End of Store All Collimators Retracted at this point

End of Store Collimator Effiency End of Store Collimator Effiency

Studies Conducted to Understand Problems Studies Conducted to Understand Problems

Studies Conducted to Understand Problems Studies Conducted to Understand Problems

Studies Conducted to Understand Problems Studies Conducted to Understand Problems