2003 test beam with 25 ns bunched muons Period: 19 May-23 May: Flat top beam 24 May-02 June: 25ns beam unless changes due to problems at the PS. Purpose: test of a MB3 full chamber with minicrate, TRIGGER electronics. Data taking program & strategy: see Zotto Where: moved from X5 (West Area) to H6 (North Area): more space available and main beam user

Beam period

PS problem NEWS (4-Apr-2003, 14:35):  Second PS spare magnet successfully tested After the failure of two PS bending magnets early last week, both spare magnets have been successfully tested now. The first spare magnet was already tested last week, the second PS spare magnet has been successfully tested this week and is back at the PS. The vacuum chamber is being re-welded inside today. So far everything is on schedule and the new SPS physics starting dates for the 25ns running period (May 19) and the long fixed target proton run (Jun 13) are not in danger.

H6 area beam line barrack 447 10 m

Chamber MB3 On Padova transportation tool: Phi wires vertical with wheels for rotation around the vertical axis MB1 minicrate fully equipped Water cooling Gas, HV, LV standard Trasportation & installation: presumably week of 12 May

People DAQ (from PD and LNL): from installation to end BO: experts of SC, TSM, … always, + other 2 PD: experts of BTI and Traco always, experts of monitor, + other 2 2-3 persons from other labs (To, Madrid, Aachen) from 24 May at least

Beam structure From Emmanuel.Tsesmelis@cern.ch Tue Apr 8 17:33:56 2003 Date: Tue, 8 Apr 2003 17:26:05 +0200 (CEST) Subject: TSTB NEWS 030408 - Beam Parameters for 25 ns SPS Run Dear Colleagues, in Period P1A of the 2003 SPS proton run, LHC-type beams with a 25 ns bunch spacing will available in the West and North Area secondary beamlines. The conditions will be similar to those available during the previous such run in 2001 and are given below: o 400 GeV beam energy o 16.8 s cycle length o 2.7 s Slow Extraction duration o 48 bunches with 25 ns spacing between bunches --> 48 * 25 ns = 1200 ns bunch train length with 1 bunch train per 23 microsecs o The bunch length was measured in 2001 to be 2.3 ns at the base. Due to radiation safety limits, there are restrictions on the maximum number of particles that can be sent to the experimental areas. With the limit of 10^6 protons per spill in the West Area zones, the average number of protons would be 0.18 p/bunch for a 2.7 s Slow Extraction. This limit is a few times 10^6 protons per spill in the North Area with the corresponding increase in the number of protons per spill. Collimation may be used to tune the intensity in the secondary zones. Earlier measurements at the SPS for the conditions at the West Area show that the bunch population with the 2.7 s flat-top are similar to those expected at the LHC. Timing signals from the accelerator will be available in the counting rooms of the experiments. Both the 40 MHz machine clock from the RF Faraday Cage and the 43 kHz SPS orbit signal will be distributed as in the past via the TTC system using optical fibre transmitters and receivers developed by RD12. Best regards, Emmanuel Tsesmelis

Beam structure