Dear Emmanuel,
here I summarise the COMPASS (NA58) beam time requests for 
the X5 testbeam for 1998. In total I collected requests for
36 weeks of beam time from our various detectors groups.
I assume that we shall be able to aways perform measurements
for two devices in parallel, typically a tracker and a 
calorimeter. This results in an request of 

             18 weeks in total for X5. 

This includes the continuation of tests presently performed 
in the M2 beam, since the hall 888 we be refurbished in 1998.
If this refurbishing proceeds well and would allow beam in 
888 again e.g. in August, we certainly would like to make
use of it. Many properties of the M2 beam make an extrapolation
from results obtained in other beam line difficult and 
unreliable. We therefore ask for
 
              5 weeks in M2 from August on

if feasible. Alternatively some of the tracker tests could be 
performed e.g. in the PS t9 area (micromegas, MWPC,...).
Both, M2 and t9 time, would take some pressure from X5.

I am aware that the total SPS proton operation only amounts 
to about 25 weeks. We'll have to discuss the options.

With best regards,

Gerhard Mallot
(PPE NA58)






The COMPASS equipment we want to test is

Equipment         time       institute(s)           comments
-----------------------------------------------------------------------------------
MWPCs             3 weeks    Dubna/Torino           refurbishing of existing chambers
SciFi             2 weeks    Erlangen/Bonn          beam tracking
Mini Drift tubes  5 weeks    Dubna                  tracking muon filter 1
MSGC / Gem        3 weeks    Heidelberg             small area tracking
Josephson Pixel   2 weeks    Bern                   vertex detector
ECAL1, ECAL2      4 weeks    IHEP                   EM Calorimeterrs
HCAL1             3 weeks    Dubna                  hadronic Calorimeter 1
HCAL2             3 weeks    IHEP                   hadronic Calorimeter 2
Drift tubes       3 weeks    IHEP                   tracking muon filter 2
Micromegas, etc.  5 weeks    Saclay                 small area tracking
Straws            3 weeks    Dubna,Freiburg,Munich  large area tracking
-----------------------------------------------------------------------------------
                 36 weeks