mup capture: status and plans

Please tell me your status and plans, so that I can collect this info on this page and
assign names to certain tasks.

Gatchina status and plans

• chamber production and testing

The present design of the TPC Prototype is shown in Fig.1.
The main cathode of TPC is made from the Be-bronze wire of 300 mkm diameter
with 3 mm spacing . Distance between the main cathode and the anode plane of TPC is 8 cm.
All MWPC's have been tested separately in hydrogen (HV tests and noise).
All MWPC's (including the TPC plane) have the following geometry parameters:
- anode wire spacing      Sa = 4 mm,
- anode-cathode gap      H  = 3,5 mm,
- anode wire diameter         = 25 mkm,
- cathode wire spacing    Sc = 1mm,
- cathode wire diameter       = 50 mkm.
 -cathode strips have the size of Sst =0,5 mm x 8 = 4mm.
 

chamber	x(mm)	y(mm)	z(mm)	x(chan)	y(chan)	z(chan)
pc1	150	100			16
pc2	150	100		32
pc3	150		300			75
pc4	150		300	24
pc5	100		150			32
pc6	100		150	24
tpc an	150		300			75
tpc ca				32

explanation: x(mm) means wire running in x direction
                   x(chan) means channels giving x coordinates

The total number of readout channels is 310. The tpc an channels have two
thresholds, so the total number of tdc inputs is 310+75=385. This can be covered by
10 TDC400, having 480 tdc channels.
All MWPC's have been tested separately in hydrogen (HV tests and noise).

• pad chamber
• cross talk studies between MWPC and TPC
• gas purification/analysis

Alexei: Our chemists claim that they will have in a month the gas purification
and gas analysis systems operating on the level of 10(-8).
They suggest to bring to PSI the  new absorbers and demonstrate there
the operation of these systems (with the existing chromotograph).
• electronics
• number/properties readout channels

All cards of the amplifiers are now under testing by G.Petrov and A.Fetisov.
G.Petrov prepared a new test generator for simulation of the muon and
electron signals.
• base line restorer

The base line restorer now under tuning. More precise analysis of signals
form will be possible only with muon signals.
• entrance flange/window

The flange for fabrication of the new entrance window will be given to PNPI
workshop next week. Window diameter-40 mm.  Expected to be ready by Sept 23.
• plans

 The fully assembled TPC/MWPC Prototype will be under testing during period
from 23 September - 25 October. Shipment of the detector and the amplifiers to PSI is
planned for Nov 1, 1999.

---

DAQ preparation

• TDC400 production and testing at PSI

10 TDC400 produced. Testing of modules underway by Aart and Reinhard to be finished in Sept.
• DAQ hard and software development (Tom, Semyon?)
• get new MV2604 VME processor running with present program
• get fast data transfer MV2604 to disk (fast ethernet) and dlt (scsii) running
• expand program to 10 TDC400
• test program, data integrity and interface to offline program
• test, understand and improve dma speed
• CAEN tdc's ?

Analysis: status and plans

FADC analyses

• Maev & Maev ?

TDC analyses

• software development
• basic histogramming of time distributions (done)
• tpc tracking (in progress)
• analyses
• basic time fits with cuts of muon properties only (done)
• including tracking (in progress)
• specific analysis
• impurity sensitivity (planned, Peter...)
• search for Alvarez muons (planned, Peter...)
• clever accidental analysis (planned, Peter...)

to determine accidentals in high rate environment
• precision of vertex tracking (planned)
• sensitivity/resolution for diffusion measurement (planned)
• please add other work and plans (Claude, Gatchina)

Offline Analysis: preparation for run

• develop offline software to handle the 10 TDC400 data structure
• test new software with disk data produced by TDC400 test setup

General run preparations

• define run goals and run program
• define electronics and readout scheme
• organize missing electronic module
• scalers
• ecl fan/coincidences, if we want to select groups of channels
• we want to have good coverage with external scintillators, this should be

prepared (Claude, Peter).
• what do we know to define criteria for optimal electronics setup
• TPC e-threshold: as low as possible to maximize efficiency
• TPC mu-threshold:

can we go high enough to see impurities without delta ray background?
What is the optimal level?
• MWPC threshold:

compromise between efficiency and cross talk problem
• some medium range considerations from Berkeley research plan

Monte Carlo

• GEANT

We need a full GEANT MC, including event mixing at a later stage. Probably Berkeley can
do that, but not before this run.
• GARFIELD

If there are urgent GARFIELD studies required, please contact Peter.

Other loose ends

• plan a pulser scheme to test and calibrate timing behaviour during run (Peter, Genna)

Milestones

Lawrence Berkeley National Laboratory, MS 44B
1 Cyclotron Road, Berkeley, CA 94720
Tel (510) 486-5021 / Fax (510) 495-2111