Q & A for S214 Main Experiment.

-- Physics and Experimental conditions --

1. The purpose of this experiment is ?

   spectroscopy of eta meson bound states to 11B.

2. What binding energy and width are  expected ?

   B_eta = about 35 MeV
   Gamma_eta = about 48 MeV 

3. What resolution do we require?

   about 10 MeV.
   With 3.5 cm/% dispersion, 1 cm -> about 13 MeV

4. What cross section ?

   1 nb/sr/MeV at peak region.
   25 nb/sr in total.

5. Which beam ?

   deuteron

6. Which energy ?

   Td = 3420.379 MeV

7. Which intensity ?

   5 x 10^11/s, 3 sec repetition cycle.

8. reaction ?

   12C(d, 3He)

8. Expected yield ?

   (25 x 10^-9 x 10^-24) cm^2 x (5 x 10^11)/s x 1 gramm/cm^2 /12 x 6.02 x 10^23
   x (40 x 30 x 10^-6) sr = 1.5/spill.
   in peak region + pedestal 3He should give about 1-2/spill.

9. Background proton rate?
   
   about 100 MHz during spill

10. How wide the binding energy spectrum should cover ?

   +- 100 MeV in central region.


11. How much is the expected yield for p(d,3He)  calibration ?


12. How long is needed to evaporate half of the proton in the PE target ?



-- Target --

1. What target for production runs?

   12C 

2. Which thickness?

   0.5 or 1 gram/cm2 ( 4 mm strip)
  
3.  Which numbers ?

   13 and 16.

4. What target for calibration runs?

   PE

5. Which thickness?

   0.5, 1 or 1.5 gram/cm2
 
6. which numbers?

   47, 49 and 71

-- FRS --

1. What is the central momentum of the 3He ?

   4955.56588 MeV

2. What is the dispersion at S2 ?

   about 3.5 cm/% but precisely ?

3. What is the flight time between S2-S4

   ?	   for proton
   ?	   for 3He

4. What is the typical time resolution of the Torch's?

   ? ns for S2
   ? ns for S4

5. What is the optics setting file name ?

   ?

6. What is the virtual accelerator number?

   ?

7. Which energy of deuteron can go through the FRS in the production setting ?

   ?

8. To let the deuteron beam go through the FRS without changing the energy 
   from the production setting, how much do we need to scale the FRS ?
   
   ? for TA-S2
   ? for S2-S4

9. What do we have in the target area?

   ?

10. What do we have in the S1 ?

   ?

11. what do we have in the S2 ?

   ?

12. what do we have in the S3 ?

   ?

13. what do we have in the S4 ?

   ?

-- Detectors --

- Torch -

1. Where can I find the HV setting for the Torch-1 and -2 ?

   ? for low gain mode
   ? for hi gain mode

2. What is the expected pulse height of the PMT for single photon ?

   ? for Torch-1
   ? for Torch-2

3. How many photons do we expecte with 3He ?

   ? for Torch-1
   ? for Torch-2

4. Onto how many PMTs are the photons distributed ?

   ? for Torch-1
   ? for Torch-2

5. Where will be the proper threshold level to discriminate 3He

   ? for Torch-1-sum
   ? for Torch-2-sum
   ? for Torch-1-individual
   ? for Torch-2-individual

6. How to measure the cross section ?

   ?

7. What is the thickness of the radiators ?

   ? for S2 Torch
   ? for S4 Torch

8. Gate width for Torch qdc is

   ? ns

9. Gate preceding time for pre-trigger of Torch qdc is 

   ? ns

10. Gate preceding time for LeCroy 4300B QDC is

   ? ns

11. Gate preceding time for LeCroy 2249A QDc is

   ? ns

12. Torch2 single photon pulse height is

   ? pC

13. What are the QDC resolution

   ? pC/ch for 4300B
   ? pC/ch for 2249A

14. How the Torch analog signals are divided ?

   ?

- DC -

7. What is the DC HV ?

   ? for Cathode 
   ? for Potential

8. What is the DC threshold ?

   ? in FRS
   ? in Huette

9. What is the proton rejection factor ?

   ?

10. What is the current limits?

    ? for Cathode
    ? for Potential


- FRS standard -

1. MWPC two stage operation HV ?

	A -> ? Volt
	T -> ? Volt
	G -> ? Volt

2. Seetram condition is

	?

3. Current grid voltage is 

	? volt

-- DAQ --

1. What is the trigger condition ?

2. Which machine to log on ?

    collector	builder	Rem-Sv	Trig	Analyzer	what
 ----------------------------------------------------------------------------
  DAQ0: R3-8	X86-11	lxg1015	?	?		FRS
  DAQ1: R3-8	X86-11	lxg1015	1	kcpc41		Torch
  DAQ2: R3-19	X86-14	lxg1018	2	kcpc41		Torch+DC

3. Do you know the passwords?

   ?